| | 102 | Author
| Andreas Ansorge, DavidJ. Brauer, Hans Bürger, F. Rank Dörrenbach, Burkhard Krum, G. Ottfried Pawelke | Requires cookie* | | | Title
| Complexes of (CF3)3B with Sterically Crowded Amines. Unexpected Side Products from the Trifluoromethylation of Cl2BN(f-Bu)(Bz). Crystal and Molecular Structures of (CF3)3BN H(CH 2)6, H O (CF3)2BCH(Ph)NH(f-Bu)(Bz) and Ph(CF3)2BCHN(f-Bu)(Bz)  | | | | Abstract
| Trifluoromethylation o f C12B N (C H 2)6, Cl2B(tmp), tmp = 2,2,6,6-tetramethylpiperidino, and CLBN(r-Bu)(Bz) with three equivalents o f C F3Br/P(NEt2)3 yields the amine complexes (C F 3)3B N H (C H 2)6 (1), (C F 3)3B • N H 2CM e2(CH 2)2CH C M e2 (2) and (C F 3)3B N H 2(Bz) (3). The preparation o f 3 was accompanied by formation o f three unexpected trifluoro-methylboron derivatives X (C F 3)2BCH(Ph)NH(r-Bu)(Bz) (D), X = Br (4), Cl (5), and (Ph)(C F3)2BCH N(/-Bu)(Bz) (6), the latter being formed from 4 by HBr elim ination and rear rangement. Reaction o f 4 with H 20 , EtOH, H C O N M e2 and M e3SnH yielded D, X = OH (7), EtO (8), HCOO (9), and (Ph)(CF3)2BCH2N H (/-Bu)(Bz) (10), respectively. The structures o f 1, 6 and 7 have been determined by X-ray diffraction analysis. | | | |
Reference
| Z. Naturforsch. 47b, 772—7 (1992); received November 6 1991 | | | |
Published
| 1992 | | | |
Keywords
| Trifluoromethylation, Borane-Amine Complexes, X-Ray | | | |
Similar Items
| Find | | | DEBUG INFO
| | | | | TEI-XML for
| default:Reihe_B/47/ZNB-1992-47b-0772.pdf | | | | Identifier
| ZNB-1992-47b-0772 | | | | Volume
| 47 | |
| 103 | Author
| Dieter Sellmann+, MarcusH. Annakam, Falk Knoch, M. Atthias, Moll | Requires cookie* | | | Title
| Übergangsmetallkomplexe mit Schwefelliganden, XCII*. Oxidation von Thiolat-Amin-zu Schiffbase-Eisen(II) | | | | Abstract
| Komplexen. Röntgenstrukturanalyse und Reaktivität von [Fe('N2S2')]2 (N2S2'2" = Glyoxal-bis(2 -mercaptoanil)(2 -)) Transition M etal Complexes with Sulfur Ligands, XCII*. Oxidation o f Thiolate Amine to Schiff Base Iron(II) Complexes. X-Ray Structure Analysis and Reactivity of [Fe('N2S2')]2 ('N 2S2'2_ = Glyoxal-bis(2-mercaptoanil)(2-)) Oxidation o f [Fe(CO)2('N 2H2S2')] (1) ('N 2H2S2'2_ = l,2-ethanediam ine-N ,N '-bis(2-benzene-thiolate)(2—)) gave insoluble [Fe('N2S2')]2 (2) ('N2S2'2_ = glyoxal-bis(2-m ercaptoanil)(2-)). Dinuclear, thiolato-bridged 2 was characterized by single crystal X-ray structure analysis. It does not react with CO or H 2, but yields bis or mono adducts with PR 3 (R = M e, rc-Bu, Cy). | | | |
Reference
| Z. Naturforsch. 47b, 1545—1550 (1992); eingegangen am 17. April 1992 | | | |
Published
| 1992 | | | |
Keywords
| Thiolate Am ine, Iron(II) Complexes, Oxidation, X-Ray | | | |
Similar Items
| Find | | | DEBUG INFO
| | | | | TEI-XML for
| default:Reihe_B/47/ZNB-1992-47b-1545.pdf | | | | Identifier
| ZNB-1992-47b-1545 | | | | Volume
| 47 | |
| 104 | Author
| RostislavD. Lampeka, Zam Ira, D. Uzakbergenova, VictorV. Skopenko | Requires cookie* | | | Title
| Spectroscopic and X-Ray Investigation of Cobalt(III) Complexes with 2-Oximinocarboxylic Acids | | | | Abstract
| Mixed complexes of Co(III) with 2-oximinopropionic (H 2A) or 2-oximino-3-phenylpropionic (H 2B) acid and different amine (imidazole, benzimidazole, pyridine, yS-picoline, y-picoline) are reported. Characterization of the complexes was based upon ele mental analysis, conductivity and JR, 'H N M R, and electronic absorption spectra, and X-ray diffraction analysis. The organic ligands behave as 0 ,N donors via the carboxyl oxygen and the oxime nitrogen atoms. A trans-octahedral structure has been assigned to the bis(2-oximino-carboxylato)bis(am ine)cobalt(III) on the basis of 'H N M R data. The crystal and molecular structures of the complexes rra«5-[bis(2-oximinopropionato)bis-(imidazole)]-(I) and ^ • a«5'-[bis(2-oximinopropionato)bis(pyridine)]cobalt(III) (II) were deter mined. I crystallizes in space group P 2/« with a = 14.167(2), b = 8.774(_1), c = 14.785(2)Ä, ß = 113.37(1)°, Z = 4, Dca)c = 1.568 g e m '3. II crystallizes in space group P 1 with a = 9.122(2), b = 10.038(2), c = 11.759(2) A, a = 69.95(1)°, ß = 67.47(2)°, y = 69.49(2)°, Z = 2, Dcalc = 1.547 g-cm~3. The structures were refined to unweighted R factors of 0.036 and 0.028, respec tively. The coordination sphere around Co is pseudo-octahedral with the 2-oxim inopropionato ligands occupying four equatorial positions, and the amines in axial po sitions. | | | |
Reference
| Z. Naturforsch. 48b, 409—417 (1993); received November 2 1992 | | | |
Published
| 1993 | | | |
Keywords
| Cobalt, Oximiocarboxylic Acid, Amine, X-Ray | | | |
Similar Items
| Find | | | DEBUG INFO
| | | | | TEI-XML for
| default:Reihe_B/48/ZNB-1993-48b-0409.pdf | | | | Identifier
| ZNB-1993-48b-0409 | | | | Volume
| 48 | |
| 105 | Author
| JohannK. Lessmann, Helmut Rupa, Lackner, Karen Schmidt-Bäse, GeorgeM. Sheldrick | Requires cookie* | | | Title
| Holger | | | | Abstract
| The isolation o f Juglorubin (2) from cultures o f Streptomyces spp., which produce a series o f other hydroxynaphthoquinones, is described. 2 is a unique, unusually condensed ionic color | | | |
Reference
| Z. Naturforsch. 48b, 672 (1993); eingegangen am 21. Dezember 1992 | | | |
Published
| 1993 | | | |
Keywords
| Antibiotics, Juglomycins, X -Ray, N M R Spectra | | | |
Similar Items
| Find | | | DEBUG INFO
| | | | | TEI-XML for
| default:Reihe_B/48/ZNB-1993-48b-0672.pdf | | | | Identifier
| ZNB-1993-48b-0672 | | | | Volume
| 48 | |
| 106 | Author
| ThomasG. Meyer, PeterG. Jones, Reinhard Schmutzler | Requires cookie* | | | Title
| Darstellung neuer Monofluorphosphine und einiger ihrer Übergangsmetallkomplexe; Einkristall-Röntgenstrukturanalyse eines Platin(II)-Komplexes Preparation of New M onofluorophosphines and Some o f their Transition Metal Complexes; Single Crystal X-Ray Diffraction Study o f a Platinum (II) Complex | | | | Abstract
| The reaction of lithiated precursors with PC12F led to a num ber of monofluorophosphines, including the known di-/e>7-butylmonofluorophosphine, 1. Bis(phenylethinyl)monofluoro-phosphine (2) was accessible only via this route (the classical method of synthesizing 2 by chlorine/fluorine exchange is impossible, because the corresponding chlorophosphine is un known). Bis(2-methoxyphenyl)fluorophosphine (5) was prepared via the organolithium /PCl2F route. The N M R results for 5 thus prepared were inconsistent with previous reports, implying that the previously reported synthesis o f 5 is in error. From 5 a m -dichloroplatinum (II) com plex (6) was synthesized and subjected to a single crystal X-ray structure analysis, confirming the expected planar coordination. From bis(2,3-dimethoxynaphthyl)monofluoro-phosphine (7) a rhodium(I) (8) and an iron(0)tetracarbonyl complex (9) were prepared. An iron(0)tetracarbonyl complex (11) was synthesized from bis(9-anthryl)monofluorophosphine (10) which was found to be stable to redox disproportionation. | | | |
Reference
| Z. Naturforsch. 48b, 875—885 (1993); eingegangen am 16. Februar 1993 | | | |
Published
| 1993 | | | |
Keywords
| Dichlorofluorophosphine, M onofluorophosphines, Transition Metal Complexes, X-Ray | | | |
Similar Items
| Find | | | DEBUG INFO
| | | | | TEI-XML for
| default:Reihe_B/48/ZNB-1993-48b-0875.pdf | | | | Identifier
| ZNB-1993-48b-0875 | | | | Volume
| 48 | |
| 107 | Author
| Vadim Pavlenko, Vladimir Kokozay, Olga Babich | Requires cookie* | | | Title
| Direct Synthesis of Tetranuclear Complexes of Copper(II) with /i4-Bridging Oxygen | | | | Abstract
| The direct synthesis of a num ber complexes with general composition Cu4OCl6 «(CH 3)2NH-raSolv, where n = 4, m = 0 -2 and Solv = C H 3OH, DMSO, is reported. It is shown by X-ray structure investigation, that in Cu4OCl6-4 (C H 3)2N H the copper atoms are linked by //4-oxygen and //2-chlorine bridging atoms, while molecules of (CH3)2NH are at tached to the metal atoms via nitrogen ones. | | | |
Reference
| Z. Naturforsch. 48b, 1321—1324 (1993); received April 22 1993 | | | |
Published
| 1993 | | | |
Keywords
| Direct Synthesis, Copper(II) Complexes, X-Ray | | | |
Similar Items
| Find | | | DEBUG INFO
| | | | | TEI-XML for
| default:Reihe_B/48/ZNB-1993-48b-1321.pdf | | | | Identifier
| ZNB-1993-48b-1321 | | | | Volume
| 48 | |
| 108 | Author
| Dieter Seilmann, Helge Friedrich, Falk Knoch | Requires cookie* | | | Title
| Transition Metal Complexes with Sulfur Ligands, XCIX | | | | Abstract
| Form ation and Structure of [Fe('S4')]4. A Rem arkable Tetram erization of Homochiral [Fe('S4')] Complex Fragments ('S4'2-= l,2-Bis(2-m ercaptophenylthio)ethane(2-)) In MeOH/THF solution, Fe(II) ions and the tetradentate thioether-thiolate 'S4'2"([l,2-Bis(2-mercaptophenylthio)ethane(2-)]) slowly form the tetrameric [Fe('S4')]4 1. The crystal structure of 1 THF -2MeOH was determined by X-ray structure analysis. Chiral 1 crystallizes as a pair of enantiomers each of which consist of four homochiral [Fe('S4')] fragments bridged via /i2-and //3-S(thiolato) donors; stereochemical aspects o f the enantiospecific tetramerization of [Fe('S4')] fragments are discussed. In strong polar solvents such as dimethylformamide, dis sociation of [Fe('S4')]4 into [Fe('S4')]2 fragments is indicated by the formation o f [Fe(CO)('S4')]2 upon reaction with CO. | | | |
Reference
| Z. Naturforsch. 48b, 1675—1680 (1993); eingegangen am 9. Juli 1993 | | | |
Published
| 1993 | | | |
Keywords
| Iron Sulfur Complex, Chirality, X-Ray | | | |
Similar Items
| Find | | | DEBUG INFO
| | | | | TEI-XML for
| default:Reihe_B/48/ZNB-1993-48b-1675.pdf | | | | Identifier
| ZNB-1993-48b-1675 | | | | Volume
| 48 | |
| 109 | Author
| Herrn Prof, Dr, J. Otto, Scherer | Requires cookie* | | | Title
| Übergangsmetall-substituierte Acylphosphane und Phosphaalkene, XIX [1] | | | | Abstract
| Synthese und Strukturbestimmung von l-Metallo-l,2-dihydrophospheten (jj5-C5Me5XCO)2M -P C H (E)-C (E)= C -NMe2 (M = Fe, Ru; E = C 0 2Me, CN) Transition Metal Substituted Acylphosphanes and Phosphaalkenes, XIX [1] Synthesis and Structure Determ ination of l-M etallo-l,2-dihydrophosphetes (^5-C5M e5)(CO)2M -P C H (E)-C (E) = C -N M e 2 (M = Fe, Ru; E = C 0 2 Me, CN) L othar Weber* 3, O laf Kam inski3, H ans-Georg Stammler3, Beate Neumann3, Vadim D. R om anenkob The metallo-phosphaalkenes (/75-C5Me5)(CO)2M -P = C (N R 2)2 (4a,b, 5) result from the reac tion of the corresponding bromo compounds (/75-C5Me5)(CO)2MBr with Me3Si-P = C (N R 2)2. The complexes 4a and 5a are cleanly converted into the l-metallo-l,2-dihydrophosphetes (//5-C5Me5)(CO)2M -PCH(E)-C(E) = C -NM e2 (lO a -c) (M = Fe, Ru; E = C 0 2Me, CN) by treatment with equimolar amounts of dimethyl fumarate or fumarodinitrile, respectively. The products 4a,b, 5 and lO a -c have been characterized by elemental analysis as well as by spec troscopic data (IR, 'H, 13C, 3IP NM R, MS). The molecular structures o f 4a and 10a have been determined by single crystal X-ray analysis. | | | |
Reference
| Z. Naturforsch. 48b, 1784—1794 (1993); eingegangen am 23. Juni 1993 | | | |
Published
| 1993 | | | |
Keywords
| Phosphaalkenes, Metallo-l, 2-dihydrophosphetes, X-Ray | | | |
Similar Items
| Find | | | DEBUG INFO
| | | | | TEI-XML for
| default:Reihe_B/48/ZNB-1993-48b-1784.pdf | | | | Identifier
| ZNB-1993-48b-1784 | | | | Volume
| 48 | |
| 110 | Author
| W. Olfgang Eikens, P. Eter, G. Jones, Jü Rg, L. Au Tn Er, C. Arsten, Thöne | Requires cookie* | | | Title
| Complexes of Copper, Silver, and Gold with Urea Homologues. Crystal Structures of I{/i2-SeC(NH2)2} Ag{SeC(NH2)2}2]22+2 Cl~ * 4 DMF and [Ph3PAu{SC(NHMe)2}]+Cl" * SC(NHMe)2 | | | | Abstract
| The title compounds were prepared from chloro(organophosphine)metal(I) complexes and the urea homologues SeC(NH2)2 and SC(NHMe)2 in good yields. Recrystallization of [Ph,PAg{SeC(NH2)2}]+C r from D M F/C H 2C12 leads in low yield to the dinuclear complex [{/r-SeC(NH2)2}Ag{SeC(NH2)2}2]22+2 C r-4 D M F . The crystal structure reveals short A g-A g contacts and unexpectedly acute angles at the bridging selenium atom. The crystal structure of [Ph3PAu{SC(NHMe)2}]+Cl_ • SC(NHMe)2 shows short N --C1 and N -S con tacts that probably correspond to hydrogen bonding. | | | |
Reference
| (Z. Naturforsch. 49b, 21—26 [1994]; received August 12 1993) | | | |
Published
| 1994 | | | |
Keywords
| Coinage Metal Complexes, X-Ray, Urea Homologues | | | |
Similar Items
| Find | | | DEBUG INFO
| | | | | TEI-XML for
| default:Reihe_B/49/ZNB-1994-49b-0021.pdf | | | | Identifier
| ZNB-1994-49b-0021 | | | | Volume
| 49 | |
| 111 | Author
| Dieter Sellmann+, Helge Friedrich, Falk Knoch, Matthias Moll | Requires cookie* | | | Title
| Übergangsmetallkomplexe mit Schwefelliganden, C*. Unerwartet einfache Bildung von Diazen-Komplexen und ein neuer Typ von Diastereomerie: [/#-N2H2{Fe(PPr3)('S4')}2] und analoge Komplexe mit [FeS]-Zentren. ( 'S /2-= l,2-Bis(2-mercaptophenylthio)ethan(2-)) Transition Metal Complexes with Sulfur Ligands, C*. Unexpectedly Facile Formation of Diazene Complexes and a New Type of Diastereomerism: [a-N2H2{Fe(PPr3)('S4')}2] and Analogous Complexes with [FeS]-Centers. ('S4'2~ = l,2-Bis(2-mercaptophenylthio)ethane(2-)) | | | | Abstract
| Single pot reactions of FeCl2-4H20 with the tetradentate thioether-thiol 'S4-H 2' = 1,2-bis(2-mercaptophenylthio)ethane, phosphines such as PEt3, PPr3 or PBu3, and a ca. 40-fold excess of N2H4-H20 yield, in the presence of air, diazene complexes of the general formula [M-N2H2{Fe(PR3)('S4')}2]. In contrast to previous syntheses of diazene complexes, the yields can excel 80%, and the syntheses can be carried out on a 10 g scale. [M-N2H2{Fe(PPr3)('S4')}2], 1 and [M-N2H2{Fe(PEt3)('buS4')}2], 2 were characterized by X-ray structure analysis. 2 contains 'buS4'2-= l,2-bis(3,5-ditertiarybutyl-2-mercaptophenylthio)-ethane(2-), which is the tertiary-butyl derivative of 'S4'2-. 1 and 2 contain fram-HN=NH which bridges enantiomeric [Fe(PPr3)('S4')] or [Fe(PEt3)('buS4')] fragments. HN=NH is stabilized by 4c -6 e~-jr bonds, strong tricentric N -H — (S)2 bridges, and steric shielding. NMR studies show that centrosymmetric 1 isomerizes in solution at temperatures around 0 °C in order to give a diastereomerie diazene complex which is also centrosymmetric. The diastereomerism is traced back to bridging the chiral [Fe(PPr3)('S4')] fragments by frara-HN=NH in a differ ent way. The two different bridging modes are verified by X-ray structure analyses of analo gous ruthenium complexes. Because this new type of diastereomerism is basically caused by a different position only of the N -H — (S)2 bridges, it is termed hydrogen bridge diastereo merism. A mechanism for the isomerization is suggested. 1 exhibits three anodic waves in the cyclovoltammogram. The second wave indicates formation of the dication [1]2+, which is a redox isomer of the diprotonated (and as yet hypothetical) dinitrogen complex [a-N2{Fe(PPr3)('S4')}2]. The significance of [1]2+ and of its Lewis basic thiolate donors with respect to electrochemical reduction of molecular dinitrogen under mild conditions is dis cussed. | | | |
Reference
| (Z. Naturforsch. 49b, 76—88 [1994]; eingegangen am 9. Juli 1993) | | | |
Published
| 1994 | | | |
Keywords
| Diazene, Iron Sulfur Complexes, Synthesis, X-Ray | | | |
Similar Items
| Find | | | DEBUG INFO
| | | | | TEI-XML for
| default:Reihe_B/49/ZNB-1994-49b-0076.pdf | | | | Identifier
| ZNB-1994-49b-0076 | | | | Volume
| 49 | |
| 113 | Author
| Dieter Sellm, Helge Friedrich, Falk Knoch | Requires cookie* | | | Title
| Synthese und Struktur von *1,33N2H4 Transition Metal Com plexes with Sulfur Ligands, Cl*. Synthesis and Structure of N 2H 5[Fe(N 2H4)(S2C6H4)2] * 1,33 N 2H 4 | | | | Abstract
| A ttem pts to coordinate N2H4 to [Fe(S2C6H 4)2] fragments lead to N2H 5[Fe(N2H 4)(S2C6H4)2], which crystallizes from M eOH/N2H 4 solutions as the solvate [(N2H 5){Fe(N2H4)(S2C6H4)2} T.33 N2H 4], 1, and has been characterized by X-ray structure analysis. 1 contains three discrete N2H 5+ cations, four N2H4 solvate molecules and three independent [Fe(N2H4)(S2C6H4)2] anions which are connected via an extended network of N -H —N and N -H —S bridges. N2H 5[Fe(N2H 4)(S2C6H4)2] and 1 contain high-spin Fe(III) centers and labile N2H4 ligands. Ubergangsmetallkomplexe mit Schwefelliganden, CI*. | | | |
Reference
| Z. Naturforsch. 49b, 660—664 (1994); eingegangen am 22. Dezember 1993 | | | |
Published
| 1994 | | | |
Keywords
| Iron Sulfur Hydrazine Complexes, Synthesis, X-Ray | | | |
Similar Items
| Find | | | DEBUG INFO
| | | | | TEI-XML for
| default:Reihe_B/49/ZNB-1994-49b-0660.pdf | | | | Identifier
| ZNB-1994-49b-0660 | | | | Volume
| 49 | |
| 114 | Author
| D. Ieter Sellmann, Thomas Hofmann, Falk Knoch | Requires cookie* | | | Title
| Ni(II)-und Ni(III)-Komplexe mit dem fünfzähnigen Thioether- Thiolat-Amin-Liganden 'NMeS4'2_ ('NMeS4'2_ = Dianion von 2,2'-Bis(2-mercaptophenylthio)diethylmethylamin) Transition Metal Complexes with Sulfur Ligands, CV* Ni(II) and Ni(III) Complexes with the Pentadentate Thioether- Thiolate-Amine-Ligand 'N MeS4'2_ ('N MeS4'2-= Dianion of 2.2'-Bis(2-m ercaptophenylthio)diethylmethylamine) | | | | Abstract
| Paramagnetic [N i('N MeS4')]2 1 ('N MeS4'2_ = 2.2'-Bis(2-m ercaptophenylthio)diethylm ethyl-a m in e(2 -)) was synthesized from N i(ac)2 and N a2-'N MeS4' and characterized by X-ray structure analysis. In solid state, 1 contains two pseudo-octahedral [N i('N MeS4')] fragments bridged via thiolate donors. In contrast to the parent com plex [N i('N HS4')]2, the thiolate and thioether donors coordinate cis to the Ni center forming m eso [N i('N MeS4')] fragments of Cs symmetry. 1 readily dissociates in solution to give mononuclear [N i('N MeS4')]. Reaction of [N i('N MeS4')]2 1 with PM e3 yielded [N i(PM e3)('N MeS4')] 2, oxidation by io dine gave the Ni(III) complex [N i(I)('N MeS4')] 3. Ubergangsmetallkomplexe mit Schwefel-Liganden, CY* | | | |
Reference
| Z. Naturforsch. 49b, 821 (1994); eingegangen am 15. Februar 1994 | | | |
Published
| 1994 | | | |
Keywords
| Nickel Complexes, Thioether-Thiolate-Amine-Ligands, X-Ray | | | |
Similar Items
| Find | | | DEBUG INFO
| | | | | TEI-XML for
| default:Reihe_B/49/ZNB-1994-49b-0821.pdf | | | | Identifier
| ZNB-1994-49b-0821 | | | | Volume
| 49 | |
| 115 | Author
| E. Ndre Kövári, Roland Krämer | Requires cookie* | | | Title
| Metallkomplexe 6,6'-Dialkinyl-substituierter 2,2'-Bipyridin | | | | Abstract
| Liganden: Synthese und Struktur von [{6,6'-(CH3CH2CH2C = C)2bpy}Cu(Cl)(^-Cl)]2 Metal Complexes of 6 ,6 '-Dialkynyl-Substituted 2,2'-Bipyridine Ligands: Synthesis and Structure of [{6 ,6 '-(C H 3 CH2CH2C = C)2bpy}Cu(Cl)(a-Cl)] 2 The bipyridyldiacetylene 6,6'-(C H 3CH2CH2C = C)2bpy (1) was prepared by palladium catalyzed C -C -cou p lin g reaction of 6,6'-dibromo-2,2'-bipyridine with pentyne. Reaction of 1 with anhydrous CuCl2 in acetonitrile gave the dimeric, chloro-bridged complex (1)C u(C1)(m-C1)2Cu(C1)(1) (2), which was characterized by X-ray crystallography. The copper atoms in 2 are square-pyramidally coordinated with normal in-plane C u -N and C u -C l bond distances and one longer, apical bond to the second bipyridyl nitrogen atom. The influence of steric hindrance o f the bipyridyl 6,6'-substituents on the structure o f the complex is discussed. | | | |
Reference
| Z. Naturforsch. 49b, 1324—1328 (1994); eingegangen am 9. Mai 1994 | | | |
Published
| 1994 | | | |
Keywords
| Copper Bipyridine Complexes, Bipyridylacetylenes, X-Ray | | | |
Similar Items
| Find | | | DEBUG INFO
| | | | | TEI-XML for
| default:Reihe_B/49/ZNB-1994-49b-1324.pdf | | | | Identifier
| ZNB-1994-49b-1324 | | | | Volume
| 49 | |
| 117 | Author
| Bernd Wrackmeyer, Udo Dörfler, Wolfgang Milius, Max Herberhold | Requires cookie* | | | Title
| Triferrocenylborane -Molecular Structure in Solution and in the Solid State | | | | Abstract
| According to a single crystal X-ray structure determination all three ferrocenyl substituents of triferrocenylborane (1) adopt the same orientation with respect to the BC3-plane [P 2 Jc\ monoclinic; Z = 4; a = 1353.5(3), b = 1695.6(3), c = 1056.4(2) pm, ß = 109.27(3)°]. The simu lated X-ray powder pattern of the single crystal is identical with the powder diagram o f a macroscopic sample, indicating the presence of a single diastereomer (l a) in the solid state. How ever, at low temperature (< -9 5 °C) in solution, the 13C NM R spectra suggest the pres ence of the second diastereomer (lb) in which one ferrocenyl group is oriented opposite to the other two with respect to the central BC3-plane. | | | |
Reference
| Z. Naturforsch. 50b, 201—2 (1995); received July 25 1994 | | | |
Published
| 1995 | | | |
Keywords
| Triferrocenylborane, 13C NMR Spectra, Dynamic Processes, X-Ray | | | |
Similar Items
| Find | | | DEBUG INFO
| | | | | TEI-XML for
| default:Reihe_B/50/ZNB-1995-50b-0201.pdf | | | | Identifier
| ZNB-1995-50b-0201 | | | | Volume
| 50 | |
| 118 | Author
| Thomas Schmidt, Stephan Neis, Richard Goddard | Requires cookie* | | | Title
| Synthesis, Structure, and Properties of Homoleptic l-Oxa-l,3-diene Molybdenum and Tungsten Complexes | | | | Abstract
| Homoleptic tris(l-oxa-l,3-diene)m olybdenum and tungsten complexes are formed as yel low, crystalline compounds in 54-80% isolated yield on treatm ent of the corresponding /3-unsubstituted a,/3-unsaturated ketones with W (CO)3(CH 3CH 2CN)3 or (y6-C6H 6)M o(CO)3 in refluxing hexane. Reaction of these oxadienes with (^6-C6H 5CH3)2Mo in tetrahydrofuran or /7-hexane provides a new high yield route to homoleptic molybdenum complexes that are otherwise difficult to prepare. X-ray crystal structure analyses of two air-stable, isomeric tungsten complexes reveal a significant contribution of a cr2,?/2-bonding mode in the coordi nated oxadiene moieties. U nder reaction conditions that allow the platinum catalyzed hydro genation of phenyl substituents in these ligands, the coordinated oxadiene fragments are inert, thus demonstrating an unprecedented chemoselectivity in the hydrogenation of aryl-substituted enones. On the other hand, the complexes are labile enough to catalyze the cyclotrimerization of alkynes such as methyl propiolate. | | | |
Reference
| Z. Naturforsch. 50b, 315—325 (1995); received September 7 1994 | | | |
Published
| 1995 | | | |
Keywords
| Oxadiene Complex, Molybdenum, Tungsten, X-Ray, Selective Hydrogenation | | | |
Similar Items
| Find | | | DEBUG INFO
| | | | | TEI-XML for
| default:Reihe_B/50/ZNB-1995-50b-0315.pdf | | | | Identifier
| ZNB-1995-50b-0315 | | | | Volume
| 50 | |
| 119 | Author
| B. Gabor, R. Goddard, S. Holle, P. W. Jolly, C. Krüger, R. Mynott, W. Wisniewski | Requires cookie* | | | Title
| T h e R eaction o f D ien es with [F e (P r z2P ( C H 2) /IP P r /2) ] Species | | | | Abstract
| D ed ica ted to Prof. D r. Dr. h.c. m u lt G ü n th e r W ilk e o n the o cca sio n o f his 70th birthday The structure of the compounds formed upon reacting Fe(Pr'2P(C H 2)"PPr'2)Cl2 (n = 1-3) and active-Mg with acyclic and cyclic 1,3-, 1,4-and 1,5-dienes depends upon the nature of the diene and upon the length of the methylene-chain bridging the two P-atoms of the biden-tate ligand. For example, isoprene reacts to give either (774-isoprene)2FePPr'2C2H4PPr'2 or (^4-isoprene)Fe(Pr'2PC3H6PPr'2) while the products of the reaction with 1,5-hexadiene are (?75-l-methylpentadienyl)Fe(Pr'2PC2H 4PPr'2)H or (//2,?/2-l,5-hexadiene)Fe(Pr'2PC3H6PPr'2). The crystal structures of the last two compounds have been established by X-ray diffraction. The penultimate species catalyses the linear dimerization of 1,5-hexadiene. | | | |
Reference
| Z. Naturforsch. 50b, 503—513 (1995); received September 15 1994 | | | |
Published
| 1995 | | | |
Keywords
| Iron-Organo Complex, Diene Pentadienyl, X-Ray | | | |
Similar Items
| Find | | | DEBUG INFO
| | | | | TEI-XML for
| default:Reihe_B/50/ZNB-1995-50b-0503.pdf | | | | Identifier
| ZNB-1995-50b-0503 | | | | Volume
| 50 | |
| 120 | Author
| K. Polborn, W. Steglich, J. D. Connolly, S. Huneck, To Prof, G. Antonio, Gonzalez | Requires cookie* | | | Title
| Structure of the Macrocyclic Bis-lactone Lepranthin from the Lichen Arthonia im polita; an X-Ray Analysis celebrating his half-century of involvement with natural products chemistry | | | | Abstract
| The structure and relative stereochemistry o f lepranthin from the lichen Arthonia impolita has been elucidated as 1 by NM R spectroscopy and X-ray analysis. | | | |
Reference
| Z. Naturforsch. 50b, 1111—1114 (1995); received February 20 1995 | | | |
Published
| 1995 | | | |
Keywords
| Lepranthin, Macrocyclic Bis-lactone, X-Ray, Lichen | | | |
Similar Items
| Find | | | DEBUG INFO
| | | | | TEI-XML for
| default:Reihe_B/50/ZNB-1995-50b-1111.pdf | | | | Identifier
| ZNB-1995-50b-1111 | | | | Volume
| 50 | |
|
