| 21 | Author
| Dietmar Kuck, Hans-Friedrich Grützmacher | Requires cookie* | | Title
| Der Einfluß der Kettenlänge auf die massenspektrometrigche Fragmentierung höherer l.co-Diphenylalkane The Influence of the Chain Length on the Mass Spectrometric Fragmentation of Higher 1, co-Diphenylalkanes  | | | Abstract
| The mass spectrometric fragmentation of l,co-diphenylalkanes (2 < co < 22) has been studied in order to elucidate the effect of the chain length on the reactions of unstable and metastable molecular ions with respect to the occurrence of internally solvated ions in the gas phase. The unstable molecular ions of all l,co-diphenylalkanes react predominantly by formation of C?H7+ and C7Hg + " ions, the latter ones are also formed by metastable molecular ions. Neither the variation of the relative abundances of these fragment ions with the chain length nor the fragmentation of specifically deuterated molecular ions indicate any internal solvation in the reacting ions. Inspite of the localized activated C-H bonds at the benzylic positions, these "activated" H atoms are not involved in intra-molecular hydrogen exchange reactions or the formation of C7Hs + ' ions (with the exception of co = 3). Especially the higher homologues (co > 12) react very similarly to the molecular ions of 1-phenylalkanes, while the fragmentation of the lower homologues (co < 6) is determined by specific ("vinculoselective") competitive reactions, e.g. loss of CvH?' and CsHs. | | |
Reference
| Z. Naturforsch. 34b, 1750—1764 (1979); eingegangen am 12. Juli 1979 | | |
Published
| 1979 | | |
Keywords
| Mass Spectrometry, 1, co-Diphenylalkanes | | |
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| default:Reihe_B/34/ZNB-1979-34b-1750.pdf | | | Identifier
| ZNB-1979-34b-1750 | | | Volume
| 34 | |
22 | Author
| Bernhard Glaser, ErwinP. Mayer, Heinrich Nöth, Wilfried Rattay, Ulrich Wietelmann | Requires cookie* | | Title
| Beiträge zur Chemie des Bors, 190 [1] Synthese und Molekülstruktur von 1,2-Dihydroboreten und Azadiboretidinen Contribution to the Chemistry of Boron, 190 [1] Synthesis and Molecular Structure of 1,2-Dihydrodiboretes and Azadiboretidines  | | | Abstract
| [2+2]-Cycloadditions of 9-Fluorenylidentetramethylpiperidinoboranes have been studied with selected olefines, acetylenes and iminoboranes. No reactions with olefines were observed. While propiolic methylester reacts exclusively at the carbonyl bond producing the oxaboretane 5, alkines such as diethylamino-alkines, cyclo-octine and phenylacetylene provide access to the'1,2-dihy-droboretenes 6, 3 and 2. Tetramethylpiperidinoiminoboranes make 1.2.4-azadiboretidines 7 available. 6a and 7a contain a folded four-membered ring as shown by X-ray structure analysis. There is only a weak 1,3-intraannular interaction due to BN-;r-bonding of the boron atoms with their exocyclic amino group. | | |
Reference
| Z. Naturforsch. 43b, 449—456 (1988); eingegangen am 10. Dezember 1987 | | |
Published
| 1988 | | |
Keywords
| Reactivity of Aminomethyleneboranes, Transannular Interaction, X-Ray, 1, 2-Dihydroboret Derivatives, 1, 24-Azadiboretidine Derivatives | | |
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| default:Reihe_B/43/ZNB-1988-43b-0449.pdf | | | Identifier
| ZNB-1988-43b-0449 | | | Volume
| 43 | |
25 | Author
| Nazmi Abd, Elatife Kassab, Sanaa Osman Abdallah, Hamed Abdel, Reheem Ead, Doreya Zaki | Requires cookie* | | Title
| Some New Tetrahydrothiopyrano[2,3-d]thiazole-2-thione Derivatives and their Biological Activities 3-Phenyl-2,4  | | |
Reference
| (Z. Naturforsch. 31b, 376—379 [1976]; received August 14 1975) | | |
Published
| 1976 | | |
Keywords
| thiazolidinedithiones, 1, 4-Cycloaddition, Heterodienes, Synthesis, Biological Activities | | |
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| default:Reihe_B/31/ZNB-1976-31b-0376.pdf | | | Identifier
| ZNB-1976-31b-0376 | | | Volume
| 31 | |
26 | Author
| EricaL. Weinberg, J.Thomas Burton, MichaelC. Baird, Max Herberhold | Requires cookie* | | Title
| A Novel Isomerization of an Electron-Rich Alkene  | | | Abstract
| Displacement of 2-methvlpropene from [Fp(Me2C = CH2)]BF4 (Fp = (/?5-C5H5)Fe(CO)2) by Z-1,2-dimethoxyethylene (Z-DME) gives [Fp(Z-DME)]BF4. Displacement by E-1,2-dimethoxyethylene (E-DME), in contrast, does not give the expected complex of E-DME, but rather the complex of the Z-alkene. A mechanism involving scission of the C = C bond of the coordinated alkene to give a bis-carbene intermediate is proposed. | | |
Reference
| Z. Naturforsch. 36b, 485—487 (1981); received February 9 1981 | | |
Published
| 1981 | | |
Keywords
| Organoiron Complexes, Olefin Isomerization, 1, 2-Dimethoxyethylene | | |
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| default:Reihe_B/36/ZNB-1981-36b-0485.pdf | | | Identifier
| ZNB-1981-36b-0485 | | | Volume
| 36 | |
27 | Author
| Hubert Schmidbaur, Thomas Costa | Requires cookie* | | Title
| Synthese eines Doppel-Carbodiphosphorans und seiner Vorstufen Synthesis of a Double-Carbodiphosphorane and its Precursors  | | | Abstract
| The reaction of 1,4-dibromobutane with bis(diphenylphospliino)methane (1) yields two products, one of which is identified as butane-l,4-bis[diphenyl(diphenylphosphinomethyl)-phosphonium bromide] (3 a). Transylidation of this bis-phosphonium salt using two equiv-alents of (CH3)3P = CH2 affords the bis-ylide [CH2CH2P(C6H5)2 = CH-P(C6H5)2]2 (4) in high yields. This conversion can be reversed on treatment of 4 with etheral HCl (to give 3b). Methylation of 4 with CH3I occurs at phosphorus, however, and produces the bis-semiylide salt (5), [CH2CH2P(C6H5)2CHP(C6H5)2CH3]2 2e 2Iö. Transylidation of 5 (again with (CH3)3P = CH2) leads to the bis-carbodiphosphorane (6), [CH2CH2P(C6H5)2 = C = P(C6H5)2CH3]2. All compounds were characterized by elemental and detailed NMR analyses. The second product of the above quaternisation reaction is a cyclic bis-phosphonium salt (2) with a seven-membered ring structure. | | |
Reference
| Z. Naturforsch. 37b, 677—79 (1982); eingegangen am 9. Februar 1982 | | |
Published
| 1982 | | |
Keywords
| 1, 4-Dibromobutane, Transylidation, Carbodiphosphorane, Bis-carbodiphosphorane, Ylides | | |
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| default:Reihe_B/37/ZNB-1982-37b-0677.pdf | | | Identifier
| ZNB-1982-37b-0677 | | | Volume
| 37 | |
28 | Author
| Richard Neidlein, Dagmar Knecht, Alfred Gieren, Catalina Ruiz-Pérez | Requires cookie* | | Title
|  | | | Abstract
| The synthesis of 1 by reaction of phenanthro[9,10-c]-l,2,5-selenadiazole with ethylmagnesium-bromide and TeCI 4 is described; the X-ray structure analysis is reported. | | |
Reference
| (Z. Naturforsch. 42b, 84—90 [1987]; eingegangen am 9. August 1986) | | |
Published
| 1987 | | |
Keywords
| Chalkogen-Diimides, 1, 2, 5-Telluradiazole, X-Ray | | |
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| default:Reihe_B/42/ZNB-1987-42b-0084.pdf | | | Identifier
| ZNB-1987-42b-0084 | | | Volume
| 42 | |
30 | Author
| Gabriele Rebera, Jürgen Riede3, Nils Wibergb, Gerhard Wagnerb, Gerhard Müller | Requires cookie* | | Title
| Silaheterocyclen: Molekülstruktur eines 3-Oxa-2  | | | Abstract
| ,4,6,7-tetrasiIabicycIo[3.1.1]heptans Silaheterocycles: Molecular Structure of a 3-Oxa-2,4,6,7-tetrasilabicyclo[3.1.l]heptane A ccording to an X-ray structure analysis l,5-b is(di-rm -butylrnethylsilyl)-2,2.4.4,6.6,7,7-octa-m ethyl-3-oxa-2,4,6,7-tetrasilabicyclo[3.1. l]heptane (1) is a rigid bicyclic m olecule consisting o f a 1,3-disilacyclobutane ring whose 2,4 positions are bridged by a M e:Si —O —SiM e: fragment. The four-m em bered ring is non-planar with a dihedral angle o f 33.8° along the C —C axis. The intraring valence angles at carbon are significantly smaller than those at silicon leading to a transannular Si • • • Si distance o f only 2.558(1) Ä (triclinic, space group P I with a = 9.125(2), b = 12.668(2), c = 15.499(3) Ä , a = 101.25(1), ß = 87.87(1), y = 96.88(1)°. V = 1744.4 Ä 3, R (w R) = 0 .0 4 4 (0 .0 5 1) for 316 refined parameters and 5156 observables). | | |
Reference
| Z. Naturforsch. 44b, 796—799 (1989); eingegangen am 17. März 1989 | | |
Published
| 1989 | | |
Keywords
| Crystal Structure Cyclic D isiloxane, 1, 3-Disilacyclobutane | | |
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| default:Reihe_B/44/ZNB-1989-44b-0796.pdf | | | Identifier
| ZNB-1989-44b-0796 | | | Volume
| 44 | |
31 | Author
| Christian Müller, ThomasG. Meyer, Michael Farkens, R.Alf Sonnenburg, Reinhard Schmutzler | Requires cookie* | | Title
| Zur Chemie der 4,6-D ioxo-l,3,5,2 A3-triazaphosphinane. Teil II*. Darstellung von 4,6-Dioxo-l,3>5,2 A3-triazaphosphinanen  | | |
Reference
| Z. Naturforsch. 47b, 760—7 (1992); eingegangen am 30. Dezember 1991 | | |
Published
| 1992 | | |
Keywords
| 1, 3, 5-Triorganosubstituted Biurets, 1, 3, 5-Triorgano-Substituted 4, 6-D ioxo-l, 3, 5, 2A 3-triazaphosphinanes, N M R Spectra, M ass Spectra | | |
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| default:Reihe_B/47/ZNB-1992-47b-0760.pdf | | | Identifier
| ZNB-1992-47b-0760 | | | Volume
| 47 | |
32 | Author
| Tristram Chivers, Masood Parvez, Peter Zoricak | Requires cookie* | | Title
| Preparation and X-Ray Structure of 4-BrC6H4CNSC(Cl)N  | | | Abstract
| The title compound was obtained in 82% yield by the intramolecular cyclization of 4-BrC6H4C(NSCCl3)[N(SiMe3)2] in CH2CI2 at 23°C. It crystallizes in the triclinic system, space group PI, a = 7.957(3) Ä, b = 10.864(5) A, c = 5.625(1) A, a = 95.94(3)°, ß = 97.79(2)°, 7 = 100.72(3)°, V = 469.2(3) A3, and Z -2. The bond lengths of the planar C2N2S ring indicate partial 7r-delocalization. | | |
Reference
| Z. Naturforsch. 52b, 557—559 (1997); received September 5 1996 | | |
Published
| 1997 | | |
Keywords
| Crystal Structure, 1, 2, 4-Thiadiazole, Intramolecular Cyclization | | |
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| default:Reihe_B/52/ZNB-1997-52b-0557.pdf | | | Identifier
| ZNB-1997-52b-0557 | | | Volume
| 52 | |
33 | Author
| Z. Ah Id, M. Aq, L+-, M. Ashooda, H. Asan, KevinT. Pott, M. Alik++, C., T. Anveer, A., N. Izam Ic, W. Olfgang | Requires cookie* | | Title
| Syntheses of Anomeric Pairs of New C-Nucleosides via 1,3-Dipolar Cycloaddition Reaction, Part I  | | | Abstract
| A convenient pathway to a variety of ß-and a-C-nucleosides has been developed by utiliz ing 1,3-dipolar cycloaddition reactions of various exocyclic and endocyclic heterocyclic ylides with ß (5a) and a (5b) anomers of ethyl 3-(2',3'-0-isopropylidene-5'-0-trityl-D-ribofurano-syl) propiolate, respectively. Assignment of configuration at exposition of the C-nucleosides could be made by a comparative study of the properties of corresponding a and ß anomers with a reasonable degree of certainity. | | |
Reference
| Z. Naturforsch. 52b, 1383—1392 (1997); received July 21 1997 | | |
Published
| 1997 | | |
Keywords
| C-Nucleosides, 1, 3-Dipolar Cycloadditions | | |
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| default:Reihe_B/52/ZNB-1997-52b-1383.pdf | | | Identifier
| ZNB-1997-52b-1383 | | | Volume
| 52 | |
34 | Author
| Tristram Chivers, Xiaorong Li, Masood Parvez | Requires cookie* | | Title
| Preparation and X-Ray Structure of 3,5-Dimethyl-1,4-dichloro-1,2,6- thiadiazine-1 -oxide  | | | Abstract
| The title compound was obtained by the reaction of 3,5-dimethyl-2//-l,2,6-thiadiazine-l,l-dioxide with PCI5 in chloroform. It crystallizes in the monoclinic system, space group P2\/c, a = 7.521(7) A, b = 8.400(4) A, c = 13.908(4) Ä, ß = 100.35(4)°, V = 864.4(8) A3, and Z = 4. The S(VI) atom lies 0.43 A out of the plane of the 7r-delocalized NCCCN unit. The mean S-N bond distance is 1.569(3) A. | | |
Reference
| Z. Naturforsch. 53b, 532—534 (1998); received December 18 1997 | | |
Published
| 1998 | | |
Keywords
| Crystal Structure, 1, 2, 6-Thiadiazines, Sulfanuric Chloride | | |
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| default:Reihe_B/53/ZNB-1998-53b-0532.pdf | | | Identifier
| ZNB-1998-53b-0532 | | | Volume
| 53 | |
35 | Author
| U. D. Rutkow Ski, P. Strauch | Requires cookie* | | Title
| Oxidative S-S-Kopplung von 1,2-Dithiooxalat durch intramolekulare Redoxreaktion der Selen(II)-und Tellur(II)-Komplexe O xidative S-S C oupling o f 1,2-D ithiooxalate by Intramolecular R edox Reaction o f the Selenium (II) and Tellurium (II) C om plexes  | | | Abstract
| The reaction of sodium monochalcogenopentathionates, Na2[Y(S20 3)2] (Y = Se, Te) with potassiumdithiooxalate in a water/methanol solution in presence of large cations (e. g. Ph4P+, Ph4As+ or BzlPh3P+) yields complexes of the type [Y(dto)2]2~ (Y = Se, Te). These complexes are of limited stability and undergo a redox reaction in solution. As the main product of this redox process the 3,4-dithiahexane-2,5-dione-l,6-di(thiocarboxylate) was isolated and characterized by X-ray structure analysis as the benzyltriphenylphosphonium salt (monoclinic space group P2^/c, Z = 2, a = 8.899(5) A, b = 16.458(2) Ä, c = 16.034(6) A and ß = 98.02(2)°). With Te_+ (Y = Te) as the coordination center we have been able to isolate the intermediate complex (Ph4P)2[Te(dto)2], | | |
Reference
| (Z. Naturforsch. 54b, 73—76 [1999]; eingegangen am 13. August 1998) | | |
Published
| 1999 | | |
Keywords
| 1, 2-Dithiooxalate, X-Ray Data, Disulfide | | |
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| default:Reihe_B/54/ZNB-1999-54b-0073.pdf | | | Identifier
| ZNB-1999-54b-0073 | | | Volume
| 54 | |
36 | Author
| Bettina Eichhorn, Heinrich Nöth | Requires cookie* | | Title
| New Diazasilaphosphetidines and their Precursors  | | | Abstract
| A series of aminosilanes (R 'H N bSiR : have been prepared. In case of bulky substituents R' the aminolysis of Ph^SiCb stops at the (R'HN)ClSiPh2 stage. Replacement of the Cl atom is achieved with LiNHR' which allows the synthesis o f mixed bisaminosilanes (R'HN)(R"HN)SiPh2. The X-ray structures of three of these compounds have been determined. There are no intermolecular N-H -N hydrogen bonds in these compounds in the solid state. Several 1,3,2,4-diazaphosphetidines have been synthesized using bis(N-lithioamino)silanes and bis(N-lithioamino)phosphanes . Amongst these the heterocycle 18 possesses an almost planar four membered N iSiP ring system. | | |
Reference
| Z. Naturforsch. 55b, 352—360 (2000); received January 18 2000 | | |
Published
| 2000 | | |
Keywords
| Bis(monoorganylamino)diorganylsilanes, 1, 3, 2, 4-Diazasilaphosphetinides | | |
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| default:Reihe_B/55/ZNB-2000-55b-0352.pdf | | | Identifier
| ZNB-2000-55b-0352 | | | Volume
| 55 | |
37 | Author
| ProfG. Dr, Mloston | Requires cookie* | | Title
| Metallkomplexe  | | | Abstract
| mit funktionalisierten Schwefelliganden, XV [1]. Reaktionen von Platin(0)-Komplexen mit 1,2,4-Trithiolanen, 1,2,4,5-Tetrathianen, 1,2,3,5,6-Pentathiepanen sowie Thioketonen. Kristallstrukturanalyse von (Ph3P)2Pt(772-Ph2C=S) M etal Com plexes o f Functionalized Sulfur C ontaining Ligands, XV [1]. Reactions of Platinum(O) Com plexes w ith 1,2,4-Trithiolanes, 1,2,4,5-Tetrathianes, 1,2,3,5,6-Penta-thiepanes as well as Thioketones. X -R ay Structure A nalysis o f (Ph3P)2Pt(/72-Ph2C=S) W olfgang W eigand2, R alf W ünsch3, C hristian R obl3, Grzegorz M lostonb, Heinrich N öthc und M anfred Schm idt0 3,3,5,5-Tetraphenyl-1,2,4-trithiolane (1) reacts with twofold excess of (Ph3P)2Pt(?/2-C2H4) (4) to give a 1:1 mixture of the complexes (Ph3P)2Pt (SCPh2S) (6a) and (Ph3P)2Pt(?/2-Ph2C=S) (7a). Treatment of 3,3,6,6-tetraphenyl-l,2,4,5-tetrathiane (2) with a fourfold excess of 4 yields [Pt2(PPh3)4(/j-S)2] (8) and the platinum(O) compound 7a. The reaction of the 1,2,3,5,6-pentathiepane 3 with a fourfold excess of 4 affords a 1:1:1 mixture of 8, the platinum(O) complex 7b and the bis-thiolato platinum(II) complex 6b. The thioketone complexes 7a-c were formed in smooth reactions of 4 with the thioketones 5a-c. The molecular structure of (Ph3P)2Pt(?/2-Ph2C=S) (7a) has been established by single-crystal X-ray analysis. | | |
Reference
| Z. Naturforsch. 55b, 453—458 (2000); eingegangen am 28. Februar 2000 | | |
Published
| 2000 | | |
Keywords
| 1, 2, 4-Trithiolanes, Thioketones, Platinum Complexes | | |
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| default:Reihe_B/55/ZNB-2000-55b-0453.pdf | | | Identifier
| ZNB-2000-55b-0453 | | | Volume
| 55 | |
38 | Author
| Florian Breitsameter, Peter Mayer, Alfred Schmidpeter | Requires cookie* | | Title
| Die Kondensation von Ylidylchlorphosphanen mit Phosphanen und Bis(diphenylphosphanyl)methan und -amin The Condensation o f Ylidyl Chlorophosphines with Phosphines and Bis(diphenylphosphino)methane and -amine  | | | Abstract
| Ylidyl chlorophosphanes 1 and dichlorophosphanes 2 react with trimethylsilyl phosphanes to yield the ylidyl diphosphanes 3, 4,5, 7 and the 2-ylidyl triphosphanes 8. From the reaction of compounds 1 with lithium diphosphanyl amide and diphosphanyl methanide result the ylidyl diphosphonium ylides 11 and ylidyl diphosphinimines 13. The former rearrange to give the ylidyl triphosphanyl methanes 12. The chloromethyl diphosphinimine 13c enters a cyclization to give the 1,2,3,5-azatriphosphole derivative 14, the structure of which has been solved by X-ray analysis. From the reaction of ylidyl bis(chlorophosphanes) 17 and 20 with the same reagents the 1,2,4,5-tetraphosphinine derivative 18 and the 1,2,3,5,6-azatetraphosphinine derivatives 19 and 21 are obtained. | | |
Reference
| Z. Naturforsch. 55b, 519—526 (2000); eingegangen am 21. Februar 2000 | | |
Published
| 2000 | | |
Keywords
| Phosphonium Ylides, Diphosphanes, 1, 2, 3, 5-Azatriphospholes | | |
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| default:Reihe_B/55/ZNB-2000-55b-0519.pdf | | | Identifier
| ZNB-2000-55b-0519 | | | Volume
| 55 | |
40 | Author
| Max Herberhold3, Yan-Xiang Chenga, Guo-Xin Jinb, Wolfgang Milius3 | Requires cookie* | | Title
| l  | | | Abstract
| ,r-Di(terf-butyl)metallocenium Cations. The X-Ray Crystal Structures of [M(C5H4'Bu)2]PF6 (M = Fe, Co) and [ C o ^ H / B u ^ C o C ^ The hexafluorophosphate salts [Fe(C5H4'Bu)2]PF6 (1) and [C o ^H /B u ^lP F ö (2) crystal lize in isotypic structures with centrosymmetric cations which have a staggered (transoid) conformation of the exactly parallel ring ligands (conformational angle r = 180°). The | | |
Reference
| Z. Naturforsch. 55b, 814—820 (2000); received May 26 2000 | | |
Published
| 2000 | | |
Keywords
| 1, 1 '-Disubstituted Ferrocenes, Ferrocenium Cations, Cobaltocenium Salts | | |
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| default:Reihe_B/55/ZNB-2000-55b-0814.pdf | | | Identifier
| ZNB-2000-55b-0814 | | | Volume
| 55 | |
|