| 41 | 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 | |
42 | 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 | |
43 | 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 | |
44 | 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 | |
45 | 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 | |
46 | Author
| Dorothee Petz, H. Ans-G, Erhard Löffler, Friedh Schneider | Requires cookie* | | Title
| Inhibition of E. coli l -Asparaginase by Reaction with 2,3-Butanedione. Chemical Modification of Arginine and Histidine Residues  | | | Abstract
| The inactivation o f E. coli asparaginase by 2,3-butanedione studied with L-asparagine and dia-zooxonorvaline as substrates obeys pseudo first order kinetics. Activity losses are linear with re spect to arginine and histidine m odification, with com plete inactivation being correlated with alter ation o f one arginine and one histidine per subunit. The rate o f inactivation o f the enzym was re duced in the presence o f com petitive inhibitors like L-2-am ino-2-carboxyethane-sulfonam ide. U n der comparable conditions 1,2-cyclo hexanedione does not affect the activity o f L-asparaginase. | | |
Reference
| Z. Naturforsch. 34c, 742 (1979); received May 8 1979 | | |
Published
| 1979 | | |
Keywords
| Asparaginase, 2, 3-Butanedione, Arginine and Histidine Residues | | |
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| default:Reihe_C/34/ZNC-1979-34c-0742.pdf | | | Identifier
| ZNC-1979-34c-0742 | | | Volume
| 34 | |
47 | Author
| Hamako Obata-Sasamoto, Atsushi Komamine, Koshi Saito | Requires cookie* | | Title
| Biosynthesis of 3-Carboxy-6,7-dihydroxy-l, 2,3,4-tetra- hydroisoquinoline and l-Methyl-3-carboxy-6,7-dihydroxy-l, 2,3,4- tetrahydroisoquinoline in a Callus Culture of Stizolobium hassjoo  | | | Abstract
| dl-[/?-14C] 3,4-Dihydroxyphenylalanine (DOPA), [2-14C]pyruvate and [2-14C]acetate were ad ministered to a callus culture o f S. hassjoo and incorporation of the radioactivity into 3-carboxy-6,7-dihydroxy-1,2,3,4-tetrahydroisoquinoline (I) and l-methyl-3-carboxy-6,7-dihydroxy-1,2,3,4-tetrahydroisoquinoline (II) was examined. Incorporation of radioactivity from labelled DOPA into I and II, and from acetate into I were observed, while that from pyruvate into I and II and from acetate into II were hardly detected. The biosynthetic pathways o f I and D were discussed. | | |
Reference
| Z. Naturforsch. 36c, 921 (1981); received August 21 1981 | | |
Published
| 1981 | | |
Keywords
| Stizolobium hassjoo, Biosynthesis, 3-Carboxy-6, 7-dihydroxy-1, 2, 3, 4-tetrahydroisoquinoline, 1 -Methyl-3-carboxy-6, 7-dihydroxy-1, 2, 3, 4-tetrahydroisoquinoline, Callus Culture | | |
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| default:Reihe_C/36/ZNC-1981-36c-0921.pdf | | | Identifier
| ZNC-1981-36c-0921 | | | Volume
| 36 | |
48 | Author
| KenjiM. Atsui, H. Iroyuki, S. Hinta, T. Adahiko, K. Ajiwara, A. Kikazu, H. Atan Ak | Requires cookie* | | Title
| Effect of Modification of Arginine Residues on the Activity of Soybean Lipoxygenase-1  | | | Abstract
| Arginine residues of soybean lipoxygenase-1 was modified with an arginine-directed chemical modifier, 2,3-butanedione. Although inactivation was not visible if the enzyme reac tion was monitored under the standard assay condition (83.3 |.im linoleic acid dispersed in 200 mM sodium borate, pH 9.0), rapid inactivation was observed with 5 mM sodium borate, pH 8.0. The inactivation was protected by the addition of a substrate, linoleic acid, in the modification mixture. Kinetic analyses indicated that one arginine residue accounted for the inactivation. Enzymological analyses showed that the modification narrowed the pH-activity profile of L-l and made L-l sensitive to salt concentration of the assay solution. Strong inactivation by modification was found at low salt concentration and low pH. This was not due to a physical change of the linoleic acid. On the other hand, product specificity of L-l was not altered after modification. Taken together, the modified arginine residue(s) was thought to be not essential to the catalysis but have an important role in supporting an ideal electrostatic interaction within L-l and/or between L-l and a substrate even in sub-optimal reaction conditions. | | |
Reference
| Z. Naturforsch. 50c, 37—4 (1995); received September 26/November 8 1994 | | |
Published
| 1995 | | |
Keywords
| Arginine, 2, 3-Butanedione, Modification, Soybean Lipoxygenase-1 | | |
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| default:Reihe_C/50/ZNC-1995-50c-0037.pdf | | | Identifier
| ZNC-1995-50c-0037 | | | Volume
| 50 | |
49 | Author
| W. L. Driessen, P.L A Everstijn | Requires cookie* | | Title
| Metal(II) Complexes of 1,2,5-Oxadiazole  | | | Abstract
| A series of new coordination compounds is reported with 1,2,5-oxadiazole (ODZ) as the ligand, viz. [M(ODZ)3](SbCl 6)2 with M = Mg(II), Mn(U), Fe(II), Co(II), Ni(II), and Zn(II). The metal ions are in a regular octahedral environment of six nitrogen atoms. The ligands function as bidentate bridges between the metal ions. | | |
Reference
| Z. Naturforsch. 33b, 1120—1123 (1978); received June 12 1978 | | |
Published
| 1978 | | |
Keywords
| Transition Metal Ions, 1, 2, 5-Oxadiazole, Ligand Field Spectra, IR | | |
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| default:Reihe_B/33/ZNB-1978-33b-1120.pdf | | | Identifier
| ZNB-1978-33b-1120 | | | Volume
| 33 | |
50 | Author
| Ger Vos, AnthonieJ. De Kok, GerritC. Verschoor | Requires cookie* | | Title
| Complexes of 1,2,4-Triazoles, Part XVII The Crystal Structure of Tris-/«-(4-ethyl-l,2,4-triazole-N l ,N 2 )- (4-ethyl-l,2,4-triazole-N 1 )-aquo-bis [bis(thiocyanato-N)- nickel(II)]hydrate, Ni2(C4N3H7)4(H20)(NCS)4 *H20 (x ~ 2.5)  | | | Abstract
| The crystal structure of Ni2(C4N3H7)4(H20)(NCS)4 • 2.5 H20 has been determined by X-ray diffraction techniques. The compound crystallizes in the monoclinic space group P2i/n with a — 15.121(4), 6= 13.237(2), c= 18.069(3), ß = 94.71(2)° and Z = 4; R = 0.040 (Rm = 0.051). The compound consists of dimeric units in which two Ni ions are bridged by three ethyltriazole (Ettrz) groups. For one Ni, two N donating NCS" groups and an Ettrz coordinating by only one N atom complete the NiNe octahedron. The other Ni atom, which is also octahedrally coordinated, has a coordinated water molecule instead of a monodentate Ettrz. | | |
Reference
| Z. Naturforsch. 36b, 809—813 (1981); received April 2 1981 | | |
Published
| 1981 | | |
Keywords
| 4-Ethyl-l, 2, 4-triazole, Binuclear Compound, Hydrogen Bonding | | |
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| default:Reihe_B/36/ZNB-1981-36b-0809.pdf | | | Identifier
| ZNB-1981-36b-0809 | | | Volume
| 36 | |
51 | Author
| Herbert Meier, Johannes Zountsas, Oswald Zimmer | Requires cookie* | | Title
|  | | | Abstract
| A X H and 13 C NMR spectroscopical study is performed on the basis of 37 1,2,3-selena-diazoles. Besides the discussion of chemical shifts and coupling constants of X H and 13 C, selenium satellites were measured providing 1 H 77 Se and 13 C 77 Se coupling constants. | | |
Reference
| Z. Naturforsch. 36b, 1017—1022 (1981); eingegangen am 16. April 1981 | | |
Published
| 1981 | | |
Keywords
| NMR Spectra, 1, 2, 3-Selenadiazoles, 77 Se Coupling | | |
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| default:Reihe_B/36/ZNB-1981-36b-1017.pdf | | | Identifier
| ZNB-1981-36b-1017 | | | Volume
| 36 | |
52 | Author
| Udo Plücken, Herbert Meier | Requires cookie* | | Title
| Lanthanide Induced Shifts in the »H and 13 C Nuclear Magnetic Resonance Spectroscopy for Structure Elucidations of Thiadiazole Oxides  | | | Abstract
| A systematic investigation of the LIS-method for structure elucidations is performed on the basis of thermally generated monoxides of 1,2,3-thiadiazoles. A calculation process for the evaluation of lanthanide induced shifts according to the McConnell-Robertson equa-tion was developed. The program can be applied to underdetermined systems with fewer variables than chemically not equivalent X H plus 13 C nuclei. A quality criterium for the method is given by 4-phenyl-l,2,3-thiadiazole-3-oxid -wellknown by an X-ray analysis. | | |
Reference
| Z. Naturforsch. 36b, 1305—1314 (1981); eingegangen am 21. Aprü 1981 | | |
Published
| 1981 | | |
Keywords
| 1, 2, 3-Thiadiazole-oxides, LIS Measurements, LIS Computer Program | | |
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| default:Reihe_B/36/ZNB-1981-36b-1305.pdf | | | Identifier
| ZNB-1981-36b-1305 | | | Volume
| 36 | |
53 | Author
| M. Torres, A. Clement, 0. P. Strausz | Requires cookie* | | Title
| Argon-Matrix Isolation of Bis(carbomethoxy)thiirene: Formation of Acyl and Carbalkoxythioketenes  | | | Abstract
| Photolysis of argon-matrix isolated 4,5-bis(carbomethoxy)-l,2,3-thiadiazole with A = 254 or 265 nm resulted in the almost quantitative formation of bis(carbomethoxy)-thiirene (3g). Photolysis of 3g could only be carried out by long irradiation times at short wavelength A = 210nm and resulted mainly in extensive fragmentation instead of the formation of bis(carbomethoxy)thioketene, confirming earlier predictions that substituents, especially electron-withdrawing ones, should stabilize the thiirene ring. Methylcarboethoxy and methylacetylthioketene were obtained, however, in the argon-matrix photolysis or flow thermolysis of 4-methyl-5-carboethoxy-or 4-carboethoxy-5-methyl-l,2,3-thiadiazole and 4-acetyl-5-methyl-l,2,3-thiadiazole, respectively. | | |
Reference
| Z. Naturforsch. 38b, 1208—1212 (1983); received June 6 1983 | | |
Published
| 1983 | | |
Keywords
| Thiirene, Thioketene, 1, 2, 3-Thiadiazole, Thio-Wolff Rearrangement | | |
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| default:Reihe_B/38/ZNB-1983-38b-1208.pdf | | | Identifier
| ZNB-1983-38b-1208 | | | Volume
| 38 | |
54 | Author
| Wim Vreugdenhil, MarcelF J Schoondergang, JaapG. Haasnoot, Jan Reedijk | Requires cookie* | | Title
| Magnetic and Spectroscopic Properties of Metal(II) Thiocyanate Compounds with 3,4-Dialkyl Substituted 1,2,4-TriazoIes  | | | Abstract
| Syntheses, spectroscopic and magnetic properties are described of a series of metal(II) thio-cyanate compounds with the asymmetric ligands 3-methyl-4-ethyl-l,2,4-triazole and 3-methyl-4-;-butyl-l,2,4-triazole. A dinuclear structure is proposed for the manganese, cobalt and nickel compounds based on the magnetic behaviour as well as on spectroscopic and analytical data. These compounds show antiferromagnetic interaction in the temperature range 4—80 K. The zinc compounds appear to be mononuclear, whereas a chain-like structure is proposed for the cad-mium compounds. | | |
Reference
| Z. Naturforsch. 42b, 791—795 (1987); received January 19 1987 | | |
Published
| 1987 | | |
Keywords
| Asymmetric 1, 2, 4-Triazoles, Magnetic Exchange, Binuclear Compounds, Thiocyanate | | |
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| default:Reihe_B/42/ZNB-1987-42b-0791.pdf | | | Identifier
| ZNB-1987-42b-0791 | | | Volume
| 42 | |
56 | Author
| MichaelW. Zenke, Karl Hensen | Requires cookie* | | Title
| Phasendiagramme und Exzeßvolumina der Systeme (CH^SiCK/Pvridin und (CH3)2CC12/Pyridin  | | | Abstract
| The isobaric melting and boiling diagrams for the systems: dimethyldichlorosilane/pyridine and 2,2-dichloropropane/pyridine are reproduced. The existence of the incongruently melting addition compounds (CH3)2SiCl2 (Pyridine)2 and [(CH3)2CC12]3 • Pyridine could be proved. Some measurements of the molar volume of mixtures of pyridine and dimethyldichlorosilane, and pyridine and 2,2-dichloropropane are reported. For both systems the molar excess vol ume has been calculated as a function of the mole fractions. | | |
Reference
| Z. Naturforsch. 49b, 412—416 (1994); eingegangen am 20. September 1993 | | |
Published
| 1994 | | |
Keywords
| Phase Diagrams, Pyridine, Dimethyldichlorosilane, 2, 2-Dichloropropane, Excess Volumes | | |
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| default:Reihe_B/49/ZNB-1994-49b-0412.pdf | | | Identifier
| ZNB-1994-49b-0412 | | | Volume
| 49 | |
57 | Author
| E. K. Yudin, K. V. Domasevitch, E. B. Rusanov | Requires cookie* | | Title
| Crystal and Molecular Structure of Isonitrosomalonodiamido- (2,2-dipyridyl)copper(II), Chloride Monohydrate [Cu(Dipy){ONC(CONH2)2}Cl] H20  | | | Abstract
| The crystal and molecular structure of the complex [Cu(Dipy){NDA}Cl] • H 20 , where (NDA) = {ONC(CONH2)2}~ anion (space group P I, triclinic, with a = 7.834(1), b = 9.923(1), c = 9.952(1)A, a = 93.60(1), ß = 93.65(1), y = 92.72(1)°, Z = 2) has been determined from X-ray diffraction data. The structure was refined to R -0.029 for 2243 reflections with I>3ct(I). The coordination polyhedron of Cu2+ can be described as a distorted square pyra mid with a chlorine atom in the apex, and with the central atom situated 0.258(3) A above the base of the pyramid towards the chlorine atom. The complicated system of hydrogen bonding involving the water of crystallization connects copper complex units in to the chains in the c direction. | | |
Reference
| Z. Naturforsch. 50b, 864—866 (1995); received O ctober 17 1994 | | |
Published
| 1995 | | |
Keywords
| Copper(II), Oximes, 2, 2-Dipyridyl, X-Ray Spectra | | |
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| default:Reihe_B/50/ZNB-1995-50b-0864.pdf | | | Identifier
| ZNB-1995-50b-0864 | | | Volume
| 50 | |
58 | Author
| Z. Naturforsch | Requires cookie* | | Title
| Synthese und Dimerisierungsverhalten des l,l-Bis(trimethylsilyl)-2-(2,5-diisopropylphenyl)silens  | | | Abstract
| Tris(trim ethylsilyl)silylmagnesium bromide, (Me^SiX^SiMgBr, reacts with 2.5-diisopropyl-benzaldehyde to give 2,5-diisopropylphenyl-tris(trimethylsilyl)silylmethanol (1). With sodium | | |
Reference
| Z. Naturforsch. 51b, 370—3 (1996); eingegangen am 21. August 1995 | | |
Published
| 1996 | | |
Keywords
| Silenes, Silene Dimerization, 2, 3-Disilanaphthalenes Tetrahydro, 1, 2-Disilacyclobutanes | | |
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| default:Reihe_B/51/ZNB-1996-51b-0370.pdf | | | Identifier
| ZNB-1996-51b-0370 | | | Volume
| 51 | |
59 | Author
| JosephG. Robe, Duc Le Van, JostW. Innemöller, Bernt Krebs, M. Echtild Läge | Requires cookie* | | Title
| Reaktive E=C(p-p)7r-Systeme, XLIII [1] Darstellung und Charakterisierung P-Phosphino-oder P-Arsino-substituierter Fluorphosphaalkene des Typs R2E-P=C(F)NEt2 (R = Me, CF3, Me2N; E = P, As)  | | | Abstract
| Reactive E=C(p-p)-7r System s XLIII [1] Synthesis and Characterization o f P -Phosphino or P-A rsino Substituted Fluoro-phosphaalkenes of the Type R 2E -P=C (F)N Et2 (R = Me, C F 3, M e7N; E = R As) The easily accessible phosphaalkene HP=C(F)NEt2 (lb) reacts with halophosphanes or -arsanes R2EX (X = Cl, I) in the presence of NEt3 to give P-phosphino-or -P-arsino sub stituted fluorophosphaalkenes of the type RiE-P=C(F)NEti (2 -6) in high yields (60 -85 %) [R2E: (CF3)2P (2), Me2N(CF3)P (3), Me2P (4), (CF3)2As (5), M e2As (6)]. The analogous re-action of ib with CF3PI2 (molar ratio 1:2) unexpectedly leads to the triphosphetene Et2N | | |
Reference
| Z. Naturforsch. 51b, 778—784 (1996); eingegangen am 30. November 1995 | | |
Published
| 1996 | | |
Keywords
| Phosphaalkenes, 1, 2, 3-Triphosphetenes, NMR Spectra, Crystal Structure | | |
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| default:Reihe_B/51/ZNB-1996-51b-0778.pdf | | | Identifier
| ZNB-1996-51b-0778 | | | Volume
| 51 | |
60 | Author
| Clemens Krempner1, Rhett Kempeb, Hartmut Oehme3 | Requires cookie* | | Title
| The Thermal Isomerization of a Tetrahydro-2,3-disilanaphthalene into a 1,2-Disilacyclobutane -The Conversion of a Formal Silene [2+4] Cyclodimer into the [2+2] Cycloadduct  | | | Abstract
| 1,2,3,8a-Tetrahydro-1 -mesityl-5,7,8a-trimethyl-2,2,3,3-tetrakis(trimethylsilyl)-2,3-disila-naphthalene (3), the formal [2+4] cyclodimer of the transient 2-mesityl-l,l-bis(trimethylsilyl)-silene (2), on thermal treatment gradually isomerizes to give a mixture of the [2+2] products (E)-and -predominantly -(Z)-3,4-dimesityl-1,1,2,2-tetrakis(trimethylsilyl)-l,2-disilacyclo-butane [(E/Z)-4], By prolonged heating or at higher temperatures both (E/Z)-3 and (Z)-4 are converted into (E)-4, the thermodynamically most stable head-to-head dimer of 2. Possible pathways of the isomerization processes are discussed. | | |
Reference
| Z. Naturforsch. 52b, 815—818 (1997); received February 14 1997 | | |
Published
| 1997 | | |
Keywords
| Silenes, Silene Dimerization, 2, 3-Disilanaphthalene Tetrahydro, 1, 2-Disilacyclobutane | | |
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| | | | TEI-XML for
| default:Reihe_B/52/ZNB-1997-52b-0815.pdf | | | Identifier
| ZNB-1997-52b-0815 | | | Volume
| 52 | |
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