ZfN: Search Results

Browse byFacets

Bookbag ( 0 )

'2' in keywords

Results 113 Items

3

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
	Similar Items	Find
	DEBUG INFO
	TEI-XML for	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
	Similar Items	Find
	DEBUG INFO
	TEI-XML for	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
	Similar Items	Find
	DEBUG INFO
	TEI-XML for	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
	Similar Items	Find
	DEBUG INFO
	TEI-XML for	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
	Similar Items	Find
	DEBUG INFO
	TEI-XML for	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
	Similar Items	Find
	DEBUG INFO
	TEI-XML for	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
	Similar Items	Find
	DEBUG INFO
	TEI-XML for	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
	Similar Items	Find
	DEBUG INFO
	TEI-XML for	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
	Similar Items	Find
	DEBUG INFO
	TEI-XML for	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
	Similar Items	Find
	DEBUG INFO
	TEI-XML for	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
	Similar Items	Find
	DEBUG INFO
	TEI-XML for	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
	Similar Items	Find
	DEBUG INFO
	TEI-XML for	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
	Similar Items	Find
	DEBUG INFO
	TEI-XML for	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
	Similar Items	Find
	DEBUG INFO
	TEI-XML for	default:Reihe_B/42/ZNB-1987-42b-0791.pdf
	Identifier	ZNB-1987-42b-0791
	Volume	42

55	Author		Requires cookie*
	Title	Darstellung und Kristallstruktur von 2
	Reference	(Z. Naturforsch. 47b, 1 [1992])
	Published	1992
	Keywords	4, 6-Triferrocenyl-1, 3, 5, 2, 4, 6-triselenatriborinan
	Similar Items	Find
	DEBUG INFO
	TEI-XML for	default:Reihe_B/47/ZNB-1992-47b-0001.pdf
	Identifier	ZNB-1992-47b-0001
	Volume	47

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
	Similar Items	Find
	DEBUG INFO
	TEI-XML for	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
	Similar Items	Find
	DEBUG INFO
	TEI-XML for	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
	Similar Items	Find
	DEBUG INFO
	TEI-XML for	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
	Similar Items	Find
	DEBUG INFO
	TEI-XML for	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
	Similar Items	Find
	DEBUG INFO
	TEI-XML for	default:Reihe_B/52/ZNB-1997-52b-0815.pdf
	Identifier	ZNB-1997-52b-0815
	Volume	52

3