Hans Peter Latscha

Synthese und Kristallstruktur eines 1(λ5),4(λ5)-Diphosphaazulens sowie dreier 1 -Phospha-1,6a-dihydropentalene / Synthesis and Crystal Structure of a 1(λ5),4(λ5)-Diphosphaazulene and of Three 1 -Phospha-1,6a-dihydropentalenes

The reaction of acetylene-bis(phosphonous-bisdimethylamide) (1) with tetraphenyl-cyclopentadienone (2) yields a 1-phospha-1,6a-dihydropentalene (4), which can be sulfurized with CS2 to give the 1-thio-compound 5, and oxidized with H2O2 to give the 1-oxo-compound 6. With dimethyl-acetylenedicarboxylate (7) an amazingly stable l (λ5),4(λ5)-diphosphapentalene (8) is generated, which reacts further with 7 to yield a l(λ5),4(λ5)-diphosphaazulene (9). The preparation of the new molecules 4, 5, 6, 9 and the crystal structures of 5 and 9 are reported.

Photochemische Synthese neuer zinnorganischer Verbindungen mit „aktiven“ Gruppen am Zinnatom (I) / Photochemical Synthesis of New Tinorganic Compounds with Active Substituents on Tin

By photochemically induced oxidative addition reactions the synthesis of some new tinorganic compounds was achieved. The reaction of dichloro-and diiodotin with 1,2-diiodobenzene (1) induced by ultraviolet radiation led to bis-(1-iodophenyl)diiodotin (2), bis-(1-iodophenyl)dichlorotin (3), 1 -iodo-2-(trichlorotin)benzene (4) and 1-iodo-2-(triiodotin)benzene (5). Iodosubstitution at the tin atom was also observed when dichlorotin was used as the starting compound. Analogous experiments with 1,2-dibromobenzene (6) and 1,2-dichloro-(7) gave no products

Synthese und Untersuchung neuer 1λ5, 4λ5-Diphosphapentalen- und 1λ5,4λ5 - sowie 1λ5,5λ5-Diphosphaazulen-Systeme / Synthesis of New 1λ5,4λ5-Diphosphapentalene- and 1λ5,5λ5-Diphosphaazulene Systems

Bis[bis(dimethylamino)phosphino]acetylene (2a) and two molecules of dimethyl- and diethyl-acetylenedicarboxylate (1a /1b ) react in a criss-cross-cycloaddition to yield 1λ5 ,4λ5- diphosphapentalenes (3), which react further with 1 to yield a 1λ5 ,4λ5-diphosphaazulenes (5). A mechanism of both reactions is proposed. The reaction of 1λ5,4λ5-diphosphaazulene with 1a at high pressure yields 1,1,4,4-tetrakis(dimethylamino)-3,5,6,7,8 -pentakis(methoxycarbonyl)- 2-[1,2,2tris(methoxycarbonyl)ethenyl]-1λ5,4λ5 -diphosphaazulene (7). The reaction of bis(diphenylphosphino) acetylene (2c) with 1a yields 1,5a-dihydro-1-methoxy-(1-methoxycarbonylethinyl)- 3,3,7,7-tetraphenyl)-2-oxa-3λ5,7λ5 -diphosphacyclopenta[1,2,3-c,d]azulene- 4,5,5a,6,8,9-hexakis(methoxycarbonyl) (9) and 4-(diphenylphosphoryl)-5-[1,2-bis-(methoxycarbonyl)- ethylidene]-1λ5-phosphol-2,3-bis(methoxycarbonyl) (10)

N-Brom-N-chlorsulfonamide. Herstellung und Reaktionen mit Phenylmetallverbindungen/N-Bromo-N-chlorosulfonamides. Preparation and Reactions with Phenylmetallics

Abstract The preparation of CH3SO2NBrCl and p-CH3C6H4NBrCl is described. These compounds react with (C6H5)4Sn, (C6H5)4Pb, and (C6H5)2Hg to give derivatives CH3SO2N(C1)M(C6H5)n-1. In these reactions one phenyl group is cleaved from the metal.