compound 2a the aluminium atoms possess a trigonal-bipyramidal arrangement with the coordination polyhedron defined by three carbon and two sulfur atoms. Two of the three CH2SMe ligands are bridging ligands (μ-η2; 1kC:2kS), the third one is terminal bound (η1; kC). The structure is polymeric. Crystals are threaded by helical chains built up of six-membered Al2C2S2 rings. Crystals of 2b are built up of
Synthesis and structure of bis(thiomethyl)magnesium compounds [Mg(CH2SR)2(thf)3] (R = Me, Ph) - the first dimethylmagnesium compounds functionalized by a Lewis-basic heteroatom
作者:Dirk Steinborn、Tobias Rüffer、Clemens Bruhn、Frank W. Heinemann
DOI:10.1016/s0277-5387(98)00106-5
日期:1998.9
Hg(CH2SR)(2), (R = Me (1), R = Ph (2)), prepared by reaction of HgCl2 with [Li-2(CH2SR)(2)(tmeda)(2)], reacts with magnesium activated by mercury in boiling THF to give [Mg(CH2SR)(2)(thf)(3)] (R = Me (3), R = Ph (4)). 3 readily splitts off THF in vacuo to give the solvate free complex [Mg(CH2SMe)(2)] (3'). The complexes 3' and 4 are fully characterized by microanalysis and NMR spectroscopy (H-1, C-13).The X-ray structure analyses of 3 and 4 reveal mononuclear compounds with two symmetry independent molecules in the unit cell of 3. In both complexes the coordination of Mg is trigonal-bipyramidal. The two apical positions are occupied by THF and the three equatorial positions by one THF and the two thiomethyl ligands. The C-Mg-C angles are slightly greater (123.9(1)-131.0(2)degrees) than the ideal angle for equatorial atoms in a trigonal-bipyramidal coordination. In neither case, the sulfur atoms are involved in the coordination of Mg. (C) 1998 Elsevier Science Ltd. All rights reserved.
Über die natur der übergangsmetall-kohlenstoff-σ-bindung
作者:Rudolf Taube、Dirk Steinborn、Bernhard Adler
DOI:10.1016/0022-328x(84)80570-7
日期:1984.10
2PhSCH2Li · 1.5N(CH2CH2)3N · 0.5THF (I) and PhSCH2Li · 2THF (II) can be isolated in a crystalline state from solutions of PhSCH2Li which have been obtained by metallation of thioanisole with BuLi/N(CH2CH2)3N and PhLi, respectively, according to Corey and Seebach. Thioanisolyllithium reacts with HgCl2 to give (PhSCH2)2Hg (III) and 2PhSCH2HgCl · HgCl2, (IV). III reacts with lithium to form PhSCH2Li,