series of enantiomerically pure bis(myrtanyl)tin compounds, cis-Myr2SnX2 (1, X = Ph; 3, X = Cl; 5, X = H) and trans-Myr2SnX2 (2, X = Ph; 4, X = Cl; 6, X = H) were prepared starting from (–)-1S-β-pinene and characterized by multinuclear NMR spectroscopy and in case of 3 and 4 also by X-ray crystallography. The reduction of 3 and 4 with Mg selectively produced pentastannane rings, cyclo-(cis-Myr2Sn)5
[EN] CHIRAL ORGANOSILICON HYDRIDES<br/>[FR] HYDRURES DE COMPOSES ORGANOSILICIUM CHIRAUX
申请人:CHIROGEN PTY LTD
公开号:WO2004018487A1
公开(公告)日:2004-03-04
The invention provides a method for enantioselectively reducing a prochiral carbon centred radical having one or more electron donor groups attached directly to the central prochiral carbon atom of the radical, and/or attached to a carbon atom within 1 to 4 atoms of the central prochiral carbon atom, comprising treating said radical with an activated chiral non-racemic organosilicon hydride in the presence of a Lewis acid. The invention also provides a novel class of activated chiral non-racemic organosilicon hydrides.
Synthesis and structure of some cis-and trans-myrtanylstannanes
作者:Jens Beckmann、Andrew Duthie、Marian Grassmann
DOI:10.1016/j.jorganchem.2008.10.013
日期:2009.1
Enantiomerically pure cis- and trans-myrtanylstannanes cis-MyrSnPh3 (1), trans-MyrSnPh3 (2), cis-MyrSnPh2Cl (3), trans-MyrSnPh2Cl (4), cis-MyrSnPhCl2 (5), trans-MyrSnPhCl2 (6), cis-MyrSnCl3 (7), trans-MyrSnCl3 (8) were synthesized and fully characterized by 1H, 13C and 119Sn NMR spectroscopy. The molecular structures of 1, 3, 6, 7, and [trans-MyrSn(OH)Cl2 · H2O]2 (8a) a hydrolysis product of 8, were
Rock around the Ring: An Experimental and Theoretical Study of the Molecular Dynamics of Stannyltriphospholes with Chiral Tin Substituents
作者:Martin Hofmann、Tim Clark、Frank W. Heinemann、Ulrich Zenneck
DOI:10.1002/ejic.200701321
日期:2008.5
Grignard reagents prepared in situ leads to diphenyltin chlorides 7a–e, which contain chiral organyl substituents. The 2-bornyl derivative 7a forms a mixture of exo and endo isomers and the (–)-menthyl derivative 7b yields a mixture of epimers, whereas the cis- and trans-myrtanyl complexes 7c and 7d and the m-(2-bornyl-2-ene)phenyl species 7e form only one enantiomer as the tin atom is separated from the