Highly regioselective anti-Markovnikov hydrosilylation of alkenes under mild conditions: Application of CCC-NHC pincer Rh complexes

Le résumé fourni par la source

A highly selective hydrosilylation of alkenes at room temperature , catalyzed by well-defined CCC–NHC pincer Rh complexes, [( Bu C i C i C Bu )RhCl 2 Py] ( 1 ), [( Bu C i C i C Bu )RhCl 2 (NHMe 2 )] ( 2 ), [( Bu C i C i C Bu )RhCl(µ-Cl) 2 Rh(COD)] ( 3 ), and [( Bu C i C i C Bu )RhCl(µ-Cl)] 2 ( 4 ), ( Bu C i C i C Bu = 2-(1,3-bis(N-butylimidazol-2-ylidene)phenylene) has been achieved. The catalytic system exhibits excellent regioselectivity, affording anti-Markovnikov products in moderate to excellent conversions (48–100 %). Precatalyst [( Bu C i C i C Bu )RhCl(µ-Cl) 2 Rh(COD)] ( 3 ) demonstrated the highest efficiency in promoting the anti-Markovnikov hydrosilylation of both aryl and alkyl alkenes with excellent selectivity (>99 %) when Et 3 SiH is used as silane source in acetonitrile. Notably, the system tolerates straight chain alkyl alkenes without inducing isomerization , a commonly encountered limitation with many hydrosilylation catalytic systems.

Ce résumé expose les affirmations des auteurs. BNTIC ne l’interprète pas comme une validation indépendante des résultats.