A further breakthrough in biphasic, rhodium-catalyzed hydroformylation: the use of Per(2,6-di-O-methyl)-β-cyclodextrin as inverse phase transfer catalyst
Solvent free biphasic hydroformylation of various water-insoluble terminal olefins can be achieved in high yields and selectivities by using a water-soluble rhodium/triphenylphosphine trisulfonate catalyst and per(2,6-di-o-methyl)-beta-cyclodextrin as inverse phase transfer catalyst. The catalytic activities were up to ten times higher than those observed without per(2,6-di-o-methyl)-beta-cyclodextrin.
US3932483A
申请人:——
公开号:US3932483A
公开(公告)日:1976-01-13
Combination claisen-nitrile oxide annulation. A strategy for ring construction with rigid stereocontrol dictated by an allylic hydroxyl group.
作者:Dennis P. Curran、Patricia B. Jacobs
DOI:10.1016/s0040-4039(00)94771-3
日期:——
A new method for annulation of rings onto existing allylic alcohol derivatives is presented. The sequence involves Claisen rearrangement followed by nitrile oxide-olefin cycloaddition. Control of relevant stereochemistry is emphasized.