Unprecedented stereochemical control in the intramolecular ene-reactions of δ,ε-unsaturated aldehydes using exceptionally bulky organoaluminum reagents: Elucidation of the transition state
作者:Takashi Ooi、Keiji Maruoka、Hisashi Yamamoto
DOI:10.1016/s0040-4020(01)89682-4
日期:——
Unprecedentedstereochemicalcontrol has been achieved in the type II intramolecular ene reactions of δ,ε-unsaturated aldehydes leading to trans-cyclohexanols with excellent selectivity under very mild conditions, using exceptionally bulky methylaluminum bis(4-bromo-2,6-di-tert-butylphenoxide) (MABR). Success of the stereocontrolled cyclization can be ascribable to the ability of this modified organoaluminum
Cyclopentenone formation via hydrogen activation in the reactions of chromium carbene complexes with alkynes
作者:Cynthia A. Challener、William D. Wulff、Benjamin A. Anderson、Steve Chamberlin、Katherine L. Faron、Oak K. Kim、Christopher K. Murray、Yao Chang Xu、Dominic C. Yang、Stephen D. Darling
DOI:10.1021/ja00057a020
日期:1993.2
alkyl chromium carbene complexes with alkynes have been found to give cyclopentenones. Mechanisms are proposed to account for the formation of these products that involve metal hydride intermediates. As has been previously reported for tungsten, molybdenum alkyl complexes have been found to give 1,3-dienes rather than cyclopentenones. The difference between chromium and molybdenum and tungsten may be
ALDEHYDE COMPOUNDS AND THEIR USE IN PERFUME COMPOSITIONS
申请人:Closson, Adam P.
公开号:EP3072876A1
公开(公告)日:2016-09-28
The present invention is directed to aldehyde compounds and a method of improving, enhancing or modifying a fragrance formulation through the addition of an olfactory acceptable amount of the aldehyde compounds.
Aldehyde compounds and their use in perfume compositions
申请人:INTERNATIONAL FLAVORS & FRAGRANCES INC
公开号:US10150722B2
公开(公告)日:2018-12-11
The present invention is directed to novel aldehyde compounds and a method of improving, enhancing or modifying a fragrance formulation through the addition of an olfactory acceptable amount of the novel aldehyde compounds.