Provided is a method for the production of 1-menthol, which comprises hydrogenation of piperitenone with a transition metal complex of a specified optically active phosphine to produce pulegone, hydrogenation of the obtained pulegone with a ruthenium-phosphine-amine complex in the presence of base to obtain pulegol, and further hydrogenation of the pulegol with a transition metal catalyst.
and geometrical effects. The purely electronic influence of para substituents in complexes [(p-XC6H4)2P(CH2)4P(p-XC6H4)2}Rh(hfacac)] correlates directly with the Hammett σP constants of X, but leads to variations in the chemicalshift of less than 80 ppm between X = CF3 and X = OMe. In contrast, geometrical changes in complexes [(P2)Rh(hfacac)] lead to variations in the chemicalshift over a range of
申请人:SHELL INTERNATIONALE RESEARCH
MAATSCHAPPIJ B.V.
公开号:EP0577204B1
公开(公告)日:1996-10-09
COMPOSITION AND POLYMER
申请人:Asahi Kasei Kabushiki Kaisha
公开号:EP2735581B1
公开(公告)日:2021-07-14
Composition and Polymer
申请人:Nakamura Akitake
公开号:US20140121293A1
公开(公告)日:2014-05-01
Disclosed is a composition comprising (A) at least one compound selected from the group consisting of an ether compound having two or more ether groups, a trivalent phosphorus compound, and a ketone compound, (B) a boron trihalide, and (C) an episulfide compound.