| 摘要 |
NEW MATERIAL:Complexes of formula I (A is allen or olefin group; X is halogen or olefin group; Y is halogen, boron tetrafluoride, etc.; Z is ruthenium or rhodium; R<1> is cyclohexyl or phenyl; R<2> and R<4> are lower alkyl or lower haloalkyl; R<3> is H or lower alkoxy). USE:An asymmetric hydrogenation catalyst, a hydrogenation catalyst, etc., excellent in its catalytic activity and enantio-selectivity, capable of ready preparation and showing a high activity without purification. PREPARATION:A dihalobiphenyl compound of formula II (X' is halogen) is initially reacted with a chloro-disubstituted phosphine oxide in the presence of t-butyllithium and the resultant racemic compound of formula III is then subjected to optical resolution to obtain an (R) compound or an (S) compound of formula III. The obtained compound is subsequently reduced using trichlorosilane-tertiary amine and the resultant compound of formula IV is then reacted with a compound of formula V (m is 1-3; n is 0-1) in an inert solvent. |
