Patents Examined by Melvin Russell
  • Patent number: 5128488
    Abstract: The asymmetric hydrogenation of carbonyl compounds is carried out in the presence of at least one transition metal complex MZq(M=metal of group VIII of the Periodic Classication; Z=ligand selected among the atoms and the molecules which may complex the metal M; and q=degree of corrdination of M) and of at least one chiral phosphorous-containing ligand having formula (I), wherein R is hydrocarbonated radical (alkyl, cycloalkyl and aryl); R.sup.1 is H, hydrocarbonated radical or PR.sub.2 ; R.sup.2 is H or hydrocarbonated radical R.sup.3,R.sup.4, necessarily different, are H and optionally functionalized hydrocarbonated radicals; R.sup.5 and R.sup.6 are H and optionally functionalized hydrocarbonated radicals; one of the radicals R.sup.3 and R.sup.4 possibly carrying a function - OPR.sub.2 or NPR.sub.2, R.sup.5 and R.sup.6 being in this case H when R.sup.1 is PR.sub.2 ; R.sup.2 and R.sup.3 and the atoms of N and C which cary them respectively forming a heterocycle; or R.sup.2 and R.sup.
    Type: Grant
    Filed: April 27, 1990
    Date of Patent: July 7, 1992
    Assignee: Societe Chimique des Charbonnages S.A.
    Inventors: Andre Mortreux, Francis Petit