Patent ID: 6900352

Claim:
A chiral phosphine compound of the formula wherein Spacer is a molecule having two functional groups each capable of attaching to a phosphorus atom on a six-membered phosphaline ring; wherein X is selected from the group consisting of oxygen, sulfur, methylene (—CH 2 —), —NR 3 , and PR 3 ; wherein R 1 is selected from a group consisting of substituted alkyl, substituted alkenyl substituted alkynyl, substituted aryl, and substituted alkylaryl; R 1 ′ is selected from a group consisting of hydrogen, substituted alkyl, substituted alkenyl substituted alynyl, substituted aryl, and substituted alkylaryl; and wherein R 3 is selected from a group consisting of hydrogen, substituted alkyl, substituted alkenyl, substituted alkynyl, substituted aryl, substituted alkylaryl.