| US 7,534,920 B2 | ||
| Optically-active bis(alkynylphosphino) ethane-borane derivative and process for producing the same | ||
| Tsuneo Imamoto, Chiba (Japan); Kazuhiro Yoshida, Chiba (Japan); Youichi Saitoh, Chiba (Japan); and Aya Koide, Chiba (Japan) | ||
| Assigned to Nippon Chemical Industrial Co., Ltd., Tokyo (Japan); and National University Corporation Chiba University, Chiba-shi (Japan) | ||
| Filed on Mar. 05, 2008, as Appl. No. 12/73,415. | ||
| Claims priority of application No. 2007-060784 (JP), filed on Mar. 09, 2007. | ||
| Prior Publication US 2008/0221362 A1, Sep. 11, 2008 | ||
| Int. Cl. C07F 9/02 (2006.01) | ||
| U.S. Cl. 568—10 | 5 Claims |
1. An optically-active bis(alkynylphosphino)ethane-borane compound represented by formula (1):
 wherein R1 and R2, which may be the same or different, each represent an alkyl group, a phenyl group, an alkylsilyl group or a hydrogen atom;
R3 represents a branched alkyl group, an alicyclic hydrocarbon group or an aromatic hydrocarbon group; and the asterisk * indicates
an optically-active site.
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