The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 12, 2008
Filed:
Jul. 27, 2004
Nobuhiko Oohara, Tokyo, JP;
Tsuneo Imamoto, Chiba, JP;
Nobuhiko Oohara, Tokyo, JP;
Tsuneo Imamoto, Chiba, JP;
Nippon Chemical Industrial Co., Ltd., Koto-ku, JP;
Abstract
The present invention provides a process for producing an optically active phosphorus heterocyclic dimer including reacting, in the presence of a base, primary phosphine represented by formula (1)R—PH  (1)is reacted with a compound represented by formula (2)Y—CH  (2)in the presence of a base; the product is reacted with boron trihydride, oxygen, or sulfur to obtain a phosphorus heterocyclic compound represented by formula (3): the resultant compound is dimerized to produce a phosphorus heterocyclic dimer represented by formula (4): and then oxygen, sulfur, or borane is removed from the resultant phosphorus heterocyclic dimer to obtain an optically active phosphorus heterocyclic dimer represented by formula (5):