Organic compounds -- part of the class 532-570 series – Organic compounds – Phosphorus containing
Reexamination Certificate
2006-01-17
2006-01-17
Witherspoon, Sikarl A. (Department: 1621)
Organic compounds -- part of the class 532-570 series
Organic compounds
Phosphorus containing
C568S017000, C556S016000
Reexamination Certificate
active
06987202
ABSTRACT:
Phosphine compounds represented by the following formula (1):wherein R1, R2, R3, R4, R5, R6and R7represent substituents, and asymmetric synthesis catalysts containing transition metal phosphine complexes with the compounds contained as ligands therein.The novel phosphine compounds according to the present invention are useful especially as ligands in transition metal complexes. The transition metal phosphine complexes are useful as catalysts for asymmetric synthetic reactions. The novel phosphine compounds useful as ligands can be prepared by a relatively economical preparation process. Further, use of these catalysts can afford hydrogenated products with high optically purity and is also extremely useful from the industrial standpoint.
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Nagasaki Izuru
Saito Takao
Shimizu Hideo
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