Patent ID: 7078568

Claim:
A primary phosphine compound represented by the following formula (2): wherein R 5 and R 6 each independently represents a hydrogen atom, a C 1-5 alkyl group, a C 1-5 alkoxy group, a di(C 1-5 alkyl)amino group, a 5- to 8-membered cyclic amino group or a halogen atom; R 7 represents a C 1-5 alkyl group, a C 1-5 alkoxy group, a di(C 1-5 alkyl)amino group, a 5- to 8-membered cyclic amino group or a halogen atom; and at least one R 5 and R 6 , and R 6 and R 7 pair is fused together to form at least one of a trimethylene group, a tetramethylene group, a pentamethylene group, a methylenedioxy group, an ethylenedioxy group and a trimethylenedioxy group.