2,2(diarlyl)vinylphosphine compound, palladium catalyst thereof, and process for producing arylamine, diaryl, or arylalkyne with the catalyst

A 2,2-(diaryl)vinylphosphine compound represented by formula (1):

• wherein R1 is an alkyl group having 1 to 6 carbon atoms, an alicyclic group having 5 to 7 carbon atoms, or a phenyl group which may have one or more substituents;
• R2 and R3 are independently an alkyl group having 1 to 6 carbon atoms, an alicyclic group having 5 to 7 carbon atoms, or a phenyl group which may have one or more substituents;
• R4, R5, R6, and R7 are independently an alkyl group having 1 to 6 carbon atoms, an alicyclic group having 5 to 7 carbon atoms, a phenyl group which may have one or more substituents, an alkoxy group having 1 to 6 carbon atoms, a dialkylamino group in which each alkyl has 1 to 3 carbon atoms, a halogen atom, a benzyl group, a naphthyl group, or a halogen-substituted lower alkyl group having 1 or 2 carbon atoms, provided that R4 and R5 taken together and/or R6 and R7 taken together may represent a fused benzene ring, a substituted fused benzene ring, a trimethylene group, a tetramethylene group, or a methylenedioxy group;
• and
• p, q, r, and s are independently 0 to 5, provided that p+q and r+s each is in the range of from 0 to 5.