Novel phosphine compound, transition metal complex containing the same phosphine compound as ligand and asymmetric synthesis catalyst containing the complex

A phosphine compound of the formula (2):

• 10
• where R1 is a linear or branched alkyl group having 1 to 5 carbon atoms;
• R2 and R3 represent independently a hydrogen atom or an alkyl group having 1 to 5 carbon atoms;
• R4, R5, R6 and R7 represent independently a hydrogen atom, a halogen atom, an alkyl group having 1 to 5 carbon atoms, an alkoxy group having 1 to 5 carbon atoms, or a dialkylamino group, where the alkyl has 1 to 5 carbon atoms, with the proviso that R4 and R5 or R5 and R6 or R6 and R7 taken together with the carbon atoms to which they are attached optionally form a ring or fused ring;
• R11 is a linear or branched alkyl group having 1 to 5 carbon atoms, R21 and R31 represent independently a hydrogen atom or an alkyl group having 1 to 5 carbon atoms;
• R41, R51, R61 and R71 represent independently a hydrogen atom, a halogen atom, an alkyl group having 1 to 5 carbon atoms, an alkoxy group having 1 to 5 carbon atoms, a dialkylamino group, where the alkyl has 1 to 5 carbon atoms, Y represents a functional group that forms a stable bond with phosphorous atom;
• with the proviso that R41 and R51 or R51 and R61 or R61 and R71 taken together with the carbon atoms to which they are attached optionally form a ring or fused ring.