Process for producing phosphite

Details Process for producing phosphite Process for producing phosphite

C - Chemistry, Metallurgy

07

F

C07F 9/6571 (2006.01) C07F 9/6574 (2006.01)

Patent

CA 2466457

There is provided a process for producing a phosphite of the formula (I): (See formula I) wherein R1, R2, R4 and R5 each independently represent a hydrogen atom, a C1-8 alkyl group, a C5-8 cycloalkyl group, a C6-12 alkylcycloalkyl group, a C7-12 aralkyl group or a phenyl group or a phenyl group substituted with an alkyl or an alkoxy group; R3 represents a hydrogen atom or a C1-8 alkyl group; A represents a C2-8 alkylene group or a *-C(=O)- or *-C(=O)-R7- group in which R7 represents a C1-8 alkylene group, and the bond marked with * is the bond connected with the oxygen atom; and one of Y and Z represents a hydroxyl group, a C1-8 alkoxy group or a C7-12 aralkyloxy group and the other one represents a hydrogen atom or a C1-8 alkyl group, which process is characterized by the steps of (c) coupling a phenol compound of formula (II): (See formula II) wherein R1 to R3 are as defined above, in the presence of an inert solvent under oxidative condition to produce a reaction mixture containing a biphenol of formula (III): (See formula III) wherein R1 to R3 are as defined above, (b) extracting the biphenol compound of formula (III) from the reaction mixture with a hydrophobic organic solvent, and (c) reacting the biphenol compound of formula (III) in the solution of the hydrophobic organic solvent, with phosphorous trihalide, and a hydroxyl compound of formula (IV): (See formula IV) wherein R4, R5, Y, Z and A are as defined above, in the presence of a dehydrohalogenating agent.

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