prov:value
| - (b) a phosphonium compound wherein, in the above formula (I), R2 is a group represented by the formula (II), R6, R7 and R9 are a phenyl group, R8 is a hydrogen atom, m is 0, n is 2, R1 and R5 are combined together to form a C1-4 alkylene group, and R3 and R4 are a phenyl group, (c) a phosphonium compound wherein, in the above formula (I), R1 is a group represented by the formula (II), R 5 to R7 ar
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