| http://www.w3.org/ns/prov#value | - e a phenyl group or a group represented by the formula: ???(CH2)p???PPh2 (wherein, p is an integer of 1 to 4), R8 to R11 are a hydrogen atom, A is an optionally substituted benzene ring, m and n are 1, and R2 to R4 are a phenyl group or a group represented by the formula: ???(CH2)p???PPh2 (wherein, p is an integer of 1 to 4), (d) a phosphonium compound wherein, in the above formula (I), R2 is a gr
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