| http://www.w3.org/ns/prov#value | - an arylene group which may have a substituent; and A represents (i) a phosphonium salt of formula--P.sup.+ (R.sup.22).sub.3 B.sup.--, in which R.sup.22 is phenyl group or a lower alkyl group, and B is a halogen atom; or (ii) a dialkyl phosphorous acid group of formula --PO(OR.sup.23).sub.2, in which R.sup.23 is a lower alkyl group.In the above-mentioned reaction for preparation of the aminostilbe
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