| http://www.w3.org/ns/prov#value | - espectively, (c) if desired, allowing the compound produced from (b) in which B is Cl, Br or I to react with a stannane comprising an optionally substituted alkyl, alkenyl, alkynyl, aryl or heterocyclic substituent, in the presence of a catalyst such as triphenylphosphine palladium, to give a compound of formula (I) in which B is an optionally substituted alkyl, alkenyl, alkynyl, aryl or heterocyc
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