| http://www.w3.org/ns/prov#value | - (where Y' is a group Y or R4 or a protected group Y or R4, R2' R3' are as hereinbefore defined and Lv is a leaving group for example a halogen atom, e.g. bromine or chlorine or a tosylate group and p is as hereinbefore defined) and if necessary subsequently removing any protecting groups used; and
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