| http://www.w3.org/ns/prov#value | - (a) The reaction of a compound of the formula II in which Z is a suitable leaving group, for example hydrocarbylsulphonyl such as (1-6C)alkylsulphonyl (such as methylsulphonyl or ethylsulphonyl), arylsulphonyl (such as phenylsulphonyl), aryloxy such as phenoxy or halogeno (such as chloro or bromo), with a compound of the formula III.
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