| http://www.w3.org/ns/prov#value | - (wherein X and Z are as hereinbefore defined) are similarly suitable as starting compounds and can be prepared, in principle, in the same way, but with the exclusion of basic condensation agents, from epoxides such as epichlorohydrin, epibromohydrin and 2,3-epoxypropylbenzenesulphonate, toluenesulphonate, 4-bromo-benzenesulphonate or methanesulphonate.
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