prov:value
| - Thus, Y can be, for example, any halogen such as chlorine, bromine, iodine or fluorine; any group containing a silicon nitrogen bond such as Me N- or Et N; any monovalent hydrocarbonoxy group such as methoxy, ethoxy, butoxy, isopropoxy, OCH CH OH or radicals of the formula (OCH CH G where G is an aliphatic hydrocarbon radical of from 1 to 4 carbon atoms, phenoxy, cresyloxy and pionoxy; groups cont
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