prov:value
| - logen, or mixtures thereof, alkyl and alkoxy contain for example from 1 to about 25 carbon atoms, and more specifically from 1 to about 10 carbon atoms, such as methyl,ethyl, propyl, butyl, pentyl, and the corresponding alkoxides, aryl can contain from 6 to about 36 carbon atoms, such as phenyl, and the like, halogen includes chloride, bromide, iodide and fluoride.
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