prov:value
| - of 1 to 6; and X and Y may each be 1 to 4 halogen atoms, e.g., chlorine, bromine, or iodine; dialkylamino groups having 1 to 4 carbon atoms; or other groups which confer desirable properties to the product, such as for example alkyl, aryl, nitro, amide, amine, ester, ether, peroxy, hydroxy, alkoxy, aldehyde, ketone, and the like, groups; X and Y may be the same or different and either or both may
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