prov:value
| - When R' is aliphatic, it is preferably alkyl, such as methyl, ethyl, n-propyl, i-propyl, n-butyl, tert-butyl, --C.sub.8 H.sub.17, and the like; or alkylsubstituted with a non-interfering substituent, such as halogen, alkoxy or nitro.When R' is aromatic, it typically contains from about 5 to about 14 carbon atoms, preferably about 5 to 12 carbon atoms and, optionally, can contain one or more rings
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