prov:value
| - ntly are hydrogen, alkyl, alkenyl, aryl or aralkyl; R11 is alkyl, alkenyl or aralkyl; R8 and R9 independently are hydrogen or C1???C4 alkyl; R5 and R12 independently are alkyl, alkenyl, aryl or aralkyl; and X is a suitable leaving group capable of being displaced by the nitrogen or the sulfur of a thioamide group, e.g., iodide, bromide, chloride, tosylate, mesylate or triflate.
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