| http://www.w3.org/ns/prov#value | - (B) Intermediate XIII of (A) wherein C-4 is hydroxy is converted to the appropriate C-4 substituent by reaction with the appropriate acyl chloride acid anhydride or mixed anhydride e.g. acryloyl chloride, benzoyl chloride, cycloalkylcarbonyl chloride, alkyl chloroformate, in the presence of an alkali metal (Li, Na or K) anion of a secondary amine base.
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