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Current Investigations in the Synthesis
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acetic acid acid chloride alkylation aqueous band benzene Calcd carbon carbonyl Chart Chem chloroform colorless cooled Crystallization cyclization derivative dike tone diketo ester diketone distillation double bond dried over sodium dry benzene eluted enol lactone ethyl acetate evaporated filtrate heated under reflux hydrochloric acid hydrogenation hydrolysis infrared spectrum intermediate Isomer ketal ketal acid ketone group lactone layers were washed LXXIX LXXVIII LXXX methanol methyl group millimoles mixture mole neutral product nitrogen atmosphere obtained oxalyl chloride potassium hydroxide present reaction recrystallized reduction ring sodium borohydride sodium hydride sodium sulfate solid steroids structure tetracyclic tetracyclic dike tetracyclic diketone total synthesis total yield tricyclic ketone triketone Tyner ultraviolet ultraviolet spectrum unsaturated ketone W. S. Johnson washed with water Xmax