Hydrocarbalkoxylation of Styrene,Catalyzed by a Palladium Complex of Dibenzylideneacetone in the Presence of Bronsted Acids

摘要

The effect of the compositon of the catalytic systemPd(dba)_2 HX/8 Ph_3P (dba is dibenzyl-ideneacetone) on the yield and ration of the regioisomeric products of teh reaction of styrene with CO and BuOH n dioxane was studied.In comparable conditions,the catalytic activity varies in the order: X=ClO_4>= CF_3SO_3 reversible TsO reversibleCl BF_4 CF_3COO. At X=ClO_4,TsO,and CF_3SO_3,increase in the selectivity of the process in butyl 3-phenylpropanoate is observed at the same or increased catalytic activity.The varied selectivity of teh catalytic systems is explained in terms of formation of cationic palladium hydride intermediates.