Abstract
The mixed-metal sulfide cubane-type cluster complex [PdMo 3 S 4 (tacn) 3 Cl][PF 6 ] 3 ( 1 ; tacn = 1,4,7-triazacyclononane) was found to be a highly efficient and selective catalyst for the addition of carboxylic acids to acetylenes with electron-withdrawing groups. The corresponding trans addition products were exclusively obtained in good yields under mild reaction conditions in the presence of a catalytic amount of triethylamine. Addition of carboxylic acids to electron deficient acetylenes catalyzed by the PdMo 3 S 4 cubane-type cluster gave exclusively Z-vinyl esters in good yields.
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