Butadienylboronic esters

Butadienylboronic esters, in Diels-Alder reactionos, 9, 179 7 1 7 2-Butadienyl complexes, in Ru and Os half-sandwiches,... 

E and Z boronic esters (13) and (14) were made easily accessible by bromoboration of acetylene followed by esterification of the resulting dibromoboranes The Pd(0) crosscoupling reaction occurs under mild conditions at room temperature leading to a wide variety of the butadienylboronic esters (15) with all possible combination of configurations of the conjugated double bonds as related in table 1. 

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