Enones diborations

Diborination of ot, (3-unsaturated ketones has been reported.142 The diboration of enones with 274 gives 1,4-addition products 275-280 in the presence of a platinum(O) catalyst such as Pt(C2H4)(PPh3)2... 

Diboration of 1,3-Dienes, Allenes, Enones, and Other Unsaturated Molecules. As described previously in the original article, the Pt[0] catalyzed addition of 1,3-dienes with B2pin2 affords various allylboronic esters (eq 4). Reactions using phosphine-based catalysts such as Pt(PPh3)4 stereoselectively produce els -1,4-addition products with Z-configuration for aliphatic and cyclic dienes. The reaction mechanism suggests... 

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