Reaction of equimolar amounts of diphenylketene with a series of 1g)] regioselectively afforded good yields of the 1,3,2-oxazaborolidines tBuN-CH-(CHdNtBu)C(dCPh 2 )OBX (2a-g). The X-ray structure analysis of 2d revealed an essentially planar fivemembered heterocycle with a long B-O bond and a strong exocyclic BN-π bond.

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