Journal
ORGANOMETALLICS
Volume 19, Issue 15, Pages 2891-2895Publisher
AMER CHEMICAL SOC
DOI: 10.1021/om000042w
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Reaction of equimolar amounts of 1,3-di-tert-butyl-2-trimethylstannyl-2,3-dihydro-1H,3,2-diazaborole (1) with a series of alkynes R-1-C equivalent to C-R-2 (2)(a: R-1 = H, R-2 = Ph; b: H, 4-ClC6H4; c: H, 4-BrC6H4; d: Ph, Ph; e: Me, Ph; f: Et, Ph; g: H, n-C4H9; h: Et, Et; i: H, n-C6H13) in the presence of a catalytic amount of [Pd(PPh3)(4)] (2 mol %) regioselectively afforded high yields of the alkenes (Z)-R-1[B]C=C(R-2)SnMe3 (3a-h) ([B] = tBuNCH=CHN(tBu)B] as the result of a cis-addition of the BSn bond of 1 to the acetylenic triple bond of 2. Spectroscopic evidence and X-ray structural analyses of 3a and 3f revealed that the bulky borolyl unit was added to the least sterically hindered end of the CC multiple bond.
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