Borane carbonyl is the inorganic compound with the formula H3BCO. This colorless gas is the adduct of borane and carbon monoxide. It is usually prepared by combining borane-ether complexes and CO. The compound is mainly of theoretical and pedagogical interest. It reacts with aqueous base to give boranocarbonate H3BCO22−. Bond distances are B−C, 1.529; C−O, 1.140; 1.194 Å. The H−B−H angle is 113.7°. The CO vibrational band is at 2165 cm−1, 22 cm−1 higher than that of free CO.
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