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Reaction of a 2:1 mixture of B(C6F5)3 and tBu3P with syn-gas results in the stoichiometric reduction of CO to give a formyl derivative which reacts further via an epoxy-borate intermediate to capture CO, affording a heterocylic alkoxyborate. Heating the reaction prompts reaction with H2 to give a borane-oxy-borate derivative, the product of C-O bond cleavage.
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Dobrovetsky et al. (2013) studied this question.
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