Abstract

The reductive cleavage of acetals with borane in tetrahydrofuran was found to be first order in acetal and close to third order in borane. The high order in borane may be due to the participation of three BH3 units in the transition state with subsequent formation of a B2H7− ion. All the hydrogen atoms of borane are available for the reduction of excess acetal at 30 °C.

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