The gas-phase thermolysis of arachno-B6HI2 produces predominantly B5H9 and B2H6 in a molar ratio of 2 : 1 via a first-order reaction having Arrhenius parameters which are essentially identical to those reported for the decomposition of the structurally related B5H11; these results imply a mechanism involving elimination of BH3 as the rate-determining initial step in both reactions.

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