To our knowledge, others have not considered this explanation for solvent dependence of mHAT rates. This implies that, in the future, other mHAT reactions could also be facilitated by using smaller alcohols as solvents because of decreased steric hindrance in transferring hydride from silane to the transition-metal site during the turnover-limiting step. Of course, the generality of this effect will need to be assessed in each reaction system separately.