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The catalyst-free hydrosilylation of CO 2 under mild conditions remains limited. Herein, we report the synthesis, characterization, and reactivity of 5,10,15,20-tetraphenylporphyrinato(dihydrido)silicon(IV)(1)a sas ix-coordinate silicon dihydride. The Si-H moiety of 1 reacts with polar double bonds and CO 2 in the absence of ac atalyst to afford hydrosilylated products. Combining the hydrosilylation with subsequentt ransformation furnishes formic acidf rom CO 2 .C omputational studies indicate that the hydride-donorp roperties of 1 are exceptionally high for an eutrals ilicon hydride, and that the directh ydride transfer from silicon to carbon is ap ivotal step in the hydrosilylation of CO 2 with 1.

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