trans-1,3-Diethoxy-5,5-dimethyl-1,3-diphospha-5-silacyclohexane-1,3-dione

The title compound, C₉H₂₂O₄P₂Si, is the first 1,3-diphospha-5-silacyclohexane for which an X-ray structure has been reported. It crystallizes with two independent molecules, which are closely similar. The rings adopt a chair conformation with mean absolute torsion angles of 55.67 and 55.21°. Ring bond angles at carbon are wider than ideal tetrahedral, with values in the range 114.09 (11)–118.05 (11)°. There are several C—H...O hydrogen bonds, of which the shortest by far is C2—H2A...O2′, with H...O = 2.25 Å, C...O = 3.236 (3) Å.

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