A final point of interest is an increase at long irradiation times (> 12 h) of the yield of Me3COSiMe3 and a concomitant decrease in the yield of Me3SiSiMe3. Trapping experiments with labeled alcohol indicate that photolysis of hexamethyldisilane is another route to 2-methyl-2-silapropene. This has also been observed by Boudjouk and Koob in the gas phase.12 Me3SiSiMe3 + hv-* Me3SiH + CH2=SiMe2Acknowledgments. We thank Professor Thomas J. Barton for stimulating discussions of this problem and for helpful suggestions; we also thank Mr. Daniel Graham for mass spectrometric analyses. Financial support from the Department of Energy is gratefully acknowledged. This is technical report COO-1718-78. References and Notes

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Beweise für eine Disproportionierung von photolytisch aus Bis‐[trimethylsilyll‐Hg‐ Dampf erzeugten Trimethylsilyl‐Radikalen zu Tiimethylsilan und Me2Si=CH2 werden mitgeteilt.