the three stereoisomers. The results of this experiment are recorded in Table IV.Photostationary State Compositions from Irradiations of ltt with Various Triplet Sensitizers. Spectrograde cyclohexane solutions of trans,trarcs-bis(/3-styryl)dimethylsilane (1.0 X 10-2 M) and the various triplet sensitizers (acetone, benzophenone, 1-acetonaphthone, and benzil), each 2.0 X ID-2 M, were placed individually in Pyrex test tubes and irradiated with Pyrex-filtered light until the photostationary states were obtained. Analyses of these solutions by gas chromatography yielded photostationary state isomer compositions tabulated in Table V.Acknowledgment. Support of these studies by the Robert A. Welch Foundation is gratefully acknowledged. P.S.M. would like to thank the Environmental Quality Program at Texas A&M University for funds to purchase gas chromatographic equipment used in these studies.

20) The g factor observed is larger than those of simple alkyl radicals. It is due to the large spin-orbital coupling constant of sulfur atom (£p = 382 cm-1) as compared with that of carbon atom (¿jp = 28 cm-1).

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