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that obtained by P h i l i p ~ e . ~The thionitrite is susceptible to decomposition due to light and heat, but with careful handling it can be subjected to quantitative glpc analysis using a silicone 550-stearic acid column operated a t 30". At higher temperatures decomposition to NO and disulfide occurs on the column. The pure substrate photolysis was examined in a conventional grease-free vacuum system with a filtered medium-pressure Hg arc (A >2300 A). The products at decompositions
