Sulfur monoxide instability

Any attempt to separate the two components by the usual chromatographic methods failed owing to the instability of the thiirane oxides, which easily lose sulfur monoxide to give the corresponding olefins152. 

Sulfur ligands, 633-655 coordination ability, 516 Sulfur monoxide metal complexes instability, 636 Superoxide dismutase, 773 copper complexes, 772 Superoxo complexes, 315-330 binuclear, 323, 325 reactions, 330 bridged... 

Lower Oxides. Despite the instability of SO, S20, and S202, all can be trapped as ligands. Sulfur monoxide gives bent MSO groups and in addition can have jn2, ju.,172, and pi bridging modes. 

Facile isocyanide insertion reactions into metal-carbon, -nitrogen, -sulfur, -oxygen, - hydride, and - halide bonds have been found to readily occur. The insertion into metal-hydrides to give stable formimidines is particularly noteworthy since corresponding formyls (—CHO) are exceptionally difficult to synthesize and tend to be very unstable. There is a great deal of interest in carbon monoxide reductions, and the instability of the intermediate reduction products has made a study of the reduction process extremely difficult. Recently, however, the interaction of isocyanides with zirconium hydrides has allowed the isolation of the individual reduction steps of the isocyanide which has provided a model study for carbon monoxide reduction (39). 

Treatment of (45) with one equivalent of w-chloroperbenzoic acid gave monoxide (46) (mp 135.3-137.3°C) in 35% yield (Equation (10)) <72JOC2367>. Reaction with two equivalents of oxidizing agent gave only sulfur and 3,4-diphenylthiophene due to the instability of (45) <72JOC2367>. 

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