Abstract
Thermolysis of an overcrowded tin-containing four-membered boracycle, 1,3,2-dithiastanna-boretane derivative 6, bearing an extremely bulky aryl group, 2,4,6-tris[bis(trimethylsiyl)methyl]-phenyl (Tbt), on the boron atom in the presence of several 1,3-dienes in toluene at 120 °C gave the corresponding diene adducts of an initially formed thioxoborane (Tbt-B=S; 7) together with a trimer of diphenylstannanethione 8. Retro [4+2]cycloaddition of the diene adducts into the thioxoborane 7 is also described.
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