Abstract
Carbonyls and acetals are converted to 1,3-dithianes and -dithiolanes upon treatment with 2-stanna-1,3-dithianes and -dithiolanes under catalysis by organotin triflates. In these competition reactions, various types of carbonyls and acetals are differentiated. Aldehydes react preferentially over ketones, but the preference is completely reversed in the competition reactions between the corresponding acetals and ketals. The reactivity of aliphatic aldehydes is greater than that of the acetals of aliphatic aldehydes and ketones. Conversely, an aromatic acetal is more reactive than its parent aldehyde. In the competition between aromatic and aliphatic aldehydes, the reaction of the latter predominates
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