A novel one-pot procedure for the synthesis of dihydro-1,4-dithiins and dihydro-1,4-dithiepines from the corresponding 1,3-dithiolanes and 1,3-dithianes using o-iodoxybenzoic acid (IBX) in combination with tetraethylammonium bromide (TEAB) is described. The salient features of the protocol include mild reaction conditions, short reaction times and high yields.
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Akamanchi et al. (2005) studied this question.