Abstract 5‐Benzyl‐3‐phenyl‐2‐thioxoimidazolidin‐4‐one underwent thermal dehydrogenation to afford 5‐benzylidene‐2‐thioxoimidaxolidin‐4‐one under microwave and flash vacuum pyrolysis conditions. A high predominance of the Z‐isomer over the E‐isomer of the imidazolidinone product was achieved. By using DFT and NBO calculations, the mechanism of the dehydrogenation and the selectivity were also explored.
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Pepino et al. (2012) studied this question.
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