hydrogen sulfide, giving the transient thioketone or thial, which typically convert to oligomers.

1,2-Dithiols

Compounds containing thiol groups on adjacent carbon centers are common. Ethane-1,2-dithiol reacts with aldehydes and ketones to give 1,3-dithiolanes:
:(HS)2C2H4 + R-CHO -> R-CHS2C2H4 + H2O

Some dithiols

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