What is the product obtained when methyl vinyl ketone is reacted with 1,2-ethanedithiol and the product is further hydrogenated with Raney Nickel? I was solving questions from aldehyde, ketones and ethers and I came across a question that asks:


What is the product obtained when Methyl vinyl ketone is reacted with 1,2-Ethanedithiol and the product is further hydrogenated with Raney Nickel?

My thoughts:

I thought that the reaction could be similar to the one where we react a ketone with ethylene glycol, then on further hydrogenation the double bond breaks. I may be wrong. Any help will be highly appreciated
The answer could be 3 or 4.
1,2-ethanedithiol will react with the carbonyl group to form a dithiane (similar to the ethylene glycol reaction). Reaction of this with Raney Nickel/H2 desulfurises it, so the whole process is effectively a reduction of the carbonyl group to CH2. It depends on the reaction conditions whether the double bond survives. Raney Nickel can reduce alkenes.
You can read more about it here 1 and here 2