In the following reaction X the major products X and Y, respectively, are: · ABC26OR0619
Subject: Organic Chemistry · Chapter: Reagents, Reaction Mechanisms & Named Reactions · Topic: Reagents, Reaction Mechanisms & Named Reactions – General · Exam: GATE 2000-2022 · Marks: 2 · Difficulty: Medium
In the following reaction 
X 
the major products X and Y, respectively, are:
X the major products X and Y, respectively, are:(a)
and 
and (b)
and 
and (c)
and 
and (d)
and 
and Answer
Answer: B ✓ checked by 4AB · confidence high
The source book printed no answer; this one was worked out and checked — see the explanation.
Explanation
The 2-lithio-2-methyldithiane adds conjugatively to phenyl vinyl sulfoxide (X); refluxing xylene eliminates PhSOH (sulfoxide syn-elimination) to give the vinyl dithiane, and HgCl₂/CdCO₃ hydrolyses the dithiane to methyl vinyl ketone (Y) — pair (b).
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