But-l-enyl acetate

Compound (23) (Expt 8.8) is formed by the reaction of but-l-enyl acetate with chlorosulphonyl isocyanate (Section 4.2.17, p. 425).13 The reaction intermediate is the IV-chlorosulphonyl derivative which is subjected to reduction with alkaline sodium sulphide to yield the product which is isolated as a cis trans (1 1) mixture. But-l-enyl acetate is readily synthesised by acetylation of the enol form of butanal. 

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