Photoaddition Reaction of Methyl 2,4-Dioxopentanoate with Chloroprene

Abstract

The photoaddition reaction ofmethyl 2,4-dioxopentanoate with chloroprene gave two deMayo type adducts, methyl 3-(I-chlorovinyl)-2,6-dioxoheptanoate and methyl 3-chloro-2,6-dioxo-3-vinyl­ heptanoate. No regio isomers, 4-substituted esters, were observed. The photoadducts were converted to cyclohexenones and the selectivity of photoaddition was discussed.