Readily accessible 6,7-dichloro-1,4-dioxaspiro[4.4]non-6-en-8-one was converted into 2,3-dichloro-, 2-ethylthio-, and 3-chloro-2-ethylthio-4-hydroxy-2-cyclopentenones.
Readily accessible 6,7-dichloro-1,4-dioxaspiro[4.4]non-6-en-8-one was converted into 2,3-dichloro-, 2-ethylthio-, and 3-chloro-2-ethylthio-4-hydroxy-2-cyclopentenones.
Reaction of a number of 3-N-, O-, S-, Cl-, and alkyl-substituted 2-chloro-4,4-ethylenedioxycyclopent-2-en-1-ones with Zn in NH4Cl-MeOH medium were investigated. The expected or partially transformed dehydrochlorination products were isolated. An exclusive chemical stability of 3N-containing cyclopentenones was disclosed. This phenomenon was understood as originating from stabilizing n-d-p-interaction of electrons belonging to heteroatoms in the planar C ' (O)-C-2(Cl)-C-3(N) fragment contained in the molecules of the compounds.