2‐Hydroxymethyl‐2‐Cyclopentenone

2-Hydroxymethyl-2-cyclopentenone intermediate: 2-Bromo-2-cyclopentenone. intermediate: 2-Bromo-2-cyclopentenone ethylene ketal intermediate: 2-hydroxymethyl-2-cyclopentenone ethylene ketal product: 2-hydroxymethyl-2-cyclopentenone Keywords: acetal (and thioacetal) formation; addition, to CO; Grignard and related reactions; halogenation, bromination; hydrolysis, acetals and ketals; diisopropylamine; 2-lithio-2-cyclopenten-1-one ethylene ketal; benzene