The structure and stereochemistry of some condensation products of pulegone

A 1,4-pyran compound from condensation of pulegone and ethyl acetoacetate

“…4'-Hydroxy-2-mercapto-3-chloro-2',4,6-trimethoxy-6'-methylbenzophenone (4).-Nitrogen was bubbled through a stirred suspension of 2.5 g (0.055 mol) of 11 in 40 ml of methanol at room temperature and 40 ml of 2 A aqueous sodium hydroxide was added in ca. 3 min.…”