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- We were not able to affect the complete conversion of the intermediate acetals to the enol ethers and varying ammount of the acetal (5–15%) was always present as contaminant in the enol ethers even after careful fractional distillation.
- The reported yields of the α- methoxyketones take into consideration the dimethyl acetal content of the enol ether and have been calculated on the basis of either gas chromatographic data or on the PMR basis. The reason for the low yields may be the facile conversion of I to III under acid catalysis.