Chemistry of keto acetals: III. Stereochemical features of the addition of triethyl orthoformate to 6-(diethoxymethyl)-1-trimethylsiloxycyclohexene
摘要:
Stereochemistry of the addition of triethyl orthoformate to 6-(diethoxymethyl)-1-trimethylsiloxycyclohexene has been studied. The reaction yields a mixture of isomeric 2,6-bis(diethoxymethyl)cyclohexanones with diequatorial and axial/equatorial orientations of the acetal fragments, the latter prevailing. The stereochemistry of the addition is determined by the transition state structure rather than by thermodynamic stability of the resulting keto diacetal.
Chemistry of keto acetals: III. Stereochemical features of the addition of triethyl orthoformate to 6-(diethoxymethyl)-1-trimethylsiloxycyclohexene
摘要:
Stereochemistry of the addition of triethyl orthoformate to 6-(diethoxymethyl)-1-trimethylsiloxycyclohexene has been studied. The reaction yields a mixture of isomeric 2,6-bis(diethoxymethyl)cyclohexanones with diequatorial and axial/equatorial orientations of the acetal fragments, the latter prevailing. The stereochemistry of the addition is determined by the transition state structure rather than by thermodynamic stability of the resulting keto diacetal.