Stereochemistry of addition of allylic Grignard reagents to .alpha.,.beta.-ethylenic ketones
摘要:
The stereochemistry of the addition of allylic Grignard reagents, (mainly crotylmagnesium chloride) to various conjugated enones has been investigated and a compact transition state is postulated. For s-cis-enones bearing no bulky substituents, a boat transition state, involving a trans-crotylmagnesium chloride, occurs leading to erythro-1,5-hexadien-3-ols as the major or only product.
The stereochemistry of the addition of allylic Grignard reagents, (mainly crotylmagnesium chloride) to various conjugated enones has been investigated and a compact transition state is postulated. For s-cis-enones bearing no bulky substituents, a boat transition state, involving a trans-crotylmagnesium chloride, occurs leading to erythro-1,5-hexadien-3-ols as the major or only product.