A number of ester families have been shown to have characteristic absorptions in the 10-15 p region. These absorptions are quite constant in wave length for all members of the ester family (ie., esters derived from the same acid). The esters which show such absorptions are those that have unsaturation a& to the ester group. It is postulated that the vibration responsible for the most prominent of the absorptions is an out-of-plane deformation at the ...
