The tendency of CO bond lengths to change as a function of the torsional angles at an acetal carbon has been included in a new version of the molecular mechanics program MM 2(82), based on the observed behavior of molecules of this class as indicated by ab initio calculations and experimental structural data. The experimental geometries and energies are reasonably well reproduced.
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Nørskov‐Lauritsen et al. (1984) studied this question.