The twists θ[![[double bond, length as m-dash]](https://www.rsc.org/images/entities/char_e001.gif)
θ(n)–θ(π*)] of the orbitals of the carbonyl group of a series of model substituted ketones reproduce accurately the variation in the c.d. of the n→π* transition of chiral substituted ketones even when the substituents are heteroatoms (F, Cl, SiH3).
M. R. Giddings, E. E. Ernstbrunner and J. Hudec, J. Chem. Soc., Chem. Commun., 1976, 954 DOI: 10.1039/C39760000954
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