Abstract

Abstract The gas-phase infrared and liquid-phase Raman spectra of R CO NCO, where R = CH3, CH2Cl, CHCl2 and CCl3, have been recorded. For each molecule an assignment of the observed bands has been proposed in terms of the two planar conformers derived from rotation about the C N bond. The observations indicate that the cisoid conformation is the preferred one in the gas phase while substantial amounts of both cisoid and transoid conformers are present in the liquid.

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