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The rotational energy barriers of some symmetrical N-nitroso compounds (NNGs) (N-nitrosodimethylamine, N-nitrosodiethylamine, N-nitrosodiphenylamine and N-nitrosocarbazole) were calculated using the MNDO method. The calculated values are consistent with the experimental values. In addition, predictive calculations of the rotational energy barriers of some asymmetric NNCs (TV-nitrosomethyl-2-oxopropylamine and N-nitrosoethylmethylamine) for which no experimental values are available were carried out using the MNDO method. The significance of the rotational barriers in carcinogenesis is discussed. © 1993.
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