Abstract
Abstract Molecular structures are proposed for the two conformers, s- cis and gauche , existing for 3-butenenitrile and 3-methyl-3-butenenitrile, and for the three predicted conformers of 2-methyl-3-butenenitrile, using structural parameters transferred from related molecules. The proposed structures for the two conformers of 3-butenenitrile have principal moments of inertia which agree well with experimental values obtained by microwave spectroscopy, except for the gauche I A moment. The experimental value of I A for the gauche conformer of 3-butenenitrile could only be determined at the time with a low degree of precision, hence the microwave spectrum of this conformer should probably be reexamined.
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