Abstract
Low resolution microwave (LRMW) spectra of n-propyl, allyl, n-butyl, iso-propyl and 2-butyl nitrate reveal mixtures of conformational isomers which have been characterized and correlated with conformations observed in ethyl nitrate. Conformers of the three primary esters can be assigned to anti (A; τ 2(NOCC) = 180°) and gauche (G; τ 2(NOCC) ∼ 90°) configurations about the NOCC torsional angle coupled with gauche or anti configurations about τ 3(OCCC) and τ 4(CCCC) for n-propyl and n-butyl nitrate and syn (τ 3(OCCC) = 0°) and skew (τ 3(OCCC = 120°) configurations about τ 3 for allyl nitrate. Isopropyl nitrate exists in a gauche (τ 2(NOCH) ∼ 60°) conformation. Spectra of 2-butyl nitrate are compatible with a similar gauche conformer about τ 2 coupled with staggered configurations about τ 3(OCCC). For each compound all of the observed conformers are approximately equally stable. The LRMW spectra are insensitive to orientation about τ 1(ONOC).
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