Departamento de Química, Universidade Federal de Lavras, Lavras, Brazil - MG -C.P. 303737200-000.
Chem Commun (Camb). 2012 Feb 28;48(18):2433-5. doi: 10.1039/c2cc17180e. Epub 2012 Jan 25.
1,2-Difluoroethane is widely recognised to adopt a lower energy gauche rather than anti conformation; this gauche effect has its origin in hyperconjugation; however, surprisingly the (1)J(CF) coupling constant is not influenced by hyperconjugation; instead, its magnitude changes with the overall molecular dipole.
1,2-二氟乙烷被广泛认为采用低能量的 gauche 构象而不是反式构象；这种 gauche 效应源于超共轭；然而，令人惊讶的是，(1)J(CF)耦合常数不受超共轭的影响；相反，其大小随整体分子偶极矩而变化。
