The cycloaddition reactions of nitroethene to (Z)-N-aryl-C-phenylnitrones lead to mixtures of stereoisomeric cis- and trans-2-aryl-4-nitro-3-phenylisoxazolidines. Regioselectivity of these reactions is determined by the character of nucleophile–electrophile interactions, while stereoselectivity is determined by the steric factors and the character of secondary orbital interactions.
硝基乙烯与(Z)-N-芳基-C-苯基亚硝酮的环加成反应导致产生顺式和反式2-芳基-4-硝基-3-苯基异噁唑啉的立体异构物混合物。这些反应的区域选择性由亲核-电泳子相互作用的性质决定,而立体选择性由立体因素和二次轨道相互作用的性质决定。