Evidence is presented that the previously studied Prins and Friedel-Crafts-acetylation reactions of (+)-3-carene (IV) each involve electrophilic attack trans to the cyclopropyl ring to give the products I and IX, having the newly introduced C-4 substituents in an α-orientation. Through oxidation, I and IX were converted to a common intermediate, the ester VI. Analysis of the NMR spectra of the epimeric
有证据表明,先前研究的(+)-3-烯基(IV)的Prins和Friedel-Crafts-乙酰化反应均涉及亲电性反式转移至环丙基环,生成具有新引入的C-4的产物I和IX α方向的取代基。通过氧化,I和IX被转化为共同的中间体,酯VI。通过双解偶联技术对差向异构体酯VI和VII以及酮IX和X的NMR光谱进行分析,可以分别指定4α和4β构型。通过检查
环氧化物XII和XIII的NMR光谱,可以为作业I和IX提供其他支持。