Indolizine derivatives are obtained by irradiation of 2-benzoyl-N-benzylpyridinium derivatives and dimethyl acetylene dicarboxylate, thus providing a competitive and complementary base- and catalyst-free synthesis. With this method, the first example of a crystallochromic indolizine is presented, whose color in the solid state depends on the out-of-plane torsion of the benzoyl substituent.
                                    吲哚嗪衍
生物是通过辐射2-苯甲酰基-N-
苄基吡啶鎓衍
生物和二甲基
乙炔二
羧酸二甲酯而获得的,因此提供了竞争性和互补性的无碱和无催化剂的合成。用这种方法,给出了结晶变色的
吲哚嗪的第一个例子,其固态的颜色取决于苯甲酰基取代基的面外扭曲。