Mechanism for covalent dimerization of pyridine: [4+2] dimerization, an MP2 investigation

â¿¢All 18 [4+2] channels of pyridine dimerization were fully studied.â¿¢Involvement of N atom in DA reaction causes high barrier height, otherwise the barrier heights are low.â¿¢The regularity obtained in this study is also meaningful for predicting further polymerization of pyridine.â¿¢Compared to [4+2] covalent dimerization of benzene, [4+2] covalent dimerization of pyridine is more easier.