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摘要
3-Phosphorylcyclobutenes undergo a 4-electrocyclic ring opening reaction faster than cyclobutene itself, and afford the corresponding 1,3-dienes with the cis isomer predominating. The accelerating effect and the inward preference of the phosphonate substituents are ascribed to the orbital interaction between the breaking C-C sigma-orbital of the cyclobutene backbone with the P-O sigma* orbitals at the transition state.
- 出版日期2017-2
