Orbital interactions through space I. A new reaction probe for investigating the electronic requirements of [Π4s + Π2s] pericyclic reactions.

Orbital interactions through space (II).

Orbital interactions through space (II). A perturbational mo treatment of substituent effects on a [Π4S + Π2S] pericyclic reaction.

✍ Michael N. Paddon-Row 📂 Article 📅 1972 🏛 Elsevier Science 🌐 French ⚖ 228 KB

In the previous letter we reported the effect of substituents on the rate of 154s + ,,2s3 reactions of the cyclobutene (I) with 3,6\_di(2\*pyridyl)-8-tetrazine (II), a diene having inverse electron demand. Whereas the g-methoxycompound [Ia] reacts faster than the unsubstituted compound (Ib) by a fac