Searching for zwitterionic intermediates in Hetero Diels–Alder reactions between methyl α,p-dinitrocinnamate and vinyl-alkyl ethers

Revisiting oxime–nitrone tautomerism. Evidence of nitrone tautomer participation in oxime nucleophilic addition reactions

Oxime–nitrone tautomerism takes place through a biomolecular mechanism. Participation of nitrone tautomer in nucleophilic addition reactions is evidenced by the first time.

A polar nature of benzoic acids extrusion from nitroalkyl benzoates: DFT mechanistic study

Using DFT calculations at various theory levels, quantum-chemical simulations of decomposition paths were performed for a series of nitroalkyl benzoates. It was discovered, that these reactions proceed via polar, but one-step mechanism. It turned out that depending on the nature of the substituent in the ester molecule and on medium polarity, the studied reactions may take place via transition states with varied synchronicity—from E1-like structures, to E1cb-like structures. A purely ionic, two-stage mechanism was not identified in any of the cases.

Study of the Diels–Alder and retro-Diels–Alder reaction between furan derivatives and maleimide for the creation of new materials

This study showed a way to increase the endo/exo ratio in favor of the endo adduct in furan derivatives/maleimide systems.

S. Cordeiro MN. Simple descriptors for assessing the outcome of aza-Diels–Alder reactions

Taft’s constants are important descriptors for predicting the outcome of aza-Diels–Alder reactions, correctly reproducing the results from DFT calculations.

Ionic Diels–Alder reaction of 3-bromofuran toward the highly electron deficient cyclobuteniminium cation: a regio- and stereoselectivity, and molecular mechanism study using DFT

The ionic Diels–Alder reaction between 3-bromofuran and cyclobuteniminum cation in the presence of chloroform takes place in a complete regio- and stereoselective manner via a non-concerted two-stage one-step molecular mechanism.