Related Experiment Video
Updated: Jul 13, 2026

Preparation of Stable Bicyclic Aziridinium Ions and Their Ring-Opening for the Synthesis of Azaheterocycles
Published on: August 22, 2018
Valence isomer of a beta-diketiminate-supported phosphinidene: a case of C-H activation and ring contraction
Zheng Lu1, Michael Findlater, Alan H Cowley
1Department of Chemistry and Biochemistry, The University of Texas at Austin, 1 University Station A5300, Austin, Texas 78712, USA.
Abstract:
A valence isomer of a beta-diketiminate-supported phosphinidene has been prepared by potassium metal reduction of the corresponding chlorophosphenium cation.
Related Concept Videos
ortho–para-Directing Activators: –CH3, –OH, –⁠NH2, –OCH3
Thermal Electrocyclic Reactions: Stereochemistry
Selection Rules: Thermal Activation
Conjugated systems containing an even number of π-electron pairs undergo a conrotatory ring closure. For example, thermal electrocyclization of (2E,4E)-2,4-hexadiene, a conjugated diene containing two π-electron pairs, gives trans-3,4-dimethylcyclobutene.
Photochemical Electrocyclic Reactions: Stereochemistry
Selection Rules: Photochemical Activation
[4+2] Cycloaddition of Conjugated Dienes: Diels–Alder Reaction
Stereoisomerism of Cyclic Compounds
[3,3] Sigmatropic Rearrangement of 1,5-Dienes: Cope Rearrangement

