The thermolysis of two bulky 1-phosphaallenes in the solid state afforded diphosphanylidenecyclobutane or 2,4-dimethylene-1,3-diphosphacyclobutane. The regioselectivity of the [2+2] dimerization depends largely on the crystal structure of the 1-phosphaallenes, and the reaction path seems to be affected by the presence of bulky 2,4,6-tri-tert-butylphenyl (Mes*) group. This topochemical reaction was also controlled by the substituents at the 3-position of the 1-phosphaallene skeleton.
- Solid-state reactions
ASJC Scopus subject areas
- Physical and Theoretical Chemistry
- Organic Chemistry