96606-60-9Relevant academic research and scientific papers
REGIOSELECTIVITE DE LA CYCLOADDITION DIPOLAIRE-1,3. REACTIONS DE DIBENZO-2,3:6,7 HEPTAFULVENES AVEC QUELQUES DIPOLES
Fichou, D.,Tonnard, F.,Toupet, L.,Carrie, R.
, p. 5121 - 5134 (2007/10/02)
The addition of several 1,3-dipoles, viz. diazoalkanes, parachloro-benzonitrile oxide and azomethine ylides, to 2,3:6,7-dibenzo-heptafulvenes, occurs exclusively at the endocyclic double bond, leading respectively to pyrazolines, isoxazolines and pyrrolidines.This regiospecificity is due to steric factors which are conveniently discussed using Sustmann's variation perturbation theory.
