Sa. Osadchii et al., UNEXPECTED CONDENSATION OF 3-CHLORO-1,2,3-TRIMETHYL-4-METHYLIDENECYCLOBUTENE WITH 1,2-DIMETHYL-3,4-DIMETHYLIDENECYCLOBUTENE, Russian chemical bulletin, 45(12), 1996, pp. 2807-2809
Condensation of 3-chloro-1,2,3-trimethyl-4-methylidenecyclobutene with
1,2-dimethyl-3,4-dimethylidenecyclobutene under the action of MgBr2 l
eading to spiro compounds was observed. The scheme of the process is d
iscussed.