A new process for isomerization of donor–acceptor cyclopropanes (2-arylcyclopropanedicarboxylates)
by treatment with anhydrous gallium trichloride to give (2-arylalkylidene)malonates
in high yields and with good selectivity has been developed. The reaction involves
initial formation of a 1,2-dipolar gallium complex.
Key words
donor–acceptor cyclopropanes - cyclopropanedicarboxylates - gallium trichloride -
isomerization - 1,2-dipole - alkylidenemalonates