Aminium salts-induced dimerization of α-methylstyrene and 1-aryl-1-phenylethylenes. Solvent effect

Article abstract of DOI:10.1016/0040-4020(96)00838-1

The aminium salts-induced dimerization of α-methylstyrene 1b gives rise depending on the solvent employed to high yields of 1,3,3-trimethyl-1,3,3-trimethyl-1-phenylindane 2b, or 2,4-diphenyl-4-methyl-1-pentene 6b. Several 1-aryl-1-phenylethylenes 1a,c-e afford, instead, cyclodimers 2a,c-e, or 2,5-diaryl-2,5-diphenyltetrahydrofuran derivatives 3a,c-e.