The transformation of phenylethyl chloride to 3,4-dihydroisoquinolines is shown to proceed via phenonium ion. The evidence comes from a study of dideuterated analogue 4, and the monomethylated and dimethylated compounds 2 and 3.
TERADA, AKIRA, MEM. KYUSHU INST. TECHNOL., 1980, N 10, 41-51