Synthesis of r-1-Ethyl-t-2-methyl-t-3-arylindans

Although there are four possible racemates of the 1-ethyl-2-methyl-3-arylindans ( α, β, γ and δ, only three ( α, β and γ) have been synthesized or obtained from propenylbenzenes with acid reagents. Now we present a synthetic route for the preparation of the δ racemates (r-1-ethyl-t-2-methyl-t-3-arylindans), and 13C n.m.r. chemical shifts for the four racemates .