(R)-(+)-[VCD(-)984]-4-Ethyl-4-methyloctane: A Cryptochiral Hydrocarbon with a Quaternary Chiral Center. (1) Synthesis of the Enantiopure Compound and Unambiguous Determination of Absolute Configuration
Enantiopure (R)-(+)-[VCD(-)984]-4-ethyl-4-methyloctane (1), a cryptochiralhydrocarbon with a quaternarychiralcenter, was synthesized by the use of 2-methoxy-2-(1-naphthyl)propionate (MaNP) and (-)-camphorsultam dichlorophthalic (CSDP) acid methods. The diastereomeric MαNP and CSDP acid esters prepared from racemic 2-butyl-2-methyl-1-tetralols, were effectively separated by HPLC on silica gel, and