ABSOLUTE CONFORMATION OF METHYL 3-(1,4-DIMETHOXY-9-TRIPTYCYL AND 1,4-DIMETHYL-9-TRIPTYCYL)-3-METHYLBUTANOATE ROTAMERS

The racemates of the rotational isomers of the mother acids of the tit le compounds were resolved via their camphor sultam amides and their a bsolute conformation was determined by X-ray crystallography. The chir optical properties of the methyl esters are correlated with the absolu te conformations. Both of these compounds are shown to possess dextror otatory property at Na D line, if their stereochemistry is Psc.