ABSOLUTE-CONFIGURATION AND CONFORMATION OF 1,1' 4',1''-TERNAPHTHALENECOMPOUNDS AS DETERMINED BY X-RAY CRYSTALLOGRAPHY/

The absolute stereochemistry of chiral 1,1':4',1 ''-ternaphthalene com pounds was determined by the Xray crystallographic structure analysis of chiral dichlorophthalic acid amide ester (5b) of 1,1':4',1 ''-ter-n aphthalene-2,2 ''-dimethanol (1); the (aS,aS) configuration of ester 5 b was doubly established by calculating the anomalous scattering effec t of heavy atoms, and also by using the campharsultam moiety as an int ernal standard of absolute configuration. The dihedral angles between naphthalene chromophores were determined to be around 90 degrees by X- ray analyses of ester (aS,aS)-5b and glycol (aS,aS)-1.