Heptakis(2,6-di-O-benzyl)-beta-CD (I), heptakis(2,6-di-O-benzyl-3-O-pe
ntyl)-beta-CD (II), heptakis(2,6-di-O-benzyl - 3-O-methyl)-beta-CD (II
I) and heptakis(2,6-di-O-benzyl-3-O-acetyl)-beta-CD (IV) derivatives w
ere synthesized and identified. Their thermal stabilities were tested
using PyGC. These CD derivatives are stable up to 300 degrees C and su
itable for use as gas chromatographic stationary phases. The fused sil
ica capillary columns coated with heptakis (2,6-di-O-benzyl-3-O-methyl
)-beta-CD and heptakis(2,6-di-O-benzyl-3-O-pentyl)-beta-CD showed exce
llent chromatographic properties in separating positional isomers.