12,14-Di(1,3-adamantano)-1,9-dithiacyclohexadecane (1), tri(1,3-adaman
tano)-1,9,17-trithiacyclotetracosane (2), and 1,3-adamantano)-1,2,10,1
1-tetrathiacyclooctadecane (3) have been obtained by intermolecular cy
clization of 1,3-bis(2-bromoethyl)adamantane (4) with thioacetamide us
ing a high-dilution technique. The reaction is concentration-dependent
. The crystal structures of 1, 2, and 3 have been determined by single
-crystal X-ray diffraction.