Studies on the synthesis of heterocyclic compounds. X. Antimony derivatives for the preparation of macrocyclic tetraesters

Treatment of 2-chloro-1,3,2-benzodioxastibole with diacyl chlorides afforded cyclic tetraesters in yields depending on ring size. The exclusive formation of dimeric derivatives was obtained using this method. The products were characterized by analytical and spectroscopic (ir, nmr and ms) data.