Studies on calix(aza)crowns. Part II. Synthesis of novel proximal Doubly bridged calix[4]arenes by intramolecular ring closure of syn 1,3-and 1,2-ω- chloroalkylamides

Article abstract of DOI:10.1016/S0040-4020(98)00112-4

Inherently, chiral calix[4]arenes (9,10) with carboxamidc bridges spanning the proximal positions on the lower rim and 18 achiral counterparts have been synthesized by double intramolecular cyclization of 7b,8b 1,3-and 17 1,2-bis-chloroalkylamides. The co