Porous surfactants from cone conformers of calix[5]arenes

This paper describes the synthesis and monolayer properties of two porous surfactants derived from the calix[5]arene framework that exist as stable cone conformers [i.e., 5,11,17,29,29-pentaformyl-91,92,99,94,95-pentakis(n-octyloxy)calix[5]arene (1a) and an N,N-dimethylthioamide derivative 2a] plus calix[4]arene and calix[6]arene analogs. The introduction of 1a, in and of itself, represents a significant advance in the calixarene area because it provides access to a wide-cavity calixarene that is amenable for further modification at its wider rim