137258-49-2Relevant academic research and scientific papers
Regioselective upper-rim functionalizations of calix[4]arene by diphenylphosphino groups
Gagnon,Veniza,Drouin,Harvey
, p. 1439 - 1446 (2007/10/03)
The regioselective upper-rim functionalization of calix[4]arene have been performed to prepare all the multisubstituted diphenylphosphine derivatives. In addition, the X-ray structures of 5,17-dibromo-11,23-bis(diphenylphosphino)-25,26,27,28-tetra-n-propoxycalix [4]arene and 5,11,17,23-tetrakis(diphenylphosphino)-25,26,27,28-tetra-i-propoxy-calix[4] arene have been determined. Regioselective functionalizations have been achieved using methods that involve appropriate choices of bases, alkyllithium-solvent systems, stoichiometry, and reaction times. A new and convenient method for selectively preparing derivitized calix[4]arenes at proximal positions in relative large scale quantity has been developed and involves a transesterification of the distal diester derivative into the proximal isomer.
Adamantylation of 5-(dialkylaminomethyl)calix[4]arenes
Kovalev,Shokova,Paraskevov
, p. 1464 - 1471 (2007/10/03)
The presence of an aminomethyl group on the upper rim of calix[4]arenes does not prevent their electrophilic adamantylation with 3-substituted 1-adamantanols in trifluoroacetic acid. This reaction provides a synthetic route to new calix[4]arenes containin
Calixarenes. 26. Selective Esterification and Selective Ester Cleavage of Calixarenes
See, Keat Aun,Fronczek, Frank R.,Watson, William H.,Kashyap, Ram P.,Gutsche, C. David
, p. 7256 - 7268 (2007/10/02)
Methods have been developed for converting p-tert-butylcalixarene (1a) in high yield to the 25-monoester 7, the 25,26-diesters 5 and 6, the 25,27-diester 4a, and the 25,26,27-triesters 2 and 3 in which the aryl groups are 3,5-dinitrophenyl moieties.Con
