Conformational properties of cyanomethoxy calix[4]arenes
作者:Crenguta Danila、Volker Böhmer、Michael Bolte
DOI:10.1039/b507780j
日期:——
O-Alkylation of the dinitro calix[4]arene 2, easily available by selective ipso-nitration of the di-cyanomethyl ether 1, with allylbromide (DMF/Cs2CO3) gave tetraethers 3 and 4 with anti- and syn-orientations of the two allyl ether residues. The two possible stereoisomers of in the partial cone and 1,2-alternate conformation exist as an equilibrium mixture which could be quantitatively analysed by