The H-1 and C-13 NMR spectra of the new calix[4]arene-based tetraketone were completely assigned by one- and two-dimensional homo- and heteronuclear experiments (H-1-H-1 COSY, H-1-C-13 HMQC, and HMBC) at 400 and 100 MHz, respectively, at 25 degrees C standard pulse sequence. I H and 13C spectra were measured at room temperature for 25,26,27,28-tetramethylcalix[4]arene tetraketone (1). C-13{H-1}, DEPT and NMR techniques were used to distinguish the methyl, methylene and methine carbon resonance signals of calix[4]arene 1. Correlation of 1D (H-1, C-13{H-1}, DEPT) and 2D (HMQC and HMBC) NMR data was used to completely assign various overlapping and broad signals of calix[4]arene 1. Heteronuclear multibond correlation (HMBC) studies were used to completely assign various carbon resonances. Our results show that the conformation of calix[4]arene 1 in the solution is very similar to the cone conformation reported in the literature. (C) 2009 Elsevier B.V. All rights reserved

Similar works

Full text


Pamukkale Üniversitesi Açık Erişim Arşivi

Provided original full text link
oaioai:acikerisim.pau.edu.tr:11499/13066Last time updated on 9/5/2019

Having an issue?

Is data on this page outdated, violates copyrights or anything else? Report the problem now and we will take corresponding actions after reviewing your request.