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Letters in Organic Chemistry

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ISSN (Print): 1570-1786
ISSN (Online): 1875-6255

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Letter Article

Conformational Mobility Study in Mono Quinone Derivative of Calix[4]arene by Low Temperature NMR Spectroscopy

Author(s): Elham Hassibi, Saeed Taghvaei Ganjali*, Mohamad Mahmoodi Hashemi, Reza Zadmard and Shahram Moradi Dehaghi

Volume 17, Issue 2, 2020

Page: [101 - 106] Pages: 6

DOI: 10.2174/1570178616666190228130119

Price: $65

Abstract

Calix[4]monoquinone (3) has been synthesized by oxidation of rigid cone conformation of tripropoxy calix[4]arene (2), and conformational characteristics of this molecule have been studied by means of dynamic nuclear magnetic resonance (DNMR) and HH- correlated nuclear magnetic resonance spectroscopy (HH-COSY NMR). On the basis of the data that have been obtained, free Gibbs energy of activation (ΔG#) for quinone ring interconversion process of 3 was determined 12.3±0.05 Kcal/mol by coalescence approximation method.

Keywords: Calix[4]arenes, calixquinones, coalescence temperature, conformational mobility, pseudo flatted cone conformation, flip flopping interconversion.

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