Conformational Mobility Study in Mono Quinone Derivative of Calix[4]arene by Low Temperature NMR Spectroscopy
Keyword(s):
Cosy Nmr
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: 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.
1973 ◽
Vol 95
(19)
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pp. 6227-6232
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1983 ◽
pp. 1351-1356
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1977 ◽
Vol 25
(1)
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pp. 237-238
1977 ◽
Vol 36
(1)
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pp. 170
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1975 ◽