Marjani K, Mousavi M, Nahzomi HT, Arazi O, Jafari R. Dynamic NMR and computational study of 5,5-dimethyl-3,4-di-p-tolyl-2-cylopenten-1-one.
SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2011;
79:1798-1802. [PMID:
21684192 DOI:
10.1016/j.saa.2011.05.060]
[Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/09/2010] [Revised: 12/24/2010] [Accepted: 05/20/2011] [Indexed: 05/30/2023]
Abstract
The restricted rotation of p-tolyl moiety in 5,5-dimethyl-3,4-di-p-tolyl-2-cyclopenten-1-one was studied by variable temperature NMR spectroscopy at a temperature range of 218-368 K. A free rotation, in NMR time scale, was observed at temperatures higher than 368 K; while, the rotation froze below 248 K. From dynamic NMR analysis, the Arrhenius energy of activation ΔG‡ was calculated as 56.37 kJ mol(-1). The experimental results were confirmed by theoretical calculation using the density functional theory method B3LYP with basis sets, 6-31G and 6-31+G.
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