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Title: Multiple substituent effects on 13C chemical shifts in phenylstyryl ketones: Applicability of interactive free energy relationship
Authors: Annapoorna, S R
Rao, M Prasad
Sethuram, B
Issue Date: Jul-2002
Publisher: NISCAIR-CSIR, India
Abstract: 13C chemical shifts for 23 mono- and di-substituted phenyl styryl ketones have been determined. The shieldings and deshieldings are compared with previous results for other aromatic derivatives. Correlations of the 13C chemical shifts of vinyl carbons with Hammett σ parameters has been determined to provide a consistent picture of electronic effects transmitted through the carbon framework of the compounds studied. Slopes obtained from such Hammett's plots are termed as ρ, and using these 'ρ' values applicability of interactive free energy relationship to chemical shift values has been tested. The cross- interaction constants qx and qy values for C-α are found to be - 1.02 and -1.20 and for C-β are -1.46 and -1.19.
Page(s): 1341-1345
ISSN: 0975-0975(Online); 0376-4710(Print)
Appears in Collections:IJC-A Vol.41A(07) [July 2002]

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