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G. Aridoss et al. / Spectrochimica Acta Part A 68 (2007) 1153–1163
␥-anti carbon is deshielded remarkably due to increase in elec-
tronegativity of the heterocyclic nitrogen by the introduction
of chloroacetyl moiety. Therefore, in order to substantiate the
abruptchangeincouplingconstantvaluesandchemicalshiftval-
uesfromthecorrespondingparentpiperidoneswehaveproposed
different conformations such as flattened boat (for 8, 12 and 14)
and twist-boat forms (for 9, 10, 11 and 13) for the compounds
under study.
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4. Experimental
All the reported melting points were taken in open capillaries
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worthy absorption levels (reciprocal centimeters) are listed.
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4.1. Synthesis of N-chloroacetyl-2,6-diphenylpiperidin-
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Acknowledgements
We are thankful to Prof. K. Pandiarajan, Head, Department of
Chemistry, AnnamalaiUniversityforthefacilitiesprovided. One
of the authors SK is grateful to University Grants Commission,
New Delhi, India for financial support in the form of Major
Research Project. We also thank NMR Research Centre, IISc,
Bangalore for providing all the NMR facilities to record NMR
spectra.
(d) S. Balasubramanian, C. Ramalingan, G. Aridoss, P. Parthiban, S. Kabi-
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Chem., in press.