Janus-type isopropyl groups revealed by 1H-NMR spectra of alkylpyridines with lanthanide shift reagents (LSR) |
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| Authors: | Cornelia Uncuta Teodor-Silviu Balaban Mircea D. Gheorghiu Ligia Stănescu Aurica Petride Alexandru T. Balaban |
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| Affiliation: | 1. Centre of Organic Chemistry-ICECHIM, Bucharest, Roumania;2. Department of Organic Chemistry, Polytechnic Institute Splaiul Independentei 313, 76206 Bucharest, Roumania |
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| Abstract: | Two Isomeric pyridines were designed and prepared : 2-isopropyl-4,5,6-trimethyl-(3) and 2-isopropyl-3,4,6-trimethyl-pyridine (7); the latter, with a buttressed isopropyl, leads to much lower induced shifts by Eu(dpm)3 and Pr(dpm)3 than the former, owing to the conformation in which the Janus-type iPr group how to the LSR a t-butyl-like face. |
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