Tetrahedron Letters p. 4673 - 4676 (1985)
Update date:2022-08-05
Topics:
Uncuta, Cornelia
Balaban, Teodor-Silviu
Gheorghiu, Mircea D.
Stanescu, Ligia
Petride, Aurica
Balaban, Alexandru T.
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 shows to the LSR a t-butyl-like face.
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