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1H NMR Chemical Shifts and Coupling Constants of Some 3-Monosubstituted 2-Methylpropenes

✍ Scribed by Roberto Rittner; Mara E. F. Braibante; Dora G. de Kowalewski; Juan Carlos Pla; Eugene P. Mazzola

Publisher
John Wiley and Sons
Year
1997
Tongue
English
Weight
301 KB
Volume
35
Category
Article
ISSN
0749-1581

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✦ Synopsis

1H NMR chemical shifts and proton-proton coupling constants for some 3-substituted 2-methylpropenes Y = H, Cl, Br, I, OH, OMe, OEt, SH, SMe, SEt, and are reported. Reso-[ YCH 2 C(Me)CH 2 , N M e 2 NEt 2 ] nances of the oleÐnic protons were assigned through lanthanide-induced shifts. Chemical shifts of the oleÐnic protons and showed a dependence on the substituent at C-3 of the allylic fragment. Long-range allylic (H A H B ) coupling constants for and and and Me ; for and and and Me) were (4J cisoid H A CH 2 H B 4J transoid H B CH 2 H A determined by spectral expansion and simulation.

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