𝔖 Bobbio Scriptorium
✦   LIBER   ✦

Will the real β-pinene please stand up

✍ Scribed by William B. Smith

Publisher
John Wiley and Sons
Year
1994
Tongue
English
Weight
278 KB
Volume
32
Category
Article
ISSN
0749-1581

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✦ Synopsis

Abstract

In the past year, two complete analyses of the proton NMR spectrum of β‐pinene have appeared from different laboratories. The assignments of the chemical shifts to the protons on carbon‐3 were consistent in both studies although there was disagreement in the values assigned to the coupling constants associated with these protons. A molecular modeling study shows β‐pinene to exist in a single conformation. The proton spectrum has been re‐examined with the aid of the Ag(fod)–Yb(fod)~3~ reagent, and the coupling constants redetermined. The results are consistent with the modeling results and confirm that the existing assignments for the C‐3 protons should be reversed.

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