✦ LIBER ✦
Hindered internal rotation in methyl n-methyl-n-aryl-sulfonylmethylcarbamates and related carbamates. The long-range shielding of the ester methyl group by an aromatic ring.
✍ Scribed by S.van der Werf; J.B.F.N. Engberts
- Publisher
- Elsevier Science
- Year
- 1968
- Tongue
- French
- Weight
- 195 KB
- Volume
- 9
- Category
- Article
- ISSN
- 0040-4039
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✦ Synopsis
Recently we reported that the NMR spectra of the alkyl N-methyl-N-arylsulfonylmethylcarbamates I -III showed only temperature dependence of the signal of the ester alkyl group (1). It was suggested that the barrier to internal rotation merely involved the ester group itself since the data then available CH