The complex formation of 1,1'-binaphthyl-2,2'-dicarboxylic acid (BNDA) with dimethyl sulphoxide (DMSO) at different temperatures was investigated. The crystal structures of the aand b-form [triclinic, P1, a = 9.614(2), b = 11.743(2), c = 12.029(2) A ˚, a = 99.35(3), b = 93.58(3), = 110.51(3)°, V = 1
The structure of trisformamidomethane in dimethyl sulphoxide-d6, hexamethylphos-phortriamide and trifluoroacetic acid
✍ Scribed by W. L. F. Armarego; Toshihiko Kobayashi
- Publisher
- John Wiley and Sons
- Year
- 1970
- Tongue
- English
- Weight
- 294 KB
- Volume
- 2
- Category
- Article
- ISSN
- 0749-1581
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✦ Synopsis
Abstract
The PMR spectrum of trisformamidomethane in dimethyl sulphoxide‐d~6~ and hexamethyl‐phosphortriamide has been explained by postulating four major structures in solution: two rotamers and two structural isomers, all of which are stabilized by intramolecular hydrogen bonding to form six membered rings. The spectrum in trifluoroacetic acid is also described.
📜 SIMILAR VOLUMES
We have observed that the benzene-induced solvent shifts ofcertain methoxyl groups in the NMR spectra of isoflavones are appreciably changed by the addition of a small amount of trifluoroacetic acid to the solution of the isoflavones in a 1: 1 mixture of chloroform and benzene. The methoxyl group at
## Abstract The reaction affords the products with excellent yields under mild conditions and does not require any prior activation.