Carbon-13 NMR study of 1-buten-3-yne and its monochloroderivatives
β Scribed by J Kowalewski; M Granberg; F Karlsson; R Vestin
- Book ID
- 103186798
- Publisher
- Elsevier Science
- Year
- 1976
- Weight
- 309 KB
- Volume
- 21
- Category
- Article
- ISSN
- 0022-2364
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π SIMILAR VOLUMES
## Abstract ^13^C NMR data for several 1βsubstituted propβ2βynes and 1,4βbis derivatives of butβ2βyne are reported with full assignments. Substituent effects of βXβaryl groups (X = O, S, NMe, SO~2~) at the propargylic position on the chemical shifts of the acetylenic carbons were determined.
## SYNOPSIS 1,4-Diphenyl-l-buten-3-yne was metathesis polymerized over NbC15-or TaCl5-based catalysts followed by pyrolysis to obtain graphite-like pyropolymers. The brown metathesis polymer, poly( 1,4-diphenyl-l-buten-3-yne), has the structure of fully conjugated backbone and was annealed a t 250
NMR spectra of all-trans retinal, and vitamin A, were measured by the pulse Fourier transform method in CCI,. All peaks in these spectra were assigned from considerations of chemical shifts, half proton-decoupled spectra, spin-lattice relaxation times and induced chemical shift by the addition of sh