The thermodynamic criterion or reversible electron phototransfer correlates with CIDNP effects in sensitized trans-cis photoisome~tion ol fumaronitrile in aoetonirrile. It tallows from CIDNP analysis xhat rhc free radical anion OF FIJITIWOII~~~~~C does no1 undergo geometrial isomerization
The study of microwave-induced nuclear polarization in the sensitized trans-cis isomerization of fumaronitrile
β Scribed by E.G. Bagryanskaya; N.I. Avdievich; Yu.A. Grishin; R.Z. Sagdeev
- Book ID
- 103665746
- Publisher
- Elsevier Science
- Year
- 1989
- Tongue
- English
- Weight
- 604 KB
- Volume
- 135
- Category
- Article
- ISSN
- 0301-0104
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## Abstract ^1^HβNmr was used to measure the rate of __cis__β__trans__ interconversion of __X__βPro bonds in linear and cyclic oligopeptides. __k__(cis β trans) = 2.5 Γ 10^β3^ s^β1^ at 25Β°C was found for the zwitterionic form of HβAlaβProβOH, in good agreement with earlier measurements. Replacement
Proton magnetic resonance ('H NMR) was used to study cis-trans isomerizatiOn in N-methyl-N-(1methylthio-2-propeny1)formamide and N-benzyl-N-(1-methylthio-2-propenyl)fonnamide, two analogs of the thiol form of thiamine. Benzene dilution studies and shift reagent studies were used to make resonance as