- PREPARATION AND ELECTRON TRANSFER-INDUCED cis-trans ISOMERIZATION REACTIONS OF 1-(5-NITRO-2-FURYL)-, 1-(5-NITRO-2-THIENYL)-, AND 1-(4-NITROPHENYL)-2-R ETHYLENES
-
Mixtures of E- and Z-isomers of 1,2-bis(5-nitro-2-furyl)ethylene (I), 1-(5-nitro-2-furyl)-2-(4-nitrophenyl)ethylene (II), 1,2-bis(4-nitrophenyl)ethylene (III), 1-(5-methoxycarbonyl-2-furyl)-2-(4-nitrophenyl)ethylene (IV), 1-(5-methoxycarbonyl-2-furyl)-2-(5-nitro-2-furyl)ethylene (V) and 1-(5-methoxycarbonyl-2-furyl)-2-(5-nitro-2-thienyl)ethylene (VI) were prepared by the Wittig reaction.These derivatives were isomerized by electron transfer-induced reactions via the radical anion in the CT-complex using aniline as electron donor at 25 deg C in the light or at 80 deg C in the dark.The starting as well as the final E:Z ratio was determined by 1H NMR spectroscopy.In all cases only the cistrans isomerization was observed.
- Prousek, Josef,Hayden, Viktor
-
p. 1675 - 1682
(2007/10/02)
-
- SYNTHESIS AND PROPERTIES OF 5-STYRYL-2-FURANCARBOXYLIC ACIDS
-
5-(4-X-Styryl)-2-furancarboxylic acids (X= H, Br, NO2, COOCH3, (CH3)2N) were prepared by oxidation of the appropriate 5-(4-X-styryl)-2-furaldehydes, or alternatively by alkaline hydrolysis of the corresponding methyl esters.The latter were obtained by rea
- Knoppova, Viera,Beno, Anton,Kovac, Jaroslav
-
p. 2724 - 2728
(2007/10/02)
-