𝔖 Bobbio Scriptorium
✦   LIBER   ✦

A comparative study on photosensitized oxidation of trans-2-vinylthiophenes with trans-3-vinylthiophenes

✍ Scribed by Kai Song; Ming-Li Peng; Ming Xu; Li-Zhu Wu; Li-Ping Zhang; Chen-Ho Tung

Publisher
Elsevier Science
Year
2002
Tongue
French
Weight
243 KB
Volume
43
Category
Article
ISSN
0040-4039

No coin nor oath required. For personal study only.

✦ Synopsis

The photosensitized oxidation of trans-2-styrylthiophenes (trans-2-ST), trans-3-styrylthiophenes (trans-3-ST) and trans-1,2-di(2-thienyl)ethylene (trans-2-TE) were investigated using the sensitizers tetraphenylporphyrin (TPP) in a non-polar solvent and 9,10-dicyanoanthracene (DCA) in a polar solvent. The oxidation pathway is dependent on the position of the vinyl substituent in the thiophene ring. While trans-2-ST and trans-2-TE only undergo photooxidation via the singlet oxygen pathway to yield [4+2] and [2+2] products, the photosensitized oxidation of trans-3-ST proceeds exclusively via the superoxide anion pathway to produce the thiophenecarboxaldehyde and benzaldehydes. All of the above substrates may undergo auto-photooxidation via a charge-transfer complex of the substrate and oxygen.

πŸ“œ SIMILAR VOLUMES

Reaction of trans-{PtH2[P(C6H11)3]2} wit
Reaction of trans-{PtH2[P(C6H11)3]2} with carbon disulphide. Kinetic study of the insertion reaction and X-ray structure of trans-{PtH(S2CH)[P(C6H11)3]2}
✍ A. Albinati; A. Musco; G. Carturan; G. Strukul πŸ“‚ Article πŸ“… 1976 πŸ› Elsevier Science 🌐 English βš– 427 KB

## Carbon disulphide inserts into the Pt-H bond oj trans-{PtH,[P(C~,1)3]2} to give trans-{PtH(S,CH) [P(CJ113J2}. The X-ray structure shows that the -S2CH group is bonded to the metal through a sulfur atom as a monodentate thioformate anion. The kinetics of the carbon disulfide insertion have been in

A comparative study of oxidation of meth
A comparative study of oxidation of methanol on -Al2O3 supported group IB metal catalysts
✍ M.J. Lippits; R.R.H. Boer Iwema; B.E. Nieuwenhuys πŸ“‚ Article πŸ“… 2009 πŸ› Elsevier Science 🌐 English βš– 570 KB

Results are presented concerning the behavior of alumina supported Cu, Ag and Au (M) catalysts and the effect of addition of Li 2 O and CeO x on the dehydrogenation and oxidation of methanol. The g-Al 2 O 3 used is able to dehydrogenate methanol to formaldehyde and the addition of a metal to the sup

X-ray crystallographic and NMR structura
X-ray crystallographic and NMR structural studies of trans-2,3-dichloro-5-ethyl-2,3-dihydrothieno[2 3-b]pyridine syn-1-oxide reactions of thiophene rings with hypochlorite reagents
✍ Leroy H. Klemm; Timothy J. R. Weakley; Myungok Yoon πŸ“‚ Article πŸ“… 1999 πŸ› Journal of Heterocyclic Chemistry 🌐 English βš– 252 KB

## Abstract X‐ray analysis of a crystalline product obtained by treatment of 5‐ethylthieno[2,3‐__b__]pyridine with excess acidified hypochlorite establishes its stereochemistry as __trans__‐2,3‐dichloro‐5‐ethyl‐2,3‐dihydrothieno‐[2,3‐__b__]pyridine __syn__‐1‐oxide (5), wherein the pyridine ring is

A comparative study of coprecipitated Ba
A comparative study of coprecipitated BaCO3/La2On(CO3)rn catalysts for the oxidative coupling of methane
✍ Unni Olsbye; Guy Desgrandchamps; Klaus-Joachim Jens; Stein Kolboe πŸ“‚ Article πŸ“… 1992 πŸ› Elsevier Science 🌐 English βš– 495 KB

A comparative study of coprecipitated BaC03/La2On(C03)m catalysts for the oxidative coupling of methane Unni Olsbye (a)\*, Guy Desgrandchamps (a), Klaus-Joachim Jens Co) and Stein Kolboe (c) (a) Elf Aquitaine,