Thiophene and derivatives

Oxidative desulfurization of sulfur compounds Oxidation of thiophene and derivatives with hydrogen peroxide using Ti-Beta catalyst... 

This chapter will review synthetic methods for the preparation of thiophenes, benzothiophenes and polycyclic thiophenes. In addition, a survey of the applications of thiophenes and derivatives will supplement the specific discussion included in Chapters 1.04 through 1.16 of this work. 

Table 60 NICS (total) RB3LYP/6-311 -i-G values for thiophene and derivatives ...

Fluorination of thiophene and derivatives and of 1,4-dithiane [241] with KC0F4 gives a series of fluorinated derivatives. Chlorine-fluorine exchange in sulphides is also possible in some cases [242] (Figure 8.86). 

Electrochemical oxidation of thiophene derivatives in methanol at a Pt anode leads to different types of reactions depending upon the electrolytes used. With sodium meth-oxide, 2,5-dimethyl- and tetramethylthiophene [207] afforded 2,5-dimethoxy adducts as a mixture of cisitrcms isomers together with side-chain oxidation products. However, in the presence of sodium acetate, the latter become the main products. In methanol/sulfuric acid solutions, at a carbon anode, thiophene and derivatives [208] oxidations resulted in a ringopening reaction with loss of the sulfur atom, yielding y-dicarbonyl compounds and their... 

Perillene, a monoterpenoid furan derived from p-myreene, is a eonstituent of the essential oil obtained from Perilla citridora (Labiatae) among other monoterpenes, it also occurs in the pheromones of some mites and acts as a defense pheromone of the ant Lasius fulginosus. The isomerie rose furan is a fragrant component of the oil of rose obtained from fresh flowers of Rosa damascena (Rosaceae). 3-(4-Methyl-3-pentenyl)thiophene and derived eyclic tri- and tetrasulfides (1,2,3-trithiepine and 1,2,3,4-tetrathiocine) are found in the oil of hops. 

Hifh thiophene and derivatives With thiophene carboxylic acids ... 

Cu(C,5H26N4)](C104)2 With S heterocyclic ligands With thiophene and derivatives P room gii 2.19 gi = 2.052 71L9... 

The history of reductive desulfurization is more than 70 years old, and the conversion of carbonyl group to methylene and the conversion of thioester to aldehyde are classical examples. The reductive desulfurization of thiophenes and derivatives... 

McLachlan-type spin-density calculations have also been carried out using new HUckel parameters for the d-orbital which were obtained by a restricted Hartree-Fock calculation of thiophen. Good results could be achieved for a large number of sulphur-containing radicals by use of the McLachlan perturbation corrections to the HMO method and the sulphur p-model. In many cases this method has turned out to be an important tool in the assignment of proton hyperfine coupling constants for the e.s.r. spectrum. Studies have involved radicals of thiophens and derivatives, thiaxanthyl radicals, thiapyryl radicals, 1,2-dithiole radicals, substituted 1,2-dithiet radicals and 1,4-dithiin radicals, the... 

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