Hydrogenation Of Thiophene Research Articles

Influence of added salts and acids on the ionic hydrogenation of thiophenes

1. The ionic hydrogenation of thiophenes is greatly accelerated by a large excess of trifluoroacetic acid or small quantities of p-toluenesulfonic acid or neutral salts (lithium perchlorate and lithium tosylate). 2. In the hydrogenation of 2-ethylthiophene use of excess CF3COOH or addition of p-toluenesulfonic acid or LiClO4 not only accelerates the reaction but also increases the yield of 2-ethyltetrahydrothiophene.

Accelerating effect of boron trifluoride etherate on ionic hydrogenation of thiophenes

Accelerating effect of boron trifluoride etherate on ionic hydrogenation of thiophenes

ChemInform Abstract: STUDIES ON THE HEXAGONAL HYDRATE OF MOLYBDENUM TRIOXIDE, THE PHYSICAL PROPERTIES OF THE HYDRATE AND ITS CHANGES ON HEAT TREATMENTS IN AIR, IN HYDROGEN, AND IN A HYDROGEN‐THIOPHENE MIXTURE

AbstractDas hexagonale Hydrat von Mo‐trioxid wird röntgenographisch, IR‐ und NMR‐spektroskopisch untersucht.

Studies on the Hexagonal Hydrate of Molybdenum Trioxide. The Physical Properties of the Hydrate and Its Changes on Heat Treatments in Air, in Hydrogen, and in a Hydrogen–thiophene Mixture

Abstract The hexagonal hydrate (I) of molybdenum trioxide, which has been newly found and reported, was studied by X-ray diffraction analysis, IR and NMR spectroscopies, and by other methods. Also studied was the change in (I) on heat treatments in air, in hydrogen, and in a hydrogen–thiophene mixture. The crystal was found to belong to a hexagonal system. The air-dried sample has about 0.46 mol of water. This water is included as a water molecule, not as hydroxyl. By the dehydration of (I), anhydrous molybdenum trioxide (I′), which has the same crystal structure as (I), is obtained. Another new form of (I′) is the hexagonal trioxide, which is hygroscopic and which easily absorbs water when standing in air. This (I′) is metastable and is irreversibly transformed to rhombic molybdenum trioxide(II) at 420–430 °C. In hydrogen and in a hydrogen-thiophene mixture, reduction and sulfurization occur in addition to transformation, which can be shown schematically as: (Remark: Graphics omitted.). Transformation in hydrogen and in the hydrogen–thiophene mixture proceeds faster than in air. Reduction occurs more quickly in the hydrogen–thiophene mixture than in hydrogen.

Ionic hydrogenation of thiophenes

Abstract A new method of synthesising thiophane compounds by hydrogenation of the corresponding thiophenes with a mixture of triethylsilane and trifluoroacetic acid is described. A number of thiophanes, such as 2-, 3-alkyl-, arylthiophanes, 2,5-dimethylthiophane, thiophanes functionally substituted in the side chain and thiaindanes have been obtained by this method.

New noncatalytic method for hydrogenation of thiophenes to thiophanes

New noncatalytic method for hydrogenation of thiophenes to thiophanes