1678-99-5Relevant academic research and scientific papers
TRANSFORMATION OF QUINOLINES AND ANILINES OVER NiMo-Al2O3 CATALYSTS
Perot, G.,Brunet, S.,Canaff, C.,Toulhoat, H.
, p. 865 - 870 (2007/10/02)
The decomposition of nitrogen-containing compounds: 1,2,3,4-tetrahydroquinoline, 6-methylquinoline, decahydroquinoline, orthopropylaniline and 2,6-diethyl,1-aniline, was studied at 623 K, 7 MPa in a continuous flow microreactor over two commercial nickel-molybdenum-alumina catalysts, (HR346 and HR348, Procatalyse).Decahydroquinoline was found to react very rapidly under the conditions of 1,2,3,4-tetrahydroquinoline hydrodenitrogenation.The simultaneous transformations of quinoline and aniline showed that the aniline transformation was inhibited by the quinolines.However the inhibiting effect was much less significant with HR348 which also happens to be more active in aniline transformation.
Catalytic Hydrogenation of Aromatic Hydrocarbons. Stereochemical Definition of the Catalytic Cycle for η3-C3H5Co(P(OCH3)3)3
Bleeke, J. R.,Muetterties, E. L.
, p. 556 - 564 (2007/10/02)
The η3-C3H5Co(P(OCH3)3)3-catalyzed hydrogenations with D2of a series of unsaturated organic molecules, including cyclohexenes, cyclohexadienes, and arenes, have been investigated.Complete cis stereoselectivity was observed in the addition of deuterium to the unsaturated ring systems.When alkyl-substituted arenes were reduced with D2, the hydrogen atoms in the alkyl chains underwent H-D exchange as long as each successive carbon atom in the chain possessed at least one hydrogen atom.Hence, extensive H-D exchange occured in n-alkyl side chains while the tert-butyl side chain was deuterium free.When alkyl-substituted arenes were hydrogenated in the presence of olefins such as 1-hexene, a variety of isomeric alkylcyclohexenes and alkenylcyclohexanes were observed.The relative concentrations of these isomeric species provided information about the relative stabilities of the (olefin)cobalt species in the catalytic cycle.Further mechanistic information was obtained from other competitive reactions, i.e., hydrogenation reactions involving equimolar quantities of two different unsaturated molecules.The proposed initiation steps of the catalytic cycle have been revised on the basis of a study of η3-C8H13Co(P(OCH3)3)3 as a catalyst precursor.The cyclooctenyl-cobalt bond was cleaved by hydrogen early in the reaction, leaving the highly coordinately unsaturated hydride, HCo(P(OCH3)3)2, which is probably the true catalytic species.
