Showing papers on "Ammonium tetrathiomolybdate published in 2002"

Promoting Effect of H2O Addition on C−O Bond Cleavage and Hydrogenation of Dinaphthyl Ether over MoS2 Catalyst in Situ Generated from Ammonium Tetrathiomolybdate

Abstract: Model reactions of 2,2‘-dinaphthyl ether (DNE) were carried out to examine the effects of water addition on C−O bond cleavage and aromatic hydrogenation using MoS2 catalyst in situ generated from ammonium tetrathiomolybdate (ATTM) in a microreactor at 350−425 °C under H2 pressure. The use of ATTM significantly increased DNE conversion at 350−400 °C. Addition of water dramatically increased DNE conversion with ATTM at lower temperature (350 °C). There exists an optimum range of the ratio of added water to ATTM for the catalytic conversion of DNE; too high or too low a H2O/ATTM ratio was found to give the result very similar to the test without water addition. However, water addition alone does not improve conversion of DNE. To clarify the role of H2O, two-step tests were carried out, in which MoS2 catalyst was prepared using ATTM in the presence of tridecane with and without water, and then DNE was added to the reactor and hydrogenated with and without added water. After the preparation of the active MoS2 ...

Michael addition of masked thiolates to conjugated systems in aqueous media promoted by ammonium tetrathiomolybdate

Abstract: Thiolates generated in situ by the action of ammonium tetrathiomolybdate on alkyl halides, thiocyanates and disulfides undergo Michael addition to alpha,beta-unsaturated esters, nitriles :and ketones in water under neutral conditions.