Selective and unexpected transformations of 2-methylpropane to 2,3-dimethylbutane and 2-methylpropene to 2,3-dimethylbutene catalyzed by an alumina-supported tungsten hydride

Nicolas Merle, François Stoffelbach, Mostafa Taoufik, Erwan Le Roux, Jean Thivolle-Cazat, Jean-Marie Basset
2009 Chemical Communications  
General procedure: all operations were performed with rigorous exclusion of air and water; standard Schlenk, high-vacuum and glovebox techniques were used for the preparation or handling of organometallic compounds and alumina supported materials. The silica supported tantalum hydride 1a and the alumina supported tungsten hydride 1b were prepared as already reported. i Elemental analyses were performed at the Service Central d'Analyses of CNRS in Solaize (France). Reaction of isobutane and
more » ... isobutane and isobutene metathesis in a continuous flow reactor: the metal hydride was charged using a glove box, into a stainless steel ½' cylinder reactor which can be isolated from atmosphere. After connection to the gas lines and purge of tubes, a flow of isobutane (or isobutene) controlled by a Brooks® mass flow-meter was sent onto the catalyst bed which was heated at 150°C. Hydrocarbon products and hydrogen were analyzed on line by GC (HP 8890 chromatograph fitted with an Al 2 O 3 /KCl 50m × 0.32mm capillary column, FID detector for hydrocarbons and a 3Ǻ molecular sieve column, TCD detector for hydrogen).
doi:10.1039/b823226a pmid:19532877 fatcat:ddgrlrurpff6fnxjuzvrzayaum