Scope and Mechanism of Homogeneous Tantalum/Iridium Tandem Catalytic Alkane/Alkene Upgrading using Sacrificial Hydrogen Acceptors
作者:David C. Leitch、Jay A. Labinger、John E. Bercaw
DOI:10.1021/om500231t
日期:2014.7.14
increases only modestly with temperature. In contrast, the rate of 1-hexene/n-heptane transfer hydrogenation catalyzed by t-Bu[PCP]IrH4 is inverse order in 1-hexene and increases substantially with temperature. Styrene has been investigated as an alternate sacrificial hydrogen acceptor. Styrene dimerization catalyzed by Cp*TaCl2(alkene) is considerably slower than 1-hexene dimerization. The conversion of styrene/heptane
Upgrading Light Hydrocarbons via Tandem Catalysis: A Dual Homogeneous Ta/Ir System for Alkane/Alkene Coupling
作者:David C. Leitch、Yan Choi Lam、Jay A. Labinger、John E. Bercaw
DOI:10.1021/ja405191a
日期:2013.7.17
Light alkanes and alkenes are abundant but are underutilized as energy carriers because of their high volatility and low energy density. A tandem catalytic approach for the coupling of alkanes and alkenes has been developed in order to upgrade these light hydrocarbons into heavier fuel molecules. This process involves alkane dehydrogenation by a pincer-ligated iridium complex and alkene dimerization by a Cp*TaCl2(alkene) catalyst. These two homogeneous catalysts operate with up to 60/30 cooperative turnovers (Ir/Ta) in the dimerization of 1-hexene/n-heptane, giving C-13/C-14 products in 40% yield. This dual system can also effect the catalytic dimerization of n-heptane (neohexene as the H-2 acceptor) with cooperative turnover numbers of 22/3 (Ir/Ta).
DIARYL AMINE ANTIOXIDANTS PREPARED FROM BRANCHED OLEFINS
申请人:Chemtura Corporation
公开号:US20170015618A1
公开(公告)日:2017-01-19
Diaryl amines are selectively alkylated by reaction with branched olefins, which olefins are capable of forming tertiary carbonium ions and can be conveniently prepared from readily available branched alcohols. The diaryl amine products are effective antioxidants and often comprise a high amount of di-alkylated diaryl amines and a low amount of tri- and tetra-alkylated diaryl amines.