20237-34-7Relevant articles and documents
Applications of PC(sp3)P iridium complexes in transfer dehydrogenation of alkanes
Bzier, David,Brookhart, Maurice
, p. 3411 - 3420 (2015/02/19)
Iridium ethylene complexes based on the PC(sp3)P pincer-type triptycene ligand have been synthesized. Complexes bearing various substituents on the phosphines have been investigated as catalysts in transfer dehydrogenation of alkanes. The complex 8a, which bears isopropyl groups, has demonstrated high stability and activity when used as a catalyst in the disproportionation of 1-hexene at 180 °C and in the transfer dehydrogenation of linear and cyclic alkanes with tert-butylethylene as a hydrogen acceptor at 200°C. A similar complex bearing a CH2NMe2 group, 33, allowed support of the catalyst on γ-alumina for operation in a heterogeneous mode.
Reactivity of unsaturated linear C6 hydrocarbons on Pd(111) and H(D)/Pd(111)
Vasquez Jr., Natividad,Madix
, p. 234 - 252 (2007/10/03)
The adsorption and reactivity of 1-hexene, 1,5-hexadiene, 1,3-hexadiene, and 1,3,5-hexatriene on clean Pd(111) and hydrogen (deuterium)-saturated/Pd(111) were investigated using temperature-programmed reaction spectroscopy. The low-temperature adsorption configuration for the linear C6 hydrocarbons is proposed to be a weakly π-bonded species. The adsorbed molecules first desorb molecularly with a fraction converting to a more tightly bonded half-hydrogenated state, which either β-hydride eliminates to release the alkene or dehydrogenates completely to adsorbed carbon and hydrogen. Dehydrocyclization to benzene is observed on this surface, whereas it does not occur on Pd(100). Cyclization of 1,3,5-hexatriene to benzene occurs at temperatures as low as 333 K on Pd(111). Although hydrogenation of 1,3-hexadiene adsorbed on clean Pd(111) and of 1,3-hexadiene and 1,5-hexadiene adsorbed on H/Pd(111) to hexene was observed, and hexatriene was hydrogenated to hexadiene and hexene, hydrogenation of the alkenes to hexane was not observed for any of the unsaturated species. H-D exchange into all the adsorbed alkenes was observed. The exchange reaction is proposed to occur through the reversible C-H bond formation in a half-hydrogenated intermediate.
NICKEL CHLORIDE CATALYZED REARRANGEMENT OF ALLYLIC PHOSPHITES
Lu, Xiyan,Zhu, Jingyang
, p. 239 - 244 (2007/10/02)
Allylic phosphites can be rearranged to the corresponding allylic phosphonates under the catalysis of nickel chloride.Dienes and dialkyl phosphonates are formed by an elimination reaction when there is hydrogen atom at the β-position of the carbon-metal bond in the allylic intermediate.The mechanisms of these reactions are discussed.
