1-Hexene Oligomerization in Liquid, Vapor, and Supercritical Phases over Beidellite and Ultrastable Y Zeolite Catalysts
作者:Jérôme P.G. Pater、Pierre A. Jacobs、Johan A. Martens
DOI:10.1006/jcat.1998.2250
日期:1998.10
zeolite catalysts. Vapor, liquid, and supercritical states of the reacting hydrocarbons in the reactor tube were established by using propane, pentane, octane, and dodecane as solvents. The initial activity, stability with operation time, and selectivity are very dependent on the physical state of the hydrocarbons. Highest activity and stability are reached in the liquid phase using octane and dodecane solvent
Racemic 5,9-dimethylpentadecane and 5,9-dimethylhexadecane, the major and minor constituents, respectively, of the sex pheromone of Leucoptera coffeella, have been synthesized from citronellol in 56-58% overall yield through six steps. Ultrasound irradiation efficiently supported tosylation of alcohols (two steps) as well as the subsequent cross coupling reactions with the pertinent Grignard reagents (also two steps).
Formation of Three-Membered Rings by S<sub>H</sub>i Displacement. Reverse of Cyclopropyl Ring Opening<sup>1</sup>
作者:Dennis D. Tanner、Liying Zhang、Li Qing Hu、Pramod Kandanarachchi
DOI:10.1021/jo960879u
日期:1996.1.1
carried out in the presence of several transfer agents (CCl(4), CCl(3)Br, CCl(2)Br(2)) initiate a radical chain addition of CCl(2)X(*) and yield cyclized materials resulting from the S(H)i displacement of halogen by a carbon-centered radical. The radical displacement of a halogen on carbon, the reverse of homolyticdisplacement on cyclopropyl carbon, is dominant at low temperatures. The rate constants for
Addition reactions of organometallic reagents to nitrogen trifluoride and enhanced alkyl–alkyl coupling by NF3
作者:Randolph K. Belter
DOI:10.1016/j.jfluchem.2015.03.013
日期:2015.7
A survey of the reaction of nitrogen trifluoride (NF3) with various organometallic reagents finds that organomagnesium (Grignard) reagents are the most useful for producing N,N-difluoroaminoalkanes. Alkyl–alkyl coupling is a persistant side reaction. Organolithiums are marginally effective. Organocopper, organozinc reagents undergo primarily alkyl–alkyl coupling catalyzed by the presence of NF3. Organocalcium
TaCl5-catalyzed reaction of 1-alkenes with n-alkyl Grignard reagents
作者:Rifkat M. Sultanov、Ruslan R. Ismagilov、Natal'ya R. Popod'ko、Artur R. Tulyabaev、Usein M. Dzhemilev
DOI:10.1016/j.jorganchem.2012.10.001
日期:2013.1
Tantalum-catalyzed reaction of organomagnesium compounds (OMCs), bearing normal alkyl radicals, with 1-alkenes to afford novel iso-alkylmagnesiums has been systematically studied for the first time. The probable mechanism of the reaction implying the intermediate formation of β,β′-dialkyl substituted tantalacyclopentanes is discussed.