Mild and Selective Activation and Substitution of Strong Aliphatic CF Bonds
作者:Mario Janjetovic、Annika M. Träff、Göran Hilmersson
DOI:10.1002/chem.201406097
日期:2015.2.23
chemoselectively manipulating the strong aliphatic CFbond with direct transformation into a CN bond under mild conditions is reported. The activation and subsequent substitution of primary alkylfluorides is mediated by La[N(SiMe3)2]3, and results in high to excellent yields of tertiary amines. The methodology displays high selectivity towards the C(sp3)Fbond, and a variety of secondary amines are applicable
Overcoming solid handling issues in continuous flow substitution reactions through ionic liquid formation
作者:Saeed K. Kashani、Ryan J. Sullivan、Mads Andersen、Stephen G. Newman
DOI:10.1039/c8gc00618k
日期:——
the use of acid scavenging organic bases that generate low- to moderate-melting ionicliquids upon protonation. The application of these bases towards the most commonly run substitutions are demonstrated, enabling reactions to be run in flow without requiring additional equipment, specific solvents, or dilute reaction conditions to prevent clogging.
Synthesis of 1,3-Amino Alcohols, 1,3-Diols, Amines, and Carboxylic Acids from Terminal Alkynes
作者:Mingshuo Zeng、Seth B. Herzon
DOI:10.1021/acs.joc.5b01220
日期:2015.9.4
catalytic intermediates. Here we show that catalyst 2 can be employed to convert propargylic alcohols to 1,3-diols in high yield and with retention of stereochemistry at the propargylic position. The method is also amenable to propargylic amine derivatives, thereby establishing a route to enantioenriched 1,3-amino alcohol products. We also report the development of formal anti-Markovnikov reductive amination
Cobalt–Rhodium Heterobimetallic Nanoparticle-Catalyzed N-Alkylation of Amines with Alcohols to Secondary and Tertiary Amines
作者:Hyunho Chung、Young Keun Chung
DOI:10.1021/acs.joc.8b01109
日期:2018.8.3
selectively catalyze both mono- and bis-N-alkylation through the coupling of simple alcohols with amines, yielding a range of secondary and tertiary amines in good to excellent isolated yields. The reaction can be applied to benzyl alcohol with optically active 1-phenylethan-1-amines, and secondary amines were isolated in quantitative yields with an excellent enantiomeric excess (ee > 94%). Selectivity
[EN] DIMER SELECTIVE METALLOCENE CATALYSTS, NON-AROMATIC HYDROCARBON SOLUBLE ACTIVATORS, AND PROCESSES TO PRODUCE POLY ALPHA-OLEFIN OLIGMERS THEREWITH<br/>[FR] CATALYSEURS MÉTALLOCÈNES SÉLECTIFS DIMÈRES, ACTIVATEURS SOLUBLES DANS DES HYDROCARBURES NON AROMATIQUES, ET PROCÉDÉS DE PRODUCTION D'OLIGMÈRES POLY ALPHA-OLÉFINIQUES À L'AIDE DE CEUX-CI
申请人:EXXONMOBIL CHEMICAL PATENTS INC
公开号:WO2021086926A1
公开(公告)日:2021-05-06
The present disclosure generally relates to process to produce a poly alpha-olefin (PAO), comprising: a) introducing a first alpha-olefin to a first catalyst system comprising non-aromatic hydrocarbon soluble activator and a metallocene compound into a continuous stirred tank reactor or a continuous tubular reactor under first reactor conditions, wherein the first alpha-olefin is preferbaly introduced to the reactor at a flow rate of about 100 g/hr or more, to form a first reactor effluent comprising PAO ( such as at least 60 wt% of PAO dimer and 40 wt% or less of higher oligomers, where the higher oligomers are oligomers that have a degree of polymerization of 3 or more); and b) introducing the first reactor effluent and a second alpha-olefin to a second catalyst composition comprising an acid catalyst, such as BF3, in a second reactor to form a second reactor effluent comprising PAO trimer.