[EN] PROCESS FOR PREPARING 2,3,3,3-TETRAFLUOROPROPENE<br/>[FR] PROCÉDÉ DE PRÉPARATION DE 2,3,3,3-TÉTRAFLUOROPROPÈNE
申请人:DAIKIN IND LTD
公开号:WO2010021406A1
公开(公告)日:2010-02-25
The present invention provides a process for producing 2,3,3,3-tetrafluoropropene including the step of dehydrofluorinating 1,1,1,2,3-pentafluoropropane, wherein 1,3,3,3-tetrafluoropropene and 1,1,3,3,3-pentafluoropropane are supplied together with 1,1,1,2,3-pentafluoropropane to a reactor containing a catalyst to simultaneously perform dehydrofluorination reaction and isomerization reaction. According to the process of the present invention, 2,3,3,3-tetrafluoropropene (HFO-1234yf) can be efficiently produced by effectively using the by-products of the dehydrofluorination reaction.
direct esterification of alcohols with non-noble metal-based catalytic systems faces great challenges. Here, we report a new chrome-based catalyst stabilized by a single pentaerythritol decorated Anderson-type polyoxometalate, [N(C4H9)4]3[CrMo6O18(OH)3C(OCH2)3CH2OH}], which can realize the efficient transformation from alcohols to esters by H2O2 oxidation in good yields and high selectivity without
醇与基于非贵金属的催化体系直接酯化面临巨大挑战。在这里,我们报告了一种由单季戊四醇修饰的安德森型多金属氧酸盐[N(C 4 H 9)4 ] 3 [CrMo 6 O 18(OH)3 C (OCH 2)3 CH 2 OH}],可以实现H 2 O 2从醇到酯的高效转化无需额外的有机配体,即可以高收率和高选择性进行氧化。该系统可耐受各种功能不同的醇,包括某些天然产物和医药中间体。铬基催化剂可以循环使用几次,并且仍保持原始配置和催化活性。我们还提出了合理的催化机制,并证明了其在工业上的应用潜力。
A direct anchoring of Anderson-type polyoxometalates in aqueous media with tripodal ligands especially containing the carboxyl group
Polyoxometalate-based organic–inorganic hybrids were synthesized by direct modification of the parent Anderson cluster with both the traditional tripodal ligand, CH3C(CH2OH)3, and a novel one containing a carboxyl group, CH3C(CH2OH)2(COOH), which was inaccessible from the traditional self-assembly protocol.
Parahydrogen-induced polarization (PHIP) in heterogeneous hydrogenation over bulk metals and metal oxides
作者:Kirill V. Kovtunov、Danila A. Barskiy、Oleg G. Salnikov、Alexander K. Khudorozhkov、Valery I. Bukhtiyarov、Igor P. Prosvirin、Igor V. Koptyug
DOI:10.1039/c3cc44939d
日期:——
The results show that, in general, observation of PHIP effects on metals does not require the presence of a support. In addition, certain metal oxides can produce PHIP effects in the absence of a supported metal. The new promising catalysts for producing PHIP heterogeneously have been identified.
inorganic ligand-supported chromium compound, (NH4)3[CrMo6O18(OH)6] (simplified as CrMo6), could be used to effectively promote this type of reaction in the presence of CO2. In almost all cases, oxidation of various alcohols (aromatic and aliphatic) could be achieved under mild conditions, and the corresponding carboxylic acids can be achieved in high yield. The chromiumcatalyst 1 can be reused several
将醇直接催化氧化为羧酸非常有吸引力,但是尚未建立经济的催化体系。在这里,我们显示纯的无机配体负载的铬化合物(NH 4)3 [CrMo 6 O 18(OH)6 ](简化为CrMo 6)可用于在存在以下条件下有效地促进此类反应CO 2。在几乎所有情况下,各种醇(芳香族和脂肪族)的氧化都可以在温和的条件下完成,相应的羧酸可以高收率实现。铬催化剂1可以重复使用几次,而不会造成活动损失。机理研究和控制反应表明,酸化是通过醛的关键氧化立即进行的。