Hafnium trifluoromethanesulfonate (Hf(OTf)4) as an efficient catalyst in the fries rearrangement and direct acylation of phenol and naphthol derivatives
作者:Shu Kobayashi、Mitsuhiro Moriwaki、Iwao Hachiya
DOI:10.1016/0040-4039(96)00216-x
日期:1996.3
Hafnium trifluoromethanesulfonate (hafniumtriflate, Hf(OTf)4) was found to be an efficientcatalyst in the Fries rearrangement of acyloxy benzene or naphthalene derivatives. The reactions proceeded smoothly in the presence of 5–20 mol% Hf(OTf)4. Regioselective direct acylation of phenol and naphthol derivatives with acid chlorides was also achieved by using Hf(OTf)4 as a catalyst.
Metal triflates–methanesulfonic acid as new catalytic systems: application to the Fries rearrangement
作者:Omar Mouhtady、Hafida Gaspard-Iloughmane、Nicolas Roques、Christophe Le Roux
DOI:10.1016/s0040-4039(03)01599-5
日期:2003.8
triflates (Mg, Ca, Sc, Cu, Zn, Y, Ln, Bi) and methanesulfonic acid, leading to active catalytic systems for the Fries rearrangement. In particular, the systems based on yttrium and copper(II) triflate proved to be very active and much cheaper than scandium triflate. The efficiency of these systems might result from the catalytic Lewis acid activation of Brønsted acids.
The catalytic Fries rearrangement of acyloxy naphthalenes using scandium trifluoromethanesulfonate as a catalyst
作者:Sh? Kobayashi、Mitsuhiro Moriwaki、Iwao Hachiya
DOI:10.1039/c39950001527
日期:——
The catalytic Fries rearrangement of acyloxy naphthalenes proceeds smoothly using a small amount of scandium trifluoromethanesulfonate (5 mol%) to afford the corresponding hydroxynaphthyl ketones in high yields.
alkoxycarbonylation of alkyl iodides with phenols and ethers. Based on the electron donor-acceptor photoactivation strategy, the reaction can be realized at atmospheric pressure of CO under transition metal-free conditions. This promising approach demonstrates high functional group tolerance and excellent chemoselectivity. Additionally, five-component perfluoroalkylative carbonylation for the synthesis of β-perfluoroalkyl
电荷转移络合物和光照射的结合为可持续化学的要求提供了一个有前途的解决方案。在此,我们开发了膦催化的可见光诱导的烷基碘与酚类和醚类的烷氧基羰基化反应。基于电子供体-受体光活化策略,该反应可以在无过渡金属的条件下在常压 CO 下实现。这种有前途的方法展示了高官能团耐受性和出色的化学选择性。此外,还可以实现由未活化的烯烃和全氟烷基碘化物合成β-全氟烷基酰氧基酯的五组分全氟烷基化羰基化反应。此外,由于克级反应的优异性能和13CO结果,它为大规模生产和其他应用提供了潜在的机会。
A phosphine sulfide, a manufacturing process therefor and a use thereof
申请人:MITSUI CHEMICALS, INC.
公开号:EP0972776A1
公开(公告)日:2000-01-19
A basic organic compound which is soluble in an organic solvent, does not have problems in its preparation or handling and exhibits catalytic activity as a basic compound, is a phosphine sulfide represented by the (1):
The phosphine sulfide represented by formula (1), is made by reacting one molecule of thiophosphoryl chloride with three molecules of a phosphorane represented by formula (2):
A process for effectively manufacturing a poly(alkylene oxide) involves polymerizing an alkylene oxide in the presence of the above organic compound (phosphine sulfide), or in the presence of the phosphine sulfide and an active hydrogen compound selected from water and organic compounds having a partial structure of -OH or -NH-.
A process for manufacturing a 1,2-dioxyethane derivative from an epoxy compound, i.e. manufacturing a 1,2-dioxyethane derivative involves reacting an epoxy compound with a carboxylate, carboxylic anhydride, carbonate or phenol compound, respectively, in the presence of the phosphine sulfide.