玉米黄质和physalien已按照方案C 19 + C 2 + C 19 = C 40由乙酰氧基-C 19-醛和乙炔合成。乙氧基-异-C 19-醛是从异佛尔酮经酮-异-C 19-醛获得的,使用乙烯基醚和丙烯基醚,对其应用了我们的β-胡萝卜素合成的扩链程序。光学惰性的合成化合物具有与天然产物相同的熔点,溶液的吸收光谱相同,并且混合的熔点没有降低。
A novel DABCO-catalyzed Ireland-Claisen [3,3]-rearrangement of allylic acrylates to give a-methylene-γ,δ -unsaturated carboxylic acids in the presence of an excess of TMSCl and DBU in refluxing acetonitrile was developed. The protocol provides an easy entry to a-methylene-γ,δ-unsaturated carboxylic acids from allylic alcohols in good yields.
CATALYTIC OXIDATION OF 3,5,5-TRIMETHYLCYCLOHEXA-3-ENE-1-ONE (ß-ISOPHORONE) WITH HYDROGEN PEROXIDE TO AFFORD 2,6,6-TRIMETHYL-2-CYCLOHEXENE-1,4-DIONE (KETO-ISOPHORONE)
申请人:Evonik Degussa GmbH
公开号:US20180155264A1
公开(公告)日:2018-06-07
The present invention provides a novel process for producing 2,6,6-trimethyl-2-cyclohexene-1,4-dione (keto-isophorone) by catalytic oxidation of 3,5,5-trimethylcyclohexa-3-ene-1-one (β-isophorone) with hydrogen peroxide as the oxidant. In particular, the novel process includes phase transfer reagent in a biphasic system including an organic phase and an aqueous phase wherein the biphasic system includes 1) a tungsten polyoxyometallate as catalyst and hydrogen peroxide, and/or 2) a mixture of a) a mineral acid, b) hydrogen peroxide, and c) a metal tungstate.
Combination of two catalytic sites in a novel nanocrystalline TiO2–iron tetrasulfophthalocyanine material provides better catalytic properties
作者:Mirvat Beyrhouty、Alexander B. Sorokin、Stéphane Daniele、Liliane G. Hubert-Pfalzgraf
DOI:10.1039/b507211e
日期:——
Mesoporous titania nanocrystals containing iron tetrasulfophthalocyanine (FePcS) have been synthesised by a one-pot hydrolytic process from a modified Ti alkoxide; the novel hybrid catalyst was efficient in heterogeneous oxidation of 2,3,6-trimethylphenol and β-isophorone suggesting a cooperative effect between TiO2 and FePcS catalytic sites.
Chitosan-based Schiff base-metal complexes (Mn, Cu, Co) as heterogeneous, new catalysts for the β-isophorone oxidation
作者:C S THATTE、M V RATHNAM、A C PISE
DOI:10.1007/s12039-014-0601-4
日期:2014.5
A new chitosan-based Schiff base was prepared and complexed with manganese, cobalt and copper. These Schiff base metal complexes were used as heterogeneous catalysts for the air oxidation of β-isophorone to ketoisophorone. The obtained complexes were characterized by means of FT-IR,1HNMR spectroscopy, elemental analysis, powder X-ray diffraction, field emission gun scanning electron microscopy, electron spin resonance spectroscopy, ICP-AES and solubility tests. Thermal properties were also investigated using thermal gravimetric analysis. Data obtained by thermal analysis revealed that these complexes showed good thermal stability. The conversion and selectivity of β-isophorone to ketoisophorone for each prepared catalyst was studied using a batch reactor and gas chromatography for product identification and quantification. The results were compared against the homogeneous bis-salicylaldehyde ethylenedi-imine-Mn catalyst. The use of methanol, acetone, methyl isobutyl ketone and n-hexane as solvent and its effect on conversion and selectivity was also investigated. Acetone was found to be a promising solvent for the β-isophorone oxidation. The role of triethyl amine and acetyl acetone in the oxidation reaction has also been investigated.
Selective synthesis of 4-hydroxyisophorone and 4-ketoisophorone by fungal peroxygenases
作者:Carmen Aranda、Martí Municoy、Víctor Guallar、Jan Kiebist、Katrin Scheibner、René Ullrich、José C. del Río、Martin Hofrichter、Angel T. Martínez、Ana Gutiérrez
DOI:10.1039/c8cy02114g
日期:——
Some fungal peroxygenases (UPOs) selectively oxidize α-isophorone to 4-hydroxyisophorone (4HIP) and 4-ketoisophorone (4KIP) while others are less selective or unable.