Essential Oil Composition and Allelopathic Effect of the Brazilian Lamiaceae Hesperozygis ringens (Benth.) Epling and Hesperozygis rhododon Epling
摘要:
Samples of Hesperozygis ringens (Benth.) Epling and Hesperozygis rhododon Epling essential oils were analyzed by a combination of analytical techniques: capillary gas chromatography, liquid/solid chromatography, GC/MS coupling, and NMR spectroscopy. Twenty-four components have been identified representing altogether more than 95% of the oil content. The oil of H. ringens is constituted mainly by pulegone (79.2%) accompanied by several oxygenated derivatives (pulegone oxides, 1.2%; 8-hydroxy-p-menth-3-one, 1.3%; and 8-hydroxy-p-menth-4-en-3-one, 3.7%); that of H. rhododon contains menthone and pulegone as main compounds in almost comparable amounts (43.4% and 29.6%, respectively). Tests carried out on lettuce seeds using alcoholic extracts of the two species showed significant antigerminating properties mainly for H. ringens. The same activity was observed with its essential oil.
METHOD FOR MANUFACTURING AN EPOXY COMPOUND AND METHOD FOR EPOXIDIZING A CARBON-CARBON DOUBLE BOND
申请人:Takumi Kiyoshi
公开号:US20120108830A1
公开(公告)日:2012-05-03
The present invention provides a method for producing an epoxy compound, comprising oxidizing a carbon-carbon double bond of an organic compound by hydrogen peroxide in the presence of a neutral inorganic salt and a mixed catalyst of a tungsten compound (a), at least one phosphorus compound selected from the group consisting of phosphoric acids, phosphonic acids, and salts thereof (b) and a surfactant (c), and an epoxidizing method comprising oxidizing a carbon-carbon double bond by hydrogen peroxide in the presence of the catalyst and the neutral inorganic salt.
Unique Salt Effect on Highly Selective Synthesis of Acid-Labile Terpene and Styrene Oxides with a Tungsten/H2O2 Catalytic System under Acidic Aqueous Conditions
styrene oxides are effectively synthesized in high yields with good selectivities using tungsten-catalyzed hydrogen peroxide epoxidation in the presence of Na2SO4. The salt effect is thought to originate with the addition of a saturated amount of Na2SO4 to aqueous H2O2; this addition strongly inhibited the undesired hydrolysis of the acid-labile epoxy products, despite the biphasic conditions of substrate
摘要 在Na 2 SO 4的存在下,使用钨催化的过氧化氢环氧化,可以高产率,高选择性地有效合成酸不稳定的环氧化物,例如萜烯和氧化苯乙烯。盐的作用被认为是由于在H 2 O 2水溶液中加入了饱和的Na 2 SO 4引起的。尽管底物为油相且H 2 O 2为酸性水相的双相条件,但这种添加强烈地抑制了酸不稳定的环氧产物的不希望的水解。 在Na 2 SO 4的存在下,使用钨催化的过氧化氢环氧化,可以高产率,高选择性地有效合成酸不稳定的环氧化物,例如萜烯和氧化苯乙烯。盐的作用被认为是由于在H 2 O 2水溶液中加入了饱和的Na 2 SO 4引起的。尽管底物为油相且H 2 O 2为酸性水相的双相条件,但这种添加强烈地抑制了酸不稳定的环氧产物的不希望的水解。
Unique Salt Effect on the High Yield Synthesis of Acid-Labile Terpene Oxides Using Hydrogen Peroxide under Acidic Aqueous Conditions
Acid-labile epoxides such as α-pinene oxide are (effectively) synthesized in high yield from the epoxidation of terpenes with aqueous H2O2 catalyzed by Na2WO4, [Me(n-C8H17)3N]HSO4, and PhP(O)(OH)2 in the presence of Na2SO4 as an auxiliary additive under organic solvent-free conditions at ambient temperature. Origin of the salt effect is considered that the addition of a saturated amount of Na2SO4 to
由Na 2 WO 4,[Me(n -C 8 H 17)3 N] HSO催化的H 2 O 2水溶液与萜烯环氧化,可高产率地合成酸不稳定的环氧化物,例如α-pine烯4和PhP(O)(OH)2在作为辅助添加剂的Na 2 SO 4的存在下于室温下在无有机溶剂的条件下进行。盐效应的起因被认为是在H 2 O 2水溶液中添加了饱和量的Na 2 SO 4。 尽管具有高酸性反应条件,但仍可强烈抑制酸不稳定的环氧产物的不良水解。 氧化-催化-环氧化物-萜类化合物-绿色化学
ALUMINUM CATALYST
申请人:TAKASAGO INTERNATIONAL CORPORATION
公开号:US20150315110A1
公开(公告)日:2015-11-05
An aluminum catalyst is obtained by reacting at least one compound of a specific alkylaluminum compound and a specific hydridoaluminum compound with a specific hydroxy compound. The specific hydroxyl compound is a specific 2-cycloalkyl-6-arylphenol or a specific di(2-cycloalkyl-6-arylphenol). A method for producing isopulegol or optically active isopulegol includes selectively cyclizing citronellal using the aluminum catalyst.
Citronellal was converted into isopulegol epoxide in a one-pot
two-step reaction achieving a 68% global yield on Ti-MCM-41 and designing a
two-solvent catalytic system.