模具Umsetzung DER stereoisomeren Isopulegole 1 - 4 MIT乙硼烷erfolgt温特达赫Stereospezifität。Aus der nachfolgenden oxydativen Aufarbeitung resultieren die Gemische der 9-Hydroxymenthole,in denes eines der Diastereomeren starküberwiegt。Die Konstitution von 7 Diolen(5 – 11)世界遗产组织和综合组织。
A Study of V-Pillared Layered Double Hydroxides as Catalysts for the Epoxidation of Terpenic Unsaturated Alcohols
作者:Aida L Villa、Dirk E De Vos、Francis Verpoort、Bert F Sels、Pierre A Jacobs
DOI:10.1006/jcat.2000.3104
日期:2001.3
tests, the possible release of catalytically active dissolved V from the catalyst is investigated. Under all conditions tested, V10-LDH behaves as a heterogeneous catalyst, in contrast with some other tested V-containing materials (e.g., VAPO-5, or V in a siliceous matrix). Regioselectivity in the epoxidation of geraniol evidences the coordination of the alcoholgroup of geraniol on the active V center
Mg,Al层状双氢氧化物(LDHs)在温和的酸性条件下以钒为载体。通过XRD,拉曼和IR表征,可以确定该材料是纯水相LDH,在水镁石片材之间具有十钒酸根(V 10 O 28 6-)阴离子。当与叔丁基过氧化氢作为无水甲苯中的氧化剂一起使用时,该V 10 -LDH对香叶醇的环氧化活性最高。在一系列测试中,研究了催化剂中溶解有催化活性的V的可能释放。在所有测试条件下,V 10与其他一些经过测试的含V的材料(例如VAPO-5或硅质基质中的V)相比,-LDH表现为多相催化剂。香叶醇的环氧化中的区域选择性证明了香叶醇的醇基在活性V中心上的配位。最后,证明了V 10 -LDH催化剂可以用于一系列烯丙基和均烯丙基醇的环氧化,这些醇大部分是萜烯来源的。
Grafted non-ordered niobium-silica materials: Versatile catalysts for the selective epoxidation of various unsaturated fine chemicals
modification of non-ordered mesoporous silica supports, starting from niobocene dichloride via solvent-less organometallic precursor dry impregnation or conventional liquid-phase grafting technique. Grafted Nb/SiO2 solids were used as catalysts, in the presence of aqueous H2O2, for the epoxidation of unsaturated cyclic and terpenic compounds of interest for fine and specialty chemistry, in particular:
从二氯化铌通过无溶剂有机金属前驱体干法浸渍或常规液相接枝技术开始,通过无序介孔二氧化硅载体的后合成改性,合成了两种用于选择性环氧化的铌(V)-二氧化硅催化剂。在含水H 2 O 2存在下,将接枝的Nb / SiO 2固体用作催化剂,用于精细和特殊化学的目标不饱和环状和萜烯化合物的环氧化,特别是:环己烯,1-甲基环己烯,柠檬烯,香芹酚,α-萜品醇,异戊醇,香蒲醇,香芹酮以及角鲨烯和乙酸异戊酯。这些催化剂在较短的反应时间(低至1小时)中也显示出高收率(最高73%)和对所需环氧化物的优异化学选择性(最高98%)。
Über eine aussergewöhnliche Stereospezifität bei der Hydroborierung der diastereomeren (1<i>R</i>)-Isopulegole mit Diboran
作者:K. H. Schulte-Elte、G. Ohloff
DOI:10.1002/hlca.19670500123
日期:——
Die Umsetzung derstereoisomeren Isopulegole 1–4 mit Diboran erfolgt unter hoher Stereospezifität. Aus der nachfolgenden oxydativen Aufarbeitung resultieren die Gemische der 9-Hydroxymenthole, in denen eines der Diastereomeren stark überwiegt. Die Konstitution von 7 Diolen (5–11) wurde ermittelt und zum Teil unabhängige Wege zu ihrer Synthese entwickelt.
模具Umsetzung DER stereoisomeren Isopulegole 1 - 4 MIT乙硼烷erfolgt温特达赫Stereospezifität。Aus der nachfolgenden oxydativen Aufarbeitung resultieren die Gemische der 9-Hydroxymenthole,in denes eines der Diastereomeren starküberwiegt。Die Konstitution von 7 Diolen(5 – 11)世界遗产组织和综合组织。
Novel multicomponent oxidation catalyst and process for producing epoxy compound therewith
申请人:Hori Yoji
公开号:US20070117993A1
公开(公告)日:2007-05-24
A novel multicomponent oxidation catalyst that can be effectively used in, for example, an epoxidation reaction of olefins, etc., being inexpensive and high in versatility and that exhibits high catalytic activity; and a process for producing an epoxy compound through hydrogen peroxide oxidation of an olefin with the use of the multicomponent oxidation catalyst. There is provided a multicomponent oxidation catalyst comprising a tungsten compound, a quaternary ammonium salt, any of phosphoric acids and/or boric acids and a hydrogen sulfate salt. Further, there is provided a process for producing an epoxy compound, characterized in that an olefin is oxidized with hydrogen peroxide in the presence of the above multicomponent oxidation catalyst. The epoxy compound obtained by this process is useful as an intermediate of agricultural chemicals, medicines or the like, a raw material of various polymers, etc.
Multicomponent oxidation catalyst and process for producing epoxy compound therewith
申请人:Takasago International Corporation
公开号:US07557059B2
公开(公告)日:2009-07-07
A novel multicomponent oxidation catalyst that can be effectively used in, for example, an epoxidation reaction of olefins, etc., being inexpensive and high in versatility and that exhibits high catalytic activity; and a process for producing an epoxy compound through hydrogen peroxide oxidation of an olefin with the use of the multicomponent oxidation catalyst. There is provided a multicomponent oxidation catalyst comprising a tungsten compound, a quaternary ammonium salt, any of phosphoric acids and/or boric acids and a hydrogen sulfate salt. Further, there is provided a process for producing an epoxy compound, characterized in that an olefin is oxidized with hydrogen peroxide in the presence of the above multicomponent oxidation catalyst. The epoxy compound obtained by this process is useful as an intermediate of agricultural chemicals, medicines or the like, a raw material of various polymers, etc.