我们之前曾报道过,亚氨基吡啶铁(II)配合物1可以原位容易定量获得,可以激活H 2 O 2。形成强大的氧化剂,能够进行脂肪族C–H键羟基化。在本研究中,我们将这种催化剂的应用范围扩大到将一系列醇氧化为相应的羰基化合物。脂族醇的氧化过程顺利进行,而苄醇的氧化则显示出挑战性。一些收集的证据表明,该氧化物种更倾向于芳环而不是醇部分。芳族环中电子密度的降低将氧化从芳族移向醇部分。出乎意料的是,环己醇相对于苄醇的优先氧化得以实现,显示出前所未有的选择性。
ammonium groups of water‐soluble poly(diallyldimethylammonium chloride) gives the precursor of a nanocatalyst for hydrogenation and transferhydrogenation reactions in water. In hydrogenation reactions, “on water” effect is seen for substrates such as cyclohexanones, methyl pyruvate, acetophenone, and safflower oil. With these substrates, higher turnover numbers are obtained in water than in methanol
[H 3 Ru 4(CO)12 ] -与水溶性聚(二烯丙基二甲基氯化铵)的季铵根离子配对为纳米催化剂的前体,用于水中的氢化和转移氢化反应。在氢化反应中,对于环己酮,丙酮酸甲酯,苯乙酮和红花油等底物,可以看到“水上”效应。使用这些底物,在水中比在甲醇中获得更高的周转率。团簇衍生的催化剂表现出独特的化学选择性,这在通过[RuCl 4 ] -与同一聚合物的季铵基团离子配对制备的催化剂中,或者在市售(5%)Ru / Al中都看不到。2 O 3。与此相反的Ru / Al的2 Ó 3中,将[RuCl 4 ] -衍生的催化剂,或许多其它基于钌的催化系统中,簇衍生的催化剂是完全惰性的朝向的氢化 NO 2,CN和芳环官能团。在水中,通过使用簇状催化剂和甲酸盐作为氢供体,可以减少典型的酮和醛。因此,可以由相应的醛制得工业上重要的氰基和硝基苄基醇。高分辨率TEM数据表明,独特的化学选择性是高度结晶的钌纳米颗粒的结果,该纳米颗粒主要由Ru(1
[EN] CARBIDOPA PRODRUGS AND USES THEREOF<br/>[FR] PROMEDICAMEMTS DE CARBIDOPA ET LEURS UTILISATIONS
申请人:XENOPORT INC
公开号:WO2004052841A1
公开(公告)日:2004-06-24
Prodrugs of carbidopa, derivatives of carbidopa prodrugs, methods of making prodrugs of carbidopa and derivatives thereof, methods of using prodrugs of carbidopa and derivatives thereof, and compositions of prodrugs of carbidopa and derivatives thereof are disclosed.
A process for preparing an aromatic amine by reacting a corresponding aromatic alcohol with an aminating agent selected from the group consisting of ammonia, primary amines and secondary amines, in the presence of hydrogen and a catalyst molding, at a temperature of from 60-300°. The catalyst molding comprises Zr, Pd and Pt and has an annular tablet form with an external diameter in the range from 2-6 mm, a height in the range from 1-4 mm and an internal diameter of from 1-5 mm or a topologically equivalent form with the same volume. Catalyst moldings comprising Zr, Pd and Pt are also provided. The catalyst molding has an annular tablet form with an external diameter in the range from 3-6 mm, a height in the range from 1-4 mm and an internal diameter of from 2-5 mm or a topologically equivalent form.
<sup>13</sup>C nuclear magnetic resonance spectra of methoxycyclohexane derivatives. Rotamer populations about C–OMe bonds as indicated by<sup>13</sup>C chemical shifts of methoxy- and ring-carbons and<sup>3</sup>J<sub>C,H</sub>coupling constants
作者:Alan H. Haines、Mohammad Seyedi Shandiz
DOI:10.1039/p19810001671
日期:——
Methoxy 13C chemicalshifts in methoxycyclohexanederivatives may be rationalized in terms of rotamerpopulationsabout the C–OMe bond and δ1-effects caused by steric interaction of the methoxy-group with substituents at the neighbouring 2- and 6-positions. Information on rotamerpopulations is obtained also from the 13C chemicalshifts of C-2 and C-6, and from the three-bond coupling between the proton
Selective Catalytic Hydrogenation of Arenols by a Well-Defined Complex of Ruthenium and Phosphorus–Nitrogen PN<sup>3</sup>–Pincer Ligand Containing a Phenanthroline Backbone
Selective catalytic hydrogenation of aromatic compounds is extremely challenging usingtransition-metalcatalysts. Hydrogenation of arenols to substituted tetrahydronaphthols or cyclohexanols has been reported only with heterogeneouscatalysts. Herein, we demonstrate the selectivehydrogenation of arenols to the corresponding tetrahydronaphthols or cyclohexanols catalyzed by a phenanthroline-based