摘要 开发了一种用 H 2 O 2以中等至良好产率将硫化物氧化成亚砜和砜的直接选择性方法。反应在室温下在2 mol% VO(acac) 2 的存在下进行。所有亚砜和砜均采用气相色谱法检测,2-甲基苄基4-甲基苯基砜、4-甲基苄基4-甲基苯基砜、2-溴苄基4-甲基苯基砜和4-叔丁基苄基苄基砜的分子结构由下式测定单晶 X 射线晶体学。
Investigation of steric and electronic effects in the copper-catalysed asymmetric oxidation of sulfides
作者:Graham E. O'Mahony、Kevin S. Eccles、Robin E. Morrison、Alan Ford、Simon E. Lawrence、Anita R. Maguire
DOI:10.1016/j.tet.2013.08.063
日期:2013.11
in the copper-catalysed asymmetricoxidation of aryl benzyl, aryl alkyl and alkyl benzyl sulfides have been investigated. The presence of an aryl group directly attached to the sulfur is essential to afford sulfoxides with high enantioselectivities, with up to 97% ee for 2-naphthyl benzyl sulfoxide, the highest enantioselectivity achieved to date for copper-catalysed asymmetric sulfoxidation. In contrast
Abstract A novel bis (oxazoline) ligand derived from 1,3-dicyanobenzene was prepared and applied as a ligand for the preparation of a new binuclear molybdenyl complex. This ligand was characterized by UV–Vis, mass, 1 H NMR, and FT-IR spectroscopic methods, thermal and elemental analysis and X-ray diffraction. The molybdenum complex was prepared by the reaction of this ligand with MoO 2 (acac) 2 . The
摘要制备了一种由1,3-二氰基苯衍生的新型双(恶唑啉)配体,并将其作为配体用于制备新的双核钼烯基配合物。通过UV-Vis,质量,1 H NMR和FT-IR光谱法,热和元素分析以及X射线衍射对这种配体进行了表征。通过该配体与MoO 2(acac)2的反应制备钼配合物。还通过FT-IR,UV-Vis和ICP光谱,元素分析和热分析对催化剂进行了表征。在TBHP存在下,该催化体系可有效地用于烯烃和硫化物的氧化。在氧化反应中还研究了不同溶剂和供氧体的影响。
Epoxidation of alkenes and oxidation of sulfides catalyzed by a new binuclear vanadium bis-oxazoline complex
Bis(oxazoline) ligand, [2,2′-(1,3-phenylene)bis(oxazole-4,2-diyl)]-dimethanol, derived from dicyanobenzene was applied as ligand for complexation with vanadium. The catalyst was characterized by FT-IR, UV–Vis, 1H NMR spectroscopic methods, CHNS, ICP and thermal analyses, and magnetic susceptibility. The catalytic activity of this complex was then studied in the epoxidation of alkenes with TBHP (tert-butyl
衍生自二氰基苯的双(恶唑啉)配体[2,2'-(1,3-亚苯基)双(恶唑-4,2-二基)]-二甲醇用作与钒络合的配体。通过FT-IR,UV-Vis,1 H NMR光谱法,CHNS,ICP和热分析以及磁化率对催化剂进行了表征。然后在乙腈中用TBHP(氢过氧化叔丁基)对烯烃进行环氧化研究了该络合物的催化活性。在环辛烯的环氧化中研究了反应参数如溶剂种类和给氧体的影响。还研究了该催化剂在H 2 O 2氧化硫化物中的催化活性。 乙醇中生成相应的亚砜和砜。
A curable fluoroelastomer composition
申请人:Asahi Kasei Kogyo Kabushiki Kaisha
公开号:EP0182299A2
公开(公告)日:1986-05-28
A curable fluoroelastomer composition comprising:
(a) a fluoroelastomeric copolymer of vinylidene fluoride and at least one other fluorinated monomer;
(b) a curing accelerator comprising an iminium compound of the formula
wherein R1 is a substituted or unsubstituted aryl group, R2 is an alkyl or halogenated alkyl group, a cycloalkyl or halogenated cycloalkyl group, or a substituted or unsubstituted aralkyl group, and X is a halogen atom;
(c) a polyhydroxy compound as a cross-linking agent; and
(d) a metal compound selected from a divalent metal hydroxide, a divalent metal oxide or a mixture thereof.