77-79-2Relevant articles and documents
Synthesis of symmetrical sulfones from rongalite: Expansion to cyclic sulfones by ring-closing metathesis
Kotha, Sambasivarao,Khedkar, Priti,Ghosh, Arun Kumar
, p. 3581 - 3585 (2005)
A simple method for the synthesis of symmetrical sulfones using rongalite has been developed. Terminally olefinic sulfone derivatives were subjected to ring-closing metathesis (RCM) reactions to generate cyclic sulfones. Wiley-VCH Verlag GmbH & Co. KGaA, 2005.
Synthesis, structure and catalytic study of oxygen chelated ruthenium (II) carbene complex
Liu, Guiyan,Shao, Mingbo,Zhang, Huizhu,Wang, Jianhui
, p. 51 - 54 (2014/05/06)
New oxygen chelated ruthenium carbene complex containing carbonyl oxygen and ether oxygen has been developed. The X-ray structure of the complex showed that the carbonyl oxygen of the amide and the terminal oxygen of the benzylidene ether are both coordinated to the metal to give an octahedral structure. The catalytic activities of this new complex for olefin metathesis reactions were investigated and it exhibited excellent performances for the ring-closing metathesis (RCM) of diethyl diallymalonate at 30 °C and even at 0 °C. The initiation rate of the catalyst was higher than that for the Hoveyda catalyst ((H2IMes)(Cl)2Ru = C(H)(C6H 4-2-OiPr)) and it was also active for cross metathesis (CM).
A six-coordinated cationic ruthenium carbyne complex with liable pyridine ligands: Synthesis, structure, catalytic investigation, and DFT study on initiation mechanism
Liu, Guiyan,Zheng, Lu,Shao, Mingbo,Zhang, Huizhu,Qiao, Weixia,Wang, Xiaojia,Liu, Bowen,Zhao, Haitao,Wang, Jianhui
supporting information, p. 4718 - 4725 (2014/06/24)
A novel six-coordinated high-valence cationic ruthenium carbyne complex bearing two liable pyridine ligands was prepared in high yield by the reaction of the ruthenium-based complex (IMesH2)(Cl)2(C 5H5N)2RuCHPh [IMesH2=1,3-dimesityl- 4,5-dihydroimida-zol-2-ylidene] with excess iodine as an oxidant in CH 2Cl2 at 25 °C under N2. The new ruthenium carbyne-based complex shows moderate to good catalytic activity for ring-closing metathesis reactions. Importantly, no double bond isomerization by-product was produced at elevated reaction temperatures (100 °C-137 °C) in the reaction catalyzed by the synthesized ruthenium carbyne complex. A mechanism involving the in situ conversion of the ruthenium carbyne through the addition of an iodide to the carbyne carbon was also proposed, and DFT calculations were performed to explain the initiating mechanism.
Synthesis and reactivity of oxygen chelated ruthenium carbene metathesis catalysts
Zhang, Yiran,Shao, Mingbo,Zhang, Huizhu,Li, Yuqing,Liu, Dongyu,Cheng, Yu,Liu, Guiyan,Wang, Jianhui
, p. 1 - 9 (2014/03/21)
The rate of initiation of Hoveyda catalysts is affected by the electronic and steric effects that act upon the Rua?O coordination. In order to boost the activity of Hoveyda catalysts, a series of new oxygen chelated ruthenium carbene metathesis catalysts containing an N-heterocyclic carbene (NHC) and a carbonyl group has been developed, and their catalytic activities for olefin metathesis reactions were investigated. The aliphatic end groups of complexes (H2IMes)(Cl)2RuC(H)[(C6H 3X)OCH(Me)(C(O)OEt)(X = H, OMe, Me, NO2)] were functionalized by the attachment of a straight-chain ester. The X-ray structures of complex (H2IMes)(Cl)2RuC(H)[(C6H 4)OCH(Me)(C(O)NMe2)] showed that the carbonyl oxygen of the amide and the terminal oxygen of the benzylidene ether are both coordinated to the metal to give an octahedral structure. However, the carbonyl oxygen of complexes (H2IMes)(Cl)2RuC(H)[(C6H 3X)OCH(CH2C(O)OCH2)(X = H, OMe)] does not coordinate to the metal due to the steric effect of the lactone. All these complexes were used as catalysts for olefin metathesis reactions and all exhibited excellent performances for the ring-closing metathesis (RCM) of diethyl diallymalonate at 30 C. The initiation rate of these catalysts was higher than that for the Hoveyda catalyst ((H2IMes)(Cl) 2RuC(H)(C6H4-2-OiPr)) and these complexes are also active for cross metathesis (CM).
A unique ruthenium carbyne complex: A highly thermo-endurable catalyst for olefin metathesis
Wang, Jianhui,Shao, Mingbo,Zheng, Lu,Qiao, Weixia,Wang, Jingjing
supporting information, p. 2743 - 2750,8 (2012/12/12)
A cationic ruthenium carbyne complex was prepared and was found to initiate olefin metathesis reactions with good activities, which throws a new light on the design of a new type of ruthenium catalyst for RCM reactions. More importantly, no double bond isomerized by-product was observed even at elevated temperatures in reactions catalyzed by the new carbyne complex. A mechanism involving the in situ conversion of the ruthenium carbyne to a ruthenium carbene complex via addition of an iodide to the carbyne carbon was also proposed.
Synthesis, structure and catalytic study of chloro-bridged two-core ruthenium carbene complexes
Qiao, Weixia,Shao, Mingbo,Wang, Jianhui
experimental part, p. 197 - 202 (2012/08/27)
The reaction of a ruthenium carbide complex RuCl2(C:) (PCy 3)2 with [H(Et2O)x] +[BF4]- at a molar ratio of 1:2 produced a two-core ruthenium carbene complex {[RuCl(CHPCy3)(PCy 3)]2(μ-Cl)3}+·[BF 4]- (8) in the form of a yellow-green crystalline solid. After a ligand exchange reaction of 8 with LiBr, a bromide ruthenium carbene complex {[RuBr(CHPCy3)(PCy3)]2(μ-Cl) 3}+·[BF4]- (9) was obtained as a crystalline solid. Catalytic studies showed that both 8 and 9 are selective catalysts for ring closing metathesis of unsubstituted terminal dienes. More importantly, no isomerized byproduct was observed when 8, or 9 was used as the catalyst at an elevated temperature (137 °C), indicating that both 8 and 9 are chemo-selective catalysts for ring closing metathesis reactions.
METHOD FOR MANUFACTURING SULFOLENE COMPOUND AND METHOD FOR MANUFACTURING SULFOLANE COMPOUND
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Page/Page column 11-12, (2011/10/12)
An object of the present invention is to provide a method for manufacturing a sulfolene compound, the method being capable of inhibiting generation of polymers. Another object of the present invention is to provide a method for manufacturing a sulfolane compound, the method being capable of controlling inhibition of hydrogenation catalyst activity and smoothly hydrogenating a sulfolene compound. The present invention is a method for manufacturing a sulfolene compound represented by a formula (2), which comprises the step of reacting a conjugated diene compound represented by a formula (1) with sulfur dioxide in the presence of a metallocene compound: in the formula (1), R1 to R6 each independently represents a hydrogen atom or a C1 to C6 alkyl group, in the formula (2), R1 to R6 represent the same groups represented by R1 to R6 in the formula (1).
Recycling a homogeneous catalyst through a light-controlled phase tag
Liu, Guiyan,Wang, Jianhui
supporting information; experimental part, p. 4425 - 4429 (2010/08/07)
(Figure Presented) A homogeneous ruthenium-carbene complex was tagged with a lightresponding nitrobenzospiropyran group to control its solubility through reversible conversion between its neutral (lipophilic) and ionic (lipophobic) states using light irradiation (see scheme; Mes = mesityl). This tagged complex has significant catalytic activity in ring-closing metathesis reactions and was recycled several times.
Ferrocene redox controlled reversible immobilization of ruthenium carbene in ionic liquid: A versatile catalyst for ring-closing metathesis
Liu, Guiyan,He, Haiyan,Wang, Jianhui
experimental part, p. 1610 - 1620 (2011/02/25)
A ferrocene-tagged ruthenium carbene 15 that can be reversibly immobilized in an ionic liquid (IL) via the controlled oxidation and reduction of a ferrocene tag was prepared. This offers a new strategy which uses redox chemistry to control immobilization and to recycle both the catalyst and the IL. In this experiment, 11 recycles were performed for the ring-closing metathesis (RCM) of a substrate using 16 as the catalyst in an ionic liquid (IL). More importantly, after the reaction was completed, the ruthenium catalyst was easily separated from the supporting IL by just adding decamethylferrocene (DMFc) to reduce the cationic ferrocene and then extracting it with benzene. Thus, this recycle system offers an easy way to recycle both the ruthenium catalyst and the IL.
Synthesis of cyclic sulfones by ring-closing metathesis.
Yao, Qingwei
, p. 427 - 430 (2007/10/03)
A general and highly efficient synthesis of cyclic sulfones based on ring-closing metathesis has been developed. The synthetic utility of the resulting cyclic sulfones was demonstrated by their participation in stereoselective Diels-Alder reactions and transformation to cyclic dienes by the Ramberg-Baecklund reaction.
