36678-05-4Relevant articles and documents
Regioselective rhodium-diphosphine ligand catalyzed hydroformylation of vinyl acetate
Liang, Haoran,Zhang, Lin,Zheng, Xueli,Fu, Haiyan,Yuan, Maolin,Li, Ruixiang,Chen, Hua
experimental part, p. 977 - 981 (2012/08/08)
Rhodium-catalyzed hydroformylation of vinyl acetate with the use of diphosphine ligands was studied. A high regioselectivity (branched:linear of 99:1) and activity (TOF: 4000 h-1) under optimum conditions were achieved by using a 2,2'-bis(diphenylphosphino methyl)-1,1'-biphenyl ligand. The high turnover number (9200) obtained under mild conditions and stability of the catalyst indicates that it would be useful for industrial vinyl acetate hydroformylation.
Oxidation of Cyclic Acetals as a Preparative Method of Diol Monoester Production
Kuramshin, E. M.,Kulak, L. G.,Nazarov, M. N.,Zlotsky, S. S.,Rakhmankulov, D. L.
, p. 591 - 599 (2007/10/02)
Glycol monoesters were produced by oxidation of acetals with oxygen, hydroperoxides, hydrogen peroxide, hydrotrioxide and ozon.Addition of salts of metals of variable valency and crown-ether substantially increase the rate of oxidation and hydroxylation.The most efficient oxidizer is ozon.
Carbonylation of diols and their ethers and esters with ruthenium catalysts: synthesis of lactones and hydroxyacids ethers and esters
Braca, G.,Sbrana, G.,Galletti, A. M. Raspolli,Berti, S.
, p. 245 - 258 (2007/10/02)
Diols and their formic or acetic esters can be carbonylated to give lactones or the corresponding hydroxyacid ester or ethers in the presence of carbonylruthenium iodide systems. -/alkyl or metal iodide, at a temperature of 200 deg C and CO pressure of 10-20 MPa.The reaction in the case of 1,3-propanediol gives γ-butyrolactone, with a selectivity of 60-70 percent.Side reactions of homologation to 1,4-butanediol derivatives and hydrogenolysis to n-propyl derivatives by H2 produced by the water gas shift reaction (WGSR) also occur, together with acid-catalyzed dehydration to give linear polypropylene glycols, α,ω-diols with more than 3 carbon atoms in the chain preferentially give hydroxyacid esters and ethers.The cyclic ether by-products and linear polyether by-products can be further activated and carbonylated under the reaction conditions to give lactones or hydroxy-acid derivatives thus increasing the total yield of carbonylation products.The formation of H2 by WGSR involving water produced by the acid-catalyzed dehydration reactions, and the subsequent hydrogenolysis and homologation reactions cannot be avoided.
