7464-48-4Relevant articles and documents
Hydroesterification and difunctionalization of olefins with N-hydroxyphthalimide esters
Leng, Lingying,Ready, Joseph M.
, p. 13714 - 13720 (2021/11/16)
Irradiation of aryl esters of N-hydroxyphthalimides in the presence of unactivated olefins promotes a mild and regioselective hydroesterification. Optimal results are obtained with the aid of fac-Ir(dFppy)3 in CH2Cl2. Terminal and 1,1-disubstituted olefins provide primary esters, and trisubstituted olefins provide secondary esters. The anti-Markovnikov selectivity is consistent with alkyl radical intermediates, which are also indicated by the formation of cyclized products from dienes. Monoacylated diols are formed from trisubstituted and tetrasubstituted olefins in the presence of water.
Synthesis of Unsymmetrical N-Heterocyclic Carbene-Nitrogen-Phosphine Chelated Ruthenium(II) Complexes and Their Reactivity in Acceptorless Dehydrogenative Coupling of Alcohols to Esters
He, Xiaochun,Li, Yaqiu,Fu, Haiyan,Zheng, Xueli,Chen, Hua,Li, Ruixiang,Yu, Xiaojun
, p. 1750 - 1760 (2019/04/17)
Two novel ruthenium complexes RuH(CO)Cl(PPh3)(κ2-CP) (1) and [fac-RuH(CO)(PPh3)(κ3-CNP)]Cl (2) bearing unsymmetrical N-heterocyclic carbene-nitrogen-phosphine (CNP) were synthesized and characterized with 1H NMR, 31P NMR, and HRMS. The structure of complex 2 was further confirmed by single-crystal X-ray diffraction. An anion exchange experiment proved that complex 2 could transform into complex 1 in solution. The two complexes exhibited a highly catalytic performance in acceptorless dehydrogenative coupling of alcohols to esters, and the excellent isolated yields of esters were given in a catalyst loading of 1% for para- and meta-substituted benzyl alcohols and long-chain primary alcohols. Although some ortho-substituted benzyl alcohols displayed a relatively low reactivity due to the steric hindrance and the coordination of electron donor with the ruthenium center, the good product yields were still obtained by prolonging the reaction time. Especially, this system successfully realized the dehydrogenative cross-coupling to esters between two different primary alcohols.
Graphene Oxide: An Efficient Acid Catalyst for the Construction of Esters from Acids and Alcohols
Chen, Zhengwang,Wen, Yuelu,Fu, Yejuan,Chen, Hai,Ye, Min,Luo, Guotian
supporting information, p. 981 - 985 (2017/05/05)
Graphene oxide was found to be an efficient and reusable acid catalyst for the esterification reaction. A wide range of aliphatic and aromatic acids and alcohols were compatible with the standard conditions and afforded the corresponding products in good yields. The heterogeneous catalyst can be easily recovered and recycled in dichloro-ethane solvent with good catalytic activity.