AgOTf‐catalyzed transesterification of β‐keto esters

Abstract

AgOTf proved to be an effective catalyst for the transesterification of β‐keto esters with primary, secondary and tertiary alcohols. The products were obtained in high yield within a reasonable reaction time period. The kinetics of the transesterification reaction were also studied and the reaction was found to follow second‐order kinetics. Copyright © 2012 John Wiley & Sons, Ltd.

Zinc oxide supported silver nanoparticles as a heterogeneous catalyst for production of biodiesel from palm oil

“…Additionally, the vacant orbital of metals could coordinate to the oxygen of starting esters which thereby increases the electrophilicity of the carbonyl carbon. The increase in electrophilicity of esters could also accelerate the rate of transesterification reaction . ZnO an inexpensive, nontoxic and easily available Lewis acid is a good example of metal oxide which has widely been used as a catalyst in various chemical transformations and is widely studied.…”

An asymmetric Salamo-based Zn complex supported on Fe3O4 MNPs: a novel heterogeneous nanocatalyst for the silyl protection and deprotection of alcohols under mild conditions

“…[5][6][7][8][9][10] Therefore, it is evident that a wide variety of approaches have been disclosed and also the enantioselective synthesis of alcohols can be regarded as one of the most important steps in total synthesis. 11 Although there are important advances in the latestage functionalization of complex molecules, the protection of hydroxyl groups is highly required during the succeeding steps. 12 In order to protect the alcohol group, there are several methods.…”

β‐Ketoesters: An Overview and It's Applications via Transesterification

“…Iron(III) dimer complex, [31] Modified Vilsmeier-Haack reagents TCCA/DMF, TCTA/DMF (SOCl 2 /DMF, POCl 3 /DMF), [32] FeÀ Mn cyanide, [33] Stefan et. al., reported the boronic acid synthesis via monophasic transesterification by evaporation of reagents/ byproducts, [34] Zn-PAM, [35] MCS, [36] ultrasonic technique, [37] DBU-CO 2 , [38] enzymatic transesterification, [39] M 2 CO 3 or MI (M = Li, Na, K, Cs), [40] pPh-SO 3 H & pBPA-SO 3 H, [41] Ti(Oi-pr) 4 , [42] NaOR, [43] Metal/ ETS-10, [44] BBAIL, [45] EmimOAc, [46] BF 3 .OEt 2 , [47] Zn(Me) 2 , [48] N-Heterocyclic olefins, [49] microwave irradiation, [50] dilithium tetra-tertbutylzincate, [51] K 2 CO 3 /DMSO, [52] Ionic liquid (references therein), [53] methylboronic acid, [54] AuÀ Cu nanoparticles, [55] CO 2 / Novozym-435, [56] CuFe 2 O 4 , [57] Cesium carbonate, [58] Ion-exchange resins (Lewatit K1221), [59] imidazolium ionic liquids, [60] 4-(3methyl-1-imidazolio)-1-butanesulfonic acid triflate, [61] Mn(II) Carbonate & Mn(II)Sulfate, [62] DBU at high pressure, [63] ball-mill technique, [64] AgOTf, [65] Sol-Gel MoO 3 /TiO 2 , [66] lipase from Aspergillus niger, [67] TEA, [68] Sn-catalyst, [69] lanthanum(III) Isopropoxide, [70] Candida rugo...…”