Preparation of <i>β</i>-Keto Esters and <i>β</i>-Diketones by C-Acylation/Deacetylation of Acetoacetic Esters and Acetonyl Ketones with 1-Acylbenzotriazoles
作者:Alan R. Katritzky、Zuoquan Wang、Mingyi Wang、Chavon R. Wilkerson、C. Dennis Hall、Novruz G. Akhmedov
DOI:10.1021/jo049274l
日期:2004.10.1
Acyl-, aroyl-, and heteroaroyl-acetic esters 6a−f and 8a−l are prepared by reactions of 1-acylbenzotriazoles 1a−k with acetoacetic esters 5 or 7a,b in the presence of sodium hydride followed by regioselective deacetylation. Similar C-acylation/deacetylation of acetylacetone and benzoylacetone affords β-diketones 10a−d and 13a−c, respectively.
Steady state and laser photolysis studies of keto-enol tautomerizations in 2-alkyl-1,3-diketones having five-membered rings in acetonitrile: Temporal UV-A sunscreen
作者:Yurie Suwa、Minoru Yamaji
DOI:10.1016/j.jphotochem.2015.10.010
日期:2016.2
Keto-enol tautomerization in 2-alkyl-1,3-diketons having five-membered rings was studied using steady state and laser flash photolysis techniques in solution. The alkyl keto-diketones undergo photoinduced tautomerization mainly in the triplet state to the enol in acetonitrile. The alkyl enol-diketones, thus formed, undergo thermal tautomerization to the original keto forms in a few days. The alkyl enol-diketones show fast internal conversion from the excited singlet state to the ground state without yielding the corresponding isomeric forms (rotamer). Based on the computation for state energies of the keto, enol and isomer forms, a schematic energy diagram for the tautomerization was drawn. (C) 2015 Elsevier B.V. All rights reserved.
BASSETTI, M.;CERICHELLI, G.;FLORIS, B., TETRAHEDRON, 44,(1988) N 10, 2997-3004
作者:BASSETTI, M.、CERICHELLI, G.、FLORIS, B.
DOI:——
日期:——
BASSETTI, MAURO;CERICHELLI, GIORGIO;FLORIS, BARBARA, J. CHEM. RES. SYNOP.,(1988) N 7, 236-237
作者:BASSETTI, MAURO、CERICHELLI, GIORGIO、FLORIS, BARBARA