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
摘要:
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.
Copper-catalyzed methylation of 1,3-diketones with tert-butyl peroxybenzoate
作者:Zhi-Hao Zhou、Cheng-Kun Li、Shao-Fang Zhou、Adedamola Shoberu、Jian-Ping Zou
DOI:10.1016/j.tet.2017.03.058
日期:2017.5
Copper-catalyzed radical methylation of 1,3-diketones with tert-butyl peroxybenzoate in air is described, providing a general pathway to α-methyl 1,3-diketones in moderate to good yields. This protocol has been scaled up to 50 g, and one of the synthesized products can be used in the synthesis of medicine, Rosuvastatin.
POLYMERS DERIVED FROM BIS(THIENOCYCLOPENTA)BENZOTHIADIAZOLE AND THEIR USE AS ORGANIC SEMICONDUCTORS
申请人:Merck Patent GmbH
公开号:EP2331600A1
公开(公告)日:2011-06-15
[EN] POLYMERS DERIVED FROM BIS(THIENOCYCLOPENTA)BENZOTHIADIAZOLE AND THEIR USE AS ORGANIC SEMICONDUCTORS<br/>[FR] POLYMÈRES DÉRIVÉS DE BIS(THIÉNOCYCLOPENTA)BENZOTHIADIAZOLE ET LEUR UTILISATION EN TANT QUE SEMI-CONDUCTEURS ORGANIQUES
申请人:MERCK PATENT GMBH
公开号:WO2010031479A1
公开(公告)日:2010-03-25
The invention relates to conjugated polymers comprising bis(thienocyclopenta)benzothiadiazole units or derivatives thereof, to methods of their preparation, to novel monomer units used therein, to the use of the polymers in organic electronic (OE) devices, and to OE devices comprising the polymers.