77016-78-5Relevant academic research and scientific papers
Optical, electrochemical and current?voltage characteristics of novel coumarin based 2,4-dinitrophenylhydrazone derivatives
Arthoba Nayaka, Y.,Basavarajappa, K. V.,Manjunatha, K. B.,Purushothama, H. T.,Rudresha, B. J.,Vinay, M. M.,Yathisha, R. O.
, (2019/08/26)
A series of novel 2,4-dinitrophenylhydrazone derivatives of coumarins (DNP1?DNP3) have been synthesized by novel method and characterized by spectroscopic techniques and were used as photosensitizers on zinc nanocones, which were prepared by microwave com
3-KETOCOUMARINES FOR LED PHOTOCURING
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Paragraph 0068-0072, (2015/10/05)
The present invention relates to 3-ketocoumarines which can be used as photoinitiators in LED photocuring and to a process for curing compositions comprising said 3-ketocoumarines.
The indium(iii) chloride catalyzed synthesis of sulfur incorporated 3-acylcoumarins; Their photochromic and acetate sensing properties
Surya Prakash Rao,Desai, Avinash
, p. 63642 - 63649 (2015/02/19)
The synthesis and evaluation of the photochromic properties of 3-acylcoumarins are very important as they exhibit selective sensing properties. We found that InCl3 efficiently catalyzes the condensation of 2-hydroxybenzaldehydes and β-keto este
Synthesis and selective human monoamine oxidase inhibition of 3-carbonyl, 3-acyl, and 3-carboxyhydrazido coumarin derivatives
Secci, Daniela,Carradori, Simone,Bolasco, Adriana,Chimenti, Paola,Yá?ez, Matilde,Ortuso, Francesco,Alcaro, Stefano
experimental part, p. 4846 - 4852 (2011/11/13)
Several 3-carbonyl (1-26), 3-acyl (27-52), and 3-carboxyhydrazido (53-58) coumarins have been synthesized in high yields (72-99%) and tested in vitro for their human monoamine oxidase A and B (hMAO-A and hMAO-B) inhibitory activity. Different substituents on the coumarin nucleus were evaluated for their effect on biological activity and isoform selectivity. Substitution at position C7 of the 3-ethyl ester coumarin ring, or the introduction of a hydrazido substituent at C3, were important to obtain highly potent and selective hMAO-B inhibitors with IC50 values in the nanomolar range. Some derivatives were also submitted to a stability test and showed no chemical cleavage in vitro.
KETOCOUMARINS. A NEW CLASS OF TRIPLET SENSITIZERS
Specht, Donald P.,Martic, Peter A.,Farid, Samir,++
, p. 1203 - 1211 (2007/10/02)
Several derivatives of 3-ketocoumarins were prepared and are shown to have many of the photophysical criteria required for efficient triplet sensitizers.These compounds include 3-aroylcoumarins (1) and 3,3'-carbonyl-biscoumarins (2).The aryl groups in 1 are either phenyl and substituted phenyl derivatives or heterocyclic groups such as thienyl and benzofuryl.The substituents on the coumarin moiety in 1 and 2, if any, are alkoxy or dialkylamino.These compounds, with absorption maxima between 330 and 450 nm, have extinction coefficients in the range of 1E4 to almost 1E5, which is an important criterion for efficient sensitization of thin films of polymers as those used in photoresists and litography.The singlet-triplet intersystem crossing (isc) efficiencies of several derivatives approach unity.In others, however, a radiationless decay process competes with the isc.The decay process is particularly dominant in the assymetrically substituted derivatives of 2, but seems to be considerably supressed in polymeric matrices.The triplet energies of these compounds range from ca. 48 to 60 kcal/mol.Some of these ketocoumarins show phosphorescence spectra that suggest the presence of "frozen-in" rotamers.
