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RISSynthesis of novel spiro[benzo[4,5]thiazolo[3,2-a]chromeno[2,3-d]pyrimidine-14,3′-indoline]-1,2′,13(2H)-triones via three component reaction
–intermolecular cyclization sequences of isatin derivatives, cyclohexane-1,3-diones, and 2-hydroxy-4H-benzo[4,5]thiazolo[3,2-a]pyrimidin-4-ones, employing 12-tungstophosphoric acid (H3PW12O40) as an effective and inexpensive catalyst....
Triphenylphosphine promoted addition of acetylenic esters to benzofuran-2,3-dione: one-pot synthesis of Novel γ-Spirolactones
The reaction of the zwitterionic intermediates generated from dialkyl acetylene dicarboxylates and triphenylphosphine with benzofuran-2,3-diones provides a one-pot route to new highly functionalized γ-spirolactones in good yield....
Synthesis of the new heterocyclic system 7,8-dihydro-6H-benzotetrazolothiadiazine and derivatives
New N,N-disubstituted 7,7-dimethyl-7,8-dihydro-6H-benzotetrazolothiadiazine-9-amines were synthesized
from sodium 1-amino-1H-tetrazole-5-thiolate and 2-bromo-5,5-dimethylcyclohexane-1,3-dione in multiple steps. The compounds were...
Tautomerization and intramolecular hydrogen bond strength of 1-(4- Chlorophenyl)-4,4,4-trifluorobutane-1,3-dione by quantum calculations and experimental spectroscopy
Two stable cis-enol forms can be drawn for p-Cl-TFBA and TFBA,
the structure and their relative stabilities, calculated at B3LYP/6-311++G** level of theory, are
show in Fig.1. The relative stabilities for the ...
Isomerism and Hydrogen Bonding in the Cis-enol Forms of 1-(n-pyridyl)butane-1,3-diones: A Theoretical Study
Molecular structure, isomerism, conformational stability and intramolecular hydrogen bonding (IHB) of cis-enol forms of 1-(n-pyridyl)butane-1,3-diones (nPBD) (n = 2, 3, or 4) have been investigated by means of density functional theory (DFT...
Silver(I) Ion Selective Transport through a Bulk Liquid Membrane Containing 5, 12 Di(phenoxymethyl)-1,4-dioxa-7,10-dithiacyclododecane-2,3-dione as Carrier
selective membrane transport of silver(I) by 5, 12-Di(phenoxymethyl)-1,4-dioxa-7,10-dithiacyclododecane-2,3-dione as carrier [4]. In this investigation we employed this synthesized crown ether as an excellent specific ion carrier for the highly efficient...
Competitive Taransport of Seven meta lCations through a Bulk Liquid Membrane Using 5, 12- Di(phenoxymethyl)-1,4-dioxa-7,10-dithiacyclodod- ecane-2,3-dione as Carrier
of 5,12- di(phenoxymethyl)-1,4-dioxa-7,10-dithiacyclododecane-2,3-dione as an ion carrier towards seven metal cations involving Cr3+,Co2+, Cu2+, Ag+, Cd2+, Zn2+ and Pb2+ that are present together in solution at equimolar concentrations across bulk...
Silver (I) ion selective transport through a bulk liquid membrane containing 5,12-di(phenoxymethyl)-1,4-dioxa-7,10-dithiacyclododecane-2,3-dione as carrier
5,12-Di(phenoxymethyl)-1,4-dioxa-7,10-dithiacyclododecane-2,3-dione is an excellent synthetic carrier for highly efficient and selective transport of Ag(I) ions through a liquid membrane. In the presence of thiosulfate as stripping agent...
Conformational analysis, intramolecular hydrogen bonding, and vibrational assignment of 4,4-dimethyl-1-phenylpentane-1,3-dione
Abstract
Molecular structure, conformational stabilities, and intramolecular hydrogen bonding (IHB) of 4,4-dimethyl-1-phenylpentane-1,3-dione (DMPD), have been investigated by means of density functional theory (DFT) calculations...
One-Pot, Three-Component Chemoselective Reaction of Isoquinolines, Dialkyl Acetylenedicarboxylates, and α-Ketolactones: An Unexpected Participation of an Ester Carbonyl Group in the 1,4-Dipolar Cycloaddition Reaction
The reaction of benzofuran-2,3-dione derivatives with dialkyl acetylenedicarboxylates (DAAD) and isoquinoline results in a three-component 1,4-dipolar cycloaddition reaction in which the ester carbonyl group is incorporated into a two-atom assembly...