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[4+2] Cycloaddition reaction: Synthesis and antifungal activities of 5-substituted-4-phenyl-1,3-thiazolo[3,2-alpha]pyrimidin-6-one derivatives
Get PDFSyntheses and antifungal activities of
5-substituted-1,3-thiazolo[3,2-a] pyrimidin-6-one from
2-benzylidineamino-4-phenyl-1,3-thiazole and ketenes
formed in situ is described
Cymbopogon citratus L. essential oil as a potential antifungal agent against key weed moulds of Pleurotus spp. spawn
Get PDFThe essential oil of Cymbopogon citratus L. (250–1500 p.p.m.) was tested in vitro for antifungal activity
against seven Pleurotus spp. spawn-contaminating fungi, viz. Aspergillus flavus, A. fumigatus, A. niger, Alternaria alternata,
Penicillium citrinum, Curvularia lunata and Trichoderma harzianum. Oil-enrichment resulted in significant (p < 0.05)
reduction of growth for the pathogens examined. Fungal spore production inhibited up to 80% at 250 p.p.m. of the oil except
for C. lunata, which was inhibited by only 30%. In the higher oil concentration (1500 p.p.m.) employed, fungal sporulation
was completely retarded. Lemongrass oil reduces spore germination in A. flavus, A. fumigatus, A. alternata, P. citrinum
and T. harzianum, with the effects dependent on oil concentration. However, lemongrass oil at 250 p.p.m. accelerated spore
germination for A. niger and P. citrinum. Indeed, further increase in oil concentration shows complete inhibition. Among
the pathogens, C. lunata was found to be most resistant strain, while A. niger was the most sensitive strain against
lemongrass oil. Copyright © 2007 John Wiley & Sons, Ltd
SDS/CH2(CN)EWG/H2O: An efficient and green system for the cleavage of nitrones and imines in water
Get PDFDensities, ultrasonic velocities, viscisities and electrical conductivities of aqueous solutions of Mg(OAc)2and Mg(NO3)2
Get PDFA Quantitative Structure Activity Relationship Study on Permeation of Amino Acids in Enantioselective Membranes
Get PDFThe permeation of seven isomers of amino acids (AA) namely Tryptophan (Trp), Phenylalanine (Phe), Tyrosine
(Tyr), Phenylglycine (Phegly), Methionine (Meth), Threonine (Thr)and Serine (Ser) was studied using an
enantioselective membrane prepared from polysulphone containing L-tryptophan-glutaraldehyde condensation
product in the polymer matrix. The experiments were conducted in dialysis mode under optimized condition of the
aqueous phase pH and salt concentration in a two compartment membrane cell. The membrane was found to
exhibit selectivity towards all the D-isomers of amino acids studied in this work. In order to deduce implication on
the design of suitable membrane system for specific application, a quantitative structure activity relationship analysis
has been made using hydrophobicity as the molecular descriptor. In this analysis, the solute fluxes were analysed
on the basis of a permeation model consisting of diffusing flow alone. Finally, the model parameters of the diffusive
flux of both isomers were correlated with hydrophobicity taken as the molecular propert
Synthesis of novel pyrano[2,3-b]quinolines from simple acetanilides via intramolecular 1,3-dipolar cycloaddition
Get PDFSome novel isoxazole and pyrazole fused pyrano[2,3-b]quinolines were synthesized from simple acetanilides via intramolecular
1,3-dipolar cycloaddition reactions involving nitrones, nitrile oxides and nitrile imines as 1,3-dipoles, in a regioselective
manner
Rhodium(I) carbonyl complexes of mono selenium functionalized enylphosphino)methane and Bis(di- phenylphosphino)amine chelating ligands and their catalytic carbonylation activity
Get PDFThe chelate complexes of the types [Rh(CO)Cl(Ph2PCH2P(Se)Ph2)] (1) and [Rh(CO)Cl(Ph2PN(CH3)P(Se)Ph2)] (2) have been synthesized
and characterized by IR and NMR spectroscopy. The lower shift of the m(P–Se) bands and downfield shift of the 31P–
{ 1H}NMR signals for both P(III) and P(V) atoms in 1 and 2 compared to the corresponding free ligands indicate chelate formation
through selenium donor. 1 and 2 show terminalm(CO) bands at 1977 and 1981cm 1, respectively, suggesting high electron density at
themetalcenter.Themolecularstructureof2hasbeendeterminedbysingle-crystalX-raydiffraction.Therhodiumatomisatthecenter
ofasquareplanargeometryhavingthephosphorusandseleniumatomsofthechelatingligandatcis-position,onecarbonylgrouptransto
selenium and one chlorine atom trans- to phosphorus atom. 1 and 2 undergo oxidative addition (OA) reaction with CH 3I to produce
acyl complexes [Rh(COCH3)ClI(Ph2PCH2P(Se)Ph2)] (3) and [Rh(COCH3)ClI(Ph2PN(CH3)P(Se)Ph2)] (4), respectively. The kinetics of the
OAreactionsrevealthat1undergoesfasterreactionbyabout4.5timesthan2.Thecatalyticactivityof1and2incarbonylationofmethanol
was higher than that of the well known species [Rh(CO) 2I2] and 2 shows higher catalytic activity compared to 1.
2005 Elsevier B.V. All rights reserved.
Keywords: Rhodium(I) carbonyl complexes; Bis(diphenylphosphino)methane selenide; Bis(diphenylphosphino)amine selenide; Oxidative addition;
Carbonylatio
Oxidative addition of different electrophiles with rhodium(I) carbonyl complexes of unsymmetrical phosphine-phosphine monoselenide ligands
Get PDFA new series of iodocarbonyl ruthenium (II) complexes with unsymmetrical phosphine-phosphine sulfide ligands of the type Ph2P(CH2)nP(S)Ph2, n = 1-4: Isolation and structural investigation
Get PDFHexa-coordinated chelate complex cis-[Ru(CO) 2I 2(P\S)] (1a){P\S=g 2-(P,S)-coordinated} and penta-coordinated non-chelate
complexes cis-[Ru(CO) 2I 2(PS)] (1b–d){PS=g1-(P)-coordinated} are produced by the reaction of polymeric [Ru(CO) 2I 2] n with
equimolar quantity of the ligands Ph 2P(CH 2) nP(S)Ph 2 {n=1(a),2(b),3(c),4(d)} in dichloromethane at room temperature. The
bidentatenatureoftheligandainthecomplex1aleadstotheformationoffive-memberedchelateringwhichconfersextrastability
tothecomplex.Ontheotherhand,1:2(Ru:L)molarratioreactionaffordsthehexa-coordinatednon-chelatecomplexescis,cis,trans[Ru(CO)
2I 2(P$S) 2](2a–d)irrespectiveoftheligands.Allthecomplexesshowtwoequallyintenseterminalm(CO)bandsintherange
2028–2103cm 1. Them(PS) band of complex 1a occurs 23cm 1 lower region compared to the corresponding free ligand suggesting
chelation via metal–sulfur bond formation. X-ray crystallography reveals that the Ru(II) atom occupies the center of a slightly distortedoctahedralgeometry.Thecomplexeshavealsobeencharacterizedbyelementalanalysis,
1H, 13Cand 31PNMRspectroscopy.
2005 Elsevier B.V. All rights reserved
Synthesis of novel classes of Pyrido[2,3-d]-pyrimidines, pyrano[2,3-d]pyrimidines, and pteridines
Get PDF6-Amino-5-formyluracils 1 and 5-formyl-6-hydroxyuracils 4 react with
Meldrum 19sacid2inthepresenceofpiperidineascatalystunderthermolyticconditions
to afford 6-carboxy-2,4,7-trioxopyrido[2,3-d]pyrimidines 3 and 6-carboxy-2,4,7trioxopyrano[2,3-d]pyrimidines
5 in good yield. Under identical conditions, 6-amino5-nitrosouracils
6 react with 2 to afford pteridine-6-carboxylic acids 7 in good yields