• Title, Summary, Keyword: 1,2-Diketones

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Photochemical Reduction of 1,2-Diketones in the Presence of $TiO_2$

  • Park, Jun U;Hong, Mi Jeong;Go, Park Gwang Hui
    • Bulletin of the Korean Chemical Society
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    • v.22 no.11
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    • pp.1213-1216
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    • 2001
  • 1,2-Diketones, camphorquinone and 1-phenyl-1,2-propanedione, are converted to the corresponding $\alpha-hydroxyketones$ in moderate to good yields by TiO2-catalyzed photochemical reactions in deoxygenated alcoholic media. The reduction yield for 1-phenyl-1,2-propanedione is considerably increased by addition of water or triethylamine

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PHOTOCHEMICAL REACTIONS OF AROMATIC $\alpha$-DIKETONES

  • Kim, Sung Sik
    • Journal of Photoscience
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    • v.1 no.2
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    • pp.123-126
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    • 1994
  • Irradiation of aromatic $\alpha$-diketones, such as benzil, 4,4'-dimethylbenzil, 4-chlorobenzil, 4,4'-diisopropylbenzil, 3,3,'-dimethylbenzil, in methanol gives rise to xanthone derivatives, in addition to $\alpha$-hydroxyketones. Irradiation of 4,4'-dibromobenzil, 2,2'-pyridil, 2,2'-naphthil and 9,9'-anthril yields only $\alpha$-hydroxyketones, whereas 4,4'-dimethoxybenzil yields methyl 4-methoxybenzoate.

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DABCO-Catalyzed Green Synthesis of 2-Hydroxy-1,4-diones via Direct Aldol Reaction of Arylglyoxals in Water

  • Saraei, Mahnaz;Eftekhari-Sis, Bagher;Mozaffarnia, Sakineh
    • Journal of the Korean Chemical Society
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    • v.57 no.2
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    • pp.252-259
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    • 2013
  • A green and simple method to synthesize of 1,4-diketones via aldol reaction of arylglyoxals and ketones such as 1-(4-methoxyphenyl)-2-propanone, deoxybenzoin and substituted acetophenones in the presence of a catalytic amount of DABCO in water at room temperature has been reported. Corresponding 2-hydroxy-1,4-diones were obtained in moderate to high yields with simple separation of obtained solid from reaction mixture and recrystallization.

Cr(Ⅲ) Complexes of Tetraazamacrocycles Derived from $\alpha$-Diketones and Diaminoalkanes

  • Rai, Pramod K.;Gupta, Ajay K.;Prasad, Raghu N.
    • Bulletin of the Korean Chemical Society
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    • v.14 no.2
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    • pp.179-183
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    • 1993
  • Template condensation of ${\alpha}$-diketones such as 2,3-butanedione or benzil with diaminoalkanes such as 1,2-diaminoethane, 1,3-diaminopropane, 1,4-diaminobutane, 1,6-diaminohexane, 1,8-diaminooctane or 1,12-diaminododecane in the presence of Cr(III) results in the formation of complexes of the type $[CrI,X_2]X$ (where L = tetraazamacrocycle having 12 to 32-membered ring and $X={NO_3}^- or Cl^-).$ The complexes have been characterized by elemental analyses, magnetic measurements and IR and diffuse reflectance spectra.

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Silica Sulfuric Acid as a Mild and Efficient Reagent for the Synthesis of 1,4-Diazepine and 1,5-Benzodiazepine Derivatives (Silica Sulfuric Acid를 이용한 효율적인 1,4-diazepine and 1,5-benzodiazepine 유도체의 합성)

  • Joshi, Y.C.;Saingar, Shalini;Kavita, Kavita;Joshi, P.;Kumar, Rajesh
    • Journal of the Korean Chemical Society
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    • v.55 no.4
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    • pp.638-643
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    • 2011
  • The synthesis of biologically active 1H-1,4-diazepines 4a-d and 3H-1,5-benzodiazepines 5a-d in good yields, from the heterocyclization reaction of 2-(4-methylthio benzenesulfonyl)-1,3-dimethyl/1-methyl-3-phenyl/1,3-diphenyl/1-methyl-3-ethoxy propane-1,3-dione 3a-d with ethylenediamine (EDA) and o-phenylenediamine (o-PDA), respectively, in the presence of silica sulfuric acid (SSA) is described. The novel ${\beta}$-diketones/${\beta}$-ketoesters 3a-d were synthesized by the condensation reaction of 4-methylthiobenzenesulfonyl chloride 1 with various ${\beta}$-diketones/${\beta}$-ketoesters 2a-d. All structures of the newly synthesized compounds were elucidated by elemental analysis and spectral studies. The compounds 4a-d and 5a-d have been screened for antimicrobial, antifungal and anthelmintic activity.

Synthesis, Characterization and Antimicrobial Activity of Zirconium (IV) Complexes

  • Sharma, Shobhana;Jain, Asha;Saxena, Sanjiv
    • Journal of the Korean Chemical Society
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    • v.56 no.4
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    • pp.440-447
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    • 2012
  • Heteroleptic complexes of zirconium (IV) derived from bulky Schiff base ligands containing a sulphur atom and oximes of heterocyclic ${\beta}$-diketones of the general formula ZrLL' (where $LH_2=RCNH(C_6H_4)SC:C(OH)N(C_6H_5)N:CCH_3$, $R=-C_6H_5$, $-C_6H_4Cl(p)$ and $L^{\prime}H_2=R^{\prime}C:(NOH)C:C(OH)N(C_6H_5)N:CCH_3$, $R^{\prime}=-CH_2CH_3$, $-C_6H_5$, $-C_6H_4Cl(p)$ were prepared by the reactions of zirconium tetrachloride with disodium salts of Schiff bases ($L\;Na_2$) and oximes of heterocyclic ${\beta}$-diketones ($L^{\prime}\;Na_2$) in 1:1:1 molar ratio in dry refluxing THF. The structures of these monomeric zirconium (IV) complexes were elucidated with the help of elemental analysis, molecular weight measurements, spectroscopic (IR, NMR and mass) studies. A distorted trigonal bipyramidal geometry may be suggested for these heteroleptic zirconium (IV) complexes. The ligands (bulky Schiff base ligands containing a sulphur atom and oximes of heterocyclic ${\beta}$-diketones) and their heteroleptic complexes of zirconium (IV) were screened against A. flavus, P. aeruginesa and E. coli.

Synthesis of Diaryl $\alpha$-Diketones via Palladium Catalyzed Double Carbonylative Homo Coupling of Aryl Iodides with Carbon Monoxide

  • Kim Jin Il;Kim Nam Jung;Ryu Cheol Mo
    • Bulletin of the Korean Chemical Society
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    • v.9 no.1
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    • pp.30-32
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    • 1988
  • Symmetrical diaryl ${\alpha}-diketones$ were synthesized in moderately good yields through the palladium catalyzed reaction of aryl iodides with carbon monoxide. The reaction was tolerant of a wide variety of fuctionalities($OCH_3,\;CH_3,\;NO_2,\;OH,\;COOH$) on the aryl iodide. On the other hand, the similar reaction of aryl bromides or chlorides with carbon monoxide did not proceed.

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Hydrated Ferric Sulfate [Fe2(SO4)3·xH2O]: An Efficient and Reusable Catalyst for One-Pot Synthesis of 2H-Indazolo[2,1-b]phthalazine-triones

  • Choudhury, Abhik;Ali, Shahzad;Khan, Abu T.
    • Journal of the Korean Chemical Society
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    • v.59 no.4
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    • pp.280-283
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    • 2015
  • Hydrated ferric sulfate can be used as an efficient and reusable catalyst for the synthesis of 2H-indazolo[2,1-b]phthalazine-trione derivatives via one-pot three-component condensation reaction of phthalhydrazide, aromatic aldehydes and cyclic-1,3-diketones in ethanol under reflux conditions.