HETEROCIKLICNA JEDINJENJA PDF

Heterociklična jedinjenja su ciklična jedinjenja koja pored ugljenika sadrže u strukturi prstena jedan ili više atoma nekih drugih elemenata-. Start studying Heterociklična jedinjenja (Petočlana). Learn vocabulary, terms, and more with flashcards, games, and other study tools. izvor: Wikipedia. Stranice: Poglavlja: Heterociklična Jedinjenja (2 prstena), Heterociklična Jedinjenja (3 prstena), Heterociklična Jedinjenja (4 ili više.

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Many medications contain 2-pyridone structure: A case study, Tetrahedron 58 In comparison to conventional synthesis, microwave reactor synthesis shows that the reaction is 5 or more times faster using microwave technique. Agrawal, A simple and convient synthesis of 4,6-disubstituted jwdinjenja 1H -ones under solvent-free microwave conditions, Indian J.

Nasuprot tome, mikrotalasno zracenje je efikasan izvor zagrevanja koji direktno prenosi energiju kroz interakciju sa polarnim molekulima prisutnim u reakcionoj smesi. The method is applicable not only to aromatic aldehydes with electron-donor and electron-acceptor groups, but also to heterocyclic and aliphatic jedinjenjja.

The products were obtained in high yields and in a short reaction time up to 7 minwhile the conventional method of synthesis required up to 4 h with lower yields Figure 4.

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At the end of the review, examples of microwave synthesis of ring fused W-substituted 2-pyridones will be discussed. Microwaves have a frequency between 0. The synthesized derivatives of 4,6-dimethylcyanopyridone Table 1, entries were obtained in heteroviklicna quantitative yield, while the derivatives of 4,6-diphenylcyanopyridones Table 1, entries were obtained in lower jedibjenja.

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The synthesis of 3,5-dicyanopyridone is carried out in aqueous solution starting from aldehydes and malononitrile in the presence of sodium hydroxide as a base. Also, this type of reaction is used to obtain arylazo pyridone dyes [].

Instead of p-toluenesulfonic acid, silica gel or aluminum oxide can be used, but yields were lower with longer reaction times. Sham, Pyridone-containing farnesyltransferase inhibitors: Farah, The search for a digitalis substitute II milrinone Win its action on the heart-lung preparation of the dog, Life Sci. Brkovic and Aleksandar D. Petrovic, Primena mikrotalasne tehnike u organskoj hemiji i organskoj hemijskoj tehnologiji, Hem.

Zhu, One-pot synthesis of pyridones and related compounds under microwave irradiation in water, Jiamusi Daxue Xuebao Ziran Kexueban 28 Loupy, Solvent-free synthesis of 4-aryl substituted 5-alkoxycarbonylmethyl-3,4-dihydropyridones under microwave irradiation, Tetrahedron Lett. Aromatic heterocyclic compounds represent an important group of compounds due to their biological and medical applications. Condensation of type means that the condensation involves two acyclic systems one of which has jefinjenja and the other only one carbon atom.

tiofen – Heterociklična jedinjenja

In the second part, microwave assisted synthesis of 2-quionolones will be given. Microwave synthesis is among jedinjenjja that respect the principles of the so-called “green chemistry” which jdinjenja one more reason for performing this type of synthesis [50]. In a similar way, 2-quinolones can be obtained from o-aminoarylketones and acetoacetic ester using microwave synthesis min at [degrees]C in the presence of a catalyst Ce[Cl.

Synthesis can be also performed in the solid phase.

Winscom, Photographic elements containing a de-aggregating compound and dyeforming coupler, Eastman Kodak Co. Jones, Pyridines and their benzo derivatives: Grossmann, Effects of known and potential antioxidants on animal models of pathological processes diabetes, jedinhenja lesions, allergic bronchospasmExp.

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Kategorija:Heterociklična jedinjenja kiseonika – Wikiwand

Another example of microwave synthesis of condensing type of 2-pyridones is shown in Figure heterodiklicna [59]. Besides the conventional synthesis, microwave assisted syntheses were also developed.

In addition, condensed 2-pyridone can be obtained by the reaction of 1,3-dicarbonyl compounds and substituted benzaldehydes or phenylendialdehide in the presence of ammonium acetate using microwave irradiation in the absence of a solvent, as previously described for the synthesis of 2-pyridones [].

It should be noted that 4-quinolones can be obtained from substituted aniline and diethyl etoxymethylene malonate in a conventional microwave oven. Health, A 46 Uscumlic, Synthesis, structure and solvatochromic properties of 3-cyano-4,6-diphenyl 3and 4-substituted phenylazo pyridones, J.

In this synthesis, product was obtained starting from cyanoacetamide, ethyl cyanoacetate and ethylamine. However, the use of microwave irradiation has a number of advantages over both conventional methods: Tools Related Resources ReadSpeaker:.

Due to increased product yields and purity, lower waste and sometimes solvent free conditions, microwave assisted syntheses are among the methods that respect the principles of the “green chemistry”. In this manner, carbostyril analogues can be synthesized Figure Galembeck, Conformational preferences of non-nucleoside HIV-1 reverse transcriptase inhibitors, Tetrahedron 57