Reactions of 1 ,Zdihydropyridines (la-c) and 1,4-dihydropyridines (2a-c) in the presence of benzyne (3) under thermal conditions, and in the case of (2c) under photochemical conditions, have been investigated. Benzyne acts as an oxidizing agent to convert dihydropyridine (la) and (2a) to the corresponding pyridine (4) or adds as a dienophile to (lb-c).

the antibacterial agents are generally safe, but the list of possible adverse reactions is very long. adverse antibiotic reactions can involve every organ and system of the body and are frequently mistaken for signs of underlying disease. similarly, the mouth and associated structures can be affected by many antibiotic or chemicals. regarding different parts of the oral system, these reactions ...

background: mild to severe post-transfusion adverse reactions have been reported in a proportion of immunodeficient patients receiving intravenous immunoglobulin (ivig). anti-iga antibody has been proposed to be associated with development of such reactions.   objective: to assess the association between anti-iga levels of different isotypes and adverse reactions induced in immunodeficient pati...

manganese metal-organic framework (mn-mof) containing mn2+ ions, benzenetricarboxylic acid (btc) and n,n-dimethylformamid (dmf) was prepared and used as catalyst for oxidation of alkenes such as 1,1-diphenylethylene, trans-stilbene, cyclohexene, norbornene, styrene and cyclooctene to epoxides with 33-92% conversion and 75-100% selectivity and oxidation of alkanes such as fluorene, adamantane, e...

calcium aluminates (ca) are the most important hydraulically setting cements used for preparing refractory castables, because they develop high strength at very early ages after placements.  the anhydrous phases of this kind of cements are ca, ca2 and traces of c12a7 and alpha-alumina. the major hydraulic phase in all of the ca cements including ciment fondue is ca. once hydrated, it starts to ...

oscillating reactions are one of the most interesting topics in chemistry and analytical chemistry. fluctuations in concentrations of one the reacting species (usually a reaction intermediate) create an oscillating chemical reaction. in oscillating systems, the reaction is far from thermodynamic equilibrium. in these systems, at least one autocatalytic step is required. developing an instinctiv...

By the Act of 20 December 2019 amending – Law on system common courts, Supreme Court and some other Acts, changes were made to catalog disciplinary penalties provided for judges courts rules adjudicating them by introducing Article 109 § 1a courts. Despite repressive element, differ in nature severity. In penalties, they are graded from mildest most severe, educational, through more repressive,...

The problems found in this study are communication between agencies that still not running well, limited resources to supervise tourism business licenses Medan City, overlapping authority agencies, resulting each agency waiting for other misuse and the discovery of indications abuse implementation license supervision City. This type research is descriptive using qualitative methods. data collec...

a very efficient one-pot three-component synthesis of pyran derivatives has been improved by condensation of aldehydes and malononitrile with dimedone under 80 °c using sucrose as natural and biodegradable catalyst in water. this method offers some advantages including inexpensive, high to quantitative yields, short reaction time, and easy work-up. therefore, this methodology is entirely green ...

an efficient and direct procedure for the synthesis of benzo[h]-indeno[1,2-b]-quinoline derivatives has been described. the procedure employs a three-component condensation reaction in one-pot using 2h-indene-1, 3-dione, naphthalen-1-amine,and aldehydes in the presence of catalytic amount of l-prolinein aqueous media.