ganic chemistry. In particular, they play an important role in carbon–carbon bond formation. A metalacycle, i.e., a ring compound containing a transition metal, is a useful intermediate in synthetic organic chemistry. Oxidative cyclization of unsaturated hydrocarbons, such as alkene, alkyne, carbonyl compounds, or nitrile, using a low-valent transition metal is a useful reaction for synthesis o...

Many chemistry students have difficulty in understanding an organic chemistry subject called reaction mechanisms. Mastering the subject would require the application of chemical intuition and chemical commonsense adequately. This work discusses a novel framework using Qualitative Reasoning (QR) to provide means for learning reaction mechanisms through simulation. The framework consists of a num...

Chemistry is a discipline that studies how molecules convert into one another. A chemical reaction can involve several different molecules. For example, a molecule of sodium chloride can fall apart (i.e., dissociate) into the sodium and chlorine atoms. The simplest possible chemical reaction involves conversion of some molecule A into a different form B. To describe this reaction, we write the ...

When you cook, do know why it smells so good (or bad) in the house? It is all about chemistry. All over world, cooking based on tradition and love, but chemistry of foods that allows recipes to succeed or not. Among chemical reactions occur food, Maillard reaction, which occurs between amino acids sugars, most familiar. This actually a complex series lead formation aromas, tastes, colors as foo...

Methyl peroxy, a key radical in tropospheric chemistry, was recently shown to react with the hydroxyl radical at an unexpectedly high rate. Here, the molecular reaction mechanisms are elucidated using high-level quantum chemical methodologies and statistical rate theory. Formation of activated methylhydrotrioxide, followed by dissociation into methoxy and hydroperoxy radicals, is found to be th...

1 Structure & Reactivity of Transition Metal Systems The substantial decrease in execution times afforded by the new hardware facilitated an enormous number of calculations spanning four main areas of transition metal chemistry: organometallic chemistry; coordination chemistry; development of new methodologies; and bioinorganic chemistry. Much of the research involved geometry optimisation of m...

Polysaccharides are complex but essential compounds utilized in many areas such as biomaterials, drug delivery, cosmetics, food chemistry or renewable energy. Modifications and functionalizations of such polymers are often necessary to achieve molecular structures of interest. In this area, the emergence of the “click” chemistry concept, and particularly the copper-catalyzed version of the Huis...

The alkyne zipper reaction is an internal-to-terminal isomerization with many interesting applications in synthetic chemistry, as it constitutes efficient means of achieving acetylene functionalization. A review its synthesis processes presented this paper, a brief overview the mechanistic features reaction, well future potential.

bisphenol a, 2,2-bis(4,4-dihyroxyphenyl propane) is the raw material for the production of important synthetic polymers such as epoxyresins, polycarbonates and polysulphones. during the last twenty years the anual production of bisphenol-a has been continuously increasing. a,b,c cqrves shows the consumption pattern of bisphenol-a (19601972) • epoxy resins are used for the production of adhessiv...