Gas-liquid chromatography, when used for heterocyclic compounds, opens up wide prospects for its analytical application. Highly polar and high-boiling substances can be chromatographed by using either diatomite brick treated with an alkali (content of the stationary phase 15–20%), or sodium ...
“circle”) of heterocyclic indicates that at least one ring structure is present in such acompound, while the prefix hetero- (from Greekheteros, meaning “other” or “different”) refers to the noncarbon atoms, orheteroatoms, in the ring. In their general structure, heterocycliccompounds...
Essential oil, highly volatile substance isolated by a physical process from an odoriferous plant of a single botanical species. The oil bears the name of the plant from which it is derived; for example, rose oil or peppermint oil. Such oils were called
A chemical-mechanical polishing (“CMP”) composition (P) comprising (A) inorganic particles, organic particles, or a mixture or composite thereof, (B) at least one type of A/-heterocyclic compound as corrosion inhibitor, (C) at least one type of a further corrosion inhibitor selected from ...
aAmong the 82 volatile compounds identified, 20 compounds including alcohols (3), acids (5), esters (1),aldehydes (1), ketones (2), phenols (4), heterocyclic compounds (4) were found to appear in different type soy sauce at different concentrations 在辨认的82种挥发性化合物之中, 20种化合...
aromatic molecules Radical substitution of heterocycles C -Metallated heterocycles as nucleophiles Generation of C -metallated heterocycles Dimethylformamide dimethyl acetal (DMFDMA) Formation and hydrolysis of imine/enamine Common synthetic equivalents of carbonyl compounds in ring synthesis Cycloaddition ...
Epoxy resins are typically formed by the reaction of compounds containing at least two active hydrogen atoms (polyphenolic compounds, diamines, amino phenols, heterocyclic imides and amides, aliphatic diols, etc.) and epichlorohydrin. The synthesis ofdiglycidyl ether of bisphenol A (DGEBA), the most...
When a compound, which consists of two or more elements or groups of elements, is broken down into its constituents, the reaction is called simple decomposition. When two compounds react with one another to form two new compounds, the reaction is called double decomposition. In so-called ...
Analgesic, any drug that relieves pain selectively without blocking the conduction of nerve impulses, markedly altering sensory perception, or affecting consciousness. This selectivity is an important distinction between an analgesic and an anesthetic. A
Cancer, group of numerous distinct diseases that are characterized by the uncontrolled multiplication of abnormal cells in the body. Cancer is a major cause of sickness and death worldwide. Learn more about the history of cancer, cancer rates and trends,