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UNIT 4
UNIT 4

... Sodium hydroxide, aqueous silver nitrate this produces a precipitate. Ammonia is then added to make aqueous [Ag(NH3)2]+ This is reduced to silver when an aldehyde is added. Fehling’s Solution This is a blue solution containing Cu2+ ions. When aldehydes are added and heated, these ions are reduced to ...
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Honors Chemistry Name Julien Period _____ Date Chapter 17
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... contain a benzene ring with a single substituent are usually named as benzene derivatives. However, many of these compounds have been important for many years and still use their common names. Names such as toluene, aniline, and phenol are allowed by IUPAC rules. STEP 2: Number the aromatic ring st ...
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Survival Organic Chemistry Part I: Molecular Models

... butane. Watch out that you do not make a comformer, which is a different spacial arrangement of a compound but contains the same arrangement of carbon-carbon bonds. Use the space below, and on the next page, to draw the Lewis structure for each of the compounds and any structural isomers they may ha ...
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... same molecular formula, but different structures, is called isomerism • Theses structures are called isomers ...
< 1 ... 36 37 38 39 40 41 42 43 44 ... 89 >

Phenols



In organic chemistry, phenols, sometimes called phenolics, are a class of chemical compounds consisting of a hydroxyl group (—OH) bonded directly to an aromatic hydrocarbon group. The simplest of the class is phenol, which is also called carbolic acid C6H5OH. Phenolic compounds are classified as simple phenols or polyphenols based on the number of phenol units in the molecule.Synonyms are arenols or aryl alcohols.Phenolic compounds are synthesized industrially; they also are produced by plants and microorganisms, with variation between and within species.Although similar to alcohols, phenols have unique properties and are not classified as alcohols (since the hydroxyl group is not bonded to a saturated carbon atom). They have higher acidities due to the aromatic ring's tight coupling with the oxygen and a relatively loose bond between the oxygen and hydrogen. The acidity of the hydroxyl group in phenols is commonly intermediate between that of aliphatic alcohols and carboxylic acids (their pKa is usually between 10 and 12).Loss of a positive hydrogen ion (H+) from the hydroxyl group of a phenol forms a corresponding negative phenolate ion or phenoxide ion, and the corresponding salts are called phenolates or phenoxides, although the term aryloxides is preferred according to the IUPAC Gold Book. Phenols can have two or more hydroxy groups bonded to the aromatic ring(s) in the same molecule. The simplest examples are the three benzenediols, each having two hydroxy groups on a benzene ring.Organisms that synthesize phenolic compounds do so in response to ecological pressures such as pathogen and insect attack, UV radiation and wounding. As they are present in food consumed in human diets and in plants used in traditional medicine of several cultures, their role in human health and disease is a subject of research.ref name=Klepacka Some phenols are germicidal and are used in formulating disinfectants. Others possess estrogenic or endocrine disrupting activity.
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