PPT-Phenols What is phenol? Phenols

Objective To know what phenol is Success criteria Recognise phenol compounds Recall the reaction of phenol with bromine water Compare the reactions of phenols to that of bromine Explain the difference in reactivity between phenols and benzene. and how to identify them. 2. Classification. Primary. : carbon with –OH is bonded to one other carbon. Secondary. : carbon with –OH is bonded to two other carbons. Tertiary. : carbon with –OH is bonded to three other carbons. Ar. -OH). Phenols . are compounds of the general formula . Ar. -OH, where . Ar. - is phenyl, substituted phenyl, or one of the other aryl groups. . I. Structure . and nomenclature:. Phenols . differ from alcohols in having the -OH group attached directly to an aromatic . Alcohol . – alkyl chain attached to an –OH. . R-OH. Phenol . - aromatic attached to an –OH. Nomenclature. 1. Name the longest chain of carbons which includes the carbon with the hydroxyl group.. Thiols. , . and ethers. Nomencalture. of alcohols. Use the end . ol. Examples. . Hydrogen bonding in alcohols and phenols. Alcohols and phenols form hydrogen bonds, and hence they have relatively high boiling points. This also makes the lower alcohols miscible with water. As the R group becomes larger, the solubility of alcohols in water decreases dramatically.. PHENOLS. Alcohols and Phenols. Alcohols contain an OH group connected to a . a. saturated C (sp. 3. ). They are important solvents and synthesis intermediates. Phenols contain an OH group connected to a carbon in a benzene ring. In a phenol the OH group is directly attached to the benzene ring. . In a phenol the lone pair of electrons on the oxygen is delocalised with the electron charge cloud of the . arene. ring. . The delocalised bonding changes the reactivity of the OH group and the . Chapter . 13. Alcohols, Phenols, . Thiols. , and Ethers. Anesthesia is typically administered by a nurse anesthetist who provides care before, during, and after a medical procedure. A nurse anesthetist gives medications to keep a patient asleep and pain-free while monitoring the patient’s vital signs. Phenols are organic compounds with a hydroxyl group attached directly to an aromatic ring. They have the general formula . Ar. -OH. Examples of them include phenol, hydroquinone, resorcinol,. o. -cresol, . Jamshedpur Cooperative College Jamshedpur. B. Sc. (. Chem. . Hons. ) Semester III. Outline. Nomenclature. Structure. Synthesis. Physical and Chemical Properties. Nomenclature. Phenols . are defined as compounds having hydroxyl group attached directly to a benzene nucleus. Its general formula is . Alcohols contain an OH group connected to a . a. saturated C (sp. 3. ). They are important solvents and synthesis intermediates. Phenols contain an OH group connected to a carbon in a benzene ring. Methanol, CH. J. Princess . Gracia. , M.. Sc. .,M.Phil.,. Assistant Professor,. Department of . Chemistry,. Bon Secours College for Women, . Thanjavur. .. Introduction-. . Phenols also called as phenolics are a class of chemical compounds consisting of a hydroxyl group (-OH) bonded directly to an aromatic hydrocarbon group.. activation of C-H bonds of . phenols. . catalyzed. by . copper. -amine complexes. Mebrouka. . Dekhici,. a,b. Didier . Villemin. a. *, Nawel . Cheikh. b,c. , Nathalie Bar. a. a . Laboratoire de Chimie Moléculaire et . Dr. Geeta Singh. Assistant Professor. Department of Chemistry. D.D.U. Gorakhpur University, Gorakhpur. 1. Fungicides. . Fungicides . are those compounds which are used to protect plants effected from fungi. . Dr.Baqer A. Al-Mayyahi. 1. Phenolic Resin. Introduction. Phenolic resins are obtained by the reaction of phenols with aldehydes. Both parent compounds, phenol and formaldehyde, are by far the most important components in commercial phenolic resin production .