PPT-PHENOLS

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 . 25 bleach concentrate Phenols Quaternary Ammonium Compounds Accelerated Hydrogen Peroxide hydrogen peroxide anionic surfactants Botanicals Example Benefect Thymol Silver Dihydrogen Citrate Example PureGreen 24 Product Description EPA registered chl YX = 0 1 o 2 = 1 2 o 3 henol, styrenated (96- O -- cresol) OHp US EPA, Office of Pollution Prevention and Toxics. Development of Chemical Categories, Chemical RightKnow Initiative. ht Issue in Honor of Pr of. Irina Be letskaya ARKIVOC 2008 (i v) 33-46 a solid state 13 C CPMAS NMR study Concepci 8041A - 2Revision 1 :Three phenols failed to derivatize using the PFBBr procedure: 2,4-dinitrophenol, 2-1.5The following analytes may also be analyzed by this method:CompoundCAS No.2-Chloro-5-methylp . Dr. V. K. . Rao. Indian Institute of Horticultural Research,. Bangalore, India. Introduction. It is a major spice crop in India and some other countries. It is used for its pungency, . flavour. and . 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 . Introduction Phenols of anthropogenic origin exist in the environment due to the activity of the chemical, petrol, tinctoral or phar - maceutical industries. The compounds penetrate ecosystems as th 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.. . Dr. V. K. . Rao. Indian Institute of Horticultural Research,. Bangalore, India. Introduction. It is a major spice crop in India and some other countries. It is used for its pungency, . flavour. and . 1. Chapter 21. Phenols and Aryl Halides. Nucleophilic Aromatic Substitution. Ch. . 21. . - . 2. About The Authors. . These PowerPoint Lecture Slides were created and prepared by Professor William Tam and his wife, Dr. Phillis Chang. . 45. -Alcohols . have the general formula R. -. OH and are characterized by the presence of a . hydroxyl group, . -. OH. . -Phenols . have a hydroxyl group attached directly to an aromatic ring. . -Thiols . 1. Hydration of Alkenes - . addition of water. - uses H. 2. SO. 4. and heat. Ex.; Hydrate propene.. 2. Hydrogenation of Aldehydes & Ketones –. All . carbon-carbon double bonds in the molecule will be hydrogenated at the same time. 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. Department of Pharmaceutical Analysis. Chalapathi Institute of Pharmaceutical Sciences. The Structure of Benzene. Because each .  bond has two electrons, benzene has six  electrons.. In benzene, the actual bond length (1.39 .