| Glycol |
Articles about Diol |
Information AboutGlycol |
| CATEGORIES ABOUT DIOL | |
| functional groups | |
| polyols | |
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Vicinal diols have hydroxyl groups Bonded to Atom s next to each other, i. e. bonded to each other. Examples of vicinal diol compounds are Ethylene Glycol and Propylene Glycol . Geminal diols have hydroxyl groups bonded to the same atom. When the atom is a Carbon atom in an Organic Compound , the diol section of the Molecule is unstable and has a tendency to dehydrate forming a Carbonyl Group . For example, Carbonic Acid (HO-CO-OH) is unstable and has a tendency to convert to Carbon Dioxide (CO2) and water (H2O). Only when Formaldehyde (H-CO-H) is dissolved in Water is the Chemical Equilibrium in favor of the geminal diol version of the compound {Link without Title} . SYNTHESIS OF DIOLS Diols can be produced from the Oxidation of Alkene s, usually with dilute Acidic Potassium Permanganate known as potassium manganate(VII) . Using acidic potassium manganate(VII) produces a colour change from clear deep purple to clear green; acidic potassium manganate(VII) turns clear colourless. Osmium Tetroxide can similarly be used to oxidize alkenes to diols. A chemical reaction called Sharpless Bishydroxylation can be used to yield Chiral diols from alkenes using an osmate Reagent and a chiral Catalyst . In the Prins Reaction 1,3-diols can be formed in a reaction beteen an Alkene and Formaldehyde . REACTIONS A diol reacts like an Alcohol . Diols such as Ethylene Glycol are used as co- Monomer s in some Polymerization reactions forming Polymer s such as certain Polyester s and Polyurethane s. Glycol Cleavage EXAMPLES
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