Chromate ester

A chromate ester is a chemical structure that contains a chromium atom in a +6 oxidation state that is connected via an oxygen linkage to a carbon atom. The Cr itself is in its chromate form, with several oxygens attached, and the Cr–O–C attachment makes this chemical group structurally similar to other ester functional groups. They can be synthesized from various chromium(VI) metal compounds, such as CrO₃, chromium chloride complexes, and aqueous chromate ions, and tend to react via redox reactions to liberate chromium(IV).

Chromate esters are the key reactive intermediates in the Jones oxidation the mechanistically related oxidations using pyridinium dichromate or pyridinium chlorochromate. Chromate esters of allyl alcohols may isomerize via formal [3,3]-sigmatropic shift to give rearranged enone products.^[1]

An example of an isolable chromate ester is ((CH₃)₃CO)₂CrO₂.^[2]

References

1. ^ Carruthers, W.; Coldham, I. (2004). Modern Methods of Organic Synthesis (4th Edition ed.). p. 381. ISBN 9780521770972. 
2. ^ Fillmore Freeman, "Di-tert-butyl Chromate" Encyclopedia of Reagents for Organic Synthesis, 2001, John Wiley & Sons, Ltd. doi:10.1002/047084289X.rd059m

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This chemical reaction article is a stub. You can help Wikipedia by expanding it.v · Categories: Chromium compounds Esters Ester stubs Chemical reaction stubs Wikimedia Foundation. 2010. Игры ⚽ Поможем сделать НИР Chromate and dichromate chromatic (programmer) Look at other dictionaries: chromate — [krō′māt΄] n. [ CHROM(IUM) + ATE2] 1. a salt of chromic acid, containing the divalent, negative radical CrO4 2. an uncharged ester of this acid …   English World dictionary chromate — [1] A salt or ester of chromic acid which is often used as a paint pigment. [2] The action of treating metal with a solution of chromium compound to produce a protective metal chromate coating. Also called chromatize …   Dictionary of automotive terms chromate — chro·mate || krəʊmeɪt n. salt or ester of chromic acid (Chemistry) …   English contemporary dictionary chromate — n. Chem. a salt or ester of chromic acid …   Useful english dictionary Oxidation with chromium(VI)-amine complexes — involves the conversion of alcohols to carbonyl compounds or more highly oxidized products through the action of chromium(VI) oxide amine adducts and salts. Representative members of this family of reagents include Collins reagent, pyridinium… …   Wikipedia ALCOOLS — Le mot alcool, de l’arabe al khoul ou al koh’l , désignait à l’origine une poudre très fine à base de stibine (sulfure d’antimoine). À ce mot s’attacha une idée de finesse et de subtilité, de sorte que les alchimistes l’appliquaient aussi bien à… …   Encyclopédie Universelle CARBONYLÉS (DÉRIVÉS) — Le terme d’alcool déshydrogéné, dit par contraction aldéhyde , a tout d’abord été employé pour nommer un liquide très volatil et d’une odeur pénétrante provenant de l’oxydation ménagée de l’alcool éthylique et se différenciant de celui ci par un… …   Encyclopédie Universelle -ate — Suffixe employé en chimie, pour former des substantifs (ex. sulfate, carbonate). ⇒ ATE, suff. Suff. utilisé en chim. et formateur de subst. masc. I. Sert à désigner les sels ou esters obtenus par l action d un acide en ique (acide plus oxygéné… …   Encyclopédie Universelle Paint stripper — Paint stripper, or paint remover, is the generic name given to solvent mixtures designed to remove paint and other finishes and also to clean the underlying surface. The principal active ingredient is usually dichloromethane. Formulations with… …   Wikipedia Sekundärer Alkohol — Die funktionelle Gruppe der Alkohole Als Alkohole (aus dem Arabischen al kuhūl الكحول, oder al ghawl الغول: „das Allerfeinste“ (Antimonpulver), „reine Substanz“, „Essenz“) bezeichnet die Chemie organische Verbindungen, die mindestens eine… …   Deutsch Wikipedia 18+ © Academic, 2000-2024 Contact us: Technical Support, Advertising Dictionaries export, created on PHP, Joomla, Drupal, WordPress, MODx. Mark and share Search through all dictionaries Translate… Search Internet Share the article and excerpts Direct link … Do a right-click on the link above and select “Copy Link”