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Topic: Cannizaro reaction

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Aldol condensation

Chemical reaction

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Formaldehyde

Chemical affinity

Electrophilic addition

Oxidation

Enol

Carboxylic acid

Enolate anion

Base (chemistry)

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Acetaldehyde

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	Cannizzaro reaction Information
		The Cannizzaro reaction named after Stanislao Cannizzaro is a chemical reaction that involves the base-induced disproportionation of an aldehyde lacking a hydrogen atom in the alpha position.
		RCHR'CHO, the preferred reaction is an aldol condensation, originating from deprotonation of this hydrogen.
		The first reaction step is nucleophilic addition of the base (for instance the hydroxy anion) to the carbonyl carbon of the aldehyde.
	www.bookrags.com /wiki/Cannizzaro_reaction (363 words)

	Reaction (Site not responding. Last check: 2007-10-09)
		Chain reaction A chain reaction is a reaction in which one of the agents necessary to the reaction is itself produced by...
		Diels-Alder reaction The Diels-Alder Reaction is an carbon.
		Hydroboration-oxidation reaction A hydroboration-oxidation reaction is a cation (H) anti-Markovnikov.
	www.brainyencyclopedia.com /topics/reaction.html (861 words)

	molecule. The Columbia Encyclopedia, Sixth Edition. 2001-05
		In a chemical reaction between molecular substances, the molecules are often broken apart into atoms or radicals that recombine to form other molecules, i.e., other substances.
		It was not until 1858 that the Italian chemist Stanislao Cannizaro suggested a merging of Avogadro’s and Dalton’s theories.
		The acceptance of this revised theory was assisted by the acceptance by physicists at about the same time of the kinetic-molecular theory of gases that was first proposed in 1738 by Daniel Bernoulli.
	www.bartleby.com /65/mo/molecule.html (992 words)

	LECTURE 5
		The cannizaro reaction is very slow and as such an advantage is taken of the time lag to synthesis polyhydroxy compounds using such aldehydes in cross-aldol condensation as carbanion acceptors.
		A controlled reaction of Aldol formation followed by elimination of water is called the Claisen-Schmidt condensation of aromatic aldehydes with aliphatic aldehydes or ketones in the presence of 10% mineral alkali.
		In aldol condensation, nucleophilic attack leads to addition, which is a typical reaction of aldehydes and ketones, whereas in claisen condensation, the nucleophilic attack leads to substitution, which is also the typical reaction of acyl compounds.
	www.uiowa.edu /intlinet/unijos/departments/pharmacology/additional.htm (1340 words)

	Indiatimes Learning..........Excel@Exams /Chemistry (Site not responding. Last check: 2007-10-09)
		Therefore the double bond character of the carbon - oxygen bond in carboxylic acid is greatly reduced because of resonance and hence they do not show same of the characteristics reactions of carboxyl group.
		Write reaction equations and conditions to support your answer.
		Ans21) (i) Sandmeyer reaction - This reaction is given by Benzene diazonium chloride where diazonium group can be replace by -Cl or -Br or -CN group.
	learning.indiatimes.com /test_papers/papers/chemistry/12th/1998/set1a16_a24.htm (689 words)

	Formaldehyde - LearnThis.Info Enclyclopedia (Site not responding. Last check: 2007-10-09)
		In the presence of basic catalysts, formaldehyde undergoes a Cannizaro reaction to produce formic acid and methanol.
		Formaldehyde reversibly polymerizes to produce its cyclic trimer, 1,3,5-trioxane or the linear polymer polyoxymethylene.
		Formaldehyde kills most bacteria, and so a solution of formaldehyde in water is commonly used as a disinfectant or to preserve biological specimens.
	encyclopedia.learnthis.info /f/fo/formaldehyde.html (757 words)

	cannizaro reaction
		That compound might be too sterically hindered to undergo the Cannizaro reaction.
		I do think that other aldehydes can undergo the Cannizaro reaction though, not just formaldehyde and benzaldehyde.
		There is another reaction analogous to Cannizzaro reaction, namely Tishchenko reaction in which aldehydes with alpha-hydrogen also react to form esters (not free acid and alcohol)
	www.chemicalforums.com /index.php?topic=2471.0 (305 words)

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