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Topic: Iodoform reaction

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Iodoform

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	Enolization
		In reaction 4, each of the three hydrogens on the methyl group attached to the carbonyl carbon is replaced by an iodine atom.
		This is a nucleophilic substitution reaction in which the enolate ion acts as a nucleophile and displaces a bromide ion from the dibromine.
		In the iodoform reaction, the exchange of the three methyl hydrogens for iodine atoms produces a triiodomethylketone.
	www.usm.maine.edu /~newton/Chy251_253/Lectures/Enolization/Enolization.html (1246 words)

	Haloform reaction - Wikipedia, the free encyclopedia
		In analytical chemistry, this reaction was traditionally used to determine the presence of a methyl ketone, or a secondary alcohol oxidizable to a methyl ketone through the the iodoform test.
		The iodoform test or iodoform reaction is a qualitative chemical test for the detection of ketones and aldehydes carrying an alpha methyl group.
		The iodoform test is a laboratory test for the presence of a methyl ketone or the related alcohol, by formation of a pale yellow precipitate of iodoform.
	www.enpsychlopedia.com /psypsych/Iodoform_reaction (714 words)

	Haloform Reaction
		This reaction has been used in qualitative analysis to indicate the presence of a methyl ketone.
		The reaction has some synthetic utility in the oxidative demethylation of methyl ketones if the other substituent on the carbonyl groups bears no enolizable α-protons.
		The reaction readily proceeds to completion because of the acidifying effect of the halogen substituents.
	www.organic-chemistry.org /namedreactions/haloform-reaction.shtm (66 words)

	Iodoform reaction - Wikipedia, the free encyclopedia
		The reaction is a traditional laboratory test for methyl ketones.
		There are three steps to the iodoform reaction when starting from an alcohol.
		in a substitution reaction to produce a triiodoketone, for example triiodoacetone.
	en.wikipedia.org /wiki/Iodoform_reaction (157 words)

	Reaction dynamics
		The main goal with this project is to characterize how elementary steps of chemical reactions in the condensed phase are influenced by solvent interactions with reactants and intermediates as well as by the intramolecular properties of these.
		To be able to study reaction dynamics in real time it is essential to have means to initiate and follow the course of the events on a femtosecond time scale.
		The reaction can be initiated with a short laser pulse and then the course of the reaction followed as it proceeds by monitoring the spectral evolution associated with formation of intermediates and products.
	spider.chemphys.lu.se /kfresearch/rdynamics.html (1161 words)

	Media Portfolio
		The reaction is called base-promoted, rather than base-catalyzed, because a full equivalent of the base is consumed in the reaction.
		Iodoform is a yellow solid and its formation is used as a qualitative test for methyl ketones.
		Reaction of the a-brominated acyl bromide with a second molecule of acid will give the a-brominated carboxylic acid and a molecule of acyl bromide.
	wps.prenhall.com /wps/media/objects/340/348272/wade_ch22.html (1433 words)

	AllRefer.com - iodine, Compound & Element (Compounds And Elements) - Encyclopedia
		Iodine is important in medical treatment; tincture of iodine and iodoform are widely used.
		Silver iodide, a yellow salt, is used in photography; it is water insoluble and turns fl when exposed to light.
		Starch turns deep blue (almost fl) in the presence of a small amount of iodine; this reaction serves as a test for either starch or iodine.
	reference.allrefer.com /encyclopedia/I/iodine.html (536 words)

	[No title]
		Usually the reaction is carried out in acetic acid which acts as both the catalyst and the solvent.
		The iodoform reaction is the best known example of this reaction and was used as a test for methyl ketones prior to the widespread application of nmr spectroscopy.
		Chloroform, a suspected human carcinogen, is formed during the chlorination of public drinking water by the haloform reaction between the chlorine and humic acids which are the main organic constituents of soils.
	people.uis.edu /gtram1/organic/a-substitution/a-halogenation.htm (333 words)

	iodoform - Search Results - MSN Encarta
		The use of the triiodomethane (iodoform) reaction in testing for particular alcohols...
		This page looks at how the triiodomethane (iodoform) reaction can be used to identify the presence...
		The use of the triiodomethane (iodoform) reaction to test for the presence of a methyl group in...
	uk.encarta.msn.com /iodoform.html (127 words)

	triiodomethane (iodoform) reaction with aldehydes and ketones
		This page looks at how the triiodomethane (iodoform) reaction can be used to identify the presence of a CH CO group in aldehydes and ketones.
		Why the two reactions are equivalent: The reaction happens in two stages: first the aldehyde or ketone reacts with iodine, and the product of that reaction reacts with hydroxide ions.
		and the rest of the molecule is broken to produce triiodomethane (iodoform) and the salt of an acid.
	www.chemguide.co.uk /organicprops/carbonyls/iodoform.html (622 words)

	AS unit chains and rings alcohols page
		A concentrated mixture of halide ions and acid are used (for example, sodium chloride in concentrated sulphuric acid) along with heat, to ensure that the -OH group leaves the alcohol (as water) and the carbon atom will accept a Cl ion.
		It is a similar type of reaction to the neutralisation of an acid with a base.
		The iodoform test is a test for the existence of the CH -CO- group in a molecule.
	www.rjclarkson.demon.co.uk /candr/alcohols.htm (1088 words)

	Aldehydes and Ketones Chemistry Professor - Organic, Inorganic, High School, College, Chemistry Tutor - ...
		The reactions of aldehydes and ketones with Schiff’s bases produce a variety of compounds that may be easily identified by their melting points and sometimes by their appearance.
		Other reactions of carbonyls are addressed: reactions in a strong acid, oxidation, reduction (using Clemmensen, Wolff-Kishner, 9-BBN, sodium borohydride, and lithium aluminum hydride), the Grignard addition, and reaction with water.
		The steps in the iodoform reaction: oxidation, halogenation, and cleavage are addressed in such a manner as to clarify the key structures that will allow this reaction.
	chemistryprofessor.com /Aldehydes_and_Ketones.htm (564 words)

	iodoform - Encyclopedia.com
		important organic reactions, as undergraduates quickly learn when early on they have to grapple with the complexities of the iodoform reaction or the aldol condensation.
		The wound may be packed (usually with iodoform gauze) to encourage further drainage.
		Indeed, tincture of iodine, iodoform, or one of the iodides, was applied to almost every case that resisted the ordinary routine of practice; and between 1820 and...
	www.encyclopedia.com /doc/1E1-iodoform.html (1020 words)

	triiodomethane (iodoform) reaction with alcohols
		This page looks at how the triiodomethane (iodoform) reaction can be used to identify the presence of a CH CH(OH) group in alcohols.
		Note: This reaction can also be used in testing for the CH CO group in aldehydes and ketones.
		After that the reaction happens in two further stages: first the aldehyde or ketone formed reacts with iodine, and the product of that reaction reacts with hydroxide ions.
	www.chemguide.co.uk /organicprops/alcohols/iodoform.html (685 words)

	Alkenes (Site not responding. Last check: 2007-10-26)
		This reaction is also used to identify the presence of alcohols with a methyl group attached to the carbon bonded to the Hydroxyl group(carbinol carbon) of the alcohol as well as methyl ketones.
		The reaction of a Carboxylic Acid with an alcohol is an alcoholysis reaction which results in an ester being formed.
		The reaction is relatively slow sometimes requiring a catalyst for reasonable yields and also a period of refluxing.
	members.aol.com /logan20/carbox.html (1191 words)

	Investigate the chemical properties of alkanals and alkanones.
		Ethanal is most reactive to Iodoform reaction, followed by Propanone and phenylethanone, while methanal and Benzaldehyde do not have any reaction.
		This reaction is very sensitive to steric hindrance and is limited to aliphatic aldehydes and sterically unhindered ketones.
		For Part B, the reaction with 2, 4-dinitrophenylhydrazine is an addition-elimination (condensation) reaction.
	www.coursework.info /i/51808.html (451 words)

	Iodoform Reaction - Test for the alpha-Methyl Carbonyl Group
		Iodoform is harmful by ingestion, inhalation and through skin contact.
		A yellow, crystalline precipitate is formed in each of the three conical measures.
		The iodoform reaction is characteristic for methylketones as well as for alcohols (e.g.
	www.uni-regensburg.de /Fakultaeten/nat_Fak_IV/Organische_Chemie/Didaktik/Keusch/D-Jodof-e.htm (469 words)

	Carbonyl Compounds
		The reaction of compounds of the type HX with carbonyl
		The reaction of ethanal with HCN(aq) is slow, but a rapid
		this is that the first step of the reaction involves attack of
	bosonciccouk.site.securepod.com /31_1.cfm (248 words)

	Molecule of the Day : Iodoform (Wet tests and sterile gauze)
		Iodoform is, as the name suggests, the iodine analogue to chloroform.
		Another notable application of iodoform, also antiquated, is the iodoform reaction.
		This is one of a number of "wet tests" that were once used to characterize compounds.
	www.scienceblogs.com /moleculeoftheday/2006/10/iodoform_wet_tests_and_sterile.php (500 words)

	Bismuth (UK PID)
		Injection - Historically, the parenteral administration of bismuth salts has led to cardiovascular collapse (probably a Herxheimer reaction), renal failure, a blue gumline, stomatitis, generalised skin eruptions, osteoporosis, spontaneous fractures and jaundice.
		The use of bismuth subgallate, as a powder, ointment or paste in the topical treatment of eczema and other skin complaints has long been abandoned but bismuth iodoform paraffin paste (containing bismuth subnitrate or carbonate) is still used in surgical dressings.
		Neurotoxicity Neuropsychiatric symptoms have occurred following the use of bismuth iodoform paraffin paste packs (Lee et al, 1990; Bridgeman and Smith, 1994; Sharma et al, 1994) and in patients using skin creams containing bismuth.
	www.intox.org /databank/documents/chemical/bismuth/ukpid49.htm (5516 words)

	Iodoform (Site not responding. Last check: 2007-10-26)
		For more details about reaction, look at reaction mechanism of iodoform formation.
		Precipitated yellow crystals of iodoform are filtered after 30 minutes, washed with water and dried in air.
		Iodoform is solid crystalline substance with a specific smell and melting point of 119
	www.frogfot.com /synthesis/iodoform.html (126 words)

	Answer 2 (Site not responding. Last check: 2007-10-26)
		Both substances B and C give the iodoform reaction, and C is an aldehyde.
		The only aldehyde to do this is ethanal, CH and since this is produced by careful oxidation of B, B must be ethanol which also gives the iodoform reaction since it is oxidised to ethanal under the conditions of the iodoform test.
		The products from the reaction of sodium hydroxide with A are therefore ethanol and sodium benzoate; A must be an ester, so is ethyl benzoate.
	home.clara.net /rod.beavon/answer2.htm (190 words)

	President Harry Truman : Health & Medical History
		The family doctor reattached it using a coating of iodoform.
		In 1954 Truman had a gall bladder attack while watching a play.
		After his gall bladder operation, Truman received an antibiotic that caused a severe allergic reaction.
	www.doctorzebra.com /prez/g33.htm (1604 words)

	Scientific Articles Collected by Ian Fleming IU Lilly Library
		"On some distinguishing reactions of arsenical and antimonial spots" by J. Slater, excerpt from Chemical gazette, in The chemist, vol.
		"On the augmentation of the power of a magnet by the reaction thereon of currents induced by the magnet itself," by Charles Wheat-stone, article no. 3, excerpt from Proceedings of the Royal Society of London, vol.
		"On the oxidising action of the rays from radium bromide as shown by the decomposition of iodoform," by W. Hardy and Miss E.
	www.indiana.edu /~liblilly/shorttitle/fleming.html (10138 words)

	[No title] (Site not responding. Last check: 2007-10-26)
		Upon treatment with I2/NaOH, A is oxidized and gives a positive iodoform reaction.
		Both B and C give precipitation when treated with 2,4-D, and only C gives positive reaction with Tollens reagent.
		Transform this into a Fischer projection formula and state whether it is a D or L configuration.
	folk.uio.no /johnv/26thIChO/problems/t6.html (163 words)

	Kalamazoo Valley Community College!
		Write out the products for the reactions that produce aldehydes and ketones.
		Explain the role of the nucleophile and that of the oxygen of the carbonyl group.
		Identify the reactions used to distinguish between aldehydes and ketones.
	puma.kvcc.edu /rsutton/chm230/Aldehydes_and_Ketones.htm (157 words)

	Microscale Chemistry Experimentation (Site not responding. Last check: 2007-10-26)
		* Observe the iodoform precipitate and a clear supernatant.
		You may remove the supernatant, stopper the vial and you will get a permanent preserved sample of iodoform.
		Reactions of methanol, ethanol and propanol with sodium
	www.micrecol.de /chemarsafE16.html (135 words)

	Aldehydes and Ketones
		Write an equation for the reaction of an aldehyde with Tollens’ reagent.
		Write a flow chart for the preparation of Tollens’ reagent.
		Write an equation for the reaction of a methyl ketone to form iodoform.
	www.hartnell.cc.ca.us /faculty/shovde/chem12b/aldehydesketones.htm (640 words)

	organic reactions
		All of the Classic Organic Reactions images were created with ChemPen software.
		After you have enjoyed viewing the reactions, please do visit the links below and learn about the software used to illustrate these pages.
		von Braun Degradations; von Braun Cyanogen Bromide Reaction
	www.chempensoftware.com /organicreactions.htm (97 words)

	Links (Site not responding. Last check: 2007-10-26)
		Reaction of Cyclohexene with Bromine and Permanganate (RealPlayer)
		Iodoform Reaction - Test for the alpha-Methyl Carbonyl Group (RealPlayer)
		Reaction of Butylbromide Isomers with Silver Nitrate (RealPlayer)
	www.chem.purdue.edu /chm257l/links.htm (69 words)

	[No title] (Site not responding. Last check: 2007-10-26)
		Add 0.5 ml of 10% NaOH solution, then add I2/KI solution dropwise until the brown color of I2 persists.
		If no precipitate appears, heat the reaction mixture to 60oC for 10 min.
		The IR spectrum should confirm the presence (or absence) of an aldehyde.
	www.uncwil.edu /chem/chmlab212martin/212exp24.ppt (718 words)

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