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Topic: Azo compound

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Azo

Radical initiator

Imine

Free radical

Functional group

International Nonproprietary Name

	Azo Compounds - LoveToKnow 1911
		The azo compounds are intensely coloured, but are not capable of being used as dyestuffs unless they contain salt-forming, acid or basic groups (see Dyeing).
		Azoxy Compounds, R N O N R', are usually yellow or red crystalline solids which result from the reduction of nitro or nitroso compounds by heating them with alcoholic potash (preferably using methyl alcohol).
		The mixed azo compounds are those in which the azo group N: N is united with an aromatic radical on the one hand, and with a radical of the aliphatic series on the other.
	www.1911encyclopedia.org /Azo_Compounds (1780 words)

	***TBD***
		Compounds which are azo dyes existing either in a semi-crystalline form or in a transition state between crystalline solid and normal liquid, i.e., having the appearance of being crystals while having the viscosities to behave mechanically as liquids, and which usually show different colors.
		Compounds wherein a pentavalent nitrogen having four bonds to carbons or three bonds to carbons and one to an additional nitrogen is attached indirectly to an azo group by nonionic bonding.
		Compounds which are azo compounds having a group capable of reacting with a group of a fiber or a substrate to form a nonionic bond, e.g., reacting with a hydroxy group of cellulose or an amino group of a polyamide, etc.
	www.uspto.gov /go/classification/shadowFiles/defs534sf.htm?534_7&S&1&2 (3043 words)

	Azo metal chelate compound - Patent 5532342
		Then, the azo compound and the metal salt are reacted in water and/or an organic solvent, such as dioxane, tetrahydrofuran, acetone, ethanol or methanol, to obtain an azo metal chelate compound of the present invention.
		A solution obtained by using a compound as identified in Table 1 instead of the compound used in Example 1, was coated on a substrate, to obtain an optical recording medium having a coating layer with the maximum absorption wavelength as identified in Table 1.
		The metal chelate compound of an azo compound of the present invention has a high level of solubility to an organic solvent, so that it can be applied by coating in the form of a coating solution, and yet it has good sensitivity and excellent light resistance and storage stability.
	www.freepatentsonline.com /5532342.html (5995 words)

	Azo compound suitable for use in non-linear optics - Patent 5047516
		A compound according to claim 1 in which R is a group containing from 8 to 20 carbon atoms consisting of an unsubstituted alkyl, alkenyl or cycloalkyl group or such group interrupted by one oxygen or sulphur atom for every twelve carbon atoms, or substituted by halogen.
		The compound of Formula I is non-centrosymmetric and substantially polarised along its longitudinal axis because the carboxyl, nitro and cyano groups are electron-withdrawing and the N-alkylcarboxylate group is electron-donating.
		Where the monolayers of the present NLO compound are adjacent, the N-alkylcarboxylate groups of the molecules in one monolayer will be adjacent to the aliphatic groups (R) in the adjacent monolayer ("head to tail" array).
	www.freepatentsonline.com /5047516.html (2173 words)

	DIAZO COMPOUNDS,
		Diazonium compounds in pure and dry form are usually unstable and have sometimes been used as explosives.
		The compounds readily undergo a wide variety of reactions and are therefore of great importance in organic syntheses.
		The new compound thus formed is called an azo compound or azo dye.
	www.history.com /encyclopedia.do?articleId=207543 (595 words)

	Azo Compound - MSN Encarta
		Azo compounds are compounds bearing the functional group R-N=N-R', in which R and R' can be either aryl or alkyl.
		The N=N group is called an azo group, although the parent...
		The azo group absorbs light and gives diverse colors to compounds.
	encarta.msn.com /encyclopedia_761579158/Azo_Compound.html (130 words)

	R-5.3.3 Azo, azoxy, diazo, and related compounds
		Bisazo compounds and more complex analogues are named on the basis of the parent structure "diazene", in the absence of a more preferred parent compound.
		In an unsymmetrical compound, the position of the azoxy oxygen atom is expressed by the locant 1 or 2
		Compounds containing a group N2 attached by one nitrogen atom to one carbon atom are named by adding a prefix "diazo-" to the name of the parent hydride.
	www.acdlabs.com /iupac/nomenclature/93/r93_377.htm (373 words)

	Photoresponsive heterocyclic azo compound, method for producing the same, and optical information recording medium ...
		<5> The photoresponsive heterocyclic azo compound according to any one of <1> to <4>, wherein at least one of HC.sup.1 and HC.sup.2 is a 5-membered heterocyclic structure selected from the group consisting of pyrrole, imidazole, pyrazole, triazole, thiophene, thiazole, thiadiazole, furan, oxazole, and isoxazole structures, which may be hydrogenated.
		<6> The photoresponsive heterocyclic azo compound according to any one of <1> to <5>, wherein at least one of HC.sup.1 and HC.sup.2 is a 6-membered heterocyclic structure selected from the group consisting of pyridine, diazine, triazine, thiopyran, thiazine, thiadiazine, pyran, and oxazine structures, which may be hydrogenated.
		<9> The photoresponsive heterocyclic azo compound according to <8>, wherein the carbon chain of the main chain is formed by polymerization of a monomer having the building block represented by the formula (1) and a polymerizable group or by copolymerization of the monomer and another monomer having a polymerizable group.
	www.freshpatents.com /Photoresponsive-heterocyclic-azo-compound-method-for-producing-the-same-and-optical-information-recording-medium-dt20071018ptan20070242322.php (1793 words)

	Azo compound - Wikipedia, the free encyclopedia
		The N=N group is called an azo or diimide functional group.
		Therefore, they are used as dyes, which are called azo dyes.
		Owing to this process, some aliphatic azo compounds are utilized as radical initiators.
	en.wikipedia.org /wiki/Azo_compound (402 words)

	General Chemistry Online: Glossary: Introduction to organic chemistry
		An alcohol is an organic compound with a carbon bound to a hydroxyl
		An aldehyde is an organic compound with a carbon bound to a -(C=O)-H group.
		Compounds containing the azo compounds are often intensely colored and are economically important as dyes.
	antoine.frostburg.edu /chem/senese/101/organic/glossary.shtml (1975 words)

	Molecular Cloning and Characterization of the Gene Coding for the Aerobic Azoreductase from Xenophilus azovorans KF46F ...
		reduction of azo compounds to the corresponding amines.
		the reduction of the azo dyes to the corresponding hydrazo compounds.
		The reduction of azo dyes by the intestinal microflora.
	aem.asm.org /cgi/content/full/68/8/3948 (4630 words)

	General Chemistry Online: Glossary
		Azo compounds have the general structure Ar-N=N-Ar', where Ar and Ar' indicate substituted benzene rings.
		Azo compounds are often intensely colored and are economically important as dyes.
		An ester is a compound formed from an acid and an alcohol.
	antoine.frostburg.edu /chem/senese/101/organic/glossary.html (444 words)

	AZO COMPOUNDS - Online Information article about AZO COMPOUNDS
		azo compounds are intensely coloured, but are not capable of being used as dyestuffs unless they contain See also:
		It is an orange-red crystalline compound which melts at 1 54° C.
		Azoxy Compounds, R-N•O•N•R'•, are usually yellow or red crystalline solids which result from the reduction of nitro or nitroso compounds by See also:
	encyclopedia.jrank.org /AUD_BAI/AZO_COMPOUNDS.html (1971 words)

	Diazonium Coupling Reaction
		This compound was once used as a food coloring agent but has been declared a suspect carcinogen by the Food and Drug Administration.
		The formation of the azo compound is a very slow reaction, but the rate of formation is increased by raising the pH of the solution.
		In the experiment, a point is made that the formation of azo compound is a slow reaction, but that the rate is increased by raising the pH of the solution.
	www.owlnet.rice.edu /~chem215/MethylRed.html (1216 words)

	Azo Dyes
		One of the most important structural types of synthetic dyes are azo compounds.
		The typical azo dye consists of two aromatic units joined by a dinitrogen bridge.
		The synthesis of an azo compound begins with the conversion of an aromatic amine (an aniline derivative) into a diazonium salt using concentrated acid then nitrite ion in aqueous solution.
	www.chem.pacificu.edu /Projects2004/Pages/AzoDye.htm (474 words)

	A-level Chemistry/OCR (Salters)/Functional groups - Wikibooks, collection of open-content textbooks
		This compound contains an ester group that is part of a ring.
		For example, amides are normally very unreactive, but the amide group in a β-lactam ring is relatively easily hydrolysed because the four-membered ring is very strained and hydrolysis converts the ring to a straight chain, relieving the strain.
		Cyclic compounds are often formed by intramolecular reactions, meaning reactions in which different parts of the same molecule react with each other.
	en.wikibooks.org /wiki/A-level_Chemistry/OCR_(Salters)/Functional_groups (281 words)

	Rule C-912. Azo compounds: Chemical Abstracts method
		912.2 - When each group R in the azo compound RN=NR is (a) identical when unsubstituted and (b) carries the same number of the same group that is to be cited as suffix, then the azo compound is named as an assembly of identical units (see Subsection C-0.7).
		The name of the unsubstituted parent compound is preceded by a prefix "azodi-", and this is preceded by prefixes for the other substituents; the group to be cited as suffix is placed last.
		The suffix has a locant as low as possible and, if a choice remains, lower locants are next given to the azo links; the higher azo locant is primed, and so are the locants of any other substituents in the ring whose azo locant is primed.
	www.acdlabs.com /iupac/nomenclature/79/r79_602.htm (366 words)

	some reactions of diazonium ions
		The product is one of the simplest of what are known as azo compounds, in which two benzene rings are linked by a nitrogen bridge.
		These strongly coloured azo compounds are frequently used as dyes known as azo dyes.
		Azo compounds contain a highly delocalised system of electrons which takes in both benzene rings and the two nitrogen atoms bridging the rings.
	www.chemguide.co.uk /organicprops/aniline/propsdiazo.html (1257 words)

	Azo Dye
		A dyeing technique in which an insoluble azo dye is produced directly onto or within the fibre.
		The azo compound class accounts for 60-70% of all dyes.
		Azo dyes give bright, high intensity colours, much more so than the next most common dye class (anthraquinones).
	www.greatvistachemicals.com /dyes_and_pigments/azo_dye.html (392 words)

	Azo compound Summary and Analysis Summary
		The azo group contains two nitrogen atoms joined by a triple bond (R--N N--R); the diazo group has two nitrogens with a double bond (R=N=N); the azine group has a carbon...
		Azo compounds refer to synthetic inorganic chemical compounds bearing the functional group R-N=N-R', in which R and R' can be either aryl or alkyl.
		The N=N group is called an azo or diimide (diimide is also the name for the compound HN=NH).
	www.bookrags.com /Azo_compound (192 words)

	Benzene Diazonium Salts - Azo Dyes
		In azo compounds the -N=N- group is part of an extended delocalised electron system involving the aromatic rings, called a chromophore.
		The azo compound then appears a colour corresponding to the unabsorbed visible light.
		The benzene diazonium cation behaves as an electrophile, but it is a weak electrophile and so the aromatic ring which it attacks must have attached to it an activating group such as -OH or -NH An electrophilic substitution reaction occurs to form an azo-dye.
	www.avogadro.co.uk /organic/azodyes/azodyes.htm (686 words)

	ELECTROCHEMICAL REDUCTION OF
		From these results it is concluded that the title azo compound is reduced electrochemically in a diffusion –controlled irreversible CV wave involving a transfer of two electrons.
		for the titl azo compound, as a function of scan rate it decreases as the scan rate increase.
		The data obtained through simulation – fitting for the title azo compound at pH's 2.18, 7.11 α 9.31 are summarized in Table 1.
	www.acadjournal.com /2005/V14/part2/p4 (1744 words)

	Diazotype composition stabilization (Site not responding. Last check: )
		Diazotype material comprising a light-sensitive diazonium compound, an azo coupler compound, and a stabilizing amount of a compound selected from the group consisting of caprolactam, caprylolactam, and azacylooctanone.
		Material according to claim 1 wherein said stabilizing compound is present in an amount which is between about 10% and 400% of the combined weight of said diazonium and coupler compounds.
		Material according to claim 1 or 2 which comprises an intimate mixture of said diazonium, azo, and stabilizing compounds.
	www.well.com /~youlee/diazotype_composition_stabilization (163 words)

	Azo coupling: Click here to learn more about Azo coupling from iRazoo.com
		An azo coupling is an organic reaction between a diazonium compound and an aniline or a phenol.
		Azo coupling is the most widely used industrial reaction in the production of...
		Aromatic azo compounds can be synthesized by using an azo coupling reaction,...
	www.irazoo.com /InterestingTopics/Azo-coupling.aspx (636 words)

	2. Azo-colorants in Textile Dyeing and Printing, Danish Environmental Protection Agency
		Azo-colorants are a group of chemical compounds, containing one ore more azo-group(s).
		First the aromatic amine (in Figure 2.2 also called diazo component) is transformed into a diazonium compound.
		The behaviour of the azo-colorant is determined by thie character of substituent groups rather than by the presence of the azo group.
	www.mst.dk /udgiv/Publications/1998/87-7909-136-9/html/kap02_eng.htm (1231 words)

	Anthracene dyes
		, arrows in the formulae of the various types of azo dyes indicate which part of an azo dye, prepared by diazotising and coupling, is derived from the diazo component and which part is derived from the coupling component.
		Obtaining compounds having alkyl radicals, or alkyl radicals substituted by hetero atoms, bound to the phthalocyanine skeleton
		Obtaining compounds having &emdash;COOH or &emdash;SO H radicals, or derivatives thereof, directly bound to the phthalocyanine radical
	www.wipo.int /ibis/ipc7en/c09b.xml?mg=C09B03500 (1918 words)

	Azo - Wikipedia, the free encyclopedia
		Azo may refer to a number of topics:
		For the chemistry functional group and class of compounds, see Azo compound.
		For the Georgian culture hero, see Azo (Georgian history).
	en.wikipedia.org /wiki/Azo (137 words)

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