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Topic: Heterocyclic compound

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	Heterocyclic compound Summary
		Heterocyclic and homocyclic compounds are examples of molecules in which the constituent atoms form rings.
		Heterocyclic compounds are organic compounds that contain a ring structure containing atoms in addition to carbon, such as sulfur, oxygen or nitrogen, as part of the ring.
		Heterocycles with three atoms in the ring are more reactive because of ring strain.
	www.bookrags.com /Heterocyclic_compound (686 words)

	Introduction
		Heterocyclic compound is one witch possess a cyclic structure with at least two different kinds of atoms in the rings.The most common type, contain largely carbon atoms Nitrogen, Oxygen and Sulphur are the most common hetero atoms.
		Heterocyclic compounds are very widely distributed in nature, and essential to life in various ways.Most of sugar, and their derivatives including vitamin c, Vitamin B, Vitamin B
		Heterocyclic compounds can be aliphatic or Aromatic in character depending upon their electronic constituents.
	www.kaau.edu.sa /KBADAHDAH/335page1.htm (210 words)

	Heterocyclic Chemistry
		Compounds classified as heterocyclic probably constitute the largest and most varied family of organic compounds.
		After all, every carbocyclic compound, regardless of structure and functionality, may in principle be converted into a collection of heterocyclic analogs by replacing one or more of the ring carbon atoms with a different element.
		An important characteristic of aromaticity is enhanced thermodynamic stability, and this is usually demonstrated by relative heats of hydrogenation or heats of combustion measurements.
	www.cem.msu.edu /~reusch/VirtualText/heterocy.htm (4072 words)

	Immunoglobulin adsorbent and adsorption apparatus (Site not responding. Last check: 2007-11-02)
		The hetero-atoms of the pyridines, pyrimidines and azoles which are the preferred heterocyclic compounds used in the practice of the present invention have a lone pair and act as a proton acceptor.
		The heterocylic compounds may generally be fixed to the surface of the insoluble carriers by utilizing a covalent bond, an ionic bond, physical adsorption, embedding, and settlement on the carrier surface followed by insolubilization.
		As the methylene chain of the spacer, diamine compound in the present invention, in the ligand increases its length, the spacer exhibits increased hydrophobic properties, that is, hydrophobic bonding (1) is enhanced.
	www.stickebana.com /scitech/thermal_insulating_material/immunoglobulin_adsorbent_adsorption.html (4046 words)

	Organic compound
		An organic compound is any of a large class of chemical compound s whose molecule s contain carbon, with exception of carbides, carbonates and carbon oxides.
		Organic compounds are studied in organic chemistry ; many of them, such as protein s, fat s, and carbohydrate s, are also of prime importance in biochemistry.
		The dividing line between organic and inorganic is somewhat controversial and historically arbitrary, but generally speaking, organic compounds have carbon - hydrogen bonds, and inorganic compounds do not.
	www.nebulasearch.com /encyclopedia/article/Organic_compound.html (728 words)

	aromatic compound. The Columbia Encyclopedia, Sixth Edition. 2001-05
		On the other hand, the eight-membered cyclic compound with four alternating double bonds (cyclooctatetraene) is not aromatic and shows reactivity similar to alkenes.
		For this reason, the bonds in the aromatic ring are less reactive than ordinary double bonds; aromatic compounds tend to undergo ionic substitution (e.g., replacement of a hydrogen bonded to the ring with some other group) rather than addition (which would involve breaking one of the resonant bonds in the ring).
		Presence of the six-membered benzene ring is not essential for aromatic compounds; for example, furan, a heterocyclic compound that has a five-membered ring that includes an oxygen atom, has aromatic properties, as does pyridine, a heterocyclic compound whose six-membered ring includes a nitrogen atom.
	www.bartleby.com /65/ar/aromatic.html (326 words)

	Heterocyclic amide compounds and medicinal uses thereof - Patent 6080738
		Heterocycle represented by R.sup.1 and R.sup.1, is a 4 to 6-membered ring having a carbon atom and 1 to 4 hetero atom(s) (oxygen atom, sulfur atom and nitrogen atom).
		The compound (III) is condensed with compound (XXIV) by the method described with respect to the condensation with amine A under Scheme I to convert the compound to compound (XXV).
		The compound (III) is condensed with compound (XXVIII) by the method described with respect to the condensation with amine A under Scheme I to convert the compound to compound (XXIX).
	www.freepatentsonline.com /6080738.html (11493 words)

	CHC indexes
		The index mainly covers general classes of heterocyclic compound and specific heterocyclic compounds, but also included are natural products, other organic and organometallic compounds where their synthesis or use involves heterocyclic compounds, types of reaction, named reactions, spectroscopic techniques and topics involving heterocyclic compounds.
		Heterocycles have been included when they occur as a starting material or as a product, but not when they are reported as a non-isolable intermediate or as a solvent.
		Heterocyclic systems can be named by various methods, depending on ring size, the presence or absence of metal atoms, the availability of trivial names, etc.
	www1.elsevier.com /homepage/saa/chc/indexs.htm (576 words)

	MVS Solutions - Enzymes Coated With Ionic Liquid
		The ionic liquid-coated enzyme according to Claim 3, wherein the organic cation of the heterocyclic compound is selected from the group consisting of imidazolium, pyridinium, pyridazinium, pyrimidinium, pyrazinium, pyrazolium, thiazolium, oxazolium, and triazolium, or an cation of a substituted compound thereof.
		The heterocyclic compound is composed of at least one heteroatom selected from the group consisting of N, O, S, or a combination thereof, and the number of heteroatoms is preferably 1 to 4 and more preferably 1 to 2.
		The cation of the heterocyclic compound is a cation of a compound selected from the group consisting of imidazolium, pyridinium, pyridazinium, pyrimidinium, pyrazinium, pyrazolium, thiazolium, oxazolium, triazolium, and a substituted compound thereof.
	www.mvssolutions.com /PBC_03-057871.html (2561 words)

	Optically-active diamide derivatives (Site not responding. Last check: 2007-11-02)
		In the case of a compound wherein R.sup.2 is an alkoycarbonyl group, n is 1 and X is an oxygen atom, a compound having (R) configuration can be derived from an alkyl ester of L-serine, and a compound having (S) configuration from an alkyl ester of D-serine.
		In the case of a compound wherein R.sup.2 is an alkoxycarbonyl group, X is a sulfur atom and n is 2, a compound having (R) or (S) configuration can be prepared from an alkyl ester of L- or D-homocystein, respectively.
		In a low temperature condition, the compound (A) is controlled stereochemically by the action of the condsiderably strong dipole-dipole repulsion between the thiocarbonyl group and the amidecarbonyl group and the repulsion between the Pro-S group and the Pro-R group, and thus is stabilized as a W-shape conformation (cf.
	www.stickebana.com /scitech/workpiece_manipulation_system/optically-active_diamide_derivatives.html (3870 words)

	Six membered heterocyclic oxathio compounds (Site not responding. Last check: 2007-11-02)
		Five or six membered heterocyclic compounds having two sulfur atoms in the ring are disclosed to be useful in altering the flavor or aroma of foodstuffs in U.S. application Ser.
		Admixtures of two or more oxathio heterocyclic compounds offer the advantages of combining the beneficial and organoleptic qualities of each of the compounds into a total impact which may be superior or different from the characteristics of each of the sole ingredients.
		In those instances where the oxathio heterocyclic compounds of our invention are added to the foodstuff, chewing gum or medicinal product as an essential and integral part of a flavoring composition, it is, of course, necessary that the total quantity of flavoring composition employed be sufficient to yield an effective oxathio heterocyclic compound concentration.
	www.sacnewsmonthly.com /invent/quick_connector_service_wires/six_membered_heterocyclic_oxathio_compounds.html (8871 words)

	CHC indexes (Site not responding. Last check: 2007-11-02)
		The index mainly covers general classes of heterocyclic compound and specific heterocyclic compounds, but also included are natural products, other organic and organometallic compounds where their synthesis or use involves heterocyclic compounds, types of reaction, named reactions, spectroscopic techniques and topics involving heterocyclic compounds.
		Heterocycles have been included when they occur as a starting material or as a product, but not when they are reported as a non-isolable intermediate or as a solvent.
		Heterocyclic systems can be named by various methods, depending on ring size, the presence or absence of metal atoms, the availability of trivial names, etc.
	www.elsevier.com /homepage/saa/chc/indexs.htm (576 words)

	Dorlands Medical Dictionary
		clathrate compound, a type of inclusion complex in which molecules of one type are trapped within cavities of another substance, such as within a crystalline lattice structure or large molecule; called also occlusion c and clathrate.
		high energy compounds, compounds containing high energy bonds (q.v.); because they yield high levels of free energy on hydrolysis, the compounds are basic to the energy supply of living organisms.
		unsaturated compound, a compound in which the combining capacities of all the elements are not satisfied; see unsaturated.
	www.mercksource.com /pp/us/cns/cns_hl_dorlands.jspzQzpgzEzzSzppdocszSzuszSzcommonzSzdorlandszSzdorlandzSzdmd_c_50zPzhtm (2758 words)

	Organic compound (Site not responding. Last check: 2007-11-02)
		Thus carbonic acid is inorganic, whereas formic acid, the first fatty acid, is organic, although it could as well be called "carbonous acid" and its anhydride, carbon monoxide, is inorganic.
		compound chemical compound rubber compound coordination compound compound interest compound bows compound interest caculator compound interest tables organic organic fruit organic foods organic gardening organic herb
		Dakkak B. Co.: for EVA and Rubber Compound Producer of EVA compound, TPR and rubber compound.
	www.serebella.com /encyclopedia/article-Organic_compound.html (485 words)

	United States Patent Application: 0020193528
		A molecular compound according to claim 1 or 2 in which the polymer having hydrogen bond sites is one or more polymers selected from the group consisting of polyethers, polyalcohols, polyamines, polyphenols, polyacrylic acids, polyvinyl ethers, polyvinyl ketones, polyvinyl heterocyclic compounds, polycarboxylic acid vinyls, polysaccharides and polyamino acids.
		The molecular compounds of the present invention can be used together with other substances, whether inorganic or organic, as long as they do not damage target functions, and can also be used by adding to resins, coatings, and their materials and material compositions.
		A clathrate compound here refers to a substance of which there are holes of appropriate size inside three-dimensional structures formed by atoms or molecules bound and other atoms or molecules are placed inside the holes by means of non-covalent interactions at a fixed composition ratio.
	appft1.uspto.gov /netacgi/nph-Parser?Sect1=PTO2&Sect2=HITOFF&p=1&u=/netahtml/PTO/search-bool.html&r=1&f=G&l=50&co1=AND&d=PG01&s1=20020193528&OS=20020193528&RS=20020193528 (6506 words)

	Heterocyclic compound - Wikipedia, the free encyclopedia
		Heterocyclic compounds are organic compounds which contain a ring structure containing atoms in addition to carbon, such as sulfur, oxygen or nitrogen, as part of the ring.
		They may be either simple aromatic rings or non-aromatic rings.
		Note that compounds such as cyclopropane, an anaesthetic with explosive properties, and cyclohexane, a solvent, are not heterocyclic, they are merely cycloalkanes.
	en.wikipedia.org /wiki/Heterocyclic (103 words)

	Encyclopedia: Heterocyclic compound
		A compound is an area of land that is surrounded by fences, walls, or barbed wire and is used for a particular purpose, especially an area containing buildings and where the entry and exit of people is controlled.
		Pyrimidine is a heterocyclic aromatic organic compound, which is similar to benzene and pyridine and that contains two nitrogen atoms at positions 1 and 3 of the six-membered ring.
		Cycloalkanes are chemical compounds with a single ring of carbons to which hydrogens are attached according to the formula CnH2n.
	www.nationmaster.com /encyclopedia/Heterocyclic-compound (449 words)

	Nuclear halogenated - PatentStorm (Site not responding. Last check: 2007-11-02)
		A method for increasing the effectiveness of a microbicide is described, wherein a microbicide and an N-alkyl heterocyclic compound are applied to a substrate or aqueous system subject to the growth of microorganisms.
		Described is the use of microbicidal phenolic compounds in combination with glutaraldehyde for the preparation of disinfectants which are suitable for the disinfection of surfaces and instruments, but also of parts of the body (for example hands) in hospitals and doctors' surgeries.
		Described is the use of microbicidal phenolic compounds in combination with glutaraldehyde for the preparation of disinfectants which are suitable for the disinfection of surfaces and instruments, but also of parts of the body, in hospitals and doctors' surgeries.
	www.patentstorm.us /class/514/737-Nuclear_halogenated.html (1230 words)

	Class Schedule for Class 508 SOLID ANTI-FRICTION DEVICES, MATERIALS THEREFOR, LUBRICANT OR SEPARANT COMPOSITIONS FOR ...
		Inorganic compound (except water) (Overbased or carbonated organic acidic compounds are not classified in this subclass or its indents on the basis of inorganic overbasing or carbonating agents; the overbased or carbonated compounds are treated as complexes, and are classified with the particular organic acidic compound)
		The nitrogen is in a heterocyclic ring, which ring either appears in the compound or has been reacted with a boron compound; a heterocyclic ring is one having as ring members only carbon and at least one hetero atom selected from nitrogen and chalcogen (i.e., oxygen, sulfur, selenium, or tellurium)
		Compound of indeterminate structure, prepared by reacting a heterocyclic compound of known structure; a heterocyclic ring is one having as ring members only carbon and at least one hetero atom selected from nitrogen and chalcogen (oxygen, sulfur, selenium, or tellurium)
	www.uspto.gov /go/classification/uspc508/sched508.htm (1565 words)

	Introduction to Heterocyclic Compounds
		Since the heterocyclic atom must form more than one bond in order to be incorporated into a ring structure, halogens do not form heterocyclic compounds although they may be substituents on a heterocyclic ring structure.
		Heterocyclic compounds, like polycyclic ring compounds, are usually known by non-systematic names.
		Heterocyclic chemistry is the chemistry branch dealing exclusively with synthesis, properties and applications of heterocyclics especially vital to drug design.
	www.3rd1000.com /chem301/chem302a.htm (296 words)

	Nitrogen-containing heterocycle derivative and organic electroluminescent element using the same patent invention
		Another object of the present invention is to provide an organic EL device achieving elevation of luminance and of efficiency in light emission in accordance with an employment of the derivative of heterocyclic compound having nitrogen atom for at least one layer composing organic compound layers of the EL device.
		As a result of intensive researches and studies to achieve the above object by the present inventors, a derivative of heterocyclic compound having nitrogen atom was found to be a novel compound with specific structure useful as a material for an organic El device.
		Further, employing the compound as a component of at least one layer (in particular, electron injecting layer) in organic compound layers of an organic EL device was also found enabling to achieve elevation of luminance and of efficiency in light emission.
	www.freshpatents.com /Nitrogen-containing-heterocycle-derivative-and-organic-electroluminescent-element-using-the-same-dt20060706ptan20060147747.php (1205 words)

	Jiangyin Suli Fine Chemical Co., Ltd.
		Ammoxidation is a process for producing carbocyclic nitriles or heterocyclic nitriles by reacting a carbocyclic or heterocyclic compound having organic substituent(s), with ammonia and an oxygen-containing gas.
		The heterocyclic compounds may also contain as side chains, the same inorganic substituent(s) as described with respect to the above carbocyclic compounds.
		Specific examples of the heterocyclic compounds having organic substituent(s) include furfural, 2-methyl thiophene, 3-methyl thiophene, 2-formyl thiophene, 4-methyl thiazole, methyl pyridine, dimethyl pyridine, trimethyl pyridine, methyl quinoline, methyl pyrazine, dimethyl pyrazine, methyl piperazine or the like.
	www.suli.com /bar32.htm (150 words)

	pyridine -- Britannica Concise Encyclopedia - The online encyclopedia you can trust!
		Any of a class of aromatic compounds with a six-member aromatic ring composed of five carbon atoms and one nitrogen atom, making it a heterocyclic compound.
		Heterocyclic compounds are a major class of organic chemical compounds characterized by the fact that the atoms in their molecules are joined into rings containing at least one atom of an element other than carbon (C).
		These compounds are of great importance because many of the biochemical materials essential to life belong to the class.
	www.britannica.com /ebc/article-9376201?tocId=9376201 (634 words)

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