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Topic: Anomer

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Anomeric carbon

Haworth projection

Falcate Orangetip

Marla Sokoloff

	Process for anomerizing nucleosides - US Patent 5420266 (Site not responding. Last check: 2007-11-04)
		Anomerization of 1-(2'-deoxy-2',2'-difluoro-Î±-D-ribofuranosyl)-4-aminopyrimidin-2-one (1) to 1-(2'-deoxy-2',2'-difluoro-Î²-D-ribofuranosyl)-4-aminopyrimidin-2-one (2) with Anhydrous Lithium Hydroxide in Methanol
		Anomerization of 1-(2'-deoxy-2',2'-difluoro-Î±-D-ribofuranosyl)-4-aminopyrimidin-2-one (1) to 1-(2'-deoxy-2',2'-difluoro-Î²-D-ribofuranosyl)-4-aminopyrimidin-2-one (2) with Potassium Hydroxide in Ethanol
		Anomerization of 1-(2'-deoxy-2',2'-difluoro-Î±-D-ribofuranosyl)-4-aminopyrimidin-2-one (1) to 1-(2'-deoxy-2',2'-difluoro-Î²-D-ribofuranosyl)-4-aminopyrimidin-2-one (2) with Cesium Hydroxide Monohydrate in Methanol
	www.patentstorm.us /patents/5420266.html (5057 words)

	Anomer - Wikipedia, the free encyclopedia
		It has been suggested that this article or section be merged with Anomeric carbon.
		In sugar chemistry, an anomer is a special type of epimer.
		The term for interconversion between the two anomers is mutarotation.
	en.wikipedia.org /wiki/Anomer (97 words)

	Untitled Document (Site not responding. Last check: 2007-11-04)
		The experimental GB values for both anomers were determined to be 188±3 kcal/mol.
		The experimental values are compared with the ab initio estimates of 178-190 kcal/mol and 177-189 kcal/mol for the respective and anomers.
		Theoretical structures for the lowest-electronic-energy protonated species in the three hydroxymethyl conformations of each anomer are also presented to serve as reference data for postulating various kinetic pathways.
	bama.ua.edu /~ccassady/abs8.html (267 words)

	Low temperature process for preparing alpha-anomer enriched 2-deoxy-2,2-difluoro-D-ribofuranosyl sulfonates - US Patent ... (Site not responding. Last check: 2007-11-04)
		The anomeric ratio of the titled compound, as determined by HPLC analysis, was 3.53:1 alpha to beta.
		The anomeric ratio of the titled compound, as determined by HPLC analysis, was 3.76:1 alpha to beta.
		F NMR analysis of the oil indicated that the anomeric ratio of the titled compound was 1.57:1 alpha to beta.
	www.patentstorm.us /patents/5401861.html (2102 words)

	The Anomeric Equilibrium in d-Xylose: Free Energy and the Role of Solvent Structuring (Site not responding. Last check: 2007-11-04)
		This molecule was selected as a simple model for the anomeric effect in sugars since there are no complications arising from the rotameric distribution of a primary alcohol.
		The validity of the partitioning is confirmed by direct evaluation of the energy difference and its components from long standard MD simulations of each anomer.
		anomer as the result of an increased accessible surface area.
	pubs.acs.org /subscribe/journals/jacsat/118/i03/abs/ja951066a.html (254 words)

	Encyclopedia: Anomer (Site not responding. Last check: 2007-11-04)
		An anomeric carbon is the new stereocenter created in forming the cyclic structure of a monosaccharide.
		A space-filling model of glucose Glucose, a simple monosaccharide sugar, is one of the most important carbohydrates and is used as a source of energy in animals and plants.
		Mutarotation is the change in specific rotation that occurs when an α (alpha) or β (beta) hemiacetal form of carbohydrate is converted into an equilibrium mixture of the two forms.
	www.nationmaster.com /encyclopedia/Anomer (380 words)

	Patent 5453499: Process for preparing alpha-anomer enriched 1-halo-2-deoxy-2,2-difluoro-D-ribofuranosyl derivatives
		Anomeric mixtures are expressed as a weight/weight ratio or as a percent.
		The phrase "anomer enriched" alone or in combination refers to an anomeric mixture wherein the ratio of a specified anomer is greater than 1:1 and includes a substantially pure anomer.
		As for 3,5-hydroxy protected-2-deoxy-2,2-difluoro-D-ribofuranosyl-1-.beta.-alkylsulfonates, they may be prepared by separating a 1:1 anomeric mixture of 3,5-hydroxy protected-2-deoxy-2,2-difluoro-D-ribofuranosyl-1- alkylsulfonates by selective crystallization or column chromatography, as described by Chou, et al.
	www.freepatentsonline.com /5453499.html (2136 words)

	Patent 4250301: Anomer enrichment of alkyl glycosides of amino sugars
		The process for the enrichment of.beta.-anomers in an equilibrium mixture of.alpha.- and.beta.-anomers of alkyl glycosides of amino sugars which comprises subjecting an aliphatic alcoholic solution of the mixture of said anomers containing an inorganic base and 0.1 to 5% water based on the alcohol content of the solution, to a temperature of 20.degree.-60.degree.
		Accordingly, it is desirable to employ anomers of alkyl glycosides of amino sugars having the highest possible.beta.-anomer content.
		It is therefore the primary object of this invention to provide a process for the enrichment of the.beta.-anomers in the complex chiral.alpha.- and.beta.-anomers of alkyl glycosides of amino sugars.
	www.freepatentsonline.com /4250301.html (2560 words)

	World Intellectual Property Organization (Site not responding. Last check: 2007-11-04)
		A mixture of anomers represented by formula A or formula B is obtained as described herein in Scheme 1.
		Because of the enzyme selectivity, the anomeric purity of the hydrolyzed and separated a-anomer is considerably high.
		In another embodiment, the procedure of Scheme 2 is followed except the anomeric mixture represented by formula 2A and 2B is replaced with an anomeric mixture represented by formula 2D and 2E, respectively.
	www.wipo.int /ipdl/IPDL-CIMAGES/view/pct/getbykey5?KEY=01/58894.010816&ELEMENT_SET=DECL (6543 words)

	New Chemistry of Dispiroketals: Ligands for Asymmetric Catalysis
		It was hoped that the substituents would exert control over the geometry of the anomeric centres formed during dispiroketalisation as is true in the case of dihydropyranyl dispiroketals.
		The anomeric sulphone 19 (5.0 g, 22 mmol) in THF (15 ml) was added to a solution of magnesium bromide etherate (11.41 g, 44.2 mmol, 2 eq.) and triethylamine (4.62 ml, 3.35 g, 33.1 mmol, 1.5 eq.) in THF (35 ml) under argon.
		The anomeric sulphone 29 (5 g, 22.1 mmol) in THF (15 ml) was added to a solution of magnesium bromide etherate (11.41 g, 44.2 mmol, 2 eq.) and triethylamine (4.62 ml, 3.35 g, 33.1 mmol, 1.5 eq.) in THF (35 ml) under argon.
	www.ch.ic.ac.uk /ectoc/papers/03 (4861 words)

	Patent 4107425: Preparation of 1-.alpha.- and 1-.beta.-glucose esters by stereoselective acylation of metalated ...
		Anomerically pure 1-.alpha.- and 1-.beta.-esters of 2,3,4,6-Tetra-O-benzyl-D-glucopyranose have been prepared in high yield by controlling the stereochemistry of 1-O-acylation of appropriately protected D-glucose.
		When the esters are oils that cannot be crystallized, the anomeric composition is easily determined by evaluation of the proton nmr spectrum of the characteristic anomeric hydrogens.
		The physical properties of some TBG esters prepared by this process are shown in Table I. The benzyl group is easily removed from the acyl glucopyranose benzyl ester by well established hydrogenolysis, especially when the acyl group is saturated, to produce a quantitative yield of the desired 1-.alpha.- or 1-.beta.-glucosyl ester.
	www.freepatentsonline.com /4107425.html (2162 words)

	Indium trichloride catalyzed Ferrier rearrangement — facile synthesis of 2,3-unsaturated glycosides (Site not responding. Last check: 2007-11-04)
		In contrast to the Lewis acid mediated Ferrier rearrangement, the anomeric stereochemistry of this reaction is controlled by the employed ligand.
		H NMR (400 MHz) spectrum of the mixture, the ratio of the anomers was calculated.
		H NMR spectrum of mixture, the ratio of the anomers was calculated.
	www.arkat-usa.org /ark/journal/2004/I08_Narasimhan/1099/1099.asp (4254 words)

	Molecular Recognition of Carbohydrates (Site not responding. Last check: 2007-11-04)
		In maltose the glucose units are connected with anomeric center (1) in alpha configuration to the second unit at the 4 position.
		The perturbation involves epimerisation at the carbinol center: Starting from the alpha anomer the beta hydroxy group is stepwise growing while the alpha hydroxy group is shrinking.
		During the simulation the free energy difference between the alpha and the beta anomer of glucose bound to the host is calculated (GC).
	www.nmr.chem.uu.nl /~abonvin/ToT/damm (454 words)

	Anomeric Specificity of the Stimulatory Effect of D-Glucose on D-Fructose Phosphorylation by Human Liver Glucokinase -- ... (Site not responding. Last check: 2007-11-04)
		Anomeric Specificity of the Stimulatory Effect of D-Glucose on D-Fructose Phosphorylation by Human Liver Glucokinase -- Jijakli et al.
		at investigating the anomeric specificity of such a positive cooperativity.
		(63.5%) at anomeric equilibrium, and the reaction velocities measured
	www.jbc.org /cgi/content/full/278/7/4531 (2396 words)

	BC Online: 3A - Mono- and Dissacharides
		Figure: A more rigorous view of the relationship between the anomeric OH and the OH on the last chiral C of a sugar.
		On the addition of acid (which protonates the anomeric OH, forming water as a potential leaving group), another alcohol can add forming an acetal (or ketal from a ketone) with water leaving.
		Since Fru is attached through the anomeric OH of this ketose, the Fru is not in equilibrium with its straight chain keto form, and hence sucrose is a nonreducing sugar.
	employees.csbsju.edu /hjakubowski/classes/ch331/cho/monosaccharides.htm (1005 words)

	Interaction of alloxan and anomers of D-glucose on glucose-induced insulin secretion and biosynthesis in vitro -- Niki ... (Site not responding. Last check: 2007-11-04)
		Interaction of alloxan and anomers of D-glucose on glucose-induced insulin secretion and biosynthesis in vitro -- Niki et al.
		using the alpha anomer of D-glucose than the beta anomer.
		anomers in connection with those of other sugars are discussed.
	diabetes.diabetesjournals.org /cgi/content/abstract/25/7/574 (255 words)

	Model of D-Glucopyranose
		These are the two anomers (diastereoisomers differing only at the acetal/hemiacetal site) of glucopyranose, a cyclic form of glucose with a six-membered, pyran-like ring.
		The anomers exist because a new asymmetric center is created when the hemiacetal forms.
		In general, the anomer with the hemiacetal OH group trans to the terminal -CH OH group is the alpha anomer, that with the two groups cis is the beta anomer.
	wps.prenhall.com /wps/media/objects/726/743894/glucopyranose.html (152 words)

	Reactions of monosaccharides
		anomer is less stable, by a factor of about 2.
		The anomers can be distinguished by their ability to rotate the plane of plane-polarized light.
		These are all ethers except for the acetal/ketal at the anomeric carbon.
	www.cornellcollege.edu /chemistry/courses/cardon/organic/326chorxns.html (941 words)

	Monosaccharides and Oligosaccharides Analysis = Prevention of Anomer Separation
		In such cases, these saccharides exist as two tautomers because the carbon atom of the terminal reducing group is asymmetric; these tautomers are called anomers (alpha- and beta-anomers respectively).
		For the analysis of sugars, therefore, it is necessary to prevent the anomer separation.
		Polymer-base columns such as NH2P allow the separation of saccharides without causing the anomer separation as the column can be used under alkaline environment.
	www.hplc.com /Shodex/english/dc030202.htm (213 words)

	Section Two (Site not responding. Last check: 2007-11-04)
		We will only be concerned with structures in which the anomeric carbon is C1 or C2.
		The new hydroxyl (bonded to the anomeric carbon) may point up or down in the Haworth projection.
		If this hydroxyl is on the same side of the ring as C6, the structure is called the -anomer.
	erkki.kennesaw.edu /schem219/sc00011.htm (689 words)

	Steve's place - Carbohydrates
		Carbon 1 is the anomeric carbon, and doesn't exist in the open chain form, so we're left with carbon 5 to understand.
		Glucose is in the α anomeric form (OH on carbon-1 is on the opposite side to the CH OH on carbon-5), and fructose is in the β anomeric form (OH on carbon-2 is on the same side as the CH on carbon-5).
		The formation of a glycosidic bond between these two anomeric OH groups prevents the sucrose molecule from having an open-chain form, hence sucrose is unable to participate in reduction of Benedict's reagent.
	www.steve.gb.com /science/carbohydrates.html (2301 words)

	SWINBURNE UNIVERSITY OF TECHNOLOGY
		Glucose undergoes mutarotation in solution to form a 36:64 mixture of anomers.
		Draw a chair representation on the other anomer.
		An explanation based on the relative energies of the two anomers in their favoured conformation is required.
	freon.chem.swin.edu.au /~marg/stereo/stereo_1.html (186 words)

	Page1 Stereoregular oligomers and polymers from glycals (Site not responding. Last check: 2007-11-04)
		Initiation via Ferrier rearrangement and insertion of a second monomer 1 affords a 50:50 mixture of anomers 2 which can be reduced to a single enantiomer 3 on treatment with a Lewis acid and triethylsilane.
		-xylal 8 affords a single axial anomer which is yet to be fully characterised.
		The racemic 5-deoxyglucal 9 analogue also proceeds at -78 °C to afford one diastereoisomer in 58% yield and several minor products, none of which are isolable.
	www.ch.ic.ac.uk /ectoc/echet96/papers/008/oligomers.html (154 words)

	ARS \| Publication request: B3lyp/6-311++g** Study of Monohydrates of a and B-D-Glucopyranose: Hydrogen Bonding, Stress ...
		The increase in energy that occurs with a similar interaction on the B-anomer is much less effective since the hydrogen bond is much longer.
		Using the calculated free energies of all 26 configurations, the anomer population (a/B) increases in B-anomer population relative to the in vacuo case by -10% at the expense of the a-anomer, giving an (a/B) ratio of -50/50.
		From analysis of donor and acceptor hydrogen bond lengths, excellent correlation is found between the DFT calculated distances and those taken from carbohydrate structures in the Cambridge Crystallographic Data Bank.
	www.ars.usda.gov /research/publications/publications.htm?SEQ_NO_115=151781 (549 words)

	DHEA, antibiotics, Weight Loss drugs, weight loss herbs, weight loss herbal formula, hair loss, hair growth, buy Rx ... (Site not responding. Last check: 2007-11-04)
		Streptozotocin (SZ), a beta cell toxin, is composed of a cytotoxic moiety, 1-methyl 1-nitrosourea, attached to carbon-2 of glucose and exists as either of two anomers in the pyranose form.
		At higher doses, no differences between the alpha and beta anomers were observed.
		Larger doses of glucose protected against the lower doses of SZ and, under such conditions, the individual glucose anomers appeared equally potent.
	twinpharm.com /ref-glucagon/glucagon-research-abs4.127.html (931 words)

	Haworth Projections (Site not responding. Last check: 2007-11-04)
		This tutorial shows the relationship between Fischer and Haworth projections and their relationship with the three-dimensional structure of each anomer.
		Each of the sugars is in its reducing form and shown as both the alpha and beta anomer.
		The 3-D conformation of the sugar may not be in its lowest energy chair conformation.
	www.nku.edu /~russellk/tutorial/sugar/haworth.html (94 words)

	anomer - OneLook Dictionary Search
		Tip: Click on the first link on a line below to go directly to a page where "anomer" is defined.
		anomer : Stedman's Online Medical Dictionary, 27th Edition [ home, info ]
		anomer : Dorland's Illustrated Medical Dictionary [ home, info ]
	onelook.com /?w=anomer (102 words)

	MBAA TQ - Fermentation conditions associated with incomplete glucose and fructose utilization. (Site not responding. Last check: 2007-11-04)
		This appears to be associated with the use of amyloglucosidase to break certain nonfermentable sugars remaining in wort down to their fermentable components, thus reducing the carbohydrate content remaining after fermentation.
		Glucose consists of two anomers, termed alpha and beta pyranose respectively, and while the alpha anomer is preferred by the yeast it is the beta anomer which is mainly formed by amyloglucosidase.
		Since high glucose concentrations inhibit the fermentation of fructose, the latter sugar also tends to remain behind.
	www.mbaa.com /TechQuarterly/Abstracts/1990/tq90ab23.htm (220 words)

	Anomer Encyclopedia Article, History, Biography @ Local Color Art (Site not responding. Last check: 2007-11-04)
		Find the Best Sites For anomer With Starware - Starware search is an excellent resource for quality sites on anomer and much more!
		Find anomer - Your relevant result is a click away!
		Merging this article or section with Anomeric carbon may be desirable. (
	www.karr.net /search/encyclopedia/Anomer (241 words)

	JCE 1999 (76) 799 [Jun] A New Method To Convert the Fischer Projection of a Monosaccharide to the Haworth Projection
		Henan Normal University, Department of Chemistry, Henan 453002, P.R. This method is based upon the R,S-configuration designation of each asymmetric carbon of a monosaccharide.
		-configuration of a sugar in Haworth projection can be directly determined by designating the R,S-configuration of the highest-numbered asymmetric carbon; that is, the most distant carbon from the anomeric carbon.
		By comparing the stereochemistry of the anomeric carbon with that of the highest-numbered asymmetric carbon, the
	jchemed.chem.wisc.edu:8000 /Journal/issues/1999/Jun/abs799.html (189 words)

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