Optical isomer - Factbites

Optical isomer - Factbites
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Topic: Optical isomer

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	CHEM2P32 Lecture 7: Stereoisomers of Metal Complexes
		The cis-cis-cis geometric isomer of MA is chiral.
		Isomer C: one chloride is trans to a middle nitrogen, the other is trans to a terminal nitrogen.
		The three isomers place A trans to C, A trans to B, and A trans to D. None of these is chiral (the square plane is the plane of symmetry in these complexes).
	chemiris.labs.brocku.ca /~chemweb/courses/chem232/CHEM2P32_Lecture_7.html (887 words)

	isomer - Hutchinson encyclopedia article about isomer
		Geometrical isomers have a plane of symmetry and arise because of the restricted rotation of atoms around a bond&; optical isomers are mirror images of each other.
		Structural isomers have obviously different constructions, but geometrical and optical isomers must be drawn or modelled in order to appreciate the difference in their three-dimensional arrangement.
		CHCl) are structural isomers, but there are two possible geometric isomers of the latter (depending on whether the chlorine atoms are on the same side or on opposite sides of the plane of the carbon–carbon double bond).
	encyclopedia.farlex.com /isomer (209 words)

	Isomerism in Coordination Compounds
		Optical isomers are related as non-superimposable mirror images and differ in the direction with which they rotate plane-polarised light.
		Note that, although it is predicted that tetrahedral complexes with 4 different ligands should be able to give rise to optical isomers (compare C chemistry), in general they are too labile and can not be isolated.
		These isomers are referred to as enantiomers or enantiomorphs of each other and their non-superimposable structures are described as being asymmetric.
	wwwchem.uwimona.edu.jm:1104 /courses/IC10Kiso.html (1242 words)

	US CODE: Title 21,802. Definitions
		(14) The term “isomer” means the optical isomer, except as used in schedule I(c) and schedule II(a)(4).
		As used in schedule I(c), the term “isomer” means any optical, positional, or geometric isomer.
		(A) Opium, opiates, derivatives of opium and opiates, including their isomers, esters, ethers, salts, and salts of isomers, esters, and ethers, whenever the existence of such isomers, esters, ethers, and salts is possible within the specific chemical designation.
	www4.law.cornell.edu /uscode/21/802.html (2225 words)

	Optical isomerism - Wikipedia, the free encyclopedia
		Via a magneto-optic effect, the (-)-form of an optical isomer rotates the plane of polarization of a beam of polarized light that passes through a quantity of the material in solution counterclockwise, the (+)-form clockwise.
		Optical isomerism is a form of isomerism (specifically stereoisomerism) where the two different isomers are the same in every way except being non-superposable
		One example is the amino acid alanine: alanine has two optical isomers, and they are labeled according to which isomer of glyceraldehyde they come from.
	en.wikipedia.org /wiki/Optical_isomerism (1906 words)

	Isomerism
		Thus, the RS isomer is a diastereomer of the RR and SS isomers, and the SS isomer is a diastereomer of the RS and SR isomers.
		Isomers are defined as molecules of identical atomic compositions (molecular formulas), but with different bonding arrangements of atoms or orientation of their atoms in space.
		However, the amount of optical rotation is not constant for an individual enantiomer but rather is dependent on the solvent, concentration, temperature, the wavelength of light used, and the path length of the sample cell employed to determine the rotation.
	www.dekker.com /sdek/92657250-22271917/abstract~db=enc~content=a713491664~words= (3381 words)

	bk7
		In the (E) or “trans” isomer, the “methyl groups”, (CH are on opposite sides of C=C, whereas in the (Z) or “cis” isomer, a different geometry pertains in which the “methyl groups” are on the same side of C=C. The final type of isomerism, “optical isomerism” is the most challenging for students.
		The "non-superimposibility" of 9 upon 10 or vice versa, is the one true test of "optical isomerism".
		As a general rule, "optical isomers" have four different groups attached to C*, such as hydrogen, fluorine, chlorine and bromine.
	www.chem.unl.edu /cak/ch7.htm (3078 words)

	A2 unit chains and rings and spectroscopy nitrogen compounds page
		Optical isomerism occurs as a result of a molecule having a mirror image that is non-superimposable on it.
		When light that has been polarized, so that it travels in only one plane, is shone on an optical isomer and the isomer is rotated, at a particular angle the light is absorbed.
		When synthetic reactions are carried out that make compounds with the possibility of optical isomers, a 50:50 mixture of both isomers will be made.
	www.rjclarkson.demon.co.uk /candrands/nitrogen.htm (1034 words)

	Isomerism in Coordination Compounds
		Optical isomers are related as non-superimposable mirror images and differ in the direction with which they rotate plane-polarised light.
		Note that, although it is predicted that tetrahedral complexes with 4 different ligands should be able to give rise to optical isomers (compare C chemistry), in general they are too labile and can not be isolated.
		These isomers are referred to as enantiomers or enantiomorphs of each other and their non-superimposable structures are described as being asymmetric.
	wwwchem.uwimona.edu.jm:1104 /courses/IC10Kiso.html (1034 words)

	Freelance Traveller - The Lab Ship - Xenobiology 101 - From Primordial Soup to Cells
		Where optical isomerism is possible, in time one form will dominate over another because to catalyse reactions with the other isomer requires more energy.
		One theory suggests that a small excess of one isomer, created by an abundance of circularly polarised light (common in star forming regions), and subsequent amplification by later chemical reactions, did the trick.
		Almost all sugars are D isomers (gut membrane glucose transporters will accept L-glucose with 1% of the avidity of the D form - but most organisms can't do anything with L-glucose).
	www.freelancetraveller.com /features/science/xbio101/xbio2.html (1605 words)

	Optical Isomerism
		It is now known that even when a stereo selective sample of thalidomide (only one of the optical isomers) is created, if administered pH in the body, can cause racemizing.
		The only difference is the positioning of the functional groups, yet it was believed this affected much more than the optical activity of the compound.
		aboratory tests after the thalidomide disaster showed that in some animals the 'S' enantiomer was tetragenic but the 'R' isomer was an effective sedative.
	www.chm.bris.ac.uk /motm/thalidomide/optical2iso.html (190 words)

	NAME:
		tris(acetylacetonato)cobalt(III) and the compound exhibits optical isomerism (Chirality).
		b) the occurrence of optical isomers where the central atom
		a) the occurrence of geometrical isomers where the central
	chem4823.usask.ca /chem231/chem231.fin.html (190 words)

	Isomer
		These types of isomers were found in many cases to affect plane-polarized light by rotating it either to the right or left and hence termed optically active molecules, and it is for this reason that they are called optical isomers.
		Isomers are molecules or molecular compounds that are similar in that they have the same molecular formula, however have different arrangements of the atoms or groups of atoms (functional groups) involved.
		As an example of an structural isomer, both glucose and fructose have the same molecular formula, C
	www.monashscientific.com.au /Isomer.htm (497 words)

	isomer on Encyclopedia.com
		Optical isomers of a given compound are often identical in all physical properties except the direction in which they rotate light.
		Isomers are classified as structural isomers, which have the same number of atoms of each element and molecular weight but different bonding patterns (see chemical bond), or as stereoisomers, which have the same number of atoms of each element, molecular weight, and bonding pattern but in which the atoms have different spatial relationships.
		ISOMER [isomer], in chemistry, one of two or more compounds having the same molecular formula but different structures (arrangements of atoms in the molecule).
	www.encyclopedia.com /html/i1/isomer.asp (1186 words)

	Isomer
		These types of isomers were found in many cases to affect plane-polarized light by rotating it either to the right or left and hence termed optically active molecules, and it is for this reason that they are called optical isomers.
		Isomers are molecules or molecular compounds that are similar in that they have the same molecular formula, however have different arrangements of the atoms or groups of atoms (functional groups) involved.
		As an example of an structural isomer, both glucose and fructose have the same molecular formula, C
	www.monashscientific.com.au /Isomer.htm (1186 words)

	CHEM2P32 Lecture 6: Structural Isomers
		Optical isomers get their names because they are able to rotate a plane-polarized light beam to the left or to the right.
		However, there are instances of chirality and optical isomerism that do not depend on having four different groups attached to a tetrahedral central atom.
		Isomer B does not react with barium chloride but gives a white precipitate of AgCl when a solution of silver nitrate is added to it.
	chemiris.labs.brocku.ca /~chemweb/courses/chem232/CHEM2P32_Lecture_6.html (1045 words)

	Stereoisomers : Stereoisomerism : Optical isomerism. : Biological systems.
		Optical isomerism is immensely important in biological systems.
		For example, when the amino acid alanine is synthesised in the laboratory, a mixture of the two possible isomers (a racemic mixture) is produced (Figure 15).
		Only the isomer of alanine with structure 2 (Figure 16) occurs naturally in organisms such as humans.
	scholar.hw.ac.uk /site/chemistry/topic6.html (203 words)

	Optical Activity
		The observed rotation is dependent upon the path length of the light passing through the sample compartment and is also dependent upon the number of molecules of the isomer.
		Suppose that the observed rotation was -45.5 degrees of rotation.
		As a result, the rotation of the plane polarized light by one configuration is not canceled out or negated by rotation of the light by the opposite configured molecule because it is not present.
	members.aol.com /logan20/optical.html (893 words)

	Organic Isomers
		Optical isomers have the same chemical and physical properties, except that one structure rotates the plane of polarized light to the right and the other rotates it to the left.
		There are three types of structural isomerism that you need to be aware of: chain isomerism, positional isomerism and functional isomerism.
		Functional isomerism, another kind of structural isomerism, occurs when substances have the same molecular formula but different functional groups.
	www.silcom.com /~adbrown/chem102/organic_isomers.htm (893 words)

	Isomerism in Coordination Compounds
		Optical isomers are related as non-superimposable mirror images and differ in the direction with which they rotate plane-polarised light.
		Optical isomers are possible for each of these 15 forms, making a total of 30 isomers.
		Note that, although it is predicted that tetrahedral complexes with 4 different ligands should be able to give rise to optical isomers (compare C chemistry), in general they are too labile and can not be isolated.
	wwwchem.uwimona.edu.jm:1104 /courses/IC10Kiso.html (1242 words)

	CHEM2P32 Lecture 6: Structural Isomers
		Optical isomers get their names because they are able to rotate a plane-polarized light beam to the left or to the right.
		Linkage isomers can exist when one or more ambidentate ligands is bonded to a metal ion.
		Isomer B does not react with barium chloride but gives a white precipitate of AgCl when a solution of silver nitrate is added to it.
	chemiris.labs.brocku.ca /~chemweb/courses/chem232/CHEM2P32_Lecture_6.html (1242 words)

	Stereochemistry (Cis-trans isomerism)
		two classes–geometrical isomerism and optical such isomers is illustrated by Experiment 12-A. isomerism.
		The interconversion of the cis-trans isomers is water in a small round-bottomed flask.
		When an aqueous solution of either isomer is a sealed capillary tube.
	www.hartnell.cc.ca.us /faculty/shovde/chem12a/reportsheets/isomerism.htm (551 words)

	Isomerism - Stereoisomerism in Organic Chemistry GCE-AS-A2-K12 Stereoisomerizm Geometrical and Optical at Doc Brown's Chemistry Clinic. revision,revise,revising,teach,teaching,learn,learning btisomerism2bwpb wpbchemhelp
		Isomerism - Stereoisomerism in Organic Chemistry GCE-AS-A2-K12 Stereoisomerizm Geometrical and Optical at Doc Brown's Chemistry Clinic.
		only one optical isomers might be able to 'dock' successfully or only one optical isomer is formed.
		The diagram of the 'key and lock' mechanism is obviously presented in 2D, but in reality, it is a 3D situation and e.g.
	www.wpbschoolhouse.btinternet.co.uk /page07/isomerism2b.htm (6029 words)

	ch411learnobj7
		You should be able to define and give example of the following concepts: structural isomer, stereoisomer, coordination sphere isomer, linkage isomer, geometric isomer, optical isomer, cis and trans isomers, fac and mer isomers.
		You should be able to draw all types of isomers for a given coordination complex, including those with chelate rings.
		You should be able to describe the basic principles of crystal field theory and ligand field theory.
	wey238ab.ch.iup.edu /woolcock/CH411/ch411learnobj7.htm (6029 words)

	Chapter 7: Optical Activity
		Which isomer is dominant and what is the optical purity of a mixture, of (R)- and (S)-bromobutane, whose specific rotation was found to be -9.2
		Determine the optical purity of a racemic mixture.
		The 60% leftover, which is optically inactive, must be equal amounts of both (R)- and (S)-bromobutane.
	www.chem.ucalgary.ca /courses/351/Carey5th/Ch07/ch7-4-1.html (155 words)

	ch7quest
		Write a structual isomer of propanoic acid that:
		Write formulas and give the name for structural isomers of:
		Give the geometry and hybridization at the central atom for each of the following:
	wulfenite.fandm.edu /ch7quest.htm (73 words)

	hw701ans
		Which, if any, would have an optical isomer?
		Draw and name all the geometric isomers for the following complexes.
		Which, if any, other type of isomer might be expected for this ion?
	condor.depaul.edu /~smelford/Chem115/hw701ans.htm (73 words)

	Mok Rahman
		Synthesis, separation and rearrangements of geometrical, linkage- and optical-isomer especially contating bulky ligands.
		Optically active transition metal complexes; synthetic organometallic and coordination complexes of catalytic importance; asymmetric synthesis and catalysis using chiral metal complexes; enantioselective and diastereoselective reaction of metal complexes; model enzyme systems and development of nonenzymic catalytic systems.
		Chiral metal centre as a probe for stereochemical studies.
	www.unsw.adfa.edu.au /pems/chemistry/staff/amr/amr.html (73 words)

	Board of Pharmacy_855_080
		However the term "isomer" means the optical, position or geometric isomer in 855-080-0021(3) and the term "isomer" means optical or geometric isomer when used in 855-080-0022(1)(d).
		(a) Amphetamine, its salts, optical isomers, and salts of its optical isomers.
		Any quantity of the following substances, including its salts, isomers (whether optical, position, or geometric), and salts of such isomers, whenever the existence of such salts, isomers, and salts of isomers is possible:
	arcweb.sos.state.or.us /rules/OARS_800/OAR_855/855_080.html (3377 words)

	ARS Publication request: Effects of Optically Active Gossypol on Conidia Germination and Growth of Aspergillus Flavus
		One optical isomer was about three times more active than a mixture of the two isomers (1:1 ratio); the other optical isomer was less active than the 1:1 mixture.
		The biological activity exhibited by racemic gossypol with A. flavus appeared to be the sum of activities of the individual optical isomers.
		An investigation was undertaken to determine the effects of gossypol on fungal growth; a bioassay was designed to test the effects of two different chemical forms (optical isomers) of gossypol on fungal growth.
	ars.usda.gov /research/publications/publications.htm?SEQ_NO_115=143877 (526 words)

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