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Topic: Tetrahedral carbonyl addition compound

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	Encyclopedia :: encyclopedia : Addition (Site not responding. Last check: 2007-11-01)
		Addition (or summation) is one of the basic operations of arithmetic.
		Addition can also be defined for mathematical objects other than numbers — for example, matrices or polynomials.
		Another generalization of addition is a linear combination, where each term in the sum has a multiplier from some given set, usually either the set of real numbers or the set of complex numbers.
	www.hallencyclopedia.com /Addition (1267 words)

	Aldehyde - Encyclopedia, History, Geography and Biography
		An aldehyde is either a functional group consisting of a terminal carbonyl group or a compound containing a terminal carbonyl group.
		The aldehyde functional group is a carbon atom bonded to a carbonyl group and a hydrogen atom.
		An α (alpha) carbon is a carbon adjacent to a carbonyl group.
	www.arikah.net /encyclopedia/Aldehyde (785 words)

	Ketone - Biocrawler (Site not responding. Last check: 2007-11-01)
		A carbonyl carbon bonded to two carbon atoms distinguishes ketones from carboxylic acids, aldehydes, esters, amides, and other oxygen-containing compounds.
		tetrahedral carbonyl addition compound + acid catalyst → imine + water
		tetrahedral carbonyl addition compound + acid catalyst → enamine + water
	www.biocrawler.com /encyclopedia/Ketone (660 words)

	YourArt.com >> Encyclopedia >> fr:Imine (Site not responding. Last check: 2007-11-01)
		An imine can be synthesised by nucleophilic addition from a ketone or aldehyde and ammonia or an amine to a hemiaminal -C(OH)(NHR)- followed by elimination of water to the imine.
		The addition of ammonia to an aldehyde or ketone does not lead to a stable imine.
		A tosylimine reacts with an Î±,Î²-unsaturated carbonyl compound to an allylic amine in the Aza-Baylis-Hillman reaction
	www.yourart.com /research/encyclopedia.cgi?subject=/fr:Imine (328 words)

	Aldehyde - Wikipedia, the free encyclopedia
		Together with protonation of the oxygen atom in the carbonyl group (which can take place either before or after addition), this yields a product where the carbon atom in the carbonyl group is bonded to the nucleophile, a hydrogen atom, and a hydroxyl group.
		In the acetalisation reaction, under acidic or basic conditions, an alcohol adds to the carbonyl group and a proton is transferred to form a hemiacetal.
		In alkylimino-de-oxo-bisubstitution, a primary or secondary amine adds to the carbonyl group and a proton is transferred from the nitrogen to the oxygen atom to create a carbinolamine.
	en.wikipedia.org /wiki/Aldehyde (1226 words)

	[No title]
		The position of the equilibrium between the carbonyl compound and the gem diol depends on the type of carbonyl compound that is reacting.
		The mechanism for hydride addition is shown in Figure X. The second example of irreversible addition to a carbonyl carbon is the grignard reaction.
		If only one type of carbonyl compound is present, then half of the material will be used to generate the enolate anion and the other half will be used as the carbonyl carbon that is attacked by the nucleophile (the enolate anion).
	www.chem.wisc.edu /~newtrad/CurrRef/AIDStopic/AIDS.AldKetRxns.html (2217 words)

	[No title]
		After the nucleophile bonds to the carbonyl C atom, the C atom rehybridizes from sp2 to sp3, and the two electrons from the C=O double bond move up to the O atom, which results in an alkoxide ion.
		The acid catalyzed reaction takes place rapidly because the carbonyl compound is protonated, which converts it into a much better electrophilic acceptor of the water nucleophile.
		By protonating the carbonyl group, a positive charge is place on the O atom, which makes the entire carbonyl group more electrophilic.
	academics.triton.edu /faculty/lpytlewski/CHM132Chp9/CHM132Chp9.ppt (1083 words)

	Ketone - Encyclopedia, History, Geography and Biography
		A ketone is either the functional group characterized by a carbonyl group linked to two other carbon atoms or a chemical compound that contains this functional group.
		The carbon atom adjacent to a carbonyl group is called the α-carbon.
		A diketone is a compound containing two ketone groups.
	www.arikah.net /encyclopedia/Ketone (790 words)

	ketone Information Center - methyl ethyl ketone
		A ketone is either the functional group ketone fingerprint characterized by a carbonyl group linked to two other carbon atoms or serum ketone levels a compound that contains ketone bodies lcad example of a ketone this functional group.
		The carbonyl group when found at the middle is called a ketone and an aldehyde when the carbonyl group is found at the end.
		For common ketones some traditional names such as acetone ketone fuel cell and benzophenone predominate, and these raspberry ketone are considered retained IUPAC names, although some introductory fluid retention ketones chemistry texts ketones urine pregnancy use names such as 2-propanone or propanone.
	www.scipeeps.com /Sci-Chemistry_Topics_J_-_Le/ketone.html (777 words)

	OCOL Mechanisms & Animations (Site not responding. Last check: 2007-11-01)
		The carbonyl carbon is electrophilic and reacts with nucleophiles to form "tetrahedral addition intermediates".
		In this example, a generic nucleophile attacks the carbonyl carbon of an acyl compound (a carboxylic acid derivative; an acid halide, an acid anhydride, a carboxylate ester, a protonated carboxylic acid, or an amide) to form an anionic addition intermediate.
		Collapse of this intermediate reforms the carbonyl carbon with the concurrent loss of one of the attached groups.
	www.chem.uic.edu /web1/OCOL3/MECH/21_01.HTM (91 words)

	esm_bruice_organic_4\|Carbonyl Compounds II: Nucleophilic Addi\|Introduction
		Because Class II carbonyl compounds (aldehydes and ketones) do not have a group that can be replaced by another group, they undergo a nucleophilic addition reaction with one equivalent of the nucleophile.
		In contrast, Class I carbonyl compounds undergo a nucleophilic acyl substitution reaction, reacting with two equivalents of the nucleophile.
		The first equivalent replaces the leaving group, forming a Class II carbonyl compound, which then undergoes the normal addition reaction of a Class II carbonyl compound with the second equivalent of the nucleophile.
	wps.prenhall.com /esm_bruice_organic_4/0,7842,743228-,00.html (292 words)

	First Year Organic Chemistry
		The nucleophilic addition reaction involves the addition of a nucleophile to the electrophilic carbon of the carbonyl group.
		The nucleophile employs its electron pair to attack the carbonyl carbon and thus the two electrons that form the carbon-oxygen double bond move onto the electronegative oxygen atom – in this manner a stabilised oxyanion ion is formed.
		The tetrahedral intermediate is just an intermediate which reacts further by expulsion of the leaving group and formation of a new carbonyl compound is formed.
	users.ox.ac.uk /~mwalter/web_05/year1/year1_notes/carbonyl_chemistry/carbonyl_reactions.shtml (627 words)

	Diketone - Wikipedia, the free encyclopedia
		A diketone is a molecule containing two carbonyl groups.
		Also, if a diketone has ketone carbonyls separated only by one carbon, the alcohol hydrogen in the corresponding enol is hydrogen-bonded to the carbonyl oxygen, giving a six-membered ring (-RC=CH-OH..O=CR-).
		EU Commission has declared that diketones (for example acetylacetone, CH) are like dialcohols and hydroxyketones in that they are in vitro and in vivo genotoxic chemical substances and therefore have been forbidden as nutrition additives since 2005.
	en.wikipedia.org /wiki/Diketone (254 words)

	Encyclopædia Britannica
		The compound with the common name ferrocene (Figure 23) has the systematic name bis(5-cyclopentadienyl)iron, where the number of cyclopentadienyl ligands (two) is indicated by the prefix bis and the number of sites of attachment (five) for each of these is indicated by 5.
		All organometallic compounds are potential reducing agents, and those of the electropositive elements are very strong reducing agents because the metal gives up electrons to the carbon, resulting in a polar M-C bond with a partial positive charge on the metal and a negative charge on the carbon.
		The carbonyl ligands in the tetracarbonylnickel molecule project toward the vertices of a tetrahedron (see Figure 24), and thus the structure is referred to as tetrahedral.
	dwb.unl.edu /Teacher/NSF/C06/C06Links/www.britannica.com/bcom/eb/article/printable/7/0,5722,120227,00.html (5685 words)

	Organic reaction - Wikipedia, the free encyclopedia
		The basic organic chemistry reaction types are addition reactions, elimination reactions, substitution reactions, pericyclic reactions, rearrangement reactions and redox reactions.
		Factors specific to organic reactions are the those that determine the stability of reactants and products such as conjugation, hyperconjugation and aromaticity and the presence and stability of reactive intermediates such as free radicals, carbocations and carbanions.
		Organic reactions can be categorized based on the type of functional group involved in the reaction as a reactant and the functional group that is formed as a result of this reaction.
	domainhelp.search.com /reference/Organic_reaction (730 words)

	Chemical Reactivity
		These relatively stable compounds may then be used to generate isomerically pure enolate anions, or in some cases as enolic nucleophiles in their own right.
		An increase in the acidity of carbon acids activated by two carbonyl groups is well known, and is illustrated by the two beta-dicarbonyl compounds on the left side of the diagram.
		Conjugate addition of amines to unsaturated carbonyl reactants is usually rapid and reversible, as demonstrated by the first equation.
	www.cem.msu.edu /~reusch/VirtualText/special3.htm (9077 words)

	Category:Organic compounds - Wikipedia, the free encyclopedia
		The main article for this category is Organic compound.
		An organic compound is any of a large class of chemical compounds whose molecules contain carbon, with exception of carbides, carbonates and carbon oxides.
		Organic compounds are studied in organic chemistry; many of them, such as proteins, fats, and carbohydrates (sugars), are also of prime importance in biochemistry.
	en.wikipedia.org /wiki/Category:Organic_compounds (112 words)

	An imine is the functional group or compound containing... (Site not responding. Last check: 2007-11-01)
		=Synthesis (by nucleophilic addition)= #ketone or aldehyde + ammonia or primary amine ↔ tetrahedral carbonyl addition compound #
		tetrahedral carbonyl addition compound + acid (catalyst) ↔ imine + water =Nucleophilic addition= #imine + ammonia or primary amine ↔ tetrahedral imine addition compound #
		tetrahedral imine addition compound + acid (catalyst) ↔ new imine =Hydrolysis=
	www.geodatabase.de /imine (146 words)

	Chemistry 210 Experiment 7
		In addition to carbohydrate chemistry, Fischer did extensive work on the chemistry of purine and compounds having purine as their nucleus.
		The mechanism for this reaction involves the nucleophilic addition of the alcohol to the carbonyl group of the protonated acid, followed by elimination of a proton.
		The tetrahedral intermediate is unstable under the acidic conditions of the reaction and undergoes dehydration to form the ester.
	www.miracosta.cc.ca.us /home/dlr/210exp7.htm (1476 words)

	Curly Arrows: Reactions of Carbonyl Compounds
		The carbonyl group and the atoms attached to it lie in the same plane and the bond angles are around 120
		As a consequence of this, a large number of reactions are based on the addition of a nucleophile to the carbon of the carbonyl group.
		The fate of this tetrahedral intermediate depends largely on the nature of the groups R and R'.
	www.abdn.ac.uk /curly-arrows/org/c1.htm (422 words)

	Aldehyde - Biocrawler (Site not responding. Last check: 2007-11-01)
		The other molecules containing a carbonyl group are:
		Aldehydes are named by IUPAC nomenclature by changing the suffix -e of the parent alkane to -al.
		Treating aldehydes with hydrazine will reduce a C=O bond to CH via the Wolff-Kishner reaction.
	www.biocrawler.com /encyclopedia/Aldehyde (626 words)

	Amides: RCONH2
		This low reactivity arises from the interaction of the carbonyl carbon centre with the adjacent nitrogen atom (this in turn in essentially non-basic for the same reason).
		The first stage involves nucleophilic addition to the carbonyl centre (common with ester reduction) and the tetrahedral intermediate then decomposes in a different fashion to that observed for esters.
		Whereas in the case of ester reduction, decomposition of the tetrahedral intermediate occurs with cleavage of the backbone, in the case of the amide adduct, decomposition occurs with carbon-oxygen cleavage and the original C–N backbone is retained.
	users.ox.ac.uk /~mwalter/web_05/year1/year1_notes/carbonyl_chemistry/amides.shtml (380 words)

	ORGS_ANS
		If it is tetrahedral, there are no isomers (i.e., there's only one compound with this formula).
		Addition of HCl to any of these compounds converts the double bond into a single bond, and results in two possible products: 3,3-dichloropentane and 2,3-dichloropentane.
		(b) an aldehyde always has the carbonyl group at the end of a chain and the carbon of the carbonyl group is bonded to a hydrogen; in a ketone, the carbonyl group is in the middle of the chain or ring, and the carbonyl carbon is bonded only to carbons.
	www2.yk.psu.edu /~jhb3/orgs_ans.htm (399 words)

	Ketone - Wikipedia, the free encyclopedia
		In general, ketones are named using IUPAC nomenclature by changing the suffix -e of the parent alkane to -one.
		The relative acidity of the α-hydrogen is important in the enolization reactions of ketones and other carbonyl compounds.
		Aromatic ketones can be prepared in the Friedel-Crafts reaction and the Fries rearrangement.
	en.wikipedia.org /wiki/Ketone (959 words)

	HEMIACETAL
		Alcohol acts as a nucleophile and adds to the carbonyl carbon of the aldehyde (ketone) generating a tetrahedral intermediate.
		In fact, open chain hemiacetals and hemiketals are unstable and any attempts to isolate the will result in the decomposition of these compounds to give back the original carbonyl compound and the alcohol.
		Cyclic hemiacetals which are formed through an intramolecular addition of an OH group to a carbonyl group (on the same molecule) are stable and isolable provided the cyclic structure is either a five membered or a six membered ring.
	www.wiu.edu /users/mftkv/CHEM330(00)/HEMIACETAL.html (468 words)

	Organic reaction Information Center - organic chemistry mechanism reaction problems with answers
		For example, some substitution reactions follow an addition elimination pathway.
		Addition reactions include such reactions organic chemistry reaction roadmap as halogenation, hydrohalogenation and hydration.
		electrophilic addition or EA nucleophilic addition or NA radical addition or RA Elimination reactions
	www.scipeeps.com /Sci-Biochemistry_Topics_N_-_O/Organic_reaction.html (534 words)

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