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Bromide reaction with

Step 2 IS the conversion of the bromonium ion to 1 2 dibromoethane by reaction with bromide ion (Br )... [Pg.258]

Brv does not have the power to oxidize bromide ion beyond the elementary stage. The reaction with bromide ion is ... [Pg.178]

The addition of bromine to (R) -4-chlorocyclohex- 1-ene yields initially two diastereomeric cyclic bromonium ions, which then undergo a ring opening reaction with bromide ion. The attack of bromide ion is an Sn2 process and the reaction is stereospecific with inversion. Consequently, the bromo substituents in both diastereomeric products will have a trans relationship. [Pg.117]

EXAMPLE The ionic addition of HBr to propene shows protonation of the less substituted carbon to give the more substituted carbocation. Reaction with bromide ion completes the addition. [Pg.332]

Reaction of 3-hydroxy-oxonene 103 with the complex of bromine and l,2-bis(diphenylphosphino)ethane resulted in an expected mixture of brominated compounds 105 and 106, along with single stereoisomer of oxocene 107, probably due to the formation of the bridged oxonium cation and its two different directions of the reaction with bromide anion (Scheme 17, Section 14.10.5.5.3) <1995TL8263>. [Pg.580]

Oxidation of iodide is very fast and has not been studied. The reaction with bromide has more accessible rates. The rate equation was originally given as °... [Pg.317]

Reaction with bromide ion has a rate expression similar to that for the chloride ion reaction, but when studied in the presence of arsenite ° so that the overall reaction is... [Pg.377]

Powerful C-nucleophiles are available from metal-halogen exchange reactions. While halogenated compounds are electrophilic (because of the higher electronegativity of the halogen compared to carbon), metallated compounds act as nucleophiles. Because of steric bulk, BuLi does not react as a nucleophile in an SN-reaction with bromide 41 but affords exclusively the lithiated intermediate 42. [Pg.28]

A general method fen the synthesis of alkyl iodides is the reaction of tosylates or methanesulfonates with sodium iodide in acetone or magnesium iodide in diethyl ether (equation 30). The reaction is not always a clean Sn2 process. Stereoselectively deuterated neopentyl tosylate, for example, gives with Nal in HMPA only low yields (34%) of the racemic iodide (equation 31). This is in contrast to analogous reactions with bromide and chloride (see Sections 1.7.3.2 and 1.7.2.2), where better yields with complete inversion are observed. [Pg.214]

Thus, the mechanism for electrophilic addition of Bt2 to ethylene as presented in Figure 6.12 is characterized by the direct formation of a cyclic bromonium ion as its hrst elementary step. Step 2 is the conversion of the bromonium ion to 1,2-dibro-moethane by reaction with bromide ion (Br ). [Pg.235]

One piece of recent chemistry of [Xe2]+ has been its reaction with bromide and iodide ions in the presence of xenon gas, which yields the excited complexes XeBr and Xel respectively (107). [Pg.69]

This variation, however, suffered from another problem, namely that bromides generally worked poorly and chlorides very poorly, if at all. We then fonnd that the addition of a triarylphosphine greatly helped the reactions with bromides and made this a practical synthetic reaction. Even so, it has taken many years for organic chemists to accept the use of palladium as a general reagent for organic synthesis. [Pg.600]

Reactions with bromides were less successful. [Pg.96]

The reaction of the unsymmetrical alkyne 2-hexyne with HCl poses a regiochemical problem. Two carbocations are possible—99 and 100—and both are secondary vinyl carbocations and are expected to be of essentially equal stability. It is anticipated that both will be formed in roughly equal amounts, and subsequent reaction with bromide ion will give two products 101 (3-chlo-ro-2-hexene) and 102 (2-chloro-2-hexene). Experimentally, the reaction of HCl with 2-hexyne generates 101 and 102 in roughly a 50 50 ratio. However, the reaction of the alkyne unit with HCl will generate carbocations 99 and 100 as a mixture ofE- and Z-isomers in both cases. (Nomenclature for E- and Z-alkenes was described in Chapter 9, Section 9.4.3.)... [Pg.456]

As depicted in Scheme 10.2, the mechanism of the reaction presumably involves protonation of 1-hexene to afford the secondary carbocation 43. Attack of bromide ion on this ion then leads to 2-bromohexane (41). The carbocation may also rearrange by way of a hydride shift (Sec. 10.3) to provide a different secondary carbocation, 44, which would provide 3-bromohexane (45) upon reaction with bromide ion. Alternatively, it may deprotonate to form 2-hexene (46), addition of H-Br to which could afford both 41 and 45. In this experiment, you will determine the regiochem-istry of the addition of H-Br to the unsymmetrical alkene 1-hexene (40) and thereby assess whether this ionic reaction proceeds according to Markovnikov s rule. [Pg.368]

We know from other experimental evidence that the location of the positive charge in the allylic carbocation is more important than the location of the double bond. Therefore, in the hybrid, the greater fraction of positive charge is on the secondary carbon. Reaction with bromide ion occurs more rapidly at this carbon, giving 1,2-addition, simply because it has a greater density of positive charge. The electrostatic potential map shows that the positive charge (blue) is more intense on the secondary carbon. [Pg.871]

The [H+] term in bromate reactions referred to above has been confirmed in the reaction with bromide. A similar observation has been made in the reaction with the mercuryfi) dimer species. In this case the mechanism is... [Pg.67]


See other pages where Bromide reaction with is mentioned: [Pg.394]    [Pg.35]    [Pg.168]    [Pg.254]    [Pg.254]    [Pg.67]    [Pg.119]    [Pg.229]    [Pg.416]    [Pg.833]    [Pg.414]    [Pg.414]    [Pg.812]    [Pg.477]    [Pg.959]    [Pg.961]    [Pg.235]    [Pg.943]    [Pg.949]    [Pg.543]    [Pg.79]    [Pg.870]   
See also in sourсe #XX -- [ Pg.48 ]

See also in sourсe #XX -- [ Pg.48 ]

See also in sourсe #XX -- [ Pg.48 ]




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1 Heptanol reaction with hydrogen bromide

1- Hexene reaction with hydrogen bromide

1- butanol reaction with sodium bromide

1.3- Bis imidazolium bromide reaction with palladium acetate

2 Butanol reaction with hydrogen bromide

2- Thienylmagnesium bromide, reaction with

Acetyl bromide, reaction with carbohydrates

Acyl bromides reaction with

Affinity chromatography reaction with cyanogen bromide

Alcohols, reaction with thionyl bromide

Alkyl bromides, reaction with sodium

Alkyl bromides, reaction with sodium cyanide

Alkynes coupling reactions with alkenyl bromides

Alkynes, reaction with vinyl bromides

Allyl bromide coupling reaction with

Allyl bromide reaction with alcohols

Allyl bromide, reaction with dianion

Allylation Allyl bromides, reactions with

Allylmagnesium bromide reaction with acrolein

Aluminium bromide reaction with

Aluminum bromide catalyst reaction with oxygen

Aluminum bromide catalyst reaction with water

Aluminum bromide, reaction with oxygen

Amines reaction with cyanogen bromide

Benzyl Bromide reactions with active methylene compounds

Benzyl bromide, reaction with metals

Bis ether reaction with methylmagnesium bromide

Boron bromide reaction with

Boron bromides reactions with alkenes

Bromate, reaction with bromide

Bromide aluminum reaction with bromine

Bromide benzyl, reaction with alkoxides

Bromide benzyl, reaction with amines

Bromide cuprous, reaction with aryl

Bromide reaction

Bromides acid, reaction with amines

Bromides vinyl, reaction with butyllithium

Butyl bromide Grignard reaction with

Butyl bromide coupling reaction with

Butyl bromide reaction with sodium cyanide

Butylmagnesium bromide, reaction with

Carbonyl bromide chloride reaction with

Carbonyl bromide fluoride reaction with

Cellobiosides, alkyl and aryl poly-0acetyl-«- , reaction with hydrogen bromide heptaacetate

Cesium with ammonium, bromide, reaction

Chlorotrifluoroethylene reaction with hydrogen bromide

Cobalt reaction with benzyl bromide

Crotyl bromide reaction with benzaldehyde

Cyanogen bromide reaction with, phosgene

Cyanogen bromide, reaction with phenols

Cyanogen bromide, reaction with proteins

Cyanogen bromide, reactions with tertiary

Cyanogen bromide, reactions with tertiary amines

Ethyl acetate reaction with pentylmagnesium bromide

Ethyl benzoate reaction with phenylmagnesium bromide

Ethyl reaction with allyl bromide

Ethyl reaction with phenylmagnesium bromide

Ethylene bromide, reaction with

Ethylene bromide, reaction with potassium

Ethylene bromide, reaction with potassium iodide

Ethylmagnesium bromide reaction with acetophenone

Ethylmagnesium bromide reaction with alkynes

Ethylmagnesium bromide, reaction with

Ethylmagnesium bromide, reaction with nitriles

Glucopyranose reaction with hydrogen bromide

Glucopyranosyl bromide reaction with

Glucopyranosyl bromide reaction with alcohols

Heterocyclic coupling reactions with alkenyl bromides

Hexylmagnesium bromide, reaction with

Hydrogen bromide reaction with 7-butyrolactone

Hydrogen bromide reaction with alcohols

Hydrogen bromide reaction with alkenes

Hydrogen bromide reaction with alkyl alcohols

Hydrogen bromide reaction with benzoyl chloride

Hydrogen bromide reaction with dienes

Hydrogen bromide reaction with propene

Hydrogen bromide reaction with y-butyrolactone

Hydrogen bromide reaction with, phosgene

Hydrogen bromide, reaction with aldonolactones

Hydrogen peroxide reaction with bromide ions

Hydroxyl radical reaction with bromide

Isobutene, reaction with hydrogen bromid

Isobutylmagnesium bromide, reaction with

Isoprene reaction with hydrogen bromide

Isoprene, reaction with hydrogen bromid

Isopropylmagnesium bromide, reaction with

Ketones, diisobutyl reaction with 2-pentenylzinc bromide

Lithium bromide reaction with ethers

Lithium bromide reaction with mesylates

Lithium bromide reaction with, phosgene

Lithium diphenylcuprate reaction with alkyl bromide

Lithium, 2-furylcoupling reactions with alkenyl bromides

Magnesium bromide allylstannane reaction with carbonyl compounds

Mercury bromide, reaction with

Mercury bromide, reaction with Grignard reagent

Mesitylmagnesium bromide reactions with

Methyl bromide reaction with triphenylphosphine

Methyl bromide, hydrolysis reaction with pyridine

Methylmagnesium bromide, reaction with

Methylmagnesium bromide, reaction with esters

Methylmagnesium bromide, reaction with thiophosphoryl chloride

Nickel reaction with benzyl bromide

Ozone reaction with bromide

Pentafluorobenzyl bromide esterification reaction with

Phenacyl bromide, reaction with pyridine

Phenacyl bromides, reaction with

Phenylacetylene, reaction with ethyl magnesium bromide

Phenylmagnesium bromide reaction with

Phenylmagnesium bromide reaction with benzophenone

Phenylmagnesium bromide reaction with carbon dioxide

Phenylmagnesium bromide, reaction with nitriles

Phenylselenyl bromide, reaction with

Phosphoramidate, N- diethyl ester reaction with alkyl bromides

Phosphorus Bromide reaction with ketones

Prenyl bromide, reaction with phenols

Propargyl bromide, reaction with

Pyridine, 6-methyl-2,3,4,5-tetrahydroN-oxide reaction with allylmagnesium bromide

Quinolines reaction with ethylmagnesium bromide

Reaction of Aldonolactones with Hydrogen Bromide

Reaction of Alkenylmagnesium Bromide with Benzaldehyde

Reaction of Lithiomethyl Isocyanide with Hexyl Bromide, Oxirane and Cyclohexanone

Reaction of Phenylmagnesium Bromide with Boronic Acid Trimethyl Ester

Reaction of cysteinyl residues with azobenzene-2-sulfenyl bromide

Reaction of phosgene with aluminium(III) bromide

Reaction of pyrazole with phenethyl bromide

Reaction with Benzyl Bromide

Reaction with butyl bromide

Reaction with cyanogen bromide

Reaction with ethyl magnesium bromide

Reactions with hydrogen bromide

Silver fluoborate, reaction with ethyl bromide in ether

Styrene, reaction with hydrogen bromid

Styrene, reaction with hydrogen bromide

Sulfides, allyl reaction with allylic bromides

Tetramethylene bromide reaction with

Thionyl bromide, reaction with

Vinyl bromides reaction with aldehydes

Zinc chloride, reaction with phenylmagnesium bromide

Zinc, arylchlorocoupling reactions with alkenyl bromides

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