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Tautomer

ChemSketch is a professional software package that is available free of charge from Advanced Chemistry Development Inc. (ACD). Besides the editor, it has several modules (ACD/Dictionary, ACD/Tautomers), extensions, and add-ins concerning the calculation of physicochemical properties, input of spectra and chromatograms, naming of molecules, and a viewer. [Pg.141]

The mass-spectrometric fragmentation of 2-aminothiazole-3-oxides is characterized by the abstraction of O and OH out of the molecule ion. Variations observed in the mass spectra suggest an equilibrium between tautomers 354a and 354b in the gas phase (Scheme 203). [Pg.118]

The keto tautomer (211a) is involved in the high electrophilic reactivin-of the C-5 carbonyl group. Thus ring opening has been reported u ith various amino nucleophilic reagents. [Pg.433]

The 4-hydroxy-THISs are extremely hygroscopic hydrolysis affords the parent thiobenzimide (3). When R" = Me and R = p-ClPh or Ph, but not p-NOjPh the nondipolar tautomer 3 (X = 0, Y = CH2) is present according to NMR and infrared spectra, the latter exhibiting carbonyl absorption at 1710 to 1720 cm ... [Pg.4]

Scheme 30) (6). Infrared spectra of the products possess a normal amide carbonyl absorption, indicating that the products are not present on the dipolar form (30) but rather as the neutral A -thiazoline tautomer (31 or 32) (6). [Pg.15]

Of all the methods described for the synthesis of thiazole compounds, the most efficient involves the condensation of equimolar parts of thiourea (103) and a-haloketones or aldehydes to yield the corresponding 2-aminothiazoles (104a) or their 2-imino-A-4-thiazoline tautomers (104b) with no by-products (Method A, Scheme 46). [Pg.213]

The a-halogenated acids or their esters (105) also react with thiourea to give 2-amino-4-hydroxythiazoles (106a) or their 2-amino-4-thiazolone (106b) (1, 247, 254, 530) or 2-imino-4-oxathia2olidine (106c) tautomers (Scheme 47). [Pg.215]

The symmetrical disubstituted thioureas such as 137 do not give a thiazolic ring (Scheme 66), but give compounds of type 138 or 139, which are derived from the tautomer imino form of the 2-aminothiazole (86). [Pg.248]

The aldehyde or ketone is called the keto form and the keto enol equilibration referred to as keto-enol isomerism or keto-enol tautomerism Tautomers are constitu tional isomers that equilibrate by migration of an atom or group and their equilibration IS called tautomerism The mechanism of keto-enol isomerism involves the sequence of proton transfers shown m Figure 9 6... [Pg.379]

The keto and enol forms are constitutional isomers Using older terminology they are referred to as tautomers of each other... [Pg.759]

Write a structural formula for the enol tautomer of cytosine... [Pg.1158]

Indole is a heteroaromatic compound consisting of a fused benzene and pyrrole ring, specifically ben2o[ ]pyrrole. The systematic name, IJT-indole (1) distinguishes it from the less stable tautomer 3JT-indole [271-26-1] (2). Iff-Indole [120-72-9] is also more stable than the isomeric ben2o[ ] pyrrole, which is called isoindole, (2H, (3) and IH (4)). A third isomer ben2o[i ]pyrrole is a stable compound called indoli2idine [274-40-8] (5). [Pg.83]

The Fischer Indole Synthesis and Related Sigmatropic Syntheses. In the Fischer indole synthesis (26) an Ai-aryUiydra2one is cyclized, usually under acidic conditions, to an indole. The key step is a [3,3] sigmatropic rearrangement of an enehydra2one tautomer of the hydra2one. [Pg.86]

Substitution at decreases the possible number of tautomers for 3-pyrazolones, two tautomeric forms are possible, (39) and (40), which in nonpolar solvents are both present in about the same ratio. 5-Pyrazolones exhibit similar behavior. [Pg.312]

The compounds 2- (16) and 4-pyridone (38) undergo chlorination with phosphoms oxychloride however, 3-pyridinol (39) is not chlotinated similarly. The product from (38) is 4-chloropyridine [626-61-9]. The 2- (16) and 4-oxo (38) isomers behave like the keto form of the keto—enol tautomers, whereas the 3-oxo (39) isomer is largely phenolic-like, and fails to be chlotinated (38). [Pg.328]

A Wittig-type reaction has been used to obtain N-piotected 3-hydioxypyiioles, which exist as the pyiiolenone (13) tautomers (26). [Pg.355]

Nomenclature is based on the keto-enol tautomers. The trihydroxy form is variously designated cyanuric acid, j -triaziae-2,4,6-triol or 2,4,6-trihydroxy-j -triaziQe. The trioxo stmcture, or j -triaziae-2,4,6(lJT,3JT,5JT)-trione is the basis for the isocyanuric acid nomenclature. [Pg.417]

Hydroxya2o dyes vary in the proportion of tautomers present from pure a2o tautomer to mixtures of a2o and hydra2one tautomers, to pure hydra2one tautomer. Almost all a2ophenol dyes (11) exist totally in the a2o form, except for a few special cases (9). [Pg.274]

Aminoa2o dyes undergo protonation at either the terminal nitrogen atom to give the essentially colorless ammonium tautomer (18) 325 nm). [Pg.275]


See other pages where Tautomer is mentioned: [Pg.225]    [Pg.225]    [Pg.614]    [Pg.851]    [Pg.1144]    [Pg.24]    [Pg.148]    [Pg.318]    [Pg.430]    [Pg.2]    [Pg.293]    [Pg.832]    [Pg.475]    [Pg.475]    [Pg.24]    [Pg.295]    [Pg.308]    [Pg.67]    [Pg.68]    [Pg.249]    [Pg.249]    [Pg.249]    [Pg.474]    [Pg.417]    [Pg.274]    [Pg.274]    [Pg.274]    [Pg.276]   
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1,2,3 -Triazole anions, tautomers

1,2,4,5 -Thiatriazine, thermodynamic stabilities of tautomers

1,2,4,6-Thiatriazine 1,1-dioxides, tautomers

1,2-Dimethylguanine, tautomers

1.2- Dithiete tautomers

1.2- Dithiins, tautomers

1.2.3- triazole tautomers

2- Hydroxypyrazine, computational studies of tautomers

2- Hydroxythiophenes, tautomers

2- Methoxypyridine tautomers

2- Oxopyridine tautomers

2- Oxopyridine tautomers relative electronic energies

2- benzothiazole tautomers

2- hydroxy-, tautomers

2-Aminoimidazoles, amino tautomer

2-Hydroxy-4-pyridinone tautomers

2-Hydroxyoxazole, tautomers

2-Hydroxyquinolines, tautomers

2-Pyridone tautomers

2-mercapto-, tautomers

2.3- Dihydroxypyrazine, computational studies of tautomers

2.5- Dialkyl-3,4-dihydroxyfurans, tautomers

3 -Methyl-4-nitropyrazole, tautomers

3 pyrazole annular tautomers

3- Hydroxybenzo thiophene, tautomers

3- Hydroxypyrazole, tautomerism tautomers

3- Methylcytosine tautomers

3-Amino-l,2,4-triazole, relative stabilities tautomers

3-Hydroxythiophene-2-carboxylates, tautomers

3//-Indole, tautomer

3//-Indole, tautomer formation

4- Hydroxypyrazole, hydroxy tautomer

4-Aminopyrimidine, tautomers

5-Fluorouracil tautomers

6-Methoxy tautomer

7-Azaindol tautomers

8- Oxoguanine, tautomers CUMULATIVE , VOLUMES

A-tautomer

Acetone tautomers

Aci nitro tautomer

Aci tautomer

Acid strength tautomers

Acid-base equilibrium tautomers

Adenine Tautomer energy

Adenine, tautomers

Allopurinol, tautomers

Amide tautomer

Amide/imidate tautomers

Amides tautomers

Ascorbate tautomers

Azoles, tautomers, stabilization

CH tautomers

Carbohydrates tautomers

Carbonyl compounds tautomers

Carbonyl groups tautomers

Carbonyl tautomers

Carbonyl-enol tautomerizations tautomers

Conformation and tautomers, vibrational spectra used

Constitutional isomers tautomers

Croconate valence tautomers

Cyclic Tautomers of Tryptamine and Tryptophan

Cyclohexanone tautomer

Cyclopentanone tautomers

Cytosine Tautomer energy

Cytosine amino tautomer

Cytosine, tautomers

Deprotonation 2- hydroxy-, tautomers

Dicarbonyl compounds tautomers

Diimine tautomer

Double bond tautomers in nonconjugated systems

Enamine tautomer, protonated

Enamines tautomers

Enol tautomer

Enol tautomers

Enol tautomers Enolate anions

Enolate tautomers

Enolic tautomer

Enolimine tautomer

Equilibrium tautomers

Existence of Individual Tautomers

Formamide tautomers

Formamidic acid tautomers

From carboxylic acids tautomers

Furan 2- hydroxy-, tautomers

Furan 2-mercapto-, tautomers

Guanine Tautomer energy

Guanine, tautomers

H Tautomer

Heterocyclic Tautomers

Histidine tautomer

Hydroxypyridine-pyridone tautomers

Hypoxanthine, tautomers

Imidazole tautomers

Imidic acid tautomer

Imine tautomer

Imine-enamine tautomer

Imine-enamine tautomers

Imino tautomer

Individual tautomers

Intermediate tautomer stabilization

Ionization and Tautomer Model

Isoindole tautomers

Isomers tautomers

Its Hydridomethyl Tautomer

Kekule tautomer

Ketenes tautomers

Keto and Enol Tautomers

Keto tautomer

Keto tautomer acyclic

Keto tautomer proportion

Keto tautomers

Keto-enol tautomer

Keto-phenol tautomers

Ketone tautomers

Lactim-lactam tautomers

Lactim-lactam tautomers relative electronic energies

Metastable tautomers

Methylimidazole tautomers

Methylimidazole tautomers compounds

Methylpyrazole tautomers

N-hydroxy-, tautomers

Naphthalene tautomer

Nitro tautomer

Nitrones tautomers

Nucleic base tautomer

Nucleobase tautomer

Nucleobases Tautomer-selective spectroscopy

Of purine tautomers

P-tautomer

Proton tautomer

Proton using tautomers

Prototropic tautomers

Prototropic tautomers of purine

Purine tautomer

Purine tautomer imino

Quinol tautomer

Solvent effects keto-enol tautomer equilibria

Solvent effects tautomer equilibrium

Stability, tautomers

Stable tautomer

Structure of Thiouracils and Their Lower-Energy Tautomers

Structures of the Tautomers

TAUTOMER (Molecular

Tautomer Ratio in the Imine-Enamine System Substitution at Nitrogen

Tautomer Ratios Requiring Computation 2-Oxo Derivatives of Pyrrole, Furan, and Thiazole

Tautomer SMILES

Tautomer acid-base equilibrium

Tautomer algorithm

Tautomer conversion

Tautomer distinguishing from resonance

Tautomer enumeration

Tautomer equilibrium

Tautomer example

Tautomer intermediates

Tautomer ketones

Tautomer search

Tautomer structures

Tautomer table

Tautomer trigger

Tautomer, definition

Tautomer-Selective Spectroscopy of Nucleobases, Isolated in the Gas Phase

Tautomer-selective spectroscopy

Tautomers

Tautomers

Tautomers 1,2-enolization

Tautomers A Slight Digression

Tautomers Cumulative

Tautomers INDEX

Tautomers Structural isomers that differ

Tautomers aldehydes

Tautomers and Aromaticity

Tautomers and Equilibrium

Tautomers compounds

Tautomers conformational studies

Tautomers derivatives

Tautomers description

Tautomers disaccharides

Tautomers double proton transfer

Tautomers feature

Tautomers form proportions

Tautomers keto-enol

Tautomers keto-enol tautomerism

Tautomers of nucleotide bases

Tautomers pattern

Tautomers preferential stabilization

Tautomers rates

Tautomers ring conformations

Tautomers solvent effects

Tautomers structure

Tautomers tautomeric equilibria

Tautomers tautomerization scheme

Tautomers temperature dependence

Tautomers water interaction with

Tautomers, basic properties

Tautomers, cytosine proton transfer

Tautomers, cytosine stabilities

Tautomers, defined

Tautomers, equilibrium constants

Tautomers, interaction

Tautomers, vibrational spectra

Tautomers, vibrational spectra used to analyze

Tetrazole tautomers, reactions

The Basicity Method for Estimating Tautomer Ratio A Radical Re-appraisal

Theoretical calculations tautomers

Thiouracils and Their Tautomers with Water

Thymine Tautomer energy

Thymine tautomers

Uracil Tautomer energy

Uracil tautomers

Valence tautomer

Valence tautomers

Valence tautomers, and

Warfarin tautomers

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