2- hydroxy-acetophenones

A good correlation was obtained in 20-80% acetonitrile-water mixtures. The standard non-ionic compounds used to evaluate the columns were 2-hydroxy-acetophenone, coumarin, acetophenone, indole, propiophenone, butyro-phenone, isopropyl benzoate, butyl benzoate, and isopentyl benzoate. The plotted lines for the linear relationship measured in five different proportions... [Pg.111]

Fig. 6.46. El mass spectra of 2-hydroxy-acetophenone (a) and 2-methyl-benzoic acid (b). Spectra used by permission of NIST. NIST 2002.

C8H7CI2NO2 3 5 -Dichloro-2 -hydroxy-acetophenone oxime Complexing agent Extraction-photomehic Gravimetric Photomehic Be, Cd, Co, Mn, Ni, U, V, Zn Co, V Pd Mn, U 3... [Pg.530]

The rearrangement of aryl and naphthyl acetates has been reported to be catalyzed by Bi(0Tf)3xH20 (Scheme 9) [68, 69]. As previously reported, only ortho-Fries products (l-hydroxy-2-acylaromatics) were produced from substrates for which ortho acylation was possible. In the case of 2,6-dimethoxyphenyl acetate, only the 3,5-dimethoxy-2-hydroxy acetophenone was produced, indicating that in this case the mechanism involves an intermolecular acyl-group transfer. As in other reactions, the nature of the true catalyst is still unclear since triflic acid also catalyzes this reaction. [Pg.149]

Deacetylation of 4-[(o-acetoxy)benzylidene]-2-phenyl-5(47/)-oxazolone also immediately affords 602. The starting oxazolone was obtained by cyclodehydration of the corresponding cinnamic acid precursor or by condensation of hippuric acid with 2-acetoxybenzaldehyde in the absence of base. In examples using 2-hydroxy-acetophenone, 4-methyl-3-(acylamino)coumarins are obtained. ... [Pg.256]

HYDROXYPHENYL)-(9CI) 2 -HYDROXY-ACETOPHENONE o-HYDROXYPHENYL METHYL KETONE USAF KE-20... [Pg.749]

Condensation of tren with 2,3-dihydroxybenzaldehyde, sal (52) (or derivatives), acac, 2-hydroxy-acetophenone (or derivatives), pyridine carboxaldehydes, pyrrole carboxaldehydes and... [Pg.433]

The Cs+-exchanged zeolites, which are the most basic, have been shown to catalyse the Claisen Schmidt condensation between substituted 2-hydroxy-acetophenones and substituted benzaldehyde to give the 2 -hydroxychalcone structure (Reaction 3).30... [Pg.26]

The use of mesitoic acid esters has again been successfully employed by Burrows and Topping (1975) in the elucidation of intramolecular carbon acid participation. Under basic aqueous conditions, 2-acetylphenyl mesitoate [41] hydrolyses to yield mesitoic acid and 2-hydroxy acetophenone, reacting with intramolecular catalysis via the monoanion of the ketonic hydrate (see p. 192). However, in 47.5% aqueous ethanol containing potassium hydroxide, the reaction products from l-acetyl-2-naphthyl mesitoate [45] were found... [Pg.197]

Beilsteln Handbook Reference) Acetophenone, 2 -hydroxy- Acetophenone, o-hydroxy- 2-Acetylphenol 0-Acetylphenol AI3-12134 BRN 0386123 EINECS 204-288-0 Ethanone, 1-(2-hydroxyphenyl)- FEMA No. 3548 2 -... [Pg.328]

Sakthilatha D, Rajavel R (2013) The template synthesis, spectral and antibacterial investigation of new N202donor Schifif base Cu(ll), Ni(ll), Co(ll), Mn (II) and VO(IV) complexes derived from 2-Hydroxy acetophenone with 4-chloro-2,6-diaminopyrimidine. J Chem Pharm Res 5(l) 57-63... [Pg.389]

The syntheses of chromones and flavones [60] usually start from (2-hydroxy) ---- acetophenones. [Pg.338]

The most frequently used method for the synthesis of chromones 10 is the acid-catalyzed cyclization of (2-hydroxy)aryl-l,3-diketones 9 which are obtained from (2-hydroxy)acetophenones (advantageously in their O-silyl protected form [61]) by a Claisen condensation. Bis-(trichloromethyl)carbonate/DMF (dimethylformamide) effects the cydization 9 10 very efficiently [62]. [Pg.338]

An alternative route to P-diketones 9 is the base-induced isomerization of (2-acyloxy)acetophenones 11 (Baker-Venkataraman rearrangement), which are readily obtained from O-acylation of (2-hydroxy)acetophenones. The Baker-Venkataraman rearrangement can be interpreted as a 1,5-acyl migration in the enolate 12 and is valuable for the synthesis of flavones [61] ... [Pg.338]

COCH3 Preparation by bromination of 5-chloro-2-hydroxy-acetophenone in acetic acid (65%) [1792],... [Pg.662]

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