O-acetoxy

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. ... 

In an open beaker containing a magnetic stir bar, 1.8 g (0.010 mole) of ethylenediamine-iV.N -diacetic add is neutralized with 0.80 g of sodium hydroxide in 10 mL of water and diluted with 25 mL of ethanol. o-Acetoxy-benzyl bromide4 (4.6 g, 0.020 mole) is added. The clear solution is maintained... 

ASA CH3COOC6H4COOH o-acetoxy benzoic acid (acetylsalicylic acid) white crystals with a slightly bitter taste excessive use may cause hearing loss or Reye s syndrome, especially in young people used in Aspirin and related medicines for pain, fever, and inflammation... 

The oxidation of various allyl ethers and acetates with internal alkenes using PdCl2/CuG/02 or PdCl2/p-benzoquinone catalyst systems gave the corresponding p-alkoxy ketones regioselectively (equation 19). No a-alkoxy or o-acetoxy ketone was detected. 

Arylsulfenyl trifluoroacetates have been generated in situ and used for the hydroxysulfenylation of al-kenes. These reagents are prepared from diaryl disulfides and LTA in trifluoroacetic acid. Yields for the addition are generally good (42-95%). The hydroxysulfenate intermediate can be oxidatively cleaved by LTA (provided the groups can achieve an antiperiplanar arrangement) to form an a-aldehyde-acetoxy sulfide in good yield (40 88% Scheme 3). 7... 

The following derivatives are stable towards ammonium sulphide p - acetoxymercuri-o-nitroaniline, o - acetoxy mereuri-p-broniodimethyl-aniline, 2 4-diacetoxyniereuri-a-naphthylaniine, and p-dimethylamino-phenylmercuric acetate. If the latter compound be boiled with potassium iodide solution, then treated with hydrogen sulphide, only traces of mercuric sulphide are produced. Mercury compounds from jS-naphthylamine, j8-naphthylamine-C-sulphonic acid, 1 5-naphthyl amine sulphonic acid are decomposed b ammonium suli hide, wiiilst naphthi-onic acid derivatives are only slowty attacked. 

It is a fine white powder, insoluble in the usual solvents, but soluble in phenol. When dissolved in an excess of 12 per cent, sodium hydroxide, carbon dioxide passed in, and the mixture slowly cooled, the sodium Hilt separates in needles which are decomposed when exposed to light. Treatment of the anhydride with hot dilute acetic acid gives the o-acetoxy-viercuri compound, which sinters at 150° C. and melts with decomposition at 163° C,... 

Diels-Alder dienes 1-Acetoxybutadiene. Butadiene. Cyclopentadiene. (rans,mins-l,4-Diacetoxybutadiene. 2,5-Di-o-anisyl-3,4-diphenylcyclopentadienone. 5,5-Dimethoxy-l, 2,3,4-tetrachlorocyclopentadienone. 2,3-Dimethylbutadiene. 6,6-Dimethylfulvene (see o-Acetoxy acrylonitrile). 2,4-Dimethyl-l,3-pentadiene (see Diethyl azodicarboxylate). 2,3-Diphenyl-butadiene. 1,3-Diphenylisobenzofurane (see Potassium I-butoxide). rrans,/nus-l,4-Diphenyl-butadiene. 1,3-Diphenylisobenzofurane. Hexachlorocyclopentadiene. Isobenzofurane. l-o-Nitrophenylbutadiene-1,3. Oxepin (see Diazabicyclo[3.4.0]nonene-S). Phenylcyclone. Piperylene. n-Pyrone (see also Methyl vinyl ketone). Tetrachlorocyclopentadienone. Tetra-chlorofurane. Tetraphenylcyclopentadienone. 

The second product identified by Meyer, oxanthrone acetate (5, better 10-acetoxy-9-anthrone), was obtained in moderate amount by oxidation of 9-acetoxy-anthracene (3) with lead tetraacetate in acetic acid. Oxidation of (3) in refluxing benzene resulted in 1,4-addition to give the triacetoxy compound (4). This substance when heated in acetic acid is converted largely into lO-acetoxy-9-anthrone (5) by loss of acetic anhydride and to a lesser extent into 9,10-diacetoxyanthracene (7) by loss of acetic acid. If (4) is an intermediate in the oxidation of (3) in acetic acid lo (5), the acetoxy group in the product (5) must be attached to a different meso carbon atom (5) than in (3), and this inference was shown to be correct by oxidation of 2-methyl-9-acetoxyanthracene and identification of the product as 2-methyl-I O-acetoxy-9-anthrone by synthesis. Both (5) and (7) on further oxidation with lead tetraacetate in acetic acid yield anthraquinone, probably via the products of acetoxylation of (5) and 1,4-addition to (7). 

In one additional example of the formation of C-arylglycosides from glycals, Ichikawa, et al.,65 illustrated the applicability of this chemistry to heterocyclic aryl species. Specifically, as shown in Scheme 2.4.15, tri-O-acetoxy glucal was treated with furan and borontrifluoride etherate. The result was a 54% yield of the desired C-furanoglycoside as a 1 1 anomeric mixture. 

Chromones and flavones 16 are formed by Pd(0)-catalyzed carbonylative cyclization of o-hydroxy- or o-acetoxy iodo arenes with terminal alkynes in the presence of Et2NH. Intermediates are the corresponding or /zo-functionalyzed aryl alkynyl ketones 15, which can be synthesized separately and cyclized by Et2NH [37]. 

Exposure of the silyl enol ethers of aldehydes to peracid in dichloromediane, followed by treatment of the intermediate masked hydroxy aldehyde (c/. (53) to (54) Section 2.3.2.1.3.i) with acetic anhydride and triethylamine, allows isolation of the product o-acetoxy aldehydes in moderate yield. Similarly treatment of the silyl enol ethers with LTA in acetic acid containing potassium acetate effects the same transformation. ... 

Verbindong CgHgNO, ) aos 4-Nitro. O-acetoxy-flaoren 6, W2. e Byso,8 2 -Nitto-diphenylsulfid-carbon< sauie.(2 10,126,1 54. 3 -Nitto.diphenylsalfid-carboiuaure.(2)... 

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