2-Acetoxy-benzoic acid

Acetylamino-2-acetoxybenzoyl chloride was obtained by reaction of 5-acetylamino-2-acetoxy-benzoic acid with thionylchloride. 

Acetylsalicylic acid (aspirin) 2-(acetoxy) benzoic acid 2-acetoxylbenzoic acid... 

AB-type polycondensations, 330 AB-type polymers, 135 Accelerated weathering tests, 245 Acceptor-catalytic polyesterification, 75 4-Acetoxy benzoic acid, poly esterification of, 74... 

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 above conclusion on the role of reactivity ratios on microstructure assumes the absence of rapid transesterification reactions between chains. Since such processes might also tend to randomize the microstructure, it seemed important to isolate the role of interchain transesterification. A unique experiment was designed in which a 13c labeled carbonyl in acetoxy benzoic acid monomer (B ) was reacted with the dimer of HBA-HNA. At 99% enrichment, the only resonances in the carbonyl region of the spectrum will arise from the enriched benzoic acid carbonyl. In the absence of any interchain transesterification the microstructure of the polymer would consist only of B -B dyads (see scheme 1). 

Fig. 7. Phase diagram of copoly(ester-imide)s prepared from the imide 16a and 4-acetoxy-benzoic acid [47]...

A detailed study yielding the phase diagram of Fig. 7 was elaborated by the author [47] and later confirmed by another research group [49]. The existence of a nematic phase depends very much on the molar ratio of the comonomers. A high molar fraction of 16a is detrimental for the LC-phase. LC-PEIs containing ethylene glycol (25) were obtained by transesterification of PET with 4-acetoxy-benzoic acid and smaller amounts of acetylated 16a [50]. 

Transesterification reactions between poly(ethylene terephthalate) PET, and acetoxybenzoic acid (ABA) were conducted using the melt polymerization technique to understand the transesterification kinetics of a phase segregated system. The transesterification kinetics of two compositions PET 20 / 80 (ABA) and PETIO / 90 (ABA) have been studied at 260, 275, 290 and 305°C using dibutyl tinoxide (0.1 mole percent) as a catalyst. Homopolymerization of acetoxy benzoic acid was also studied at similar temperatures and catalyst concentration. 

Li Xin-Gui. (1999). Structure of Liquid Crystahine Copolyesters from two Acetoxy-benzoic Acids and Polyethyleneterephthalate. J. Appl. Polym. Sci., 73(14), 2921-2925. 

Melt spun fibers of copoly(HBA/DHN/TPA) were obtained from Celanese Research Company for three monomer mole ratios 60/20/20, 50/25/25, and 40/30/30. These copolymers had been prepared by melt copolymerization of the three monomers (using the acetoxy derivatives of HBA and DHN) as described by Calundann [9]. Melt spun fibers of HBA-modified PET were supplied by Tennessee Eastman Company, and contained 60 and 80 mole % HBA. These had been synthesized from PET and 4-acetoxy-benzoic acid by transesterification in the melt, as described by Jackson and Kuhfuss [10]. 

An understanding of the melt polyesterification kinetics is a must to economise on the process productivity and to improve the polymer properties. There is no published literature on the melt polyesterification kinetics of PBT, HQDA and TA. Kinetic investigation of copolymerisation between PET and 4-acetoxy benzoic acid (PET/OB) did not reveal precipitation of poly (4-oxybenzoate). Here we explore the kinetics of a three component system, wherein many parallel reactions take place simultaneously. Homopolymerisation between HQDA and TA lead to a rigid rod system. 

The work was carried out with the following objectives (1) To identify plausible routes to simplif the kinetics of a three component system (2) To determine the kinetic order with respect to the homopolymers of HQDA and TA as well as the copolymers of PBT, HQDA and TA (3) To predict the rates of acetic acid generation during the homopolymersiation and copolymerisation reactions and (4) To check whether precipitation constitutes an added complication, as ob.served in the earlier study on one component 4-acetoxy benzoic acid system. 

There has been no evidence of kinetic studies of melt transpolyesterification of PBT-TA-HQDA ternary system. An earlier study relating to copolyesterification of PET and 4-acetoxy benzoic acid did not manifest precipitation of poly(4-oxybenzoate) °. This work is an attempt to investigate the melt reaction behaviour of the PBT/HQDA/TA system. The work is presented as follows A simple reaction sequence is suggested to outline the dominant steps involved. The major reactions, which lead to acetic acid production, are taken into account in the kinetic analysis. Simple second order kinetics is found to be effective for each of the steps significant to the acetic acid production. The correctness of this procedure is justified by experimental observations. Finally, physico-chemical characterization of the copolyesters are considered. 

Liquid crystal copolyesters have been synthesized [50-56] on the basis of -acetoxybenzoic acid, acetoxybisphenol, terephthalic acid and m-acetoxy-benzoic acid by means of polycondensation in melt. All the copolyesters are thermotropic and form nematic phase. The types of LQPs of -oxybenzoic acid are given in Table 3.2. 

A solution of 2o, 3o, 16o, 17o -diepoxy-17/3-acetoxy-5o -androstane (25 grams), prepared from 3,17-diacetoxy-5o -androstane-2,16-diene Chem. Abs. 1960, 54, 8908) by treatment with m-chlor-per-benzoic acid, in piperidine (120 ml) and water (40 ml) was boiled under reflux for 5 days, the solution was concentrated and the product precipitated by the addition of water. The solid was collected, dissolved in dilute hydrochloric acid, filtered to give a clear solution and precipitated by the addition of sodium hydroxide soiution. Crystalliza-... 

Treatment of A-acyloxy-A-alkoxybenzamides 76a with dilute aqueous sodium hydroxide, at room temperature, resulted in the rapid formation of alkyl benzoates 67.40 A crossover experiment using A-acetoxy-A-butoxy-/ -chlorobenzamide 26e and A-acetoxy-A-benzyloxybenzamide 27a resulted in the exclusive formation of butyl / -chlorobenzoate (46%) and benzyl benzoate (43%) esters along with the hydrolysis products, / -chlorobenzoic acid and benzoic acid indicating that ester formation involves an intramolecular process. 

A-Acetoxy-A-butoxybenzamides (101) react in aqueous acetonitrile by an autocat-alytic process. In the presence of added mineral acid, they undergo acid-catalysed AaiI solvolysis forming A-aroyl-A-butoxynitrenium ions (102), which are trapped by water. The hydroxamic acid product (103) reacted under the conditions to give a range of products that included, n-butanol, butanal, benzoic acids, benzohydroxamic acids and butyl benzoates (Scheme 18)92.93,95, ns, i56 ... 

Acyloxylation of aryl olefins probably involves radical cations as intermediates. Acetoxylation of frans-stilbene in anhydrous acetic acid/sodium acetate yields mainly meso-diacetate, while in moist acetic acid mainly threo-2-acetoxy-l,2-di-phenylethanol is formed 100 Anodic oxidation of trans- and ds-stilbene in ace-tonitrile/benzoic acid produces with both olefins the same mixtures of meso-hydrobenzoin diacetate (62) and f/ireo-2-benzoyloxy-l,2-dip]ienylethanol (63) l01 Product formation is best rationalized by a ECiqE-sequence leading to theienerge-tically most favorable acyloxonium ion (64) (Eq. (125) ) ... 

Contributions of both the hydrophobic and the coulombic interaction are indicated in the hydrolyses of 3-nitroacyloxy benzoic acid (8) by poly(5(6)-vinyl-benzimidazole) (67) and of 3-acyloxy-N-trimethylanilinium iodide (acyloxy group in lieu of acetoxy group in ANTI (6)) by poly(5(6)-vinylbenzimidazole-co-acrylic acid), poly(BI-ac) (68). 

Proof of the structure [xi] was sought and found by the oxidation of phenyldihydrothebaine with alkaline potassium permanganate, which resulted in the production of benzaldehyde, benzoic acid, and 4-methoxyphthalic acid. By exhaustive methylation of the methyl ether the optically active (+)-3 4-dimethoxy-2-(5-methoxy-2-vinylphenyl) stilbene [xn] (prepared by Freund [1], but stated to be optically inactive) was obtained, and permanganate oxidation of this afforded 5 6 5 -trimethoxydiphenaldehyde [xm] (also obtained by the ozonoly-sis of [xn]) and 5 6 5 -trimethoxydiphenic acid [xrv] (also obtained by oxidation of [xm]). This acid was identified with an authentic specimen prepared in stages from 4-acetoxy-3 6-dimethoxyphenanthrene quinone (acetylthebaolquinone [xv]) [6-7, 9-10],... 

Thermally stable copolymers of 3-(trimethylsiloxyl)- and 3,5-bis(trimethylsiloxyl)benzoyl chloride (4A) or 3-acetoxy- and 3,5-diace-toxy-benzoic acid (4B) were prepared with mole ratios of AB AB2 monomer ranging from 160-5.32 Polymers containing 10-20 mole % of branching monomers were insoluble in CHC13 but soluble in polar solvents, such as A,A-dimethylformamide (DMF) or a mixture of pyridine and benzene. Compared to the linear homopolymer of 3-hydroxy-benzoic acid, the branched polymer showed lower crystallinity and slower crystallization. There was an inverse linear relationship between percent crystallinity and the number of branches in the chain. Similarly, in an attempt to improve moldability and decrease anisotropy of rigid aromatic polyesters, 0.3-10 mole % of 1,3,5-trihydroxybenzene, 3,5-di-hydroxybenzoic acid, and 5-hydroxyisophthalic acid were copolymerized with p-hydroxybenzoic acid/terephthalic acid/4,4 -dihydroxy-diphenyl.33 The branched polymer showed a lower orientation and possessed improved flex properties. 

Acetoxy-2,4-dlmethyl-m-dloxane, Benzoic acid Caprylb acid, Chbroxylenof, Dowicil 75 7-Ethylbicyclooxazoldine, Gyceryl caprate... 

Methylacetopyronone. See Dehydroacetic acid Methyl 12-acetoxy-9-octadecenoate Methyl 12-acetoxyoleate. See Methyl acetyl ricinoleate Methyl acetylacetate Methyl acetylacetonate. See Methyl acetoacetate Methyl acetylaminobenzoate CAS 2719-08-6 EINECS/ELINCS 220-318-5 Synonyms 2-(Acetylamino) benzoic acid, methyl ester Acetyl methyl anthranilate Acetyl-N-methyl anthranilate Methyl 2-(acetylamino) benzoate Methyl N-acetylanthranilate Empiricai C10H11NO3... 

Acetoxy-2,4-dimethyl-m-dioxane Alkyl dimethyl ethylbenzyl ammonium chloride p-Anisic acid Benzoic acid p-Bromo-3-nitrostyrene... 

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