Di aceto

Polymers were prepared by AIBN-initiated free-radical polymerization in degassed toluene at 6O C. With the exception of poly(4-aceto-l-naphthyl methacrylate), the polymers precipitated on formation. Polymers were purified by reprecipitation from CHCl 3 into methanol. Copolymer compositions were determined by UV spectroscopy using the extinction coefficients of the corresponding homopolymers and of 2,4-di aceto-l-naphthyl methacrylate monomer as references. Tables I and II list the properties of the homopolymers and copolymers used in the present study. 

Reported temperatures for this polymerization vary somewhat depending on the metal cation. With Cu(II), a maximum temperature of I05°-110°C was employed (SS). Temperatures as high as 260°C were used in other cases (76). With Be(II), this method has yielded very high molecular weight, soluble polymer. Fractionation of the product obtained from Be(II) and 4,4 -di(aceto-acetyl)diphenyl ether yielded a fraction with an osmometric molecular weight of 126,000 (76). A product with an intrinsic viscosity of 1.2 was obtained from sebacoyl diacetone and Be(Il) using a melt, bulk procedure (86). 

ROMP was carried out in absolute chlorobenzene under N2 in a glove box using Mo(CH-r-butKNAr)(0-r-but)2 13) as the catalyst. Than the polymers were precipitated in a > 5 fold excess of methanol, washed and dried. If impiuities (monomer, catalyst, etc.) were detected in the polymer (colored polymer, or by means of IR- or NMR-spectroscopy) the polymer was repredpitated from for further purification. In one case K2RUC35 H2O and 23 di-aceto -7-oxa-S-norbomene (ca. 5 mol% of the 2,3-diacet037-S-norbomene) in ethanol/water (1 1) was used as the initiator, but no drastic differences in the pofymer properties were observed (9) (more details about the initiating system see ref.) 14). 

It follows therefore that ethyl malonate can be used (just as ethyl aceto- acetate) to prepare any mono or di-substituted acetic acid the limitations are identical, namely the substituents must necessarily be alkyl groups (or aryl-alkyl groups such as CjHjCHj), and tri-substituted acetic acids cannot be prepared. Ethyl malonate undergoes no reaction equivalent to the ketonic hydrolysis of ethyl acetoacetate, and the concentration of the alkali used for the hydrolysis is therefore not important. 

The preparation of dithianes from enamines by reaction with trimethylene dithiotosylate (propane-1,3-dithiol di-p-toluenesulfonate) has been applied with enamines derived from oholostan 3 one, aceto-acetic ester, and phenylacetone.6 7 Reactions of trimethylene dithiotosylate with hydroxymethylene derivatives of ketones also give rise to dithianes thus the hydroxymethylene derivative of cholest-4-en-3-one can be converted to 2,2-(trimethylenedithio)cholest-4-en-3-one. 1,3-Dithiolanes are obtained in a similar manner by reaction of ethylene dithiotosylate1 with the appropriately activated substrate.5,7... 

The difference in behaviour between crown ethers and cryptands is also evident from the results reported for the reaction of AgNOs with aceto-bromoglucose [111) (14). In the presence of equimolar amounts of di-... 

Medi- anol Aceto- nitrile Eth- anol Ace- tone Di- oxane Isopro- panol Tetrahy- drofriran ... 

See Acetotetrazacydooctane Acetyltetrozonononediol-di acetate, Trinitro. See under Acetyldiacetozytetrazanonane Acetyltriozacyclohexane and Derivatives. See Aceto tri a zacy clo h ex an e... 

Reaction XLIV. (b) Condensation of Alkyl and Aryl Halogen Compounds with the Sodio- and other Metallo-derivatives of Ethyl Aceto-acetate and its Homolognes. (A., 186, 214 201, 143 213, 143.)—Like malonic ester, acetoacetic ester contains two 1 3-carbonyl groups with a methylene group in position 2. It is only to be expected then that it yields with metallic sodium or sodium alcoholate sodio-derivatives from which mono- and di-, alkyl and aryl homologues can be obtained by treatment with a suitable halide, including halogen esters. Acetoacetic acid... 

An interesting example of neighboring-group participation is the formation of di-0-acetyl-l,4-anhydro-a-L-rhamnopyranose (XLIV) on reaction of a-aceto-L-rhamnosyl bromide (XLIII) with trimethylamine in... 

Verschiedene Phosphorsaure-nucleosidester reagieren als Pyridinium-Salze mit Di-phenyl-disulfan/Tributyl-phosphan (vorzugsweise jeweils 10 Molaquivalente) in Aceto-nitril unter Bildung von Phosphorsaure-O-nucleosidester-S-phenylestern... 

See Acecotetrazacyclooctane Acetyltetrezanononediol-di acetate, Trinitro. See under Acetyldiacetoxytetrazanonane Acetyltrlozacyclohexane and Derivatives. See Aceto tri a zacy do h ex an e Acetyl trinitroani line. See 2,4,6-Trinitro-acetanilide, under Acetanilide Acetyltrinitrotetrazacyclodctane. See 1-Aceto-3,5,7-trinitto-1,3,5,7-tetrazacyclo-octane, under Acetotetrazacycloo ctane Acetylore(Fr). Acetylide... 

Di acetophenone Diperoxide. See Aceto-phenoneperoxlde, Dimeric A48-R 1,9-Di acetoxy-2-acetyl-4,6,8-trinitro-2,4,6,8-cetrazanone or H-16. See under Acetyl-diacetoxytetrazanonane A57-R 1,2-Diacetyl ethane. See A cetoayl acetone A46-R... 

Ethyl ester of di-methyl aceto acetic acid... 

Aceto Acetic Ester S3mtheses.— These alkyl and acyl derivatives of ethyl aceto acetate, both the mono- and the di- derivatives, react now on hydrolysis in the two ways given above, i.e.y by Xheketonehydro-lysis or the acid hydrolysis and we may thus obtain a large number of ketones and acids as desired. 

Di-methyl aceto acetic ester Methyl iso-propyl ketone... 

From Aceto Acetic Ester.—The simplest di-ketone, which is naturally an fl//>/fd-di-ketone, is CH3—CO—CO—CH3, di-acetyl. It is made from methyl aceto acetic ester by an interesting reaction involving the ketone hydrolysis. When aceto acetic ester is treated in the hot with dilute alkali the ketone hydrolysis takes place. If, however, the treatment is in the cold, hydrolysis results simply in the formation of the potassium salt. 

CeHs—CO—CH3, Phenyl methyl ketone or Aceto phenone. and CeHe—CO—CeHs, Di-phenyl ketone or Benzo phenone. 

S3mthesis of Collidine.—The most important synthesis of pyridine homologues is that of collidine from which pyridine may be obtained by elimination of the methyl groups by oxidation and loss of carbon dioxide. When aldehyde ammonia is heated with aceto-acetic ester a derivative of a di-hydrogenated collidine is obtained, as follows ... 

Many investigators have attempted to isolate mercury derivatives from aceto-acetie ester, but the results have been so varied that no reliance can be placed on any of the early work on this compound. Kharasch and Staveley, however, have obtained definite results by heating mercury salts of substituted acetic acids in vacuo, e.g, di-method and diethyl aceto-acetic acids when dried and heated in vacuo at 90 C. evolve carbon dioxide, and the mercury becomes bound to the carbon atoms which were formerly attached to the carboxyl groups —... 

Mercury bis-a-acetyl-a-isopropyl or Mercury-bis-aceto-di-methyl-methane, [CHgCO.CMeg—JgHg.—Mercuric dimethyl aceto-acetate is heated in a vacuum at 90 C., when it is found to lose two molecular equivalents of carbon dioxide, which is shown by the loss in weight. The resulting mass is extracted with acetone, and the solvent removed m vacuo, the product isolated melting at 120 C. It is soluble in acetone, alcohol, toluene, or xylene, but only slightly soluble in ether. Mercuric sulphide is split off from it by the action of ammonium sulphide, but no mercuric oxide is formed when sodium hydroxide is added. The compound soon decomposes with the deposition of metallic mercury. 

If the above diacetoxy compound is acetylated, diacetoayymercun-aceto-m-toluidide is formed. It is insoluble in organic solvents, slightly soluble in hot water, and easily soluble in ammonium hydroxide. With iodine 4 6-di-iodoaceto-m-toluidide is obtained. In a similar manner the triacetoxymercuri compound yields a toluidide, as a heavy insoluble powder. 

Aziz, S., Khan, A. U. Oxidation of Di Ethyl Ethyl Aceto Acetate by selenium-di-oxide in acidic medium A KINETIC STUDY. Ultra Scientist of Physical Sciences 1998, 10, 240-244. 

Control over TBV and its reputation is protected by the constitution of local associations of producers and experts in the field, usually called Consortia. The aim of these Consortia is to promote the culture of TBV and to survey their production and distribution. There are now four active Consortia in both of the interested cities—Modena and Reggio Emilia— with the same purpose and functions. For the TBV of Modena, these are Consorzio Produttori Aceto Balsamico Tradizionale di Modena, Consorzio... 

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