Acetone description

Ketene by Pyrolysis ground-glass joint H) so that it can be removed from the P3rrdysis chamber (E) whenever desired. Filament 0 is prepared from 175 cm. of B. and S. gauge 24 Chromel A wire (an... 

The US. Pharmacopeia (USP XXII) or National Formula (NFXVII) (20) also provide a similar description however, the peroxide value is not defined (Table 9). These specifications are also given in the Handbook of Pharmaceutical Excipients (HPE), pubhshed jointiy by the American Pharmaceutical Association and The Pharmaceutical Society of Great Britain (21), which defines lecithins both from plants and eggs. The Merck Index (22) specifies a slightiy lower acid value. The Japanese Monograph (ISCI-II) (23) specifies a slightiy lower acetone-insoluble matter and a lower heavy-metal content. 

Diacetunamine has been prepared in satisfactory yields by treating a mixture of commercial acetone and calcium chloride with anhydrous ammonia. The preparation from commercial acetone and ammonia is laborious and gives low yields. No yields are given in the older published descriptions of the preparation from mesityl oxide with either aqueous or anhydrous ammonia. The method described here has recently been published. ... 

However, dendrimeric and hyperbranched polyesters are more soluble than the linear ones (respectively 1.05, 0.70, and 0.02 g/mL in acetone). The solution behavior has been investigated, and in the case of aromatic hyperbranched polyesters,84 a very low a-value of the Mark-Houvink-Sakurada equation 0/ = KMa) and low intrinsic viscosity were observed. Frechet presented a description of the intrinsic viscosity as a function of the molar mass85 for different architectures The hyperbranched macromolecules show a nonlinear variation for low molecular weight and a bell-shaped curve is observed in the case of dendrimers (Fig. 5.18). 

The red tetrasulfide radical anion 84 has been proposed as a constituent of sulfur-doped alkali hahdes, of alkah polysulfide solutions in DMF [84, 86], HMPA [89] and acetone [136] and as a product of the electrochemical reduction of 8s in DM80 or DMF [12]. However, in all these cases no convincing proof for the molecular composition of the species observed by either E8R, Raman, infrared or UV-Vis spectroscopy has been provided. The problem is that the red species is formed only in sulfur-rich solutions where long-chain polysulfide dianions are present also and these are of orange to red color, too (for a description of this dilemma, see [89]). Furthermore, the presence of the orange radical anion 8e (see below) cannot be excluded in such systems. 

Stream name, a brief, one or two-word, description of the nature of the stream, for example ACETONE COLUMN BOTTOMS . 

During water-gas shift in pyridine solution, they isolated [PtH(py)L2]BF4, while from water-gas shift run in acetone solution, they isolated raft -[PtF[(CO)L2]BF4. The results indicated a solvent effect. That is, it was difficult to substitute coordinated pyridine with CO, but it was easier to substitute acetone with CO, via [PtH(Solvent)L2]OH + CO <-> [PtH(CO)L2]OH + Solvent. Following this important solvent-facilitated CO addition, they proposed a nucleophilic attack of OH-on the coordinated CO, via [PtH(CO)L2]OH <-> [PtH(COOH)L2]. The next step is thermal decomposition of the species, liberating C02, via the decomposition [PtH(COOH)L2] <-> [PtH2L2] + C02. CO addition was proposed to assist in decomposing the hydride to liberate H2. A more detailed description of the catalytic cycle is provided in Scheme 19. 

It is necessary to mark, that as difference to work [1] in presented research for description of electrophilicity more preferable Reichardt parameter (value ET) [2] is applied but not electrophilicity E offered by Koppel-Pahn. As analogy with [1] the exclusion from equation (2) the data for one of solvents - acetone or ethylacetate allows to obtain an equation for lg(k) with R > 0.99. 

Note that a high-boiling azeotrope is formed between acetone and chloroform. The above problem description and mixture analysis helps us to define the CAMD problem. 

The effect of phenol on benzo[a]pyrene (B[a]P) carcinogenicity has been examined (Van Duuren and Goldschmidt 1976 Van Duuren et al. 1971, 1973). Dermal application of 3 mg phenol in acetone simultaneously with 5 g B[a]P resulted in significantly fewer tumors than application of B[a]P alone. Application surface areas were not reported and could not be estimated from the description of the application procedure. Mice treated dermally with B[a]P followed by dermal application of brewed tea on alternate days over a period of 55 days developed epithelial cell carcinoma or exhibited various stages of squamous cell tumors (Kaiser 1967). The brewed tea contained an unspecified level of phenol, the presumed cancer promoter in this experiment, as well as cresols and dimethylphenols. 

Figure 3. Effect of EME 58 (58 wt% mercaptoester units co-polymer) coupling agent concentration on the peel strength of flexible epoxy (amine-cured)/AD = acetone-degreased steel test panels following (a) I day and (b) 3 day exposure to 57°C condensing humidity. See Appendix 4 for epoxy resin and cure description.

Industrial poisoning. The production of silicone products uses substances harmful for human health. These are inorganic substances (ammonia, chlorine, sodium and potassium hydroxides, sulfuric and hydrochloric acids, hydrogen chloride) and organic compounds of various types, such as hydrocarbons (methane, benzene and its homologues), chlorine derivatives (methyl- and ethylchloride, chlorobenzene), alcohols (methyl, ethyl, n-butyl, hydrosite), acetone, pyridine, etc. The information about their toxicity, explosion hazard, effect on human body, as well as maximum allowable concentrations of gases and vapours in the air at workplace can be found in special references.(Ryabov 1970). A comprehensive description of silicone substances is given in Table 29. 

A detailed description of the excimer set-up is given in reference [63a], The potassium salt of 12 g (31.7 mmol) A-phthaloylanthranilic acid amide 81 was irradiated in ca. 2000 mL of water/acetone (40 1) for 3h. The crude reaction mixture was extracted with ethyl acetate, the combined organic layers were dried over MgS04 and evaporated to give 5.5 g of the pyrrolobenzodiazepine 82 (52%, 4 6 tran cis-mixture). Alternatively, a Rayonet photochemical reactor equipped with phosphor coated 300 lOnm lamps can be used for reactions on a smaller scale. 

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