A Acetone

If it is inconvenient to add sulfur tetrafluoride directly from a cylinder, it may first be condensed in a calibrated trap containing a boiling chip and cooled in a acetone-dry ice bath. When cooled to — 78°, 119 g. of sulfur tetrafluoride is about 62 ml. The sulfur tetrafluoride can be added to the cooled flask by allowing it to distil slowly from the trap. 

A. Acetone cyanohydrin nitrate. White fuming nitric acid (106 ml., 158 g., 2.3 moles) (Note 1) is added dropwise to 380 ml. (408 g., 4.00 moles) of acetic anhydride at 3-5° contained in a 2-1. three-necked flask fitted with a stirrer, a thermometer, and a dropping funnel and immersed in an ice bath. After the addition, which requires 45 minutes, the mixture is stirred at 5° for 15 minutes (Note 2). Acetone cyanohydrin (92 ml., 85 g., 1.00 mole) (Note 3) is added dropwise to the mixture at 5-10° over a 45-minute period. After the addition, the ice bath is removed and the mixture is allowed to warm to room temperature and is stirred there for 30 minutes. It is then poured into 600 g. of ice... 

C16-0087. When the foiiowing substances dissoive in water, what major species are present (a) acetone (b) potassium bromide (c) iithium hydroxide and (d) suifuric acid... 

Fig. 2. Left catalytic oxidation of C3 organic compounds over MgCr204. Conversion of propane A acetone X acrolein propene. Right catalytic oxidation of 2-propanol over MgCr204. conversion of 2-propanol selectivities to acetone A propene X COx-...

That oxetane formation results from a singlet state reaction follows from the following evidence (a) Acetone fluorescence is quenched by addition of the olefin, (b) oxetane formation is relatively insensitive to piperylene, and (c) cis-trans isomerization of the olefin is quenched at high olefin concentrations but oxetane formation is not affected. Since oxetane formation was... 

The following Tables constitute a list of most of the known, characterized derivatives of sucrose. The names of the solvents used for measuring the specific rotations are abbreviated as follows A, acetone C, chloroform Dm, dichloromethane E, ethanol M, methanol Mf, N,N-dimethylformamide P, pyridine and W, water. 

Figure 3.33 Plots of retention times t of (a) acetone and (b) first enantiomer of 39 to elute on cellulose tris(phenylcarbamate) derivatives against Hammett parameter a of substituents. (Reprinted with permission from Ref. 130. Copyright 1986 by Elsevier Science.)...

Fio. 26. Methylene group selectivity, ocn,i of several hydroorganic mobile phases when octadecyl silica stationary phase is used. The selectivity is the ratio of the retention factor of a member of a homologous series to that of another member which differs in having one less methylene group. The solvents shown here are (A) acetone, (B) acetonitrile, and (C) methanol. The dau were taken at ambient temperature and the selectivity values are plotted on a logarithmic scale. Reprinted with permission ftom Kaiger et al. (/4S).. ... 

The following abbreviations are used W (water), M (methyl alcohol), E (ethyl alcohol), A (acetone), C (chloroform), P (pyridine), EA (ethyl acetate), and B (benzene). 

Figure 1. Optical photomicrographs of benzoic acid, obtained at a magnification of lOOX, for product isolated from (a) acetone-water, (b) methanol-water, and (c) water.

The following Tables list the aldose oxirane derivatives that have been prepared. The solvents used in determination of the specific rotation are given by A, acetone C, chloroform E, Ethanol E.A., ethyl acetate M, methanol P, pyridine and W, water. 

Quenching of Singlets of Carbonyl-Containing Compounds, a. Acetone. Recent reports have shown that singlet complications are not restricted to hydrocarbons for example, the photodecomposition of 1,4-dichlorobutane (52) to free radicals is sensitized by the (n, n) singlet state of acetone.216 Besides the observations that 52 quenches acetone fluorescence and that... 

Problem 18.47 What is the product of catalytic hydrogenation of (a) acetone oxime, b) propane-1,3-dinitrile, (c) propanal and methylamine M... 

Table 4. Effects of varions lipid fractions of chloroform methanol extract (1 1,v/t) (a), acetone- soluble and -insoluble fractions (b), and n-hexane-soluble and -insoluble fractions (c) on tumor volume at 20 d and tumor weight at 21 din sarcoma 180-bearing mice1...

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