Methyl acetate violet

A soln. of diphenyldichlorosilane in methyl acetate as an inert solvent added portion wise with shaking to a mixture of 1.5-2 moles of ZnO and methyl acetate, then gently refluxed for ca. 11 min. until color change of crystal violet indicates completion of the reaction hexaphenylcyclotrisiloxane. Y 97%. T. Takiguchi et al., J. Org. Ghem. 25, 310 (1960). 

The poiymer has a Qc of 3096cai/g (Ref liq H20 at 25°), an impact sensy of 85cm at the 50% point using a BM machine with a 2kg wt (RDX, 28cm), power by Bal Mortar of 96 (TNT=100), a thermal stability at 65.5° of 10 mins using a 1.3g sample with Kl-Starch paper as the indicator (Ref NC, 10 mins, no color), a thermal stability at 134.5° of 78 mins using Methyl violet indicator paper (Ref NC, 30 mins, no color), and a rel vise of 1.7 centipoises using a 1% acet soln at 25°... 

The purity of the product can be determined 3 6 by titration in glacial acetic acid, using perchloric acid (in glacial acetic acid) as titrant and methyl violet (0.2 g. of methyl violet in 100 ml. of chlorobenzene) as visual indicator (the first appearance of blue color is taken as the end point). 

Chlorpromazine hydrochloride was assayed in neutral solvents such as acetone or acetonitrile with a glacial acetic acid solution of perchloric acid. The combination of methyl violet and bromcresol green served as a mixed indicator [57]. 

Nitro-2-hydrazinotoluene, It golden-yel or orn-yel ndls with a violet tinge (from ale), mp 179-80° diffc sol in hot ale xylene was prepd by heating the K salt of N-[4-Nitro-2-methyl-phenyl] -hydrazine-N,N -disul-fonic acid with coned HC1 (Refs 1 3) 3-Nitro-4-hydmzinotoluene, dk-red ndls (from eth), mp 110—11° v sol in acet sol in eth, chlf benz si sol in petr eth was prepd by diazotizing 2-nitro-4-methylaniline with Zn chloride HC1. Its Hydrochloride salt, C7H9N3O2+HCI, orn-red ndls or plates (from w) dec at 190-91° (Refs 2 4)... 

Normal methyl violet test paper is prepd by soaking filter paper in a normal solution of rosaniline acetate-crystal violet and drying... 

Similarly with the raising of the b.p. in violet or reddish-violet soln. of iodine in benzophenone, carbon disulphide, ethyl chloride, chloroform, carbon tetrachloride, ethylene chloride or benzene or in brown soln. of ethyl alcohol, methyl alcohol, thymol, ethyl ether, methylal, or acetone. The values for the last three solvents were rather low, presumably because of the chemical action of solute on solvent. High values with benzene are attributed to the formation of a solid soln. of solvent and solid. Confirmatory results were found by J. Hertz with naphthalene, and by E. Beckmann and P. Wantig with pyridine. The results by I. von Ostromisslensky (o-nitrotoluene), by G. Kriiss and E. Thiele (glacial acetic acid), and by H. Gautier and G. Charpy indicate polymerization, but they are not considered to be reliable. 

Heat test at 134.5°C. This heat test is in use in the U.S.A. A sample of 2.5 g of nitrocellulose or nitrocellulose powder ( single base powder ) is kept in a long test tube in a constant temperature bath regulated to 134.5+0.5°C. A band of methyl violet (rosaniline acetate with crystal violet) test paper is kept over the surface of the sample. The test paper should not change to salmon colour before 30 min and no visible N02 vapours should be detected before 45 min. 

Hrf.N C(CH,).C(NOj G.N N.NH6c(NO.,).-C(CH3) NilH mw 295.23, N 42.72% yel crysts, mp 151-2°, dec violently with evolution of gas dissolves in dil NaOH giving an intense violet-red soln, which on acidification reppt the compd unchanged insol in aq alk carbonates was prepd by treating 3-methyl-4-nitro-5-amino -pyrazole in HC1 at 0° with NaN02 and Na acetate for several hours. This compd forms an orn-red Silver salt reacts with diazomethane to form the trimethyl deriv, a yel compd, mp 163-4° (dec) and with phenylisocyanate,... 

The coloration obtained should be compared with that produced by adding the same quantity of methyl violet solution to 20-25 c.c. of a 2% solution of pure acetic acid. 

This is the solid residue left when turpentine is distilled for the preparation of oil of turpentine. It consists essentially of resin acids and their oxidation products and forms brittle, translucent masses with a peculiar resinous odour and a colour varying from pale yellow to dark brown D = 1 05-1 085. It is readily soluble in alcohol (1 part in 10 parts of 70% alcohol) and dissolves also in methyl or amyl alcohol, ether, acetone, benzene, chloroform, carbon disulphide or oil of turpentine in petroleum ether it is not completely soluble. It is easily and completely saponified by caustic soda solution. Addition of a drop of concentrated sulphuric add to a solution of a small quantity of colophony in acetic anhydride produces an intense violet-red or purple coloration, soon changing to yellowish-brown. Different types or grades of colophony are sold, distinguished mainly by the colour and origin. 

Test Papers. See under Methyl Violet Tests in Vol 8, M118-Lto M120-L, and Lead Acetate in Vol 1, A28-R... 

The a-surface of acetic acid is most colorful. The sp2-oxygen is slightly less polar than that of acetone, and the hydroxyl oxygen is less polar than in water, but the acidic hydrogen is much more polar than those of water and alcohols, causing a change into violet on the a-surface. The methyl group is quite similar to those of acetone. 

Whereas in L Air du Temps it is the woody-iris character of the methyl ionone that develops in combination with the vetiveryl acetate, in Paris it forms the basis of a violet accord, with Iso E Super as the woody note. Iso E Super, one of the most important of the newer synthetics, is another chameleon-type product combining woody and amber aspects with some of the character of methyl ionone. Used in Paris as part of the L Air du Temps structure, it forms a natural link between the other materials and the violet accord. 

Add 1 drop of methyl violet indicator solution and introduce dilute HC1 or dilute NH3 solution (as necessary) dropwise and with constant stirring until the colour of the solution is yellow-green a blue-green colour is almost but not quite acid enough, yet it is acceptable for most analyses. (If the indicator paper is available, the thoroughly stirred solution should be spotted on fresh portions of the paper.) It is recommended that a comparison solution containing, say, 10 ml of 0-3m HC1 and 1 drop of indicator be freshly prepared this will facilitate the correct adjustment of the acidity. A more satisfactory standard is a buffer solution prepared by mixing 5 ml of m sodium acetate, 5 ml of 2m HC1, and 5 ml of water this has a pH of 0-5. 

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