C prepare

Me2NCH2) C2H5)(Me)C-OOC Ph-HCI. Colourless crystalline powder with a bitter taste, m.p. 177-179"C. Prepared by the action of ethyl magnesium bromide on dimethyl-aminoaceione. It is a local anaesthetic, mainly used to produce spinal anaesthesia. 

M.p. 114-116 C. Prepared by racemization of hyoscyamine. It and its salts are used to dilate the pupil of the eye. Given internally they reduce the secretion of saliva and relieve spasmodic pains. 

Crystallizes as the dihydrate in colourless prisms, m.p. 253 C. Prepared by heating... 

Bromobenzene,Cf,HfSr. B.p. 155°C. Prepared from benzene by direct bromination in the presence of a carrier (Ij, Fe, AICI3) or by... 

Isobutyric acid, dimethylacetic acid, 2-methylpropanoic acid, (CHjjjCH COOH, colourless syrupy liquid with an unpleasant odour b.p. 154°C. Prepared by oxidation of 2-methylpropanol with K2Cr207 and H2SO4. Salts soluble in water. Used in alkaline solution for sweetening gasoline. 

Tertiary butyl alcohol, trimethyl carbinol, tertiary butanol. 2-methyl-2-propanol, Me3COH. Colourless prisms, m.p. 25°C, b.p. 83°C. Prepared by absorbing isobutene (2-methylpropene) in sulphuric acid, neutralizing and steam distilling the liquor. Converted to isobutene by heating with oxalic acid. Potassium-/-buloxide is a very strong base. 

C10H16N2O3. White crystalline powder, m.p. I22-124°C. Prepared by condensing ethyl butylethylmalonate with urea. It is used as a sedative and hypnotic. 

HOCH2CH2CH2CH2OH. B.p. 228"C. Prepared ethyne plus methanal, hydrogenated to butanediol. Used in production of y-buty-rolactone and 2-pyrrolidone. Widely used in polyurethane products, butylenes See butenes. 

HOCH2C = CCH2OH. White solid, m.p. 58 C, b.p. 238- C prepared by the high pressure reaction between ethyne and methanol and also from BrMgCCMgBr and methanal. Used in electroplating (Ni), as a corrosion inhibitor, and in paint and varnish removal. 

Dichloroethanoic acid, CHCljCOOH. Low-melting solid, m.p. 5-6 "C, b.p. 194°C. Prepared by the action of copper powder on trichloroethanoic acid or by the action of sodium cyanide on chloral hydrate. 

OL-crolonic acid. irans-crotonic acid. Colourless needles or large plates m.p. 72 "C, b.p. 180 C. Prepared by the oxidation of... 

Isocroionic acid, -crotonic acid, cis-croionic acid. Colourless needles m.p. 14 C, b.p. 169 C. Prepared by distilling -hydroxy-glutaric acid under reduced pressure. Converted to a-crotonic acid by heating at 180 C, or by the action of bromine and sunlight on an aqueous solution. 

Cyanogen fluoride, FCN. Colourless gas (b.p. — 46 C) prepared by pyrolysis of cyanuric fluoride. Polymerizes to (FCN), cyanuric fluoride, at room temperature. 

Insoluble in water, soluble in organic solvents b.p. — 15°C. Prepared by treating 1,4-dibromo-butane with metallic sodium. Reduced to n-butane by hydrogen at 200" C in presence of nickel catalysts. 

C8H8O4. Colourless needles m.p. 109 C, b.p. 270 C. Prepared by boiling acetoacetic... 

I. I-dichli)rt)ethene, I. l-dichloroethylene, asymmetric dichloroethene, CH2=CCl2, colourless liquid, b.p. 37 C. Prepared by heating 1,1,1- or 1,1,2-trichloroethene with excess lime at 70-80 C. Polymerizes readily to an insoluble solid. 

CH2CI2. A colourless liquid with a chloroform-like odour b.p. 4I°C. Prepared by heating chloroform with zinc, alcohol and hydrochloric acid manufactured by the direct chlorination of methane. Decomposed by water at 200°C to give methanoic and hydrochloric acids. Largely used as a solvent for polar and non-polar substances, particularly for paint removal (30%), dissolving cellulose acetate and degreasing (10%). It is more stable than carbon tetrachloride or chloroform especially towards moisture or alkali. It is somewhat toxic. U.S. production 1981 280000 tonnes. 

Crystalline solid m.p. 35-36 "C, b.p. 154--156 C, prepared by oxidizing A,A -dicycIo-hexylthiourea with HgO in carbon disulphide solution, also obtained from cyclohexylamine and phosgene at elevated temperatures. Used as a mild dehydrating agent, especially in the synthesis of p>eptides from amino-acids. Potent skin irritant. 

CH3CH2)2S. a colourless liquid with an ethereal odour when pure usually it has a strong garlic-like odour b.p. 92°C. Prepared by the action of KHS on ethyl chloride or potassium ethyl sulphate. When heated at 400-500°C it forms thiophene. 

Colourless liquid b.p, 28" C. Prepared from (C1CH2CH2)20 with fused KOH in a NHj atmosphere or in ethylene glycol at over 200 C. Readily oxidized by air. slowly polymerizes to a jelly. 

Ethylamine, monoethylamine, CH3CH2NH2-B.p. 19 C. Prepared by reduction of acetonitrile or by heating ethyl chloride with alcoholic ammonia under pressure. It is a strong base and will displace ammonia from ammonium salts. Forms a crystalline hydrochloride and also crystalline compounds with various metallic chlorides. 

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