Foul odours

Isocyanide reaction. Add a few drops of chloroform to about 0 2 g. of the substance, and then 2 3 ml. of ethanolic NaOH solution. Mix well and warm gently the foul odour of isocyanide (carbylamine) is produced. Immediately the odour of isocyanide is detected, cool the tube and add carefully an excess of cone. HCl the isocyanide is thus hydrolysed to the odourless amine. 

Isocyanide reaction. Repeat Test i for chloroform (above) using 0 5 g. of iodoform instead of i ml. of chloroform the foul odour of isocyanide is produced as before. 

Purified by distn in a vacuum. Distn at atmospheric pressure causes some oxidation and should be done in an inert atmosphere. [Woodward J Chem Soc 1892 1948.] It has a foul odour, is irritating to the eyes, nose and skin — should be handled in an efficient fume cupboard. It is miscible with H2O, EtOH, Et20 and and has a UV max at 235nm. The 2,4-dinitrophenyl thioether has m 101-102°(from... 

Triethylphosphine [554-70-1] M 118.2, b 100"/7mm, 127-128"/744mm, (I4 0.812, n D 1.457, pK 8.69 (also available as a l.OM sola in THF). All operations should be carried out in an efficient fume cupboard because it is flammable, toxic and has a foul odour. Purified by fractional distn at atm pressure in a stream of dry N2, as it is oxidised by air to the oxide. In 300% excess of CS2 it forms Et3PCS2 (m 118-120" cryst from MeOH) which decomposes in CCI4 to give Et3PS as a white solid m 94" when recryst from EtOH. [Sorettas and Isbell 7 Org Chem 27 273 1962 J Am Chem Soc S2 5791 I960, pK Henderson and Streuli 7 Am Chem Soc S2 5791 I960, see also trimethylphosphine.] Store in a sealed vial under N2. 

Allyl-propyl disulphide, (C3H5)S. S. (C3H7), exists to the extent of about 5 per cent, in garlic oil. It is a bright yellow oil of foul odour, having a specific gravity 1-023 and boiling at 66° to 69° at 16 mm. pressure. 

A mixture of 2-bromobenzylamine (12.5 g) and S-methylthiouronium sulfate (10 g) in water (20 ml) was heated for 1.5 hours on a steam bath in a hood, during which methylmercaptan escaped (as evidenced by a foul odour). The reaction mixture was then cooled and diluted with ethanol (100 ml). A colourless solid of 2-bromobenzylguanidine sulfate was separeted, and washed with ethanol. This solid melted at 230-232°C it was recrystallized from water and then melted at 247-248°C. By action of a basic agent the salt obtained may be converted into free base. 

Dry tests a. Selenium compounds mixed with sodium carbonate and heated upon charcoal odour of rotten horseradish. A foul odour, due to hydrogen selenide, H2Se, is obtained upon moistening the residue with a few drops of dilute hydrochloric acid. A black stain (due to Ag2Se) is produced when the moistened residue is placed in contact with a silver coin. 

When the spirit of darkness and of foul odour is rejected, so that no stench and no shadow of darkness appear, then the body is clothed with light and the soul and spirit rejoice because darkness has fled from the body. And the soul, calling to the body, that has been filled with light, says Awaken from Hades Arise from the tomb and rouse thyself from darkness For thou hast clothed thyself with spirituality and divinity, since the voice of the resurrection has sounded and the medicine of life has entered into thee. ... 

E4.30 The foul odour of damp AI2S3 suggests that a volatile compound is formed when this compound comes in contact with water. The only volatile species that could be present, other than odourless water, is HjS, which has the characteristic odour of rotten eggs. Thus, an equilibrium is established between two hard acids, AI(III) and H, and the bases 0 and S " ... 

Dissolve the thiol in aqueous 20% NaOH, extract it with a small amount of benzene and then steam distil until clear. After cooling, the alkaline solution is acidified slightly with 15% H2SO4 and the thiol is distilled off, dried with CaS04, CaCl2 or 4A molecular sieves, and fractionally distilled under nitrogen [Elhs Reid J Am Chem Soc 54 1674 1932]. It has a foul odour. [Beilstein 1IV 1390.]... 

M 284.4, m 160 . It crystallises from CgH6 in yellow plates or from hot trichlorobenzene. The low melting point reported in the literature (112° with gradual softening at 68-102°) has been attributed to the presence of elemental sulfur in the crystals. It has a foul odour and is a suspected carcinogen. [Yousif et al. Tetrahedron 40 2663 1984, Scott et al. J Org Chem 22 789 7957.]... 

Air pollution problems associated with hydrogen sulphide gas and the general population are associated with the foul odour. Sources can be industrial or polluted water. Peak concentrations as high a 0.13 ppm have been reported in the air surrounding industrial sources. At a geothermal site in New Zealand where continuous monitoring was carried out, a concentration of 0.05 ppm was exceeded for 35% of the time over a five-month period. 

Appearance at 298 K Volatile liquid, foul odour White needle-like crystals White powder or crystals Golden-yellow crystals... 

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