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paradichlorobenzene
paradichlorobenzene n. 
/ˌparədʌɪˌklɒrə(ʊ)ˈbɛnziːn/, /ˌparədʌɪˌklɔːrə(ʊ)bɛnˈziːn/, /ˌparədʌɪˌklɒrə(ʊ)bɛnˈziːn/, /ˌpɛrəˌdaɪˌklɔroʊˌbɛnˈzin/, /ˌpɛrəˌdaɪˌklɔrəˈbɛnˌzin/, /ˌpɛrəˌdaɪˌklɔrəˌbɛnˈzin/ (also paradichlorbenzene) a volatile crystalline compound, C6H4Cl2, which has a penetrating odour and is used as a deodorizer and insecticidal fumigant, esp. in mothballs.
Brit. /ˌparədʌɪˌklɔːrə(ʊ)ˈbɛnziːn/
, /ˌparədʌɪˌklɔːrə(ʊ)ˈbɛnziːn//ˌparədʌɪˌklɒrə(ʊ)ˈbɛnziːn//ˌparədʌɪˌklɔːrə(ʊ)bɛnˈziːn//ˌparədʌɪˌklɒrə(ʊ)bɛnˈziːn/U.S. /ˌpɛrəˌdaɪˌklɔroʊˈbɛnˌzin/
, /ˌpɛrəˌdaɪˌklɔroʊˈbɛnˌzin//ˌpɛrəˌdaɪˌklɔroʊˌbɛnˈzin//ˌpɛrəˌdaɪˌklɔrəˈbɛnˌzin//ˌpɛrəˌdaɪˌklɔrəˌbɛnˈzin/ΘΚΠ
the world > matter > chemistry > organic chemistry > hydrocarbons > [noun] > benzene derivatives > other benzene derivatives
iodoxybenzene1865
retene1866
trimethylbenzene1868
quinol1871
paradichlorobenzene1876
coumarone1883
thiophene1883
antipyrin1884
thiotoluene1885
thioxylene1885
phthalaldehyde1886
trimesic acid1889
iodosobenzene1892
benzodiazepine1934
1876 Jrnl. Chem. Soc. 29 81 By heating equal molecules of chlorobenzenesulphonic chloride and phosphorus pentachloride to 200°–220°, paradichlorobenzene, melting at 53°, and boiling at 172°–174°, is formed.
1931 K. M. Smith Textbk. Agric. Entomol. viii. 97 Paradichlor-benzene is also worth trying; apply in holes about 1 foot apart, 1 gramme to each hole.
1965 C. Zigrosser & C. M. Gaehde Guide to Collecting Orig. Prints vii. 113 Preventative measures [against microbiological infection of prints]..can be taken by placing open containers of paradichlorobenzene crystals upon the storage shelves.
2001 Org. Style Nov. 83/1 Don't rely on mothballs, which contain paradichlorobenzene or naphthalene in concentrations high enough to be toxic to humans.
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