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Purification of Laboratory Chemicals, 8th Edition by W.L.F. Armarego

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3-(4-Chlorophenyl)-1,1-dimethylurea (Monuron, CMU) [150-68-5] C9H11ClN2O, M 198.7, m 171°, 170.5-171.5° (176-177° also reported). Crystallise monuron from MeOH. The pH of a saturated solution in H2O is ca 6.3, and it forms a more soluble trichloroacetate salt (Urox), C9H11ClN2O.C2HCl3O2, m 78-81°, which is an effective herbicide against monocotyledonous plants. [Beilstein 12 IV 1191.]

4-Chloro-1,2-phenylenediamine [95-83-0] C6H7ClN2, M 142.6, m 69-70°, 73°, pK125 -0.27 (aqueous H2SO4), pK225 3.35 (3.67). Recrystallise the diamine from petroleum ether. [Beilstein 13 IV 68.]

4-Chlorophenyl isocyanate [104-12-1] C7H4ClNO, M 153.6, m 26°, 28-31°, 31-32°, 32°, 32.5°, b 80.6-80.9°/9.5mm, 115-117°/45mm, d25 1.20, nD20 1.5618. Purify the isocyanate ...

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