| 摘要 |
1,211,584. Salicylaldehyde; tri-(o - dichloromethyl phenyl) phosphate. GEIGY (U.K.) Ltd. 16 May, 1969 [16 May, 1968], No. 23354/68. Heading C2C. Salicylaldehyde is produced by the acid hydrolysis of tri-(o-dichloromethyl phenyl) phosphate in the presence of the sodium salt of the condensation product of naphthalene sulphonic acid and formaldehyde as surface-active agent. The surface-active agent may be obtained by neutralising with a sodium-containing compound the condensation product of 1 molar proportion of naphthalene sulphonic acid and 0À77 molar proportion of formaldehyde at 80-100‹ C. The acid used in the hydrolysis step may be, e.g. sulphamic acid, p-toluenesulphonic acid, acetic acid, phosphonic acid, hydrochloric acid or, preferably, sulphuric acid. The tri-(o-dichloromethyl phenyl) phosphate used may be made by the chlorination of tri-o-tolyl phosphate with gaseous chlorine at 120-180‹ C., optionally in the presence of ultra-violet light. |
