| 摘要 |
PROBLEM TO BE SOLVED: To solve the following problem that a 1-nitrocarbazole in which a nitro group is substituted only at the 1-position of a carbazole ring cannot be obtained at a high yield since other isomers are mixed therein.SOLUTION: 1.18 g of 3,6-dichlorocarbazole is dissolved in a mixed solvent of 15 ml of 1,4-dioxane and 15 ml of acetic acid. While stirring this solution, 0.69 g of sodium nitrite is added in small increments. Once the sodium nitrite is added, the solution becomes a pale yellow suspension. Thereafter a residue of the solution is filtered and identified. As a result, the residue is found to be the 1-nitro-3,6-dichlorocarbazole of the following compound, and the yield is 98%. |
