反应详情

温度

15 °C

To 102.4 g. of 2,3,4-pentanetrione 3-(phenylhydrazone) dissolved in 250 ml. of chloroform and cooled to about 15° C., 100 ml. of tert. butyl hypochlorite is added. The temperature rises to 25° C. and is allowed to cool to 15° C. before the next addition of 60 ml. (0.5 mole). No starting material remains and the solvent of the reaction mixture is evaporated to give a gum, which is dissolved in 250 ml. of methanol and then heated to about 40° C. The temperature of the solution varies from about 40° to about 60° C. for about 15 minutes, and is then cooled to about 0° C., and the precipitate filtered off and washed with cold methanol. The weight of the precipitate that melts at 134° to 136° C. is 71.3 g. (73% yield). A 10 g. portion of this compound is recrystallized from equal parts of ethyl acetate and Skellysolve B (hexanes) to give pure pyruvoyl chloride 1-(phenylhydrazone) melting at 135 to 137° C.

1. customrises to 25° C.
2. customNo starting material remains and the solvent of the reaction mixture is evaporated
3. customto give a gum, which
4. dissolutionis dissolved in 250 ml
5. temperatureis then cooled to about 0° C.
6. filtrationthe precipitate filtered off
7. washwashed with cold methanol
8. customportion of this compound is recrystallized from equal parts of ethyl acetate and Skellysolve B (hexanes)