反应详情

Re 1: A very large excess of hydrochloric acid (96 times the molar quantity) is required, and a very high salt load results due to the addition of 7.4 times the molar quantity of magnesium chloride. Furthermore, the prescribed temperature/time control during the addition of hydrogen peroxide cannot be maintained because of the high heat of reaction. A repeat of this process using only 30 times the molar quantity of hydrochloric acid, 3 times the molar quantity of magnesium chloride and more suitable temperature control gave a qualitatively poor chloranil (melting point 215°-220° C., yield 95% of theory) with trichloro-1,4-benzoquinone and tetrachlorohydroquinone as impurities.

1. temperaturecannot be maintained because of the
2. temperaturehigh heat of reaction