反应详情

A mixture of isomers of 2-methyl-11,12-dihydroxy-9,10-ethano-anthracene weighing 2.1 g. is dissolved in 45 ml. of glacial acetic acid and is treated at room temperature with 7.45 g. of lead tetraacetate until a starch-iodide test is positive. After 2-3 hours at room temperature followed by cooling there is deposited orange crystals, which are collected by filtration and recrystallized from methylene chloride-methanol giving 1.1 g. of orange crystals melting at 162°-164° C.

1. dissolutionis dissolved in 45 ml
2. temperatureby cooling there
3. filtrationare collected by filtration
4. customrecrystallized from methylene chloride-methanol giving 1.1 g