54 Journal of the Mitchell Society \_Odoher 



doubtedly dyes, but their dyeing properties have not yet been studied. 

 ]^o dyes so far described in the literature or patented belong to this 

 series of naphthalene compounds, hence they constitute a new group. 

 An application for letters patent has been made to cover this new 

 class and the patent will undoubtedly soon be allowed. 



THE NEW HALOGEN JUGLONES. 



A brief description of these new halogen derivatives of juglone 

 follows. Juglone dichloride,B, lemon yellow plates, recrystallized 

 from ligroin, melts at 159-160°. Monochlorojiiglone,C, yellowish 

 brown needles, purified by carbon tetrachloride, melts at 166°, but 

 gives off a violet vapor above 130°. Acetyl monochlorojuglone,D, 

 brownish yellow plates, recrystallized from alcohol, melts at 147°. 

 Dichlorojuglone,E, lustrous golden brown needles, recrystallized from 

 alcohol, melts at 149°. Acetyl dichlorojuglone,r, yellow plates, re- 

 crystallized from alcohol, melts at 154°. Juglone dibromide,G, yel- 

 low prisms with pointed ends, recrystallized from ligroin, melts at 

 109°. Monobromojuglone,H, translucent yellowish brown plates, 

 recrystallized from acetone, melts at 166°. Acetyl monobromo jug- 

 lone,!, golden brown plates, recrystallized from alcohol, melts at 148°. 

 Tribromojuglone,J, rich red needles, recrystallized from a mixture 

 of chloroform and ligroin, melts at 170°. Acetyl derivative,K, silky 

 yellow needles recrystallized from alcohol, melts at 186°. Mono- 

 chlorodibromojuglone,M, golden bronze plates, recrystallized from 

 alcohol, melts at 152°. Dihydroxydibromo juglone,^, golden brown 

 prismatic needles, recrystallized from alcohol, melts at 236°. The 

 sodium salt,L, is an indigo blue powder. 



Chapel Hill, N. C. 



