中文名称 | 英文名称 | CAS号 | 化学式 | 分子量 |
---|---|---|---|---|
—— | 2-bromo-5-hydroxy-[1,4]naphthoquinone | 69008-03-3 | C10H5BrO3 | 253.052 |
—— | 3-Bromojuglone | 52431-65-9 | C10H5BrO3 | 253.052 |
6-溴-5-羟基-1,4-萘醌 | 6-bromo-5-hydroxynaphthalene-1,4-dione | 94032-64-1 | C10H5BrO3 | 253.052 |
5-羟基对萘醌 | 5-hydroxynaphtho-1,4-quinone | 481-39-0 | C10H6O3 | 174.156 |
The reaction of dimethylamine with 5-methoxy-1,4-naphthoquinone gives approximately equal amounts of the two possible substitution products and with 6-methyl-1,4-naphthoquinone followed by acid hydrolysis 2-hydroxy-6-methyl-l,4-naphtho-quinone is the principal product. Similar treatment of 5-methyl-1,4-naphthoquinone gives mostly 3-hydroxy-5-methyl-l,4-naphtlioquinone. The isomer, 2-hydroxy-5- methyl-1,4-naphthoquinone, has been prepared by another method. The product of Thiele-Winter addition of acetic anhydride to juglone is shown to be a mixture of the two possible isomers, but authentic 1,3,4,5-tetra-acetoxynaphthalene has been prepared from 3,5-dihydroxy-1,4-naphthoquinone. The reaction of acetic anhydride with plumbagin gives three compounds, the composition of the mixture depending on the time of contact. Juglone and plumbagin have been selectively brominated in the 6-position and certain other halogen derivatives of these quinones have been prepared. The preparation of 3-chloro-5-hydroxy-2-methyl-1,4-naphthoquinone provides a new route by which droserone may be obtained from plumbagin.