Photochemistry. VI. Photo-induced Methylation of Pyridazines
Irradiation of Pyridazine (Ia) in methanol containing 5% HC1, afforded 4-methylated and 4, 5-dimethylated compounds. 3-Methylpyridazine (Ib) gave 4-methylated compound, along with 5-methylated and 4, 5-dimethylated compounds. 3-Methoxypyridazine (Ic) afforded 4-methylated and 4, 6-dimethylated compo...
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Published in | Chemical & pharmaceutical bulletin Vol. 20; no. 2; pp. 273 - 276 |
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Main Authors | , , |
Format | Journal Article |
Language | English |
Published |
Tokyo
The Pharmaceutical Society of Japan
1972
Japan Science and Technology Agency |
Online Access | Get full text |
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Summary: | Irradiation of Pyridazine (Ia) in methanol containing 5% HC1, afforded 4-methylated and 4, 5-dimethylated compounds. 3-Methylpyridazine (Ib) gave 4-methylated compound, along with 5-methylated and 4, 5-dimethylated compounds. 3-Methoxypyridazine (Ic) afforded 4-methylated and 4, 6-dimethylated compounds. 3, 6-Dimethylpyridazine (Ie) gave 4-methylated and 4, 5-dimethylated compounds. 3-Methoxy-6-methylpyridazine (If) gave 4-methylated compound as a sole product. 3-Methyl-6-chloropyridazine (Ig), 3, 6-dichloropyridazine (Ih), and 3-phenyl-6-chloropyridazine (Ii) afforded 5-methylated and 4, 5-dimethylated compounds, respectively. 3-Chloropyridazine (Id) did not give monomethylated, but 4, 5-dimethylated compound in a low yield. of 1-2%, presumably due to the unstability and the decomposition of the starting material. |
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ISSN: | 0009-2363 1347-5223 |
DOI: | 10.1248/cpb.20.273 |