Clonidine → 2-[N-(2,6-dichlorophenyl)-N-(2-methyl-1-butene-4-yl)-amino]2-imidazoline

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A mixture of 6.9 gm (0.03 mol) of clonidine, 5.6 gm of 4-bromo-2-methyl-1-butene, and 5 ml of triethylamine in 25 ml of toluene was heated for 24 hours at 120° C. After cooling, the solvent was decanted, and the residue remaining was dissolved in 1 N hydrochloric acid. After extraction with ether several times (the ethereal extracts were abandoned), the solution was extracted with ether in fractions at stepwisely rising pH values (alkalizing with 2 N sodium hydroxide solution). The thin-layer chromatographically uniform ether extracts were united and dried over MgSO4, and the ether was evaporated in vacuo.

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