四氯吡嗪 、 monomethyl-amino-ethanol 、 三乙胺 25.0 ℃
、889.26 Pa
条件下,
反应 16.0h,
以10 g (78% of theoretical yield) of a yellow oil (b.p. 110° at 0.05 mm Hg)的产率得到2-[methyl-(3,5,6-trichloro-pyrazin-2-yl)-amino]-ethanol
Dichloropyrazino-oxazines of the formula ##STR1## wherein R is H or a C.sub.1 to C.sub.8 alkyl, alkenyl, cycloalkyl or cycloalkenyl radical, are disclosed. The compound in which R is H has utility as an intermediate for the compounds in which R is other than H. The latter compounds exhibit microbicidal, herbicidal or insecticidal activity. The compounds of the invention are readily prepared from tetrachloropyrazine and 2-aminoethanols of the formula R--NH--CH.sub.2 CH.sub.2 --OH.