Novel 1,3-oxazin-4-one derivatives of the formula ##STR1## wherein R.sup.1 to R.sup.5 are hydrocarbyl radicals which are optionally substituted, and herbicidal compositions comprising the same as active ingredients and their use in controlling the growth of weeds. The compounds can be produced by reacting substituted 1,3-dioxin-4-one derivatives and N-methylene-alkylamine.
Novel 1,3-oxazin-4-one derivatives of the formula ##STR1## wherein R.sup.1 to R.sup.5 are hydrocarbyl radicals which are optionally substituted, and herbicidal compositions comprising the same as active ingredients and their use in controlling the growth of weeds. The compounds can be produced by reacting substituted 1,3-dioxin-4-one derivatives and N-methylene-alkylamine.