with two-equiv. of aqueous titanium trichloride add to the carbonyl carbon atom of simple ketones (acetone, cyclopentanone, cyclohexanone) and aldehydes (acetaldehyde, propionaldehyde, benzaldehyde) affording subatituted pyridylglycols in very good yields. The present one-pot method has considerable advantage over the existing procedure. The reaction is discussed in terms of a radical mechanism in which
当使其与二当量反应时,则为2-和4-乙酰基
吡啶,以及2-和4-
吡啶醛。将
三氯化钛水溶液加到简单的酮(
丙酮,
环戊酮,
环己酮)和醛(
乙醛,
丙醛,
苯甲醛)的羰基碳原子上,以非常好的收率得到取代的
吡啶基二醇。与现有方法相比,本一锅法具有相当大的优势。根据自由基机理讨论了该反应,其中Ti(III)物种起着基本作用。