The mixture of triphenylphosphine (PPh3) and 2,3-dichloro-5,6-dicyanobenzquinone (DDQ) as a neutral system has been used for the preparation of various types of diethyl α-bromo, α-iodo and α-azidophosphonates from their corresponding diethyl α-hydroxyphosphonates in the presence of n-Bu4NBr, n-Bu4NI and NaN3 in good to high yields.
三苯膦(PPh 3)和2,3-二
氯-5,6-二
氰基苯并醌(
DDQ)的混合物已用作中性体系,用于从中制备各种类型的
二乙基α-
溴,α-
碘和α-
叠氮膦酸酯在n -Bu 4 NBr,n -Bu 4 NI和NaN 3的存在下,它们相应的α-羟基
膦酸二乙酯的产率高到高。