ESTERIFICATION ON ZEOLITES

Primary, secondary, and tertiary alcohols and polyols were esterified with carboxylic acidin the presence of HY zeolite. Yield of ester of primary alcohol is over 80 per cent, andthat of sec- and tert-alcohols, 40-50 per cent generally.γ-Lactone was synthesized byrearrangement of α- or β-octylenic to tridecylenic acid with HY zeolite.     

4-氯-2,6-二(羟甲基)苯酚(试铁酚)的合成及其在测定铁中的应用

对氯苯酚与多聚甲醛在氢氧化钠存在下70℃反应3小时,即得粗产率98%的4-氯-2,6-二(羟甲基)苯酚(试铁酚).实验表明铁(Ⅲ)-试铁酚在pH6.4时,可生成稳定的橙红色络合物,吸收峰在480nm处,摩尔吸收系数为6.4×10³可用于铁(Ⅲ)的定量测定.本法的优点是选择性较高,测定范围广,方法简便、迅速,可用于土壤、岩石等样品中铁的直接测定.本法与其它方法测得的结果一致.