作者:Kevin A. Hylands、Roy B. Moodie
DOI:10.1039/a607257g
日期:——
The reactions of 3-phenyloxetane 1, 3-(4-nitrophenyl)oxetane 5 and
3,3-pentamethyleneoxetane 7 with nitric acid in dichloromethane or
trichloromethane under anhydrous conditions have been investigated.
Quantitative conversion to 2-substituted propane-1,3-diol dinitrates
occurs. Compound 1 reacts initially by a mixture of
ortho- and para-aromatic nitration
and oxetane ring-opening. Aromatic nitrations of 1 and
1,4-dichlorobenzene, the former reacting through its majority
hydrogen-bonded complexed form, are approximately sixth order in nitric
acid and proceed at a comparable rate. The oxetane ring-opening
reactions are approximately second order in nitric acid except in the
case of 3-(2-nitrophenyl)oxetane 3, where there is evidence of
intramolecular catalysis by the nitro group.
在无水条件下,3-苯基环氧乙烷1、3-(4-硝基苯基)环氧乙烷5和3,3-戊二烯基环氧乙烷7与硝酸在二氯甲烷或三氯甲烷中的反应已被研究。它们均完全转化为2-取代丙烷-1,3-二硝酸酯。化合物1的反应首先是通过苯环邻位和对位的硝化和环氧环的开环。1和1,4-二氯苯的苯环硝化反应,前者通过其主要氢键络合形式进行,硝酸浓度对反应速率的依赖约为六级,且反应速率相近。环氧环开环反应对硝酸的依赖约为二级,除了3-(2-硝基苯基)环氧乙烷3,其硝基基团显示出分子内催化作用的证据。