作者:Emily C. Paré、David J. R. Brook、Aaron Brieger、Mick Badik、Marie Schinke
DOI:10.1039/b510075e
日期:——
1,5-Diisopropyl-6-oxo-verdazyl free radicals were synthesized via the condensation of BOC protected isopropyl hydrazine with phosgene, deprotection with aqueous HCl, condensation with aldehydes to form tetrazanes and finally oxidation to give the free radicals. The introduction of isopropyl groups results in free radicals that show greater solubility in a variety of solvents and are more stable than their methyl substituted counterparts. ESR shows reduced hyperfine coupling to the isopropyl methine hydrogens consistent with this hydrogen being in the plane of the verdazyl ring.
1,5-二异丙基-6-氧代-verdazyl 自由基是通过 BOC 保护的异丙基肼与光气缩合、用盐酸水溶液脱保护、与醛缩合形成四氮烷,最后氧化生成自由基而合成的。引入异丙基后,自由基在各种溶剂中的溶解度更高,比甲基取代的自由基更稳定。ESR 显示异丙基甲基氢的高频耦合降低,这与该氢位于verdazyl 环平面上的情况一致。