Phosphorylformonitrile oxides as spin traps for carbon-centered free radicals: co-formation with radicals in the generation of nitrile oxides from C-phosphorylformohydroximoyl halides in the presence of alcohols or ethers
作者:V. I. Morozov、B. I. Buzykin、A. V. Il’yasov
DOI:10.1007/s11172-005-0257-9
日期:2005.2
(R1 = R2 = H) are used, acyl radicals generated at the initial step of the reaction are also trapped by nitrile oxides to give C-acyl-C phosphoryl iminoxyl radicals R2P(O)C(=NO·)C(=O)R3. Hyperfine coupling constants for more than 20 C-phosphoryl-iminoxyls existing in solutions as mixtures of Z- and E-isomers were determined.The effect of the structure of the primary radical (length of the carbon chain
肟 R2P(=O)C(=NOH)X(X = Cl 或 Br)的单电子氧化生成腈氧化物 R2P(=O)C+=NO−,作为不稳定的碳中心自由基的自旋陷阱后者是在生成氧化腈期间释放的原子氯(溴)作用下,将 PbO2 添加到甲羟肟酰卤与醇或通式为 R1OCHR2R3 的醚的混合物中时生成的。这产生了新的、更持久的 C 磷酸亚氨基氧基 R2P(=O)C(=NO·)C(OR1)R2R3 (R1, R2, R3 = H, Alk)。当使用伯醇 (R1 = R2 = H) 时,反应初始阶段产生的酰基自由基也被腈氧化物捕获,得到 C-酰基-C 磷酰基亚胺氧基自由基 R2P(O)C(=NO·)C (=O)R3。