Department of Chemistry, University of Nebraska, Lincoln, Nebraska 68588-0304, USA.
Org Lett. 2012 Oct 19;14(20):5322-5. doi: 10.1021/ol302506f. Epub 2012 Oct 10.
A series of sterically shielded pyrrolidine nitroxides were synthesized, and their reduction by ascorbate (vitamin C) indicate that nitroxide 3, a tetraethyl derivative of 3-carboxy-PROXYL, is reduced at the slowest rate among known nitroxides, i.e., at a 60-fold slower rate than that for 3-carboxy-PROXYL.
合成了一系列空间位阻保护的吡咯烷氮氧自由基,并通过抗坏血酸(维生素 C)还原实验表明,3-羧基-PROXYL 的四乙基衍生物 3 是所有已知氮氧自由基中还原最慢的,即比 3-羧基-PROXYL 慢 60 倍。