917-95-3Relevant articles and documents
Nitrone Directing Groups in Rhodium(III)-Catalyzed C?H Activation of Arenes: 1,3-Dipoles versus Traceless Directing Groups
Xie, Fang,Yu, Songjie,Qi, Zisong,Li, Xingwei
supporting information, p. 15351 - 15355 (2016/12/06)
Functionalizable directing groups (DGs) are highly desirable in C?H activation chemistry. The nitrone DGs are explored in rhodium(III)-catalyzed C?H activation of arenes and couplings with cyclopropenones. N-tert-butyl nitrones bearing a small ortho subst
Spin adducts from the reaction between N-phenyl-α-tert-butylnitrone (PBN) and activated olefins. A facile pathway converting PBN into 2-methyl-2-nitrosopropane (MNP)
Eberson, Lennart,Persson, Ola
, p. 1081 - 1095 (2007/10/03)
N-Phenyl-α-tert-butylnitrone (PBN) reacts with activated olefins RCH=CHR, such as maleimides, maleic anhydride or diethyl maleate, with formation of two types of persistent spin adducts giving characteristic EPR spectra, denoted types A and B. Spin adducts with type A spectrum were formed photochemically and identified as reductive coupling products between the olefin and PBN, RCH2CH(R)-PBN.. Spin adducts with type B spectra were formed photochemically and/or thermally and were identified as reductive coupling products RCH2CH(R)-N(O.)But between the olefin and a degradation product of PBN, 2-methyl-2-nitrosopropane (MNP, t-BuNO). The conversion of PBN to t-BuNO was studied for a compound with an exceedingly reactive nitrogen-nitrogen double-bond, namely 4-phenyl-4H-1,2,4-triazoline-3,5-dione (PTAD). In this case, a 74% yield of t-BuNO was obtained in a short period of time; α,N-diphenylnitrone reacted similarly to give nitrosobenzene. The reaction between PBN and an activated olefin was assumed to occur analogously, either via the initial formation of a 1,3-dipolar cycloadduct or some parallel reaction involving attack of the electrophilic olefin at the PBN α-carbon. The 1,3-dipolar cycloadduct between PBN and N-phenylmaleimide exhibited favourable initiator properties for living polymerization of styrene. A new type of spin adduct, RCH(But)CH(R)-N(O.)But, was prepared by the photochemical reaction between an activated olefin and t-BuNO. This reaction presumably proceeds by photocleavage of t-BuNO to NO and t-Bu., the latter reacting with the activated olefin to give a transient radical, RCH(But)CH.(R), which is trapped by t-BuNO. Acta Chemica Scandinavica 1998.
Action d'un Tetrafluoroborate d'Oxaziridinium sur les Amines et les Imines
Hanquet, Gilles,Lusinchi, Xavier
, p. 12185 - 12200 (2007/10/02)
The Oxaziridinium salt 1 derived from dihydroisoquinolin is an oxygen transfer reagent to primary amines leading to nitrosoderivatives (if R = Alkyl) or nitro compounds (if R = Aryl), to tertiary amines leading to N-oxides, and to secondary amines and imines leading to the corresponding nitrone.