Stable esters and amides of 2,2,6,6-tetramethyl-l-oxyl-4-piperidine with carboxylic acids

Intramolecular Mobility in Nitroxide Biradicals with Flexible Linkers

“…Biradicals (CH 2 ) 8 [COOCH 2 CH 2 R 6 ] 2 (B1) and (CH 2 ) 8 [CONHR 6 ] 2 (B2) in which R 6 is 1-oxyl-2,2,6,6-tetramethylpiperidine residue, used in this work, were synthesized as described in [2,3,28] and their colors and melting points were in good correlation with the published ones.…”

“…Stable nitroxide biradicals represent a large class of such compounds that can be formally divided by several groups, e.g., chemically rigid, short-chain flexible, long-chain flexible, etc. A lot of articles describing electron spin exchange phenomena observed by EPR (electron paramagnetic resonance) spectroscopy were published during the last 50 years [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15] and in references therein. Despite such huge number of publications which have analyzed the effect of chemical nature, the length of the spacer, temperature, solvent polarity, and viscosity, etc., the papers regarding this item are still appeared in the literature (see, e.g., [16][17][18][19][20] in which influence of high pressure [17], specific solvation in room temperature ionic liquids [19] or the structure of the nitroxide radicals [20] on the dynamics of the intramolecular motions were examined.…”

Reactions of nitroxides 15. Cinnamates bearing a nitroxyl moiety synthesized using a Mizoroki–Heck cross-coupling reaction

“…4-Acryloyloxy-2,2,6,6-tetramethylpiperidine-1-oxyl ( 3 ) was obtained in 90–95% yield by the reaction of acryloyl chloride ( 2 ) with 2,2,6,6-tetramethyl-4-piperidinol-1-oxyl ( 1 ) in the presence of triethylamine [ 21 , 34 – 36 ].…”