Di-tert-alkyl Nitroxyl Radicals. Synthesis, Physical Properties and Applications as Inhibitors of Vinyl Polmerization at Elevated Temperatures
作者:George Sosnovsky、Mikolaj Jawdosiuk、J. Michael Clumpner
DOI:10.1515/znb-2000-0118
日期:2000.1.1
visible and electron paramagnetic resonance spectra of 4a-c were recorded. The radicals were explored as potential inhibitors of unwanted alkene polymerization reactions at elevated temperatures, in comparison with the aliphatic di-tert-butyl nitroxyl (1), the alicyclic nitroxyl radicals 2,2,6,6-tetramethylpiperidin-1-oxyl (2) and 4-hydroxy-2,2,6,6-tetramethyl-piperidin- 1-oxyl (3), some commercial
稳定的二叔烷基硝酰基、叔丁基-叔戊基硝酰基 (4a)、二叔戊基硝酰基 (4b) 和叔辛基-叔戊基硝酰基 (4c),二叔丁基硝酰基 (1) 的同系物, 由叔烷基胺 7a-c 通过 3-叔烷基氨基-3-甲基-1-丁炔 8a-c 合成。8a,b 与过氧化氢的氧化导致相对不稳定的 N-叔-烷基-N -(1,1-二甲基丙-2-炔基)硝酰基自由基 15a,b。记录了4a-c的热稳定性、蒸气压数据、紫外、可见光和电子顺磁共振谱。与脂肪族二叔丁基硝酰基 (1)、脂环族硝酰基自由基 2,2,6,6-四甲基哌啶-1-氧基 (2 ) 和 4-羟基-2,2,6,