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Specifically, the reaction sequence involves the novel 1,3\u2010addition of trimethylsilyl phosphites (e.g. diethyl) or trimethylsilyl phosphines (e.g. diphenyl) to aldo\u2010nitrones [e.g. \u03b1\u2010phenyl\u2010N\u2010<jats:italic>tert<\/jats:italic>\u2010butylnitrone (PBN) or 5,5\u2010dimethyl\u2010l\u2010pyrroline\u2010N\u2010oxide (DMPO)] or keto\u2010nitrones [e.g. 2\u2010ethyl\u20105,5\u2010dimethyl\u20101 pyrroline\u2010N\u2010oxide (2\u2010Et\u2010DMPO) or 2\u2010phenyl\u20105,5\u2010dimethyl\u2010l\u2010pyrroline\u2010N\u2010oxide (2\u2010Ph\u2010DMPO)] to form \u03b1\u2010phosphityl\u2010 or \u03b1\u2010phosphinyl\u2010O\u2010silylhydroxylamines. Acidic hydrolysis provides the corresponding hydroxylamines that are easily oxidized to the title \u03b2\u2010phosphorus\u2010nitroxides. ESR spectroscopic analysis revealed some very large \u03b2\u2010phosphorus hyperfine splittings (i.e. in excess of 5 mT). For this reason and their remarkable stability (persistence) some of these nitroxides show promise as integral components in new, improved weak\u2010field dynamic nuclear polarization (DNP) magnetometers. Copyright \u00a9 2004 John Wiley &amp; Sons, Ltd.<\/jats:p>","DOI":"10.1002\/mrc.1436","type":"journal-article","created":{"date-parts":[[2004,8,10]],"date-time":"2004-08-10T08:00:21Z","timestamp":1092124821000},"page":"835-843","source":"Crossref","is-referenced-by-count":5,"title":["Electron spin resonance study of phosphorus\u2010nitroxides from 1,3\u2010additions of silicon\u2010phosphorus reagents to nitrones"],"prefix":"10.1002","volume":"42","author":[{"given":"D. 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