The Meisenheimer rearrangement of amine N-oxides to substituted hydroxylamines invariably favors the N-+ 0 1, 2 shift2 In sharp contrast with this are the generally preferred thermal 0-+ S 1, 2 shifts of the sulfoxylate+~ ulfinate,~ sulfinate+~ ulfone,~ and sulfenate+ sulfoxide5 rearrangements, as well as the thermal 0+ P 1, 2 shift in the phosphinite+ phosphine oxide rearrangement. 6
