The electron resonance spectra of I and II in their ionized forms are similar to that of bis(2,2,6,6-tetramethylpiperidin-4-ol) glutarate (IV) at 23°( Figure 1). In the un-ionized forms the widths of the second and fourth lines have decreased and the spectra resemble that of IV at 46°. The observation of five equally spaced spectral lines shows that the spin exchange, J, is much greater than the nitrogen coupling constant, a,
Diphenylcarbene reacts with olefins by both addition and abstraction. The partitioning of the reaction between these paths is determined largely by steric factors. The stereochemistry of addition has been determined in a system favorable to triplet reaction. With acetylenes, both addition and abstraction occur, but the intermediate generated by addition is often diverted from a path leading to the usual cyclopropene and gives indene instead.
bei diesen Temperaturen der Oxiranring des Radikals ( 1 ) offnet. Die analoge Ringoffnung von (3) unter Bildung des Formylmethyl-Radikals ist bei vergleichbaren Bedingungen nicht zu beobachten15'. Eingegangen am 28. August I973 [Z 9091 [I] A.
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