Photoinduced Remote C(sp3)−H Phosphonylation of Amides
摘要:
The present study reports an unprecedented protocol for the phosphonylation of unactivated C(sp3)−H bonds. By utilizing 1 mol % 4DPAIPN (1,2,3,5‐tetrakis(diphenylamino)‐4,6‐dicyanobenzene) as the catalyst, satisfactory yields of γ‐phosphonylated amides are obtained through a visible‐light‐induced reaction between N‐((4‐cyanobenzoyl)oxy)alkanamides and 9‐fluorenyl o‐phenylene phosphite at room temperature. This protocol demonstrates broad substrate scope and wide functional group compatibility.
Acyl nitroxides. Part 4. Estimation of OH bond dissociation energies for N-t-butylhydroxamic acids
作者:Terence C. Jenkins、M. John Perkins
DOI:10.1039/p29830000717
日期:——
constants for the hydrogen exchange reactions between N-t-butylhydroxamicacids and the stable piperidine N-oxyl (1); since the O–H bond strength in (1)-H is known, this gives an estimate of the O–H bond strengths in the hydroxamic acids. These are found to be stronger than those in dialkyl nitroxide and increase with increasing electron demand in the acyl group.