Formation of a new class of 7π radicals via sterically induced P–P bond cleavage of the dimers [(CH)2(NR)2P]2
作者:Ruth Edge、Robert J. Less、Eric J. L. McInnes、Kristine Müther、Vesal Naseri、Jeremy M. Rawson、Dominic S. Wright
DOI:10.1039/b821241d
日期:——
The 2c-2e- P-P bonded dimers [(CH)2(NR)2P]2 dissociate in solution to give the persistent new 7pi radicals [(CH)2(NR)2P]*, which are isoelectronic with the well known S/N thiazolyl radicals.
N‐Heterocyclicphosphanes react under UV irradiation in a highly selective dehydrocoupling reaction to diphosphanes and H2. Computational studies suggest that the product formation is initiated by the formation of dimeric molecular associates whose electronic excitation yields H2 and a diphosphane. Combining the dehydrocoupling of sterically demanding phosphanes with Mg‐reduction of the formed diphosphanes
Functionalization of Bis‐Diazaphospholene P–P Bonds with Diverse Electrophiles
作者:Blake S. N. Huchenski、Katherine N. Robertson、Alexander W. H. Speed
DOI:10.1002/ejoc.202000880
日期:2020.8.31
Diazaphospholene dimers readily react with aryl and alkyl halides to form carbon–phosphorus bonds without requiring catalysts, under mild conditions. Both polar and radical mechanisms are operative, depending on the substrate.
1,3,2‐Diazaphospholene‐Catalyzed Reductive Cyclizations of Organohalides**
作者:Johannes Klett、Łukasz Woźniak、Nicolai Cramer
DOI:10.1002/anie.202202306
日期:2022.7.25
1,3,2-diazaphospholenes hydrides (DAP-H) are shown as efficient catalysts for reductive radical cyclization of aryl and alkyl halides under irradiation with visible light. The pivotal DAP catalyst turnover was achieved by a DBU-assisted σ-bondmetathesis between the formed DAP halide and HBpin.
Diazaphospholene‐Catalyzed Radical Reactions from Aryl Halides**
作者:Robert D. Riley、Blake S. N. Huchenski、Karlee L. Bamford、Alexander W. H. Speed
DOI:10.1002/anie.202204088
日期:2022.7.25
Diazaphospholene radical chemistry has been made catalytic with a combination of carbonates and phenylsilane as a terminal reductant. The system is suitable for generation of aryl radicals and intermolecular and intramolecular addition of these radicals.