4252-89-5Relevant articles and documents
Electrophilic and Nucleophilic Addition Reactions of α,β-Unsaturated Diphenylphosphoryl Compounds
Bichakhchyan, A. S.,Derdzyan, L. V.,Gasparyan, G. Ts.,Ovakimyan, M. Zh.,Poghosyan, A. S.
, p. 90 - 94 (2020/03/25)
Procedures were developed for the synthesis of diphenyl(prop-1-en-1-yl)phosphine oxide and cyclohex-1-en-1-yl(diphenyl)phosphine oxide by alkaline hydrolysis of triphenyl(prop-1-en-1-yl)phosphonium bromide and cyclohex-1-en-1-yl(triphenyl)phosphonim bromi
New selectivities from old catalysts. Occlusion of Grubbs' catalysts in PDMS to change their reactions
Brett Runge,Mwangi, Martin T.,Bowden, Ned B.
, p. 5278 - 5288 (2007/10/03)
This article describes new selectivities for Grubbs' first and second generation catalysts when occluded in a hydrophobic matrix of polydimethylsiloxane (PDMS). Occlusion of catalysts in mm-sized slabs of PDMS is accomplished by swelling with methylene chloride then removing the solvent under vacuum. The catalysts are homogenously dissolved in PDMS yet remain catalytically active. Many substrates that react by olefin metathesis with Grubbs' catalysts freely dissolved in methylene chloride also react by olefin isomerization with occluded catalysts. Eleven examples of substrates that exhibit dual reactivity by undergoing olefin isomerization with occluded catalysts and olefin metathesis with catalysts dissolved in methylene chloride are reported. Most of these substrates have olefins with allylic phosphine oxides, carbonyls, or ethers. Control experiments demonstrate that isomerization is occurring in the solvent by decomposition of the catalyst from a ruthenium carbene to a proposed ruthenium hydride. This work was extended by heating occluded Grubbs' first generation catalyst to 100 °C in 90% MeOH in H2O in the presence of various alkenes to transform the Grubbs' catalyst into an isomerization catalyst for unfunctionalized olefins. This work demonstrates that occlusion of organometallic catalysts in PDMS has important implications for their reactions and can be used as a method to control which reactions they catalyze.
CONTRASTING THERMAL REACTIONS OF ALLYLIC SULFILIMINES AND PHOSPHINIMINES
Baechler, Raymond D.,Blohm, Margaret,Rocco, Karen
, p. 5353 - 5354 (2007/10/02)
Allylic sulfilimines and phosphinimines undergo spontaneous but contrasting rearrangements at low temperatures.Whereas a sulfilimine is converted to an isomeric sulfenamide by (2,3)-sigmatropic rearrangement, a structurally analogous phosphinimine undergo
