33426-60-7Relevant academic research and scientific papers
Streamlined synthesis of the bippyphos family of ligands and cross-coupling applications
Withbroe, Gregory J.,Singer, Robert A.,Sieser, Janice E.
, p. 480 - 489 (2013/01/03)
We describe the efficient preparation of Bippyphos, 1. The key precursor to Bippyphos, 5, was prepared via a one-pot bromination of diketone 2 followed by alkylation with pyrazole and condensation with phenylhydrazine. Lithiation of 5 and trapping with ditert-butylchlorophosphine afforded Bippyphos, 1. Using this approach we have prepared several derivatives of Bippyphos to probe the structure and activity relationships of this family of phosphine ligands. We also demonstrate the utility of these ligands in Pdcatalyzed amination reactions and other cross-coupling reactions.
Arylation of Dialkyl Ethers by Gaseous Phenylium Ions. Formation and Behaviour of Dialkylphenyloxonium Ions in the Gas Phase
Fornarini, Simonetta,Speranza, Maurizio
, p. 171 - 178 (2007/10/02)
Tritiated phenylium ions, obtained in the gas phase from the spontaneous decay of 1,4-ditritiobenzene, have been allowed to react with dialkyl ethers (MeOPrn, MeOPri, and PriOPrn) in the pressure range 20-400 Torr and in the presence of a thermal radical scavenger (O2, 4 Torr).The effects of a gaseous base (NH3, 4 Torr) on the reaction carried out at the highest pressure were also investigated.Singlet phenylium ion confirms its distinct affinity toward the n-centre of the substrate (ca. 80percent for MeOPr), although significant insertion into the alkyl groups of PriOPrn is observed as well.The stability and reactivity features of the formed dialkylphenyloxonium ions, under the experimental conditions chosen, have been studied as well as their fragmentation and isomerization mechanism.The behaviour of dialkylphenyloxonium ions in the gas state (20-400 Torr) is consistent with previous mechanistic hypotheses from mass spectrometric studies, carried out at much lower pressures (below 1 Torr).
Cycloalkanecarboxanilide derivative herbicides
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, (2008/06/13)
Compounds of the formula STR1 wherein Y is C1-3 alkyl; R1 is an optionally substituted hydrocarbyl group and R2 is alkyl or halogen, are useful as herbicides.
Cycloalkanecarboxanilide derivative herbicides
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, (2008/06/13)
Certain cycloalkanecarboxanilide derivatives are useful as herbicides.
