222055-10-9Relevant academic research and scientific papers
CsOH-promoted P-alkylation: A convenient and highly efficient synthesis of tertiary phosphines
Honaker, Matthew T.,Sandefur, Benjamin J.,Hargett, James L.,McDaniel, Alicia L.,Salvatore, Ralph Nicholas
, p. 8373 - 7377 (2007/10/03)
A mild and efficient method for the synthesis of tertiary phosphines and ditertiary phosphines has been developed. In the presence of cesium hydroxide, molecular sieves and DMF at room temperature, various secondary phosphines and alkyl bromides were examined, and the results have demonstrated that this methodology offers a general synthetic procedure to produce tertiary phosphines in moderate to high yields. Optically active tertiary phosphine synthesis is also described.
Synthesis and evaluation of new RuCl2(p-cymene)(ER2R′) and (η1:η6-phosphinoarene)RuCl2 complexes as ring-opening metathesis polymerization catalysts
Jan, Dominique,Delaude, Lionel,Simal, Fran?ois,Demonceau, Albert,Noels, Alfred F.
, p. 55 - 64 (2007/10/03)
New RuCl2(p-cymene)(ER2R′) complexes (E = P, As, Sb; R, R′ = H, alkyl, arylalkyl) have been synthesized and used as catalyst precursors for the ring-opening metathesis polymerization (ROMP) of cyclooctene, cyclopentene, and norbornen
Cationic ruthenium allenylidene complexes as catalysts for ring closing olefin metathesis
Fuerstner, Alois,Liebl, Monika,Lehmann, Christian W.,Picquet, Michel,Kunz, Rainer,Bruneau, Christian,Touchard, Daniel,Dixneuf, Pierre H.
, p. 1847 - 1857 (2007/10/03)
A series of well accessible cationic ruthenium allenylidene complexes of the general type [(η6-arene)(R3P)RuCl(=C=C=CR′2)] + X- is described which constitute a new class of pre-catalysts for ring closing olefin metathesis reactions (RCM) and provide an unprecedented example for the involvement of metal allenylidenes in catalysis. They effect the cyclization of various functionalized dienes and enynes with good to excellent yields and show a great tolerance towards an array of functional groups. Systematic variations of their basic structural motif have provided insights into the essential parameters responsible for catalytic activity which can be enhanced further by addition of Lewis or Bronsted acids, by irradiation with UV light, or by the adequate choice of the "non-coordinating" counterion X-. The latter turned out to play a particularly important role in determining the rate and selectivity of the reaction. A similarly pronounced influence is exerted by remote substituents on the allenylidene residue which indicates that this ligand (or a ligand derived thereof) may remain attached to the metal throughout the catalytic process. X-ray crystal structures of the catalytically active allenylidene complexes 3b · PF6 and 15 · OTf as well as of the chelate complex 10 required for the preparation of the latter catalyst are reported.
