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Monday, August 10, 2020 | History

2 edition of Complexes of platinum with substituted aryl acetylenes and phosphines. found in the catalog.

Complexes of platinum with substituted aryl acetylenes and phosphines.

Christopher David Cook

Complexes of platinum with substituted aryl acetylenes and phosphines.

by Christopher David Cook

  • 83 Want to read
  • 7 Currently reading

Published in Toronto .
Written in English

    Subjects:
  • Acetylene compounds,
  • Phosphine,
  • Platinum

  • Edition Notes

    ContributionsToronto, Ont. University.
    The Physical Object
    Pagination126 leaves.
    Number of Pages126
    ID Numbers
    Open LibraryOL19695562M

    When complex 21a and phenylboronic acid were heated together with either ortho - or para-substituted aryl chlorides in a mixture of dimethylformamide and water, using potassium carbonate as the base, the desired coupling products were produced in reasonable yields. The methodology was also applicable to aryl iodides and aryl bromides. Devi Prasan Ojha and Kandikere Ramaiah Prabhu, Palladium Catalyzed Coupling of Tosylhydrazones with Aryl and Heteroaryl Halides in the Absence of External Ligands: Synthesis of Substituted Olefins, The Journal of Organic Chemistry, /joc, 77, 24, (), ().

    Similar to the original mechanism, the Pd 0 cycle begins with the oxidative addition of the aryl halide or triflate to the Pd 0 catalyst, forming complex B and activating aryl halide substrate for the reaction.; Acetylene is activated in the second, Pd II mediated cycle. Phenylacetylene was proven to form Pd monoacetylide complex D as well as Pd bisacetylide complex F under mild reaction. The catalytic activity of nickel complexes in hydrophosphination involving secondary phosphines is not a commonly studied transformation. Beyond a small number of stand-out examples, many reports in the literature focus on the use of simple nickel salts. β-Diketiminates have been proven to be incredibly effective ligands for catalysis using a range of metal centers.

    t-Bu 2 (p-NMe 2 C 6 H 4)P is an efficient ligand for palladium catalysts in Heck alkynylation of various aryl halides with a range of aryl- and alkyl-acetylenes in excellent yields, under relatively low Pd loadings. Preliminary mechanistic studies on the negative copper effect and substrate effect of aryl acetylenes help to better understand. The Buchwald–Hartwig amination is a chemical reaction used in organic chemistry for the synthesis of carbon–nitrogen bonds via the palladium-catalyzed coupling reactions of amines with aryl halides. Although Pd-catalyzed C-N couplings were reported as early as , Stephen L. Buchwald and John F. Hartwig have been credited, whose publications between and the late s established.


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Complexes of platinum with substituted aryl acetylenes and phosphines by Christopher David Cook Download PDF EPUB FB2

Platinum Metal Complexes of Substituted Aryl Phosphines IMPORTANT ASPECTS OF THEIR CATALYTIC AND CO-ORDINATION CHEMISTRY By Thomas B. Rauchfuss School of Chemical Scirnces. University of Illinois, Ilrhana, U.S.A.

Highlights of the co-ordination chemistry of platinum metal complexes of phosphorus-oxygen chelating agents are described. The ligands of. Highlights of the co-ordination chemistry of platinum metal complexes of phosphorus-oxygen chelating agents are described.

The ligands of interest all contain the oxygen bearing substituent (methoxy, hydroxy, formyl, carboxy-) ortho to a phosphine on a benzene ring; complexes of these ligands are efficient homogeneous catalysts for hydrogenation, isomerisation and polymerisation reactions.

the effect of substituents on the stabilities of complexes of platinum with aryl acetylenes and phosphines Article in Canadian Journal of Chemistry 41(5) February with 3 Reads. Metal complexes of functionalized phosphines-I. Synthesis and characterization of 2-diphenylphosphinoethylamines and some of their complexes with platinum.

X-ray structure of [HBut)(Ph2PCH2CH2NHButHCl)Cl]ClH2O. Polyhedron10 (), DOI: /S(00) by: 1. Compounds of platinum (0) with aryl phosphines are stabilized by electron-withdrawing substituants.

A maximum coordination number of three is observed in such cases, suggesting that platinum. Rhodium(I) complexes of alkyl- and aryl-substituted 1,5-diaza-3,7-diphosphacyclooctanes were also synthesized by reacting the corresponding bidentate α-aminophosphines with [Rh I (cod)BF 4] 2.

89 The complexes were tested as catalysts in the reaction of CO 2 with hydrogen and showed moderate catalytic activities. Cross coupling of aryl, alkenyl, and alkynyl magnesium compounds by using 2,2,6,6-tetramethylpiperidine-N-oxyl radical (TEMPO) as an environmentally benign organic oxidant is described.

This coupling reaction can be performed without adding any transition metal on various ortho-substituted aryl and alkynyl Grignard reagents. Importantly, functional groups such as esters, amides, and. Nouera (Italy) (Received January 17th, E) Summary Acetylene or monosubstituted acetylenes are converted into aryl- and vinyl-substituted acetylene derivatives by reaction with aryl and vinyl halides in the presence of a nickel or palladium triaryiphosphine complex along with a base.

A.D. Allen, C.D. CookThe effect of substituents on the stabilities of complexes of platinum with aryl acetylenes and phosphines Can. Chem., 41 (), p. Google Scholar. The Sonogashira coupling of various aryl bromides and iodides with different acetylenes was studied under biphasic conditions with soluble, polymer‐modified catalysts to allow the efficient recycling of the homogeneous catalyst.

For this purpose, several sterically demanding and electron‐rich phosphines of the type R P PR 2 were. Compositions of matter are disclosed which are highly useful in hydroformylation processes.

The compositions are non-charged, non-chelated bis- and tris-(alkyl diaryl phosphine) rhodium carbonyl hydrides. The substituents of the alkyl group include heteroorganic radicals containing silane, silicone, ether, ester, keto and hydroxy oxygen, phosphine oxide and phosphorus ester phosphorus, amine.

high melting, high molecular weight interpolymers of carbon monoxide with at least one unsaturated compound such as the aliphatic monoolefins, i.e., ethylene, are prepared by reacting carbon monoxide with said unsaturated compounds in the presence of an aryl phosphine complex of a palladium halide and certain inert solvents.

Complexes cis-[PtR 2 (dmso) 2] and cis-[PtRCl(dmso) 2](dmso = dimethyl sulphoxide) are readily obtained from K 2 [PtCl 4] and SnMe 3 R (R = aryl or Me) in dmso at 70–90 °C.

Hydrogen-1 n.m.r. spectra show that the dmso ligands are bound through sulphur in solution and that the dmso ligand trans to R in cis-[PtRCl(dmso) 2] undergoes dissociation and exchange at ambient temperature.

Dirk Meyer, Alexander Zeller, Thomas Strassner, Platinum complexes with pyrimidine-functionalized N-heterocyclic carbene ligands – Synthesis and solid state structures, Journal of Organometallic Chemistry, /chem,(), ().

Catalytic systems leading to Markovnikov‐type (branched) vinyl chalcogenides. A real breakthrough in this field was made in when the group of Ogawa and Sonoda et al. revealed that different transition‐metal complexes (Pd, Pt, Rh, Ni) could catalyze the addition of various aryl thiols to terminal alkynes with the formation of vinyl sulfides.

9 The selectivity of the process. substituted phenylacetylenes. the effect of substituents on the stabilities of complexes of platinum with aryl acetylenes and phosphines. allen, c. cook elemental organic compounds: vi. significance of π-radical hybridization: new synthetic method for bis-arene π-complexes.

minoru tsutsui, george chang» abstract. N-aryl bond formation is the synthesis of highly selective D3 receptor ligands 4. Piperazine (1) and a substituted aryl bro-mide 2 (Scheme€1) are coupled in the initial step of the syn-thesis. The electron-withdrawing substituents (nitrile and chloro) on the aryl bromide assisted the reaction, and reported yields of 3 are in the range of Novel platinum complexes incorporating phosphine ligands have been developed by us.

On the one hand, platinum complexes of PtL 2 Cl 2 type were synthesized, where L represents a 3-phospholene, phospholane, 1,2,3,6-tetrahydrophosphinine or 1,4-dihydrophosphinine moiety in differently substituted forms. In a few cases, the P-ligands were used in an optically active form.

Complexes of zerovalent nickel with phosphines and certain other ligands of a similar type are active in the copoly-merisation of acetylenes with butadiene ".

analogous conditions, substituted acetylenes form linear polymers and benzene derivatives In the mixed cyclo-tetramerisation of acetylene with mono- and di-substituted. The C–P bond formation of aryl phosphines is typically catalyzed by palladium, nickel and less frequently copper.

The phosphorus coupling partners used are primary, secondary and tertiary phosphines, secondary phosphine–borane complexes, silyl-. It was shown that in reactions of aryl iodides with terminal acetylenes catalyzed by palladium complexes, potash or alkali can be used as a base in the interfacial system.

This is a preview of subscription content, log in to check access.title = "Platinum Metal Complexes of Amine- and Ether-Substituted Phosphines", abstract = "o-Diphenylphosphinoanisole (PO), o-diphenylphosphinobenzyl methyl ether (PCO), and o-diphenylphosphino-N,N-dimethylbenzylamine (PCN) have been synthesized.

Platinum complexes bearing chiral phosphines catalyze oxidation of substituted cyclic ketones in the presence of hydrogen peroxide (Scheme \(\PageIndex{2}\)). Coordination of Pt and peroxide to the carbonyl leads to the formation of a metallocycle .