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Alkyne complexe

Alkyne complexes are essentially similar to the alkenes (p. 932) and those of Pt particularly when the alkyne incorporates the <-butyl group, are the most stable. Ni alkyne complexes are less numerous and generally less stable but are of greater practical importance because of their role as intermediates in the cyclic oligomerization of alkynes, discovered by W. Reppe (see Panel). [Pg.1171]

Initial step is the formation of a dicobalthexacarbonyl-alkyne complex 5 by reaction of alkyne 1 with dicobaltoctacarbonyl 4 with concomitant loss of two molecules of CO. Complex 5 has been shown to be an intermediate by independent synthesis. It is likely that complex 5 coordinates to the alkene 2. Insertion of carbon monoxide then leads to formation of a cyclopentenone complex 6, which decomposes into dicobalthexacarbonyl and cyclopentenone 3 ... [Pg.223]

Products 7a and 7c, with the substituent R a to the carbonyl group, are by far predominantly formed. This regioselectivity is a result of the preferential approach of the alkene 2 to the dicobalthexacarbonyl-alkyne complex 5 from the side opposite to the substituent R of the original alkyne. The actual incorporation of the alkene however is less selective with respect to the orientation of the olefinic substituent R, thus leading to a mixture of isomers 7a and 7c. [Pg.224]

B. Alkene and Alkyne Complexes 1. Mono-enes and Mono-ynes... [Pg.149]

The reaction of alkenes with alkenes or alkynes does not always produce an aromatic ring. An important variation of this reaction reacts dienes, diynes, or en-ynes with transition metals to form organometallic coordination complexes. In the presence of carbon monoxide, cyclopentenone derivatives are formed in what is known as the Pauson-Khand reaction The reaction involves (1) formation of a hexacarbonyldicobalt-alkyne complex and (2) decomposition of the complex in the presence of an alkene. A typical example Rhodium and tungsten ... [Pg.1091]

Attempts to exploit the reaction of the dianion with alkyl halides to produce a c/.v-dialkyl complex by using 1,2- or 1,3-dihaloalkanes did not indeed give this result. The reaction of Ru(Por) " with 1,2-dibromoethane was sucessful, but the resulting metallacyclopropane product is better formulated as a /r-complex of ethene, and will be discussed below in the section on alkenc and alkyne complexes. The corresponding reaction of the diiinion with 1,3-dichloropropane gave no evidence for a metallacyclobutane. but instead free cyclopropane was detected by GC analysis and the porphyrin product was Ru(TTP)(THF)2. ... [Pg.266]

Melikyan GG, Nicholas KM (1995) The Chemistry of Metal-Alkyne Complexes. In Stang... [Pg.76]

The strong o-donor property of NHC ligands enhances the catalytic activity in [3+2] cycloaddition by promoting the activation of internal alkynes (i.e. 26), which proceeds by the formation of a ti-alkyne complex 25 (Scheme 5.7). [Pg.136]

Two S/P ligands derived from camphor, CamPHOS and MeCamPHOS were also developed by these authors for the diastereoselective coordination to alkyne-hexacarbonyldicobalt complexes (Scheme 10.68). These two ligands were converted in good yields into their borane-protected forms. The influence of the alkyne group (R) on their coordination to dicobalt-hexacarbonyl-alkyne complexes was evaluated. It was shown that MeCamPHOS ligand provided a... [Pg.345]

R = alkyl.502 (307) (R1 = R2 = Ph) reacts with alkynes to form a ketene alkyne complex, (308), which ultimately yields the five-coordinate Ir111 species (309).503... [Pg.204]

The copper-alkoxo unit, which is usually synthesized in situ, plays a significant role in metal-promoted transformations of organic substrates by copper(I). To determine the reaction form of the Cu-OPh unit, Floriani and co-workers structurally characterized four complexes (772) (pseudotetrahedral Cu-Cu 3.223 AT (773) (pseudotetrahedral), (774) ( anion linear coordination) and (775) (planar trigonal).57 Using 3,3,6,6-tetramethyl-l-thia-4-cycloheptyne as terminal ligand the structural characterization of a copper(I)-alkyne complex (776) (Cu-Cu 2.940 A) was reported.573... [Pg.892]

Went, Michael J., Synthesis and Reactions of Polynuclear Cobalt-Alkyne Complexes. 41 69... [Pg.309]

The alkyne complex (dtbpm)Pt(Me3SiC2SiMe3) is also formed, but is not a precursor to the C-Si activation product. [Pg.249]


See other pages where Alkyne complexe is mentioned: [Pg.1170]    [Pg.1170]    [Pg.1172]    [Pg.81]    [Pg.145]    [Pg.79]    [Pg.235]    [Pg.236]    [Pg.237]    [Pg.240]    [Pg.241]    [Pg.241]    [Pg.461]    [Pg.174]    [Pg.346]    [Pg.105]    [Pg.240]    [Pg.167]    [Pg.178]    [Pg.206]    [Pg.215]    [Pg.218]    [Pg.239]    [Pg.247]    [Pg.153]    [Pg.180]    [Pg.180]   
See also in sourсe #XX -- [ Pg.144 , Pg.148 ]




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1,3-isomerization, alkyne complexes

18-electron count, alkyne complexes

Acetylene complexes alkyne addition

Alkene and alkyne complexes

Alkyl complexes alkyne insertions

Alkyl, aryl, alkene and alkyne complexes

Alkylidyne complexes, reactions with alkyne

Alkynals, cyclization complexes

Alkyne Addition to the Transition Metal Salts and Complexes

Alkyne Insertions with Nickel-Allyl Complexes

Alkyne alkylidyne metal complexes

Alkyne clusters complexes

Alkyne complexe binuclear

Alkyne complexes

Alkyne complexes

Alkyne complexes 1,4-diphenylbutadiyne

Alkyne complexes anionic donor ligands

Alkyne complexes applications

Alkyne complexes bidentate donor ligands

Alkyne complexes bonding

Alkyne complexes carbon donor ligands

Alkyne complexes catalytic activity

Alkyne complexes chemistry

Alkyne complexes copper-iron compound

Alkyne complexes crystal structures

Alkyne complexes deprotonation

Alkyne complexes exchange reactions with alkynes

Alkyne complexes group migration

Alkyne complexes metal hydroxides

Alkyne complexes nitrogen donor ligands

Alkyne complexes nucleophilic attack

Alkyne complexes of cobalt

Alkyne complexes origins

Alkyne complexes oxygen donor ligands

Alkyne complexes phosphorous donor ligands

Alkyne complexes platinum compounds

Alkyne complexes preparation

Alkyne complexes reactions

Alkyne complexes reactions with donor ligands

Alkyne complexes ruthenium porphyrins

Alkyne complexes structural characteristics

Alkyne complexes structures

Alkyne complexes sulfur donor ligands

Alkyne complexes synthesis

Alkyne complexes thermal decomposition

Alkyne complexes with carbon monoxide

Alkyne insertion metal carbene complexes

Alkyne metathesis reaction complexes

Alkyne reactions with cobalt carbonyl complexes

Alkyne-cobalt complex

Alkyne-derived complexes

Alkyne-iron carbonyl complexes

Alkyne-metallocene complexes

Alkynes Metal-alkyne complexes

Alkynes actinide complexes

Alkynes allenyl complexes, reaction with

Alkynes catalysts, palladium complexes

Alkynes catalysts, rhodium complexes

Alkynes complex formation

Alkynes complex hydrides

Alkynes complex with hexacarbonyldicobalt

Alkynes complex with mercury

Alkynes complex, protonation

Alkynes coupling with carbene complexes

Alkynes diyne complexation

Alkynes n-complexation

Alkynes niobium complexes

Alkynes novel complexes

Alkynes octacarbonyldicobalt complexes

Alkynes organolanthanide complexes

Alkynes reaction with alkoxycarbene complexes

Alkynes reaction with carbene complexes

Alkynes reactions with Fischer carbene complexes

Alkynes tantalum complexes

Alkynes via cationic iron complexes

Alkynes, -complexes with

Alkynes, reaction with platinum complexes

Alkynes, reactions with transition metal complexes

Aryl complexes from alkynes

Benzyne, Cycloalkyne, and Complexes of Other Reactive Alkynes

Binuclear metal-alkyne complexes

Bonding and Structure of Metal-Alkyne Complexes

Bonding, metal-alkyne complexes

Borane complexes reaction with alkynes

Carbene complexes with alkynes

Carbene-alkyne complexes

Carbon-palladium complexes, alkene/alkyne insertion

Carbyne complexes, reactions with alkyne

Cationic alkyne complexes

Cationic palladium complexes alkyne carbonylation

Cluster complexes alkyne derivatives

Cobalt, complexes with alkynes

Complexed terminal alkynes, base

Complexes Containing Alkynes

Complexes alkene/alkyne

Complexes hexacarbonyldicobalt-alkynes

Complexes of alkynes

Complexes, alkyne-metal

Complexes, alkyne-metal 2 + 2]-cycloaddition

Complexes, alkyne-metal Grignard reagents

Complexes, alkyne-metal Lewis acid-base

Complexes, alkyne-metal aldehydes

Complexes, alkyne-metal charge transfer

Complexes, alkyne-metal cyclotrimerization

Complexes, alkyne-metal decarbonylation

Complexes, alkyne-metal electron donor-acceptor

Complexes, alkyne-metal encounter

Complexes, alkyne-metal ethers

Complexes, alkyne-metal metathesis

Complexes, alkyne-metal reactions

Compounds Derived from Alkynes and Carbonyl Complexes of Cobalt

Copper complexes with alkynes

Cross-coupling reactions metal-alkyne complexes

Cyclopentadienyl carbonyl complexes alkynes

Cyclopentadienyl carbonyl complexes with alkynes

D4 Alkyne complexes

Dicobalt-alkyne complex

Electrophilic Alkene and Alkyne Complexes

Enol ethers alkynic carbene complexes

Fischer carbene complexes alkyne concentration

Four-electron donor, metal-alkyne complexe

From Alkyne and Cyclopropene Complexes

Gallium alkyne complexes

Gold -alkyne complex

Gold Complexes for Alkyne Activation

Gold complexes with alkynes

Hydroamination by Attack on -ir-Olefin and Alkyne Complexes

Hydrothiolation of Alkynes Mediated by NHC-Ni Complexes

Iridium complexes alkene/alkyne reactions

Iron complexes alkyne

Markovnikov selectivity, metal-alkyne complexes reactions

Metal-alkyne complexe reactions

Metal-alkyne complexes chromium

Metal-alkyne complexes cobalt

Metal-alkyne complexes copper

Metal-alkyne complexes insertion reactions

Metal-alkyne complexes iridium

Metal-alkyne complexes manganese

Metal-alkyne complexes molybdenum

Metal-alkyne complexes nickel

Metal-alkyne complexes niobium

Metal-alkyne complexes osmium

Metal-alkyne complexes palladium

Metal-alkyne complexes platinum

Metal-alkyne complexes protecting group

Metallacyclobutane complexes reactions with alkynes

Metallacyclopentadiene complexes from alkynes

Molecular electronics metal-alkyne complexes

Molybdenum complexes alkyne

Molybdenum complexes alkyne, structures

Molybdenum complexes four-electron alkyne ligands

Molybdenum complexes reaction with alkynes

N-Alkyne complexes

Nickel complexes alkynes

Nickel complexes phosphine alkyne

Niobium complexes reactions with alkynes

Nonaromatic Alkene and Alkyne Complexes

Nucleophilic metal-alkyne complexes reactions

Organocopper complexes alkynes

Osmium complexes alkyne ligands

Oxidation states tungsten-alkyne complexes

Palladium complexes alkynes

Palladium®) complexes alkene/alkyne insertion

Platinum complexes alkynes

Platinum complexes dimeric alkynes

Polynuclear alkyne complexes

Reactions of Alkyne Complexes

Reactions of metal-alkyne complexes

Rhodium alkyne complex

Rhodium complexes alkene/alkyne reactions

Rhodium complexes alkyne hydration

Ring-closing alkyne metathesis complex

Ring-closing alkyne metathesis tungsten alkylidyne complex

Ruthenium alkyne complex

Ruthenium complexes alkyne reactions

Samarium complexes reaction with alkynes

Silicon-transition-metal complexes alkynes

Silver complexes with alkynes

Sonogashira coupling, metal-alkyne complexes

Special applications of metal-alkyne complexes

Stille coupling, metal-alkyne complexes

Strained cyclic alkyne-transition-metal complex

Structure metal-alkyne complexes

TUngsten complexes alkyne, structures

TUngsten complexes four-electron alkyne ligands

Ta-alkyne complexes

Tantalum complexes reactions with alkynes

The Alkyne Cobalt Carbonyl Complexes

Theoretical studies nickel—alkyne complexes

Titanium alkyne complexes

Titanium complexes with alkynes

Transition metal complexes with alkynes

Transition metals alkyne complexes

Triosmium complexes with alkyne ligands

Triruthenium complexes with alkyne ligands

Tungsten alkyne molybdenum complex

Tungsten carbonyl complexes alkynes

Tungsten complexes alkynes

Tungsten complexes with alkynes

Vinylidene complexes from alkynes

Vinylidene complexes, alkyne

Vinylidene complexes, alkyne polymerization

Zirconium complexes alkynes

Zirconocene alkyne complex

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