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Ylides compounds

Oxidative addition of dihalomethanes CH2X2 to cyclic gold(i) ylide compounds yields bicyclic compounds with a methylene bridge between two gold(m) centers.2 The two halogens can also be replaced by diphenyl-dithiophosphinate groups to give products which are kinetically stable toward reductive elimination (Equation (38)).191... [Pg.279]

Trialkyl(2-borylvinyl)stannanes react with sulphur bis(trimethylsilylimide) to yield heterocyclic ylide compounds, as shown in reaction 21277. [Pg.407]

The anionic bis-ylide compounds [R2P(CH2)2] bonded as bridging ligands (mode VI) have been extensively studied in complexes of coinage metals, mainly... [Pg.37]

An attempted synthesis of biotin using thiocarbonyl ylide cycloaddition was carried out (131,133,134). The crucial step involves the formation of the tetrahydrothiophene ring by [3 + 2] cycloaddition of a properly substituted thiocarbonyl ylide with a maleic or fumaric acid derivative (Scheme 5.27). As precursors of the thiocarbonyl ylides, compounds 25a, 72, and 73 were used. Further conversion of cycloadducts 74 into biotin (75) required several additional steps including a Curtius rearrangement to replace the carboxylic groups at C(3) and C(4) by amino moieties. [Pg.332]

Stability of both the parent system and the S- oxide is conferred by the presence of electron-withdrawing substituents on the carbon framework, especially at positions 2, 4 and 6, while electron-donating substituents on sulfur also help. Compounds (48), (49) and (50) illustrate these conclusions, as they are air-stable, isolable species (74CL1101). Exactly analogous factors acting on stability are seen with acyclic sulfonium and sulfoxonium ylide compounds. [Pg.895]

One possibility for these side reactions might be to form ylide compounds, as shown in Scheme 5. [Pg.65]

In an attempt to increase the reactivities of diarylmethylene(triphenyl)phos-phorane ylides, compounds (13) and (14) have been prepared and studied by... [Pg.159]

The anionic bis-ylide compounds [R2P(CH2)2] bonded as bridging ligands... [Pg.37]

Conversely, certain mono(ylide) complexes are accessible from the respective bis(ylide) compounds. Reaction between complexes of the type [Au(ylide)2]ClC>4 and aurates such as NR4AUX2] (X = Cl, Br, C6F5, QC affords neutral halogold and (haloaryl)gold(I)... [Pg.254]

As can be seen, the attack of the nucleophillic oxygen of the ylide compound to the growing carbocation chain terminates polymerization. A steric hindrance around... [Pg.428]

Ylides, Compounds in which an atom from group V Or VI of the periodic table, bearing a positive charge, is connected to a carbon atom carrying an unshared pair of electrons. Ref A. William Johnson, Ylid Chemistry (Academic Press, New York, 1966) B, M, Trost, L, S, Melvin, Sulfur Ylides (Academic Press, New York, 1975) J. March, Advanced Organic Chemistry (McGraw-Hill, New York, 2nd ed 1977) p 40. [Pg.1594]

Phosphonium ylides - Compounds having the structure RjP -C Rj R3P=CR2. Also known as Wittig reagents. [5]... [Pg.113]


See other pages where Ylides compounds is mentioned: [Pg.57]    [Pg.638]    [Pg.494]    [Pg.418]    [Pg.65]    [Pg.144]    [Pg.249]    [Pg.371]    [Pg.372]    [Pg.373]    [Pg.328]    [Pg.419]    [Pg.45]    [Pg.45]    [Pg.112]    [Pg.14]    [Pg.116]   
See also in sourсe #XX -- [ Pg.872 , Pg.976 ]




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Acetone compounds, carbonyl ylides

Arsenic compounds ylides

Arsonium ylides reaction with carbonyl compounds

Carbonyl compounds phosphonium ylides

Chiral compounds sulfur ylides

Condensation of Phosphonium Ylides with Carbonyl Compounds Wittig Reaction

Diazo compounds nitrile ylide generation

Diazo compounds thiocarbonyl ylides

Diazo compounds, ylide formation

Epoxide compounds carbonyl ylide generation

Epoxides carbonyl compounds and sulfur ylides

Ether compounds carbonyl ylide generation

Imine compounds azomethine ylide generation

Nature of the Ylide and Carbonyl Compound

Nitrile compounds carbonyl ylide generation

Nitrile ylides nitro compounds

Organogold! 11) compounds ylides

Oxidation of Alcohols to Carbonyl Compounds with Activated Dimethyl Sulfoxide via Alkoxysulfonium Ylides. The Swern, Moffatt, and Related Oxidations

Phosphacumulene ylides reactions with acidic compounds

Phosphonium ylides carbonyl compound reactions

Phosphorane, oxovinylidenephosphonium ylide synthesis reactions with acidic compounds

Pyridinium Compounds, Ylides, Pyridine N-Oxides

Selenonium ylides reactions with carbonyl compounds

Sulfonium ylides compounds

Sulfoxonium ylides compounds

Sulfur compounds thiocarbonyl ylide generation

Sulfur ylides carbonyl compounds

Sulfur ylides reactions with carbonyl compounds

The chemistry of organophosphorus compounds, Volume 3, Phosphonium salts, ylides and phosphoranes Edited by Frank R. Hartley

The chemistry’ of organophosphorus compounds, Volume 3, Phosphonium salts, ylides and phosphoranes

Thiobenzophenone compounds, thiocarbonyl ylide

Thiourea compounds, thiocarbonyl ylide

Ylide compounds

Ylide compounds 1,3-dipolar cycloadditions

Ylide compounds 1,3-elimination reactions

Ylide compounds 1,3-thiazole derivatives

Ylide compounds 1.3- addition reactions

Ylide compounds 1.4- hydrogen shift

Ylide compounds 1.5- dipolar electrocyclization

Ylide compounds 3 + 2] cycloadditions

Ylide compounds Michael additions

Ylide compounds aldehyde derivation

Ylide compounds alkene-conjugated ylides

Ylide compounds alternative procedures

Ylide compounds asymmetric cycloadditions

Ylide compounds asymmetric reactions

Ylide compounds aziridine precursors

Ylide compounds azomethine ylides

Ylide compounds carbene reactions

Ylide compounds carbene/carbenoid additions

Ylide compounds carbonyl ylides

Ylide compounds chemical behavior

Ylide compounds chiral ylides

Ylide compounds cycloaddition reactions

Ylide compounds derivations

Ylide compounds development

Ylide compounds dimerization reactions

Ylide compounds directed syntheses

Ylide compounds electrocyclization reactions

Ylide compounds electrocyclizations

Ylide compounds enantioselective additions

Ylide compounds enantioselective syntheses

Ylide compounds epoxide generation

Ylide compounds ester derivation

Ylide compounds five-membered rings

Ylide compounds generation

Ylide compounds generation mechanisms

Ylide compounds heteroatoms

Ylide compounds heterocyclic synthesis

Ylide compounds intermolecular reactions

Ylide compounds intramolecular cycloadditions

Ylide compounds intramolecular reactions

Ylide compounds irreversibility

Ylide compounds ketone derivation

Ylide compounds metal-mediated reaction

Ylide compounds nitrile ylides

Ylide compounds nucleophile reactions

Ylide compounds reactivity properties

Ylide compounds seven-membered rings

Ylide compounds structural properties

Ylide compounds structural studies

Ylide compounds thiocarbonyl ylides

Ylide compounds thiophene derivatives

Ylide compounds thioxonium salts, deprotonation

Ylide compounds using

Ylide compounds ylides, heterocyclic synthesis

Ylide formation carbene synthesis, diazo compounds

Ylides and Related Compounds

Ylides and Related Compounds By B.J. Walker 2 Methylenephosphoranes

Ylides aromatic compounds

Ylides bond compounds

Ylides reactions with carbonyl compounds

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