Big Chemical Encyclopedia

Chemical substances, components, reactions, process design ...

Articles Figures Tables About

Reactions with Alkynes

In aqueous media, the addition of unactivated alkynes to unactivated alkenes to form Alder-ene products has been reahzed by using a mthe-nium catalyst (Eq. 3.44). ° A polar medium (DME H20 = 1 1) favors the reaction and benefits the selectivity. The reaction was proposed to proceed via a ruthenacycle intermediate. [Pg.58]

Mascarenas developed a synthetic method to 1,5-oxygen-bridged medium-sized carbocycles through a sequential mthenium-catalyzed alkyne-alkene coupling and a Lewis-acid-catalyzed Prins-type reaction (Eq. 3.45). The mthenium-catalyzed reaction can be carried out in aqueous media (DMF/H2O = 10 1).  [Pg.59]

The addition of allyl alcohol to alkynes to form y,8-unsaturated ketones and aldehydes (Eq. 3.46) in aqueous media was developed by both Trost and Dixneuf.  [Pg.59]


Anhydro-3-hydroxy-2-phenylthiazolo[2,3-6]thiazolylium hydroxide (407) underwent ready thermal reaction with alkynic and alkenic dipolarophiles in refluxing toluene. With the former dipolarophile sulfur was lost from the intermediate 1 1 cycloadduct (408) to give the substituted 5H-thiazolo[3,2- i]pyridin-5-ones (409). With the latter, the intermediate (410) lost H2S, also forming (409). [Pg.150]

Oxazolium hydroxide, anhydro-5-hydroxy-aromaticity, 6, 184 cycloaddition reactions, 6, 209 dimerization, 6, 207 1,3-dipolar cycloaddition reactions with alkynes, 6, 210 electrophilic reactions, 6, 207 mesoionic reactions, 6, 188 reactions, 6, 206-211 synthesis, 6, 225-227... [Pg.729]

Chirality center, 292 detection of, 292-293 Eischer projections and, 975-978 R,S configuration of, 297-300 Chitin, structure of, 1002 Chloral hydrate, structure of, 707 Chloramphenicol, structure of, 304 Chlorine, reaction with alkanes, 91-92,335-338 reaction with alkenes, 215-218 reaction with alkynes, 262-263 reaction with aromatic compounds, 550 Chloro group, directing effect of, 567-568... [Pg.1291]

Liquid chromatography. 432 Lithium, reaction with alkynes, 269-270... [Pg.1303]

Because of the strongly electron-withdrawing character of the Cr(CO)5 unit, the reaction with alkynes to hydroquinone and phenol derivatives [35-37] (Dotz reaction) is possible according to Scheme 6 (see also Chap. 4 Chromium -templated Benzannulation Reactions ). [Pg.5]

Alkylideneaminocarbene complexes 76, which are aza analogs of alkenyl-carbene complexes, upon reaction with alkynes primarily give formal [3+2] cycloadducts analogous to the 1-aminocarbene complexes (Scheme 16) [74,75]. Aumann et al. proposed that this should be considered as a formal 1,3-dipo-... [Pg.33]

The reaction of alkoxyarylcarbene complexes with alkynes mainly affords Dotz benzannulated [3C+2S+1C0] cycloadducts. However, uncommon reaction pathways of some alkoxyarylcarbene complexes in their reaction with alkynes leading to indene derivatives in a formal [3C+2S] cycloaddition process have been reported. For example, the reaction of methoxy(2,6-dimethylphenyl)chromium carbene complex with 1,2-diphenylacetylene at 100 °C gives rise to an unusual indene derivative where a sigmatropic 1,5-methyl shift is observed [60]. Moreover, a related (4-hydroxy-2,6-dimethylphenyl)carbene complex reacts in benzene at 100 °C with 3-hexyne to produce an indene derivative. However, the expected Dotz cycloadduct is obtained when the solvent is changed to acetonitrile [61] (Scheme 19). Also, Dotz et al. have shown that the introduction of an isocyanide ligand into the coordination sphere of the metal induces the preferential formation of indene derivatives [62]. [Pg.75]

This photodriven benzannulation was used in the synthesis of indolocar-bazoles (Eq. 22) [96] and calphostins (Eq. 23) [97]. The thermal insertion of isonitriles into these same classes of carbenes provided a complementary approach to similar benzannulations [98-100]. Manganese alkoxycarbene complexes underwent both inter- [101] and intramolecular [102] photodriven benzannulation reactions with alkynes (Eqs. 24 and 25). [Pg.181]

Protonic acid and Lewis acids can activate carbonyls to facilitate the addition of nucleophile attacks in aqueous media. The Prins reaction, reaction with alkyne, and Friedel-Crafts-type reactions have been discussed in related chapters in detail. [Pg.281]

Distannenes are in equilibrium with the corresponding stannylenes in solution therefore, reaction with alkynes can lead either to stannacyclo-propene or l,2-distannacyclobut-3-ene derivatives. Reaction of tetra-... [Pg.315]

In organometallic systems in particular, clusters with bridging alkylthiolates are well known, as exemplified by Co2(Cp)2(/i-SCH3)2, which undergoes reactions with alkyne-cobalt complexes to yield trinuclear clusters.170... [Pg.16]

Another recent development in the field of palladium-catalyzed reactions with alkynes is a novel multicomponent approach devised by the Lee group. Starting from a-bromovinyl arenes and propargyl bromides, the assembly ofeight-membered car-bocycles can be realized via a cross-coupling/[4+4] cycloaddition reaction. The authors also presented the combination of a cross-coupling and homo [4+2], hetero [4+2], hetero [4+4] or [4+4+1] annulation leading to various cyclic products [147]. [Pg.411]


See other pages where Reactions with Alkynes is mentioned: [Pg.60]    [Pg.491]    [Pg.923]    [Pg.262]    [Pg.1289]    [Pg.1289]    [Pg.1310]    [Pg.93]    [Pg.177]    [Pg.228]    [Pg.59]    [Pg.78]    [Pg.141]    [Pg.301]    [Pg.77]    [Pg.212]    [Pg.29]    [Pg.100]   
See also in sourсe #XX -- [ Pg.71 ]

See also in sourсe #XX -- [ Pg.998 , Pg.1042 ]

See also in sourсe #XX -- [ Pg.71 ]

See also in sourсe #XX -- [ Pg.71 ]

See also in sourсe #XX -- [ Pg.417 ]




SEARCH



2-Iodothiophene, reaction with terminal alkynes

3- Aminobenzo cycloaddition reactions with activated alkynes

3- benzoic acid reaction with alkynes

Acid chlorides, reaction with alkyne anions

Acids reaction with alkynes

Aldehydes, reaction with alkyne anions

Alkenes, reaction with alkynes

Alkenyl halides reaction with 1-alkynes

Alkylboranes reaction with alkynes

Alkylidyne complexes, reactions with alkyne

Alkyne anions reaction with alkyl halides

Alkyne anions reaction with aryl halides

Alkyne anions reaction with epoxides

Alkyne complexes exchange reactions with alkynes

Alkyne complexes reactions with donor ligands

Alkyne reaction with HBr

Alkyne reaction with NaNH

Alkyne reaction with lithium

Alkyne reactions with cobalt carbonyl complexes

Alkyne, reaction with metal hydride

Alkynes Diels-Alder reactions with

Alkynes allenyl complexes, reaction with

Alkynes conjugate reactions with nucleophiles

Alkynes coupling reactions with alkenyl bromides

Alkynes directive effects with reaction

Alkynes ene reaction with formaldehyde

Alkynes haloarenes, reaction with

Alkynes intramolecular reactions, with arenes

Alkynes mercuric acetate, reaction with

Alkynes other reactions associated with

Alkynes palladium-catalyzed reaction with alkenyl halides

Alkynes reaction with Dibal

Alkynes reaction with Grignard reagents

Alkynes reaction with HTIB

Alkynes reaction with alkoxycarbene complexes

Alkynes reaction with amines

Alkynes reaction with arenes

Alkynes reaction with azides

Alkynes reaction with boranes

Alkynes reaction with bromine

Alkynes reaction with carbene complexes

Alkynes reaction with carbenes

Alkynes reaction with carboxylic acids

Alkynes reaction with cuprates

Alkynes reaction with dicobalt octacarbonyl

Alkynes reaction with imides

Alkynes reaction with iodine

Alkynes reaction with nitrile oxides

Alkynes reaction with organocopper reagents

Alkynes reaction with ozone

Alkynes reaction with strong bases

Alkynes reaction with water

Alkynes reaction with, phosgene

Alkynes reactions with Fischer carbene complexes

Alkynes reactions with alcohols

Alkynes reactions with carbon monoxide

Alkynes reactions with halogens

Alkynes reactions with metal atoms

Alkynes reactions with nitrone

Alkynes reactions with organic halides

Alkynes, anions, reaction with

Alkynes, metal mediated reaction with

Alkynes, reaction with azadienes

Alkynes, reaction with catecholborane

Alkynes, reaction with chloroborane

Alkynes, reaction with dibromoborane

Alkynes, reaction with organolithium reagents

Alkynes, reaction with platinum complexes

Alkynes, reaction with pyrrole

Alkynes, reaction with pyrrole derivatives

Alkynes, reaction with thexylborane

Alkynes, reaction with vinyl bromides

Alkynes, reactions with carbonyl clusters

Alkynes, reactions with transition metal complexes

Alkynyl cyanides, reactions with alkynes

Allenes, bromocoupling reactions reaction with alkynes

Allenylidene reactions with alkynes

Allyl cyanides, reactions with alkyne

Aluminum reaction with alkynes

Aziridines reaction with alkynes

Bonds reaction with alkynes

Borane complexes reaction with alkynes

Borane reaction with alkynes

Borane, electrophilicity reaction with alkynes

Boranes chloride, reaction with alkynes

Boron hydride, reaction with alkynes

Butyllithium, reaction with alkynes

Carbenoids reactions with alkynes

Carbonyls reaction with alkynes

Carbyne complexes, reactions with alkyne

Cp2Mo2 with alkynes, reaction

Cross-coupling Reactions of Terminal Alkynes with Organic Halides

Cuprous salts, reaction with alkynes

Cycloadditions reactions with, alkenes alkynes

Cyclobutadienes reactions with alkynes

Cyclocotrimerizations of Alkynes with Other Unsaturated Molecules and Related Reactions

Dichlorocarbene, reactions with alkynes

Dicyclohexylborane, reaction with alkynes

Diselenides, reactions with alkynes

Disulphides, reactions with alkynes

Electrophiles alkyne reactions with

Enamines reactions with alkynic esters

Esters, alkynic reaction with allylic alcohols

Ethylmagnesium bromide reaction with alkynes

Gallium reactions with alkynes

Gold-Catalyzed Reaction of Indoles with Alkynes

Halides, alkyl reaction with alkynes

Halides, vinyl reaction with alkynes

Heck reaction with alkynes

Hydride, diisobutylaluminum reaction with alkynes

Hydrides reactions with alkynes

Imines reactions with alkynes

Iminium ions reactions with alkynes

Intramolecular Acylpalladation Reactions with Alkenes, Alkynes, and Related Unsaturated ompounds

Intramolecular Reactions with Alkenes and Alkynes

Iron compounds reactions with alkynes

Isocyanates, reaction with alkynes

Isoquinolines reaction with activated alkynes

Ketones, reaction with alkyne anions

Ketoximes. reaction with alkynes

Ketyls reactions with alkynes

LiAlH4, reaction with alkyne-alcohols

Mercuric salts, reaction with alkynes

Mercury reactions with alkynes

Metal-mediated Schmidt Reactions of Alkyl Azides with Alkenes and Alkynes

Metallacyclobutane complexes reactions with alkynes

Metallacyclopentadienes reactions with alkynes

Molybdenum complexes reaction with alkynes

Molybdenum reaction with alkynes

Niobium complexes reactions with alkynes

Nitrones reactions with alkynes

Octacarbonyldicobalt reactions with alkynes

Ozone, preparation reaction with alkynes

Pentacarbonyliron reactions with alkynes

Phenols reactions, alkyne derivatives with

Phosphines, reactions with alkynes

Pinacol coupling reactions with alkynes

Platinum reaction with alkynes

Pyrroles reaction with alkynes

Radicals, coupling reactions with alkynes

Reaction of Alkynes with Organic Halides

Reaction of Simple Aldehydes or Ketones with Alkynes

Reaction of alkynes with

Reaction with alkenes and alkynes

Reactions of Enones with Alkynes

Reactions of Enynes with Alkynes

Reactions of cyclic alkynes with metal compounds

Reactions with electron-deficient alkynes

Related reactions with alkynes

Samarium complexes reaction with alkynes

Sodium amide, reaction with alkynes

Sodium reaction with alkynes

Sulfur dichloride, reaction with alkynes

Tantalum complexes reactions with alkynes

Tellurium, reactions with alkynes

Triazines reaction with alkynes

Trifluoroacetic acid reaction with alkynes

Trifluoromethanesulfonic acid reaction with alkynes

Trithiazyl trichloride, reactions with alkynes

With alkynes

Zinc, bromo reaction with alkynes

© 2024 chempedia.info