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Allylic alkenes

A modern variant is the intramolecular magnesium-ene reaction, e.g. the reaction of the alkene-allylic-Grignard compound 9 to give the five-membered ring product 10. This reaction proceeds regio- and stereoselectively, and is a key step in a synthesis of the sesquiterpenoid 6-protoilludene ... [Pg.105]

Preparing Alkyl Halides from Alkenes Allylic Bromination 339... [Pg.339]

There are several reagents that lead to isomerization of a double bond to form a new alkene. Allyl decyl ether (CH2=CHCH20CioH2i) was isomerized to 1-decyloxy-l-propene (CH3CH=CHOCioH2i) by treatment with NaHFe(CO)4. Many of these reactions were discussed in 12-2. [Pg.991]

The extensive organometallic chemistry of chromium, i.e. the hexacarbonyl and its derivatives, organochromium compounds without carbonyl ligands, cyanide and isocyanide complexes, alkene, allyl, diene, cyclopentadiene and arene derivatives, and complexes of a-donor carbon ligands, has been recorded in Chapters 26.1 and 26.2 of Volume 3 of Comprehensive Organometallic Chemistry .1 In the present section, chromium complexes... [Pg.702]

The reactivity of -Tr-allylpalladium-phosphine complexes generated stoichiometrically or from alkenes allylically substituted with a leaving group, is essentially identical and, as a result, allyl species will be generally considered in this section without distinction as to the origin of the palladium complex. [Pg.590]

Sulfur nucleophiles have not been widely used in ir-allylpalladium chemistry, principally due to their ability to interfere with the catalyst by coordination. This is a less serious concern for sulfinic acid and sulfinate salts than with sulfides, and as a result, several reports have appeared using RSO2H and RSO2-.211-219 Alkenes allylically functionalized with a leaving group, dienes214 and vinyl nitro con-pounds218 219 have all served as precursors for the required ir-allyl species in these reactions (equations 60 and 61). [Pg.599]

In contrast with unreactive, unfunctionalised terminal alkenes, allylic and homoallylic ethers (22, 24) and alcohols (20) from which the product organolithiums (21, 23, 25) can be chelated in a (preferably) five-membered, oxygen-containing ring, carbolithiate rapidly and cleanly.23 Coordination overrides any preference for the lithium to be bonded to the primary carbon, but cannot overcome the unfavourability of forming a tertiary organolithium - 26 gives 27, but 28 cannot be carbolithiated. Coordination to sulfur in similar thioethers 29 works too. [Pg.276]

Chloriuatton of alkenes, Allylic chlorination is usually conducted by a free-radical reaction with NCS. Chlorination can be effected with catalysis by C6H5SeCl, in which case the main product is usually the rearranged allylic chloride. However, the formation of rearranged allylic chloride is sensitive to the structure of the alkenes and also to the particular selenium compound used as catalyst. See also N-phenylselenosuccinimide, this volume. [Pg.362]

On the other hand, the pure (Z)-isomer of 1 on treatment with sec-butyllithium in THF generates the more susbstituted vinyllithium reagent 3. Thus by use of either sequence stereoselective routes are possible to alkenes, allylic aldbhols, and aldehydes. ... [Pg.550]

The reaction of alkenes with iodosobenzene in acetic acid in the presence of sodium azide offers a simple and high yield route to 1,2-diazides (Table 3)76. a-Azido ketones are side products or the exclusive product from the reaction with conjugated alkenes. Allylic azides or oxonitriles, resulting from oxidative cleavage of the C-C double bond, are alternatively obtained from trisubstituted steroid alkenes77. [Pg.709]

D. (T-Carbene, Ciirbyne/7r-Alkene, Allyl. and Alkyne Complexes. . . 266... [Pg.219]

Alkenyllithiums generated from trisylhydrazones react with electrophiles such as primary alkyl bromides, aldehydes, ketones, dimethylformamide, CO2, chloro-trimethylsilane, or 1,2-dibromoethane to furnish substituted alkenes, allylic alcohols, a,(3-unsaturated aldehydes, a,P-unsaturated acids, alkenylsilanes, or alkenyl bromides, respectively, as exemplified below for the preparation of an allylic alcohol and an a,P-unsaturated aldehyde. ... [Pg.389]

THA4(Cr0)PWu039 THA,5(Cr0)SiW11039 Alkene Alkene Allylic alcohol Triphenylphosphine Epoxide, allylic alcohol, allylic ketone Epoxide, allylic alcohol, allylic ketone Allylic ketone Triphenylphosphine oxide MeCN or C6H6 MeCN or C6H6 MeCN c6h6 ... [Pg.718]

Into Alkenes, Allyl Alcohols, and a,P-Unsaturated Ketones (Decyanation Reaction)... [Pg.15]


See other pages where Allylic alkenes is mentioned: [Pg.767]    [Pg.115]    [Pg.46]    [Pg.141]    [Pg.366]    [Pg.116]    [Pg.531]    [Pg.747]    [Pg.345]    [Pg.588]    [Pg.41]    [Pg.366]    [Pg.190]    [Pg.649]    [Pg.51]    [Pg.46]    [Pg.173]    [Pg.247]    [Pg.42]    [Pg.104]    [Pg.847]    [Pg.958]   
See also in sourсe #XX -- [ Pg.1116 ]

See also in sourсe #XX -- [ Pg.557 , Pg.558 ]

See also in sourсe #XX -- [ Pg.525 , Pg.526 ]




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Acetoxylation of Alkenes to Vinyl or Allyl Acetates

Alcohols, allylic from alkene sulfoxides

Aldehyde-alkene => allyl thioethers

Aldehyde-alkene => allyl vinyl ethers

Aldehyde-alkenes => allylic

Alkene Insertions with Nickel-Allyl Complexes

Alkene derivatives allylation reactions

Alkene derivatives allylic reaction

Alkene ketones from allyl vinyl ethers

Alkenes allyl alcohol derivatives

Alkenes allyl alcohols

Alkenes allyl ethers

Alkenes allyl halides

Alkenes allyl intermediates

Alkenes allyl substitution

Alkenes allyl/homoallyl alcohols

Alkenes allylations, allyltrimethylsilane

Alkenes allylic acetoxylation

Alkenes allylic acetoxylations, palladium acetate

Alkenes allylic alcohols

Alkenes allylic alcohols, palladium acetate

Alkenes allylic bromination

Alkenes allylic dihydroxylation

Alkenes allylic halogenation

Alkenes allylic oxidation

Alkenes allylic radical bromination

Alkenes allylic silanes

Alkenes allylic stannanes

Alkenes and allyl alcohols

Alkenes chromium reagents, allylic

Alkenes continued) allylic

Alkenes copper reagents, allylic

Alkenes cyclic allylic acetates

Alkenes from allylic acetates

Alkenes from allylic alcohols

Alkenes from allylic esters

Alkenes from allylic ethers

Alkenes from allylic halides

Alkenes from allylic substitution

Alkenes from allylic tosylates

Alkenes into allylic esters

Alkenes reductive coupling with allyl halides

Alkenes, allylic reaction with palladium

Alkenes, allylic reaction with selenium dioxide

Alkenes, cyclic => allylic alcohols

Allyl anions alkene

Allyl cation cycloaddition with alkenes

Allyl cross metathesis with alkenes

Allyl-substituted alkenes, diastereoselective epoxidations

Allylation of Unactivated Alkynes and Alkenes

Allylic Bromination of Alkenes

Allylic alcohols cross-coupling with alkenes

Allylic bromides, from alkenes

Allylic bromides, from alkenes isomerization

Allylic from alkenes

Allylic from simple alkenes

Allylic oxidation of alkenes

Allylic oxidation, of alkenes, with

Allylic oxidations alkenes, manganese acetate

Allylically heterosubstituted alkenes

Aromatic alkenes allylic alcohols

Asymmetric Epoxidation of Alkenes other than Allyl Alcohols

Borane hydration of alkenes enantioselective allylation with

Cleavage of the Allylic Bond in Aliphatic Alkenes

Conjugated alkenes allylic systems

Cyclic alkenes => allylic halides

Ethers, allyl vinyl via Wittig-type alkenation

Hydroboration allylic alkenes, functionalized

Lactones with Endocyclic Allylic Alkenes

Metallation of Alkenes, Dienes, and Polyenes at the Allylic Position

Preparing Alkyl Halides from Alkenes Allylic Bromination

Selenoxides in conversion of alkenes to allylic alcohols

Sulfinic acids, allylic to terminal alkenes

Unactivated alkenes, allylation

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