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Cyclopropanes cyclopropanation

CIAMICIAN - DENNSTEDT Cyclopropanation Cyclopropanation of alkenes with dichlorocarbene derived Irom CHCI3 and sometimes subsequent rirtg enlargement of fused cyclopropanes 1 Na... [Pg.64]

Dibromo-2,2-bis(chloromethyl)cyclopropane Cyclopropane, 1,1-dibromo-2,2-bis(chloromethyl)- (11) (98577-44-7)... [Pg.200]

Keywords Absolute configuration. Amino acids, Bicyclopropylidene, Coupling reactions. Cycloadditions, Cyclopropanation, Cyclopropanes, Organolithium derivatives. Palladium catalysis. Radical reactions. Small ring polycycles, Spiro compounds. Strain energy. Sulfides... [Pg.89]

Conformational isomerism in cyclopropane Cyclopropane is the first member of the cycloalkane series, and composed of three carbons and six hydrogen atoms (CsHe). The rotation about C-C bonds is quite restricted in cycloalkanes, especially in smaller rings, e.g. cyclopropane. [Pg.39]

CH LORO-1-(TRICHLOROETHENYL)CYCLOPROPANE (Cyclopropane, l-chloro-l-(trichloroethenyl)-)... [Pg.144]

Cyclopropanation, Cyclopropanes can be prepared by reaction of olefins with 2 equiv. of this reagent in dioxane at reflux. The reaction is stereospeciflc. Examples ... [Pg.378]

The action of metals on 1,3-dihalides is an important method of ring closure for cyclopropanes. Cyclopropane is made by the action of zinc dust at 125° on an acetamide solution of 1,3-dichloropropane. A small amount of sodium iodide is used as a catalyst, and sodium carbonate is added to regenerate iodide ions from the precipitated zinc iodide." Zinc dust in aqueous ethanol is employed in the preparation of 1,1-dialkyl-cyclopropanes from the corresponding 1,3-dibromides and spiropentane from pent aery thrityl tetrabromide." ... [Pg.10]

Synthesis of cyclopropanes. Cyclopropanes can be synthesized in fair yield by the reaction of an olefin with an a-chloro compound catalyzed by coppcr(I) oxide t-butyl isonitrile. [Pg.101]

Gant and Yang studied the decay of gaseous T2 in cyclopropane (cyclopropane pressure more than 100 times that of T2). The main products are tritiated cyclopropane, propane, propene, ethylene, ethane and acetylene. Table 7 gives the yields of the main products as fractions from the number of tritium atoms, incorporated into these compounds. [Pg.904]

Functionalized chiral ( )-crotylsilane 42, bearing a primary hydroxy group, underwent dia-stereoselective cyclopropanation with the trimethylaluminum/diiodomethane mixture to give the ann-isomer in major amounts. The substituted alcohols 42b,c (R = Me, Bn) showed greater selectivity in the cyclopropanation. Cyclopropanation carried out on the silyl ether proceeded nonselectively (1.5 1, antifsyn). The cyclopropanes obtained are used as precursors for substituted tetrahydrofurans. ... [Pg.274]

See other pages where Cyclopropanes cyclopropanation is mentioned: [Pg.537]    [Pg.537]    [Pg.537]    [Pg.149]    [Pg.108]    [Pg.27]    [Pg.126]    [Pg.123]    [Pg.253]    [Pg.272]    [Pg.29]    [Pg.597]    [Pg.137]    [Pg.101]    [Pg.1172]    [Pg.281]    [Pg.281]    [Pg.3547]    [Pg.3548]    [Pg.3549]    [Pg.3550]    [Pg.3552]    [Pg.106]    [Pg.314]    [Pg.62]    [Pg.319]   


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