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Organocerium compounds addition reactions

Organocerium derivatives possess low basicity. 5-Pyrimidylcerium dichlorides (e.g., 904) are available via low-temperature metalmetal exchange using cerium trichloride and 5-lithiated pyrimidines. The 5-pyrimidinylcerium dichloride is superior to its 5-lithio analogue in addition reactions to aldehydes and ketones, especially in reactions when the carbonyl compound is enolizable. [Pg.362]

Addition of zinc(II) chloride to the lithium compound 4 gave the zinc derivative 6, which is stable even at 50 °C in tetrahydrofuran. The palladium-catalyzed coupling reaction of the zinc salt with vinyl iodides, vinyl triflates and aryl iodides produced vinyl and aryl derivatives 7 and 8 (Table 1, entries 11-16). Cerium derivatives of cyclopropenone acetals were prepared by addition of the lithium salt 4 to a suspension of anhydrous cerium(III) chloride in tetrahydrofuran at — 70 C. The resulting organocerium reagent coupled with oc-aminoaldehydes (Table 1, entry 17). ° ... [Pg.2994]


See other pages where Organocerium compounds addition reactions is mentioned: [Pg.1216]    [Pg.665]    [Pg.406]    [Pg.467]    [Pg.594]    [Pg.231]    [Pg.231]    [Pg.39]    [Pg.467]    [Pg.194]    [Pg.78]    [Pg.1447]    [Pg.217]    [Pg.217]    [Pg.188]    [Pg.75]    [Pg.123]    [Pg.66]    [Pg.217]    [Pg.231]    [Pg.647]   
See also in sourсe #XX -- [ Pg.99 , Pg.391 ]




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Addition reactions compounds

Organocerium compounds

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