Rhodium-Mediated Stereoselective Polymerization of “Carbenes”
نویسندگان
چکیده
منابع مشابه
Rhodium-mediated stereoselective polymerization of "carbenes".
Unprecedented rhodium-catalyzed stereoselective polymerization of "carbenes" from ethyl diazoacetate (EDA) to give high molecular mass poly(ethyl 2-ylidene-acetate) is described. The mononuclear, neutral [(N,O-ligand)M(I)(cod)] (M = Rh, Ir) catalytic precursors for this reaction are characterized by (among others) single-crystal X-ray diffraction. These species mediate formation of a new type o...
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New sterically encumbered N-heterocyclic carbene catalysts were synthesized and used to polymerize rac-lactide to give highly isotactic polylactide or meso-lactide to give heterotactic polylactide.
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A highly efficient and stereoselective arylation of in situ-generated azavinyl carbenes affording 2,2-diaryl enamines at ambient temperatures has been developed. These transition-metal carbenes are directly produced from readily available and stable 1-sulfonyl-1,2,3-triazoles in the presence of a rhodium carboxylate catalyst. In several cases, the enamines generated in this reaction can be cycl...
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N–heterocyclic carbenes (NHCs), first isolated by Arduengo et al. in 1991, have become a well-studied and well-utilized class of ligands in the field of transition metal-catalyzed reactions.1 Their proficiency in catalysis, variable electronic properties, and ease of translation into complex architectural structures have allowed for the development of unique reactivity and targeted selectivity....
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ژورنال
عنوان ژورنال: Journal of the American Chemical Society
سال: 2006
ISSN: 0002-7863,1520-5126
DOI: 10.1021/ja058722j