109 research outputs found
執筆者紹介
Get PDFAlkyne-dicobalthexacarbonyl complexes are readily prepared by the reduction of cobalt bromide by Zn in the presence of alkynes in THF while bubbling carbon monoxide under ambient conditions. The complexes prepared in this way react with olefins to give the corresponding Pauson-Khand cyclopentenones in moderate to good yields. The alkyne-dicobalthexacarbonyl complexes can be also prepared in situ by the reduction of cobalt bromide with sodium naphthalene under CO atmosphere followed by CuBr treatment in the presence of alkynes. The complexes prepared in this way also give cyclopentenones on heating with norbornene, but the former method utilizing zinc gives better results
ChemInform Abstract: Preparation of Polyfunctional Ketones by a Cobalt(II)-Mediated Carbonylation of Organozinc Reagents.
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ChemInform Abstract: Simple Syntheses of Co2(CO)8 and NaCo(CO)4 Reagents by the Reduction of CoCl2 (or CoBr2) Under Carbon Monoxide at Atmospheric Pressure.
No full textChemInform Abstract: Preparation and Reactions of Diorganozincs from Dienic Silyl Enol Ethers.
No full textChemInform Abstract: A New Nickel-Catalyzed Cross-Coupling Reaction Between sp3 Carbon Centers.
No full textA simple, direct synthesis of Na<SUB>2</SUB>Fe(CO)<SUB>4</SUB>
No full textReduction of anhydrous FeCl<SUB>3 </SUB>in THF with sodium naphthalenide under a CO atmosphere at room temperature leads directly to Na<SUB>2</SUB>Fe(CO)<SUB>4</SUB>, which on reaction with alkyl bromides gives the corresponding aldehydes, ketones and carboxylic acids under appropriate conditions
ChemInform Abstract: A Simple Convenient Synthesis of Alkyne-Co2(CO)6 Complexes and Their Utilization in the Pauson-Khand Cyclopentenone Synthesis.
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