Mejia-Oneto, Jose M.; Padwa, Albert published the article 《Ligand effects in the Rh(II) catalyzed reaction of α-diazo ketoamides》. Keywords: methanoazepinedione preparation byproduct rhodium catalyzed tandem cyclization cycloaddition; polycycle stereoselective preparation rhodium catalyzed tandem cyclization cycloaddition; dependence chemoselectivity rhodium catalyzed reaction diazo compound ligand; alpha diazo ketoamide rhodium catalyzed intramol tandem cyclization cycloaddition.They researched the compound: Dirhodium(II) tetrakis(caprolactam)( cas:138984-26-6 ).Related Products of 138984-26-6. Aromatic heterocyclic compounds can be divided into two categories: single heterocyclic and fused heterocyclic. In addition, there is a lot of other information about this compound (cas:138984-26-6) here.
Dirhodium tetracarboxylate or tetracarboxamide complexes act as catalysts for reactions of α-diazoesters containing amides and pendant alkenes or heterocycles such as I to give either polycycles such as II or methanoazepinediones such as III depending on the ligands present in the rhodium catalysts. In the presence of dirhodium tetrapivaloate, I undergoes intramol. cyclocondensation followed by [3+2] cycloaddition through a carbonyl ylide intermediate to give II as the sole product in 98% yield. In the presence of dirhodium tetrakis(heptafluorobutanoate), reaction of I yields both II in 62% yield and III (likely derived from via C-H insertion of I followed by dealkoxycarboxylation of the intermediate) in 32% yield. Other dirhodium compounds catalyze the intramol. cycloaddition of I to provide II and III with varying levels of chemoselectivity. In the presence of dirhodium tetrapivaloate, the thiophene containing substrate IV undergoes carbonyl ylide formation and intramol. cycloaddition to give the polycycle V in 35% yield, indicating that tethered thiophenes can also undergo tandem cyclization-cycloaddition reactions.
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Highly efficient and robust molecular ruthenium catalysts for water oxidation,
Catalysts | Special Issue : Ruthenium Catalysts – MDPI