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Danh H. Cao

Bio: Danh H. Cao is an academic researcher from Wayne State University. The author has contributed to research in topics: Ruthenocene & Cyclopentadiene. The author has an hindex of 3, co-authored 4 publications receiving 61 citations.

Papers
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Journal ArticleDOI
TL;DR: In this paper, the reactivity of hydrated ruthenium trichloride with cyclopentadienes toward silylated cyclopents was investigated and shown to be 85-96% isolated yields.
Abstract: The reactivity of hydrated ruthenium trichloride and hydrated rhodium trichloride toward silylated cyclopentadienes was investigated. Treatment of ruthenium trichloride with (trimethylsilyl)cyclopentadiene, bis(trimethylsilyl)cyclopentadiene, or tris(trimethylsilyl)cyclopentadiene in alcohol solvents afforded ruthenocene in 85-96% isolated yields

16 citations

Journal ArticleDOI
TL;DR: The reaction of hydrated ruthenium trichloride with mono-, bis-and tris-(trimethylsilyl)cyclopentadiene in alcohol solvents leads to high yields of ruthensocene.
Abstract: The reaction of hydrated ruthenium trichloride with mono-, bis- and tris-(trimethylsilyl)cyclopentadiene in alcohol solvents leads to high yields of ruthenocene; these processes proceed through an unprecedented chloride ion-induced desilylation of the silylated Cyclopentadienes followed by reaction of RuIII ion with cyclopentadiene, rather than the mechanistically distinct carbon–silicon bond cleavage that has been observed in other transition metal halide systems.

7 citations

Journal ArticleDOI
TL;DR: The reaction of hydrated ruthenium trichloride with mono-, bis-and tris-(trimethylsilyl)cyclopentadiene in alcohol solvents leads to high yields of ruthensocene as discussed by the authors.
Abstract: The reaction of hydrated ruthenium trichloride with mono-, bis- and tris-(trimethylsilyl)cyclopentadiene in alcohol solvents leads to high yields of ruthenocene; these processes proceed through an unprecedented chloride ion-induced desilylation of the silylated Cyclopentadienes followed by reaction of RuIII ion with cyclopentadiene, rather than the mechanistically distinct carbon–silicon bond cleavage that has been observed in other transition metal halide systems.

Cited by
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Journal ArticleDOI
TL;DR: In this article, a new range of metallocene catalysts, Cp 2 MCl 2 (M = Ti, Zr, Hf) has been developed in the past decade, which, in the presence of alumoxanes are highly efficient at polymerizing α-olefins (ethene, propene, etc.).

464 citations

Journal ArticleDOI
TL;DR: Vicinal diarylphosphinites derived from carbohydrates are excellent ligands for the Rh(I)-catalyzed enantioselective asymmetric hydrogenation of dehydroamino acid derivatives.
Abstract: Vicinal diarylphosphinites derived from carbohydrates are excellent ligands for the Rh(I)-catalyzed enantioselective asymmetric hydrogenation of dehydroamino acid derivatives, producing the highest enantioselectivity of any ligands directly prepared from natural products. The enantioselectivity can be enhanced by the appropriate choice of substituents on the aromatic rings of the phosphinites. For example, the use of phosphinites with electron-donating bis(3,5-dimethylphenyl) groups on phosphorus provides ee's up to 99% for a wide range of amino acids including some with easily removable N-protecting groups. Electron-withdrawing aryl substituents, on the other hand, decrease the enantioselectivity. Sense of chiral induction in the amino acid product depends on the relative juxtaposition of the vicinal diphosphinites on a given sugar backbone. When readily available d-glucopyranosides are used as the starting sugars, 2,3-phosphinites give the S-amino acids and 3,4-phosphinites give the R-amino acids. In th...

200 citations

Journal ArticleDOI
TL;DR: In this paper, the synthesis and characterization of the C2v symmetric (dimethylsilanediylbis(9-fluorenyl))zirconium dichloride (I) and DSSI dimethyl (II) are reported.

137 citations

Journal ArticleDOI
TL;DR: In this article, a dinuclear (electron-deficient η5-cyclopentadienyl) rhodium(III) complex was synthesized on a preparative scale via the cyclotrimerization of silylacetylenes and two alkynyl esters.
Abstract: A dinuclear (electron-deficient η5-cyclopentadienyl)rhodium(III) complex was synthesized on a preparative scale via the rhodium-catalyzed cross [2+2+1] cyclotrimerization of silylacetylenes and two alkynyl esters, leading to substituted silylfulvenes, followed by reductive complexation with rhodium(III) chloride in ethanol. The thus obtained dinuclear (electron-deficient η5-cyclopentadienyl)rhodium(III) complex is a highly active precatalyst for the oxidative annulation of anilides with internal alkynes under ambient conditions (at room temperature under air). A preference for annulation across electron-rich substrates over electron-deficient substrates was observed using this electron-deficient rhodium(III) complex.

116 citations