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1 article(s) from Omedes-Pujol, Marta

Kinetics and mechanism of vanadium catalysed asymmetric cyanohydrin synthesis in propylene carbonate

Michael North and
Marta Omedes-Pujol

Beilstein J. Org. Chem. 2010, 6, 1043–1055, doi:10.3762/bjoc.6.119

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Scheme 1: Synthesis and transformation of nonracemic silyl-protected cyanohydrins.

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Figure 1: Highly active metal(salen) complexes for asymmetric cyanohydrin synthesis.

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Scheme 2: Synthesis of cyclic carbonates.

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Scheme 3: Synthesis of cyanohydrin trimethylsilyl ethers and acetates.

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Scheme 4: Equilibrium between bimetallic and monometallic Ti(salen) complexes.

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Figure 2: Second-order kinetics plot for the addition of TMSCN to benzaldehyde at 0 °C catalysed by complex 2...

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Figure 3: Plot of k_2obs against [2], showing that the reactions are first order with respect to the concentratio...

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Figure 4: Eyring plot to determine the activation parameters for catalyst 2 in propylene carbonate. The red a...

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Figure 5: ⁵¹V NMR spectra of complex 2 recorded at 50 °C. a) Spectrum in CDCl₃; b) spectrum in CDCl₃ with 500...

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Figure 6: Structures consistent with the ⁵¹V NMR spectra.

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Figure 7: Bimetallic aluminium(salen) complex for asymmetric cyanohydrin synthesis.

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Figure 8: Rate determining transition states for asymmetric cyanohydrin synthesis: a) when Lewis base catalys...

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Figure 9: Hammett correlations with catalyst 2 at 0 °C. Data in red are obtained in dichloromethane [52], whilst ...

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Published 03 Nov 2010

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