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Efficient generation and increased reactivity in cationic gold via Brønsted acid or Lewis acid assisted activation of an imidogold precatalyst.

Efficient generation and increased reactivity in cationic gold via Brønsted acid or Lewis acid assisted activation of an imidogold precatalyst.

Organic letters (2014-06-24)

Junbin Han, Naoto Shimizu, Zhichao Lu, Hideki Amii, Gerald B Hammond, Bo Xu

ABSTRACT

Brønsted or Lewis acid assisted activation of an imidogold precatalyst (L-Au-Pht, Pht = phthalimide) offers a superior way to generate cationic gold compared with the commonly used silver-based system. It is also broadly applicable for most common gold-catalyzed reactions. For reactions that require milder conditions, milder acids can be used for optimized efficiency.

MATERIALS

Product Number

Brand

Product Description

Sigma-Aldrich

Silver, foil, thickness 1.0 mm, 99.99% trace metals basis

Sigma-Aldrich

Silver, conductive paste

Sigma-Aldrich

Silver, nanopowder, <150 nm particle size, 99% trace metals basis

Sigma-Aldrich

Silver, wool, diam. 0.05 mm, ≥99.9% trace metals basis

Sigma-Aldrich

Silver, foil, thickness 0.1 mm, 99.9% trace metals basis

Sigma-Aldrich

Silver, powder, <250 μm, 99.99% trace metals basis

Sigma-Aldrich

Silver, wire, diam. 0.1 mm, 99.9% trace metals basis

Sigma-Aldrich

Gold, powder, <45 μm, 99.99% trace metals basis

Sigma-Aldrich

Silver, shot, 1-3 mm, ≥99.99% trace metals basis

Sigma-Aldrich

Silver, wire, diam. 1.0 mm, ≥99.99% trace metals basis

Sigma-Aldrich

Silver, wire, diam. 0.127 mm, 99.99% trace metals basis

Sigma-Aldrich

Silver, wire, diam. 1.0 mm, 99.9% trace metals basis

Sigma-Aldrich

Silver, foil, thickness 2.0 mm, 99.9% trace metals basis

Sigma-Aldrich

Silver, wire, diam. 0.5 mm, ≥99.99% trace metals basis

Sigma-Aldrich

Silver, colloidal, 65-75% Ag basis

Silver, foil, 25x25mm, thickness 0.5mm, as rolled, 99.99+%

Silver, foil, 10mm disks, thickness 0.20mm, as rolled, 99.95+%

Silver, foil, 150x150mm, thickness 0.25mm, as rolled, 99.95+%

Silver, foil, 25x25mm, thickness 0.125mm, as rolled, 99.95+%

Silver, foil, 0.5m coil, thickness 0.15mm, as rolled, 99.95+%

Silver, foil, 10mm disks, thickness 0.125mm, as rolled, 99.99+%

Silver, foil, 10mm disks, thickness 0.008mm, 99.95+%

Silver, foil, 150x150mm, thickness 0.20mm, as rolled, 99.95+%

Silver, foil, 10mm disks, thickness 1.0mm, as rolled, 99.99+%

Silver, foil, 6mm disks, thickness 0.0025mm, 99.97%

Silver, foil, light tested, 100x100mm, thickness 0.02mm, 99.97%

Silver, foil, 6mm disks, thickness 0.008mm, 99.97%

Silver, foil, 8mm disks, thickness 0.007mm, 99.97%

Silver, foil, 8mm disks, thickness 0.035mm, as rolled, 99.95+%

Silver, foil, 6mm disks, thickness 0.5mm, as rolled, 99.95+%