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  • A highly negatively charged γ-Keggin germanodecatungstate efficient for Knoevenagel condensation.

A highly negatively charged γ-Keggin germanodecatungstate efficient for Knoevenagel condensation.

Chemical communications (Cambridge, England) (2012-07-14)
Kosei Sugahara, Toshihiro Kimura, Keigo Kamata, Kazuya Yamaguchi, Noritaka Mizuno
ABSTRACT

A tetra-n-butylammonium (TBA) salt of a γ-Keggin -6-charged germanodecatungstate, [γ-H(2)GeW(10)O(36)](6-) (I), could act as an efficient homogeneous catalyst for Knoevenagel condensation of active methylene compounds with carbonyl compounds.

MATERIALS
Product Number
Brand
Product Description

Sigma-Aldrich
Tetrabutylammonium cyanide, technical, ≥80%
Sigma-Aldrich
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Tetrabutylammonium hydroxide solution, technical, ~40% in H2O (~1.5 M)
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Tetrabutylammonium chloride, suitable for ion pair chromatography, LiChropur, ≥99.0%
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Tetrabutylammonium bisulfate solution, ~55% in H2O
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