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

86853

Supelco

Tetrabutylammonium bisulfate, suitable for ion pair chromatography, LiChropur^™, ≥99.0%

86854

Supelco

Tetrabutylammonium hydroxide solution, ~40% in water, suitable for ion chromatography

86893

Supelco

Tetrabutylammonium perchlorate, for electrochemical analysis, ≥99.0%

86868

Sigma-Aldrich

Tetrabutylammonium bisulfate, puriss., ≥99.0% (T)

86880

Sigma-Aldrich

Tetrabutylammonium hydroxide solution, technical, ~40% in H₂O (~1.5 M)

230189

Sigma-Aldrich

Tetrabutylammonium hydroxide solution, 1.0 M in methanol

358665

Sigma-Aldrich

Tetrabutylammonium cyanide, 95%

86863

Sigma-Aldrich

Tetrabutylammonium hydroxide solution, 53.5-56.5% in H₂O

178780

Sigma-Aldrich

Tetrabutylammonium hydroxide solution, 40 wt. % in H₂O

86885

Sigma-Aldrich

Tetrabutylammonium perchlorate, ≥95.0% (T)

79989

Sigma-Aldrich

Tetrabutylammonium cyanide, technical, ≥80%

268100

Sigma-Aldrich

Tetrabutylammonium phosphate monobasic solution, 1.0 M in H₂O

155837

Sigma-Aldrich

Tetrabutylammonium hydrogensulfate, 97%

98479

Supelco

Tetrabutylammonium bisulfate solution, suitable for ion pair chromatography, LiChropur^™, concentrate, ampule

86903

Supelco

Tetrabutylammonium iodide, suitable for ion pair chromatography, LiChropur^™, ≥99.0%

86852

Supelco

Tetrabutylammonium chloride, suitable for ion pair chromatography, LiChropur^™, ≥99.0%

86857

Supelco

Tetrabutylammonium bromide, suitable for ion pair chromatography, LiChropur^™, ≥99.0%

86833

Sigma-Aldrich

Tetrabutylammonium phosphate monobasic, puriss., 99% (T)

361399

Sigma-Aldrich

Tetrabutylammonium fluoride solution, 75 wt. % in H₂O

651664

Sigma-Aldrich

Tetrabutylammonium azide

140775

Sigma-Aldrich

Tetrabutylammonium iodide, reagent grade, 98%

86870

Sigma-Aldrich

Tetrabutylammonium chloride, ≥97.0% (NT)

86890

Sigma-Aldrich

Tetrabutylammonium iodide, ≥99.0% (AT)

72453

Sigma-Aldrich

Tetrabutylammonium bisulfate solution, ~55% in H₂O

359173

Sigma-Aldrich

Tetrabutylammonium nitrate, 97%

426288

Sigma-Aldrich

Tetrabutylammonium bromide, ACS reagent, ≥98.0%

216143

Sigma-Aldrich

Tetrabutylammonium fluoride solution, 1.0 M in THF

193119

Sigma-Aldrich

Tetrabutylammonium bromide, ReagentPlus^®, ≥99.0%

462144

Sigma-Aldrich

Tetrabutylammonium bromide solution, 50 wt. % in H₂O