13134-13-9Relevant academic research and scientific papers
Reactive N-protonated isocyanate species stabilized by bis(μ-hydroxo) divanadium(IV)-substituted polyoxometalate
Uehara, Kazuhiro,Fukaya, Keisuke,Mizuno, Noritaka
experimental part, p. 7715 - 7718 (2012/09/05)
O- or N-protonated? The bis(μ-hydroxo)divanadium(IV)-substituted γ-Keggin-type polyoxometalate (see picture, left) (TBA) 4[γ-SiVIV2W10O 36(μ-OH)4] (TBA=tetra(n-butyl)ammonium) was synthesiz
1,4,2-Diazaphospholidine-3,5-diones and related compounds: A lecture on unpredictability in catalysis
Richter, Frank U.
supporting information; experimental part, p. 5200 - 5202 (2009/12/24)
1,4,2-diazaphospholidine-3,5-diones and related compounds and unpredictability in catalysis was studied. The five-membered ring species 4 6, which are all readily accessible by the McCormack reaction, optionally with subsequent hydrogenation, were selected for this study. The use of saturated species of type 4 (1-organyl-phospholanes) as catalysts led to a complete reverse in the selectivity of the reaction, in favor of the formation of the isocyanate trimers. Owing to the high activity of the corresponding P-oxides in carbodiimidization reactions, it can be assumed that the findings can be attributed to partial air oxidation of the trivalent phosphorus species applied. The symmetrical species 6, in total contrast to the other two members of the series, do not exhibit any catalytic activity with respect to isocyanates and instead react cleanly with two equivalents of isocyanate to effect the extrusion of 1,3-diene.
