摘要:
Die vorliegende Erfindung betrifft Schichtniobate der Formel HaAbSr2Nb3O10, wobei H für eine Gruppe steht, die die Elemente H+ und H3O+ umfasst und A für ein Element der Gruppe K+, Cs+ und Rb+ steht, mit 0,6 ≤ a ≤ 1 und 0 ≤ b ≤ 0,4, mit a+b = 1, die sich dadurch auszeichnen, dass sie unterschiedliche Schichtabstände aufweisen, ein Verfahren zu deren Herstellung sowie deren Verwendung in Photokatalysatoren.
摘要:
Functionalized amine derivatives are prepared by reacting an amine, a carbonyl derivative, and an organoboron compound under mild conditions. Organoboronic acids (4) react with amines (2) and alpha-hydroxy aldehydes (3) to give anti-alpha-amino alcohols (1) with very high diastereoselectivities (> 99 % de). When optically pure alpha-hydroxy aldehydes are used in this process, no racemization occurs and the products are obtained with very high enantioselectivities (> 99 % ee). The reaction also works with unprotected glyceraldehyde to give the corresponding amino diol derivatives, while unprotected carbohydrates give the corresponding amino polyols. The chiral amino alcohol products of this process or their derivatives, react further with metals or non-metals to give adducts that are effective catalysts for a variety of asymmetric reactions. Overall, the present invention relies on the facile synthesis of the chiral amino alcohol ligands for the rapid construction of combinatorial libraries of chiral catalysts. These libraries can then be used to identify the most suitable catalyst for a particular asymmetric transformation.
摘要:
The invention consists on the utilization of complexes of vanadium (in the +4 and +5 oxidation states) with bi- or poly-dentate ligands coordinated by nitrogen and oxygen (N,O) or by oxygen and oxygen (O,O) atoms, namely derivaties of aminoalcohols, (hydroxyimino)dicarboxylic acids, hydroxypyranones, trifluoroacetic acid, triflic acid or inorganic acid, as catalysts for the direct single-pot conversion, under mild conditions, of methane in acetic acid, either in the absence or in the presence of carbon monoxide, and in the presence of a peroxodisulfate salt (K2S2O8), in trifluoroacetic acid (CF3COOH), according to the general reaction (I).
摘要翻译:本发明包括利用钒(+4和+5氧化态)与通过氮和氧(N,O)或氧和氧(O,O)原子配位的双齿或多齿配体的配合物 ,即氨基醇,(羟基亚氨基)二羧酸,羟基吡喃酮,三氟乙酸,三氟甲磺酸或无机酸的衍生物,用作在温和条件下直接单釜转化甲烷在乙酸中的催化剂,无论是否存在或存在 根据一般反应(I),在一氧化碳存在下和在过氧二硫酸盐(K 2 S 2 O 8)存在下,在三氟乙酸(CF 3 COOH)中进行。
摘要:
The present invention provides Group 5 metal complexes useful for amine functionalization and synthetic process for manufacture thereof. Provided in this application are halo group 5 metal-amidate complexes having the structure of Formula I: I wherein: M is a group 5 metal, such as Ta, Nb or V; X is a halo substituent, such as CI, F, I or Br; n = 1 or 2,; s = 1 or 2; R 1 and R 2 are each independently H; a C 1 - C 25 substituted or unsubstituted, linear, branched or cyclic alkyl; or substituted or unsubstituted aryl or heterocyclic groups; R' is independently a C 1 - C 25 substituted or unsubstituted, linear, branched or cyclic alkyl; a substituted or unsubstituted aryl; a substituted or unsubstituted heterocyclic group; or NR 3 2 ; and each R 3 is independently a C 1 - C 25 substituted or unsubstituted, linear, branched or cyclic alkyl; a substituted or unsubstituted aryl; or substituted or unsubstituted heterocyclic group, and a process for synthesis thereof. Also provided are the corresponding metallaaziridine complexes. The metal complex of Formula I, and the corresponding metallaaziridine complex are useful as a catalysts in ct-alkylation of secondary amines and, therefore, also provided are methods of using the metal complex of Formula I, and the corresponding metallaaziridine complex in o-alkylation of secondary amines. This application also provides methods of using the corresponding non-halo group 5 metal-amidate complexes and metallaaziridine complexes in α-alkylation of heterocycles.
摘要:
The invention consists on the utilization of complexes of vanadium (in the +4 and +5 oxidation states) with bi- or poly-dentate ligands coordinated by nitrogen and oxygen (N,O) or by oxygen and oxygen (O,O) atoms, namely derivaties of aminoalcohols, (hydroxyimino)dicarboxylic acids, hydroxypyranones, trifluoroacetic acid, triflic acid or inorganic acid, as catalysts for the direct single-pot conversion, under mild conditions, of methane in acetic acid, either in the absence or in the presence of carbon monoxide, and in the presence of a peroxodisulfate salt (K2S2O8), in trifluoroacetic acid (CF3COOH), according to the general reaction (I).
摘要:
The invention relates to an optically active catalyst containing a salen ligand of formula (II) and vanadium at oxidation stage (IV), wherein the groups R, R' and R" of the salen ligand independently of one another represent hydrogen, branched or unbranched C1-C10 alkyl groups or an O(C1-C4-alkyl) group, or F, Cl, Br or l, an optionally substituted aryl group, or -(CH2)m-, whereby m represents a whole number ranging between 1 and 8 and the catalyst contains between 1.4 and 10 equivalents of a salen ligand for an equivalent of vanadium (IV). The catalyst is obtained by reacting a vanadyl-IV-salt with between 1.4 and 10 equivalents of the salen ligand and can be used for producing optically active cyanohydrins.
摘要:
Method of preparing epoxidation catalysts are disclosed, including methods comprising reacting an inorganic siliceous solid with a metal complex of the formulas: wherein the variables are defined herein.
摘要:
Provided herein a vanadium(V) complex of formula I, where R 1 to R 8 are as defined herein. Also provided herein are reactions making use of the vanadium(V) complex of formula I, such as selective sp 3 -sp 3 carbon-carbon bond cleavage under visible light photocatalysis and photodegradation of lignin.