摘要:
The present invention relates to chiral diphosphinoterpenes and transition metal complexes thereof, to a process for preparing chiral diphosphinoterpenes and oxides thereof, and to transition metal complexes comprising the chiral diphosphinoterpenes. In a further aspect, the invention relates to the use of the chiral diphosphinoterpenes or transition metal complexes thereof in asymmetric syntheses.
摘要:
The present invention relates to chiral diphosphorus compounds and transition metal complexes thereof, to a process for preparing chiral diphosphorus compounds and oxides thereof, and transition metal complexes comprising the chiral diphosphorus compounds. In a further aspect, the invention relates to the use of the chiral diphosphorus compounds or transition metal complexes thereof in asymmetric syntheses.
摘要:
The present invention relates to chiral diphosphinoterpenes and transition metal complexes thereof, to a process for preparing chiral diphosphinoterpenes and oxides thereof, and to transition metal complexes comprising the chiral diphosphinoterpenes. In a further aspect, the invention relates to the use of the chiral diphosphinoterpenes or transition metal complexes thereof in asymmetric syntheses.
摘要:
The present application discloses a process for preparing a compound of the general formula R1-M1-Ad.zLiX (I) by reacting a compound R1-A (III) with an element M1 in the presence of lithium salts. The application also discloses a process for preparing a compound of the general formula R1m-M3-Tm.zLiX (II) by reacting a compound R1-A (III) with an M3-containing compound in the presence of lithium salts and in the presence of an elemental metal M2. The metal M3 may be selected from Al, Mn, Cu, Zn, Sn, Ti, In, La, Ce, Nd, Y, Li, Sm, Bi, Mg, B, Si and S.
摘要:
There is described a process for the enantioselective alkylation of aldehydes by means of organozinc compounds, of which a ligand of the zinc is transferred to the aldehyde, and the other ligand acts as so-called dummy ligand. As novel substances there are used zinc-organic compounds, which contain the neophyl residue as dummy ligand.
摘要:
The present application relates to mixed Mg/Li amides of the general formula R1R2N—Mg—NR3R4.zLiY (II) wherein R1, R2, R3, and R4 are, independently, selected from H, substituted or unsubstituted aryl or heteroaryl containing one or more heteroatoms, linear, branched or cyclic, substituted or unsubstituted alkyl, alkenyl, alkynyl, or silyl derivatives thereof; and R1 and R2 together, or R3 and R4 together can be part of a cyclic or polymeric structure; and wherein at least one of R1 and R2 and at least one of R3 and R4 is other than H; Y is selected from the group consisting of F; Cl; Br; I; CN; SCN; NCO; HaIOn, wherein n=3 or 4 and Hal is selected from Ci, Br and I; NO3; BF4; PF6; H; a carboxylate of the general formula RxCO2; an alcoholate of the general formula ORx; a thiolate of the general formula SRx; RxP(O)O2; or SCORx; or SCSRx; OnSRx, wherein n=2 or 3; or NOn, wherein n=2 or 3; and a derivative thereof; wherein RX is a substituted or unsubstituted aryl or heteroaryl containing one or more heteroatoms, linear, branched or cyclic, substituted or unsubstituted alkyl, alkenyl, alkynyl, or derivatives thereof, or H; m is O or 1; and z>1; as well as a process for the preparation of the mixed Mg/Li amides and the use of these amides, e.g. as bases.
摘要:
Aqueous dispersions comprising a polyurethane composed of a) diisocyanates, b) diols of which b1) from 10 to 100 mol %, based on the total amount of diols (b), have a molecular weight of from 500 to 5000, and b2) from 0 to 90 mol %, based on the total amount of diols (b), have a molecular weight of from 60 to 500 g/mol, c) monomers other than the monomers (a) and (b), containing at least one isocyanate group or at least one isocyanate-reactive group and further carrying at least one hydrophilic group or potentially hydrophilic group by means of which the polyurethane is made dispersible in water, d) if desired, further, polyfunctional compounds other than the monomers (a) to (c), containing reactive groups which are alcoholic hydroxyl groups, primary or secondary amino groups or isocyanate groups, and e) if desired, monofunctional compounds which are other than the monomers (a) to (d) and contain a reactive group which is an alcoholic hydroxyl group, a primary or secondary amino group or an isocyanate group, obtainable by reacting the monomers a), b), c), and, where used, d) and e) in the presence of a cesium salt.
摘要:
The invention relates to bidentate organophosphorous ferrocenyl ligands containing ligands of formula (I), to their complex compounds and to their utilization in catalytic processes.
摘要:
Processes for making an organozinc reagents are disclosed comprising reacting (A) organomagnesium or organozinc complexes with (B) at least one coordination compound comprising one or more carboxylate groups and/or alcoholate groups and/or tertiary amine groups, optionally in combination with zinc ions and/or lithium ions and/or halide ions, wherein the halide ions are selected from chloride, bromide and iodide, the organozinc complex comprises an aryl group, a heteroaryl group or a benzyl group when the coordinating compound is a chelating polyamine, and the reaction is conducted in the presence of zinc complexed with at least one coordinating compound when reactant (A) comprises at least one organomagnesium complex. The resulting organozinc reagents may optionally be isolated from solvents to obtain a solid reagent. The reagents may be used for making organic compounds via Negishi cross-coupling reactions or via aldehyde and/or ketone oxidative addition reactions. The organozinc reagents are stable and, due to their high selectivity, permit maintenance of sensitive functional groups such as aldehydes during cross-coupling.