摘要:
A method of converting at least one first alkane to a mixture of at least one low molecular weight alkane (optionally also including additional lower and/or higher molecular weight alkanes) and at least one high molecular weight alkane, comprises: reacting a first alkane in the presence of dual catalyst system comprising a first catalyst (i.e., a hydrogen transfer catalyst) and a second catalyst (i.e., a metathesis catalyst) to produce a mixture of low and high molecular weight alkanes.
摘要:
The present inventions relates to methods of discovering or developing novel material or compound. In particular, the methods include the steps of using of general expert knowledge to identify currently available molecules, setting forth desired properties for a target molecule, designing a set of test molecule from the currently available molecule using computational methods (the test molecules having desired properties in the computational models); synthesizing the test molecules, testing the test molecules in real experiments, and identifying the target molecule which is the test molecule that has the desired properties.
摘要:
The invention provides a polymeric salt, wherein the monomer unit of the polymeric salt comprises two nitrogen containing heterocyclic groups joined by a rigid linker group. The nitrogen atoms of the heterocyclic groups are disposed so as to enable a polymeric carbene formed by from the polymeric salt to complex with a metal atom. The invention also provides a polymeric metal complex which may be made from the polymeric salt, and which may be used in a Suzuki coupling reaction. The polymeric salt may be used as a heterogeneous organic catalyst for cyanation reaction.
摘要:
The first embodiment of the present invention provides a process, which includes: in a continuous process in a membrane reactor, asymmetrically hydrogenating at least one C═C, C═N or C═O double bond with a catalyst. Another embodiment of the present invention provides a ligand, which includes at least one di-1,3-aminophosphine homochiral active center; optionally, a linker; and a molecular weight-enlarging polymer; wherein the active center is bound to the molecular weight-enlarging polymer through the linker or is bound directly to the molecular weight-enlarging polymer; and wherein the linker is defined in the claims. Another embodiment of the present invention provides a process for preparing the above-noted ligand, and a catalyst that includes the above-noted ligand.
摘要:
Novel polynuclear organometallic complexes useful as catalysts for the reversible deshydrogenation of alkanes and alkane group are disclosed. The novel compounds comprise a first transition, a second transition metal p-bonded to an null5-aromatic ligand, and a pincer ligand. The pincer ligand comprises a 6p-electron aromatic ring having at least 2 ring atoms in an 1, 3 relationship bonded each to a neutral Lewis base through a bridge, the bridge being a diradical. The pincer ligand binds the first transition metal through each of the Lewis bases and through the ring atom adjacent to both Lewis bases and p-coordinates the second transition metal through all aromatic ring atoms. The first transition metal may also bond to 2 or 4 hydrogen atoms.
摘要:
Certain 2,6-pyridinecarboxaldehydebis(imine) and 2,6-diacylpyridinebis(imine) compounds are provided, which are particularly suitable for use as tridentate ligands in iron and cobalt olefin polymerization catalysts.
摘要:
Ethylene is oligomerized with certain catalysts based on iron and cobalt complexes of 2,6-pyridinecarboxaldehydebis(imine) and 2,6-diacylpyridine-bis(imine) tridentate ligands.
摘要:
The present invention relates to the preparation of novel catalysts made from transition metal compounds and “tridentate” 4,5-diphosphinoacridine ligands (“acriphos”). The novel ligands employed herein are diphosphine compounds of 4,5-disubstituted acridine which coordinate transition metals in a three-fold way with the two phosphorus atoms and the acridine nitrogen. The invention also relates to the use of the novel catalysts for the catalysis of carbon monoxide conversion via the water-gas shift reaction (WGSR: CO+H2O→CO2+H2) and for the catalysis of the following reactions: hydroformylation, carbonylation, carboxylation, hydrogenation, hydrocyanogenation, hydrosilylation, polymerization, isomerization, cross-couplings and metathesis. The invention further relates to heretofore unknown syntheses of the 4,5-diphosphinoacridines through the reaction of 4,5-difluoroacridine with alkali metal phosphides [R2P−M+(M+═Li+, Na+, K+, Rb+, Cs+, preferably K+)] or through the reaction of 4,5-dibromoacridine with chlorophosphines (R2PCl) and magnesium, and to the preparation of 4,5-difluoroacridine and 4,5-dibromoacridine.
摘要翻译:本发明涉及由过渡金属化合物和“三齿”4,5-二磷酸吖啶配体(“acriphos”)制备的新型催化剂的制备。 本文中使用的新型配体是4,5-二取代吖啶的二膦化合物,其以三重方式与两个磷原子和吖啶氮配位过渡金属。 本发明还涉及新催化剂用于通过水煤气变换反应(WGSR:CO + H 2→CO 2 + H 2)催化一氧化碳转化的用途,并且用于催化下列反应:加氢甲酰化,羰基化, 羧化,氢化,氢氰化,氢化硅烷化,聚合,异构化,交联和复分解。 本发明还涉及通过4,5-二氟吖啶与碱金属磷化物[R2P-M +(M + = Li +,Na +,K +,Rb +,Cs +,优选K +)]的反应的4,5-二磷杂吖啶的未知合成,或 通过4,5-二溴吖啶与氯膦(R2PCl)和镁的反应,以及制备4,5-二氟吖啶和4,5-二溴吖啶。
摘要:
Heat curable organopolysiloxane compositions are provided utilizing a vinyl silicone organopolysiloxane fluid, a silicon hydride siloxane and an effective amount of a preformed latent platinum catalyst resulting from the reaction in the substantial absence of organopolysiloxane fluid, between a zero valent platinum catalyst and an organic nitrogen compound, such as 2,2'-bipyridine or diethyl azodicarboxylate.
摘要:
The invention relates to a catalyst system, which comprises a source of a Group VIII metal and a polyphosphine. The invention further relates to a process for the preparation of alpha, beta-olefinically unsaturated compounds utilizing this catalyst system.