摘要:
In one aspect, oligomeric and polymeric species are described herein exhibiting new architectures and associated properties. In some embodiments, such species are synthesized by oligomerization or polymerization of diene monomer via cycloaddition in the presence of a transition metal complex. Oligomers described herein, for example, comprise cyclobutane units in the oligomer backbone. Similarly, a polymers described herein comprise cyclobutane units in the polymer backbone.
摘要:
Provided is a process for producing an aromatic hydrocarbon efficiently at high yield from a lower hydrocarbon containing methane as a major component, and such a process for producing an aromatic hydrocarbon includes the step of reacting a lower hydrocarbon containing methane as a major component in the presence of a transition-metal-containing crystalline metallosilicate catalyst which is obtainable by supporting 5 to 25 parts by weight of a transition metal (X) on 100 parts by weight of a modified crystalline metallosilicate obtainable by subjecting a crystalline metallosilicate to a series of treatment (A) including a step (i) of eliminating part of a metal from the crystalline metallosilicate and a silylation step (ii).
摘要:
A process of the production of isoprene cyclic trimers, i.e., 1, 5, 9- and 1, 6, 9-trimethylcyclododecatriene-(1, 5, 9) through a catalytic oligomerization of isoprene by employing a catalyst prepared by a combination of a tri-valent titanium compound, an organoaluminum compound, an oxygen-containing compound such as carbonyl and ether compounds, and a compound such as a sulfur-containing compound and a nitrile compound.
摘要:
The preparation and use of bis(.mu.-diphenylphosphido)tris(triethylphosphine)dinickel and tris(triethylphosphine)(triphenylphosphine)nickel is disclosed.
摘要:
The preparation and use of bis(.mu.-diphenylphosphido)tris(triethylphosphine)dinickel and tris(triethylphosphine)(triphenylphosphine)nickel is disclosed.
摘要:
In a method of producing a dimer with a six-membered ring by contacting a catalyst containing iron compounds and organoaluminum compounds with conjugated dienes, the improvements comprising using a catalyst comprising ferrous or ferric compounds organoaluminum compounds and nitric oxide.
摘要:
A process for the preparation of oligomers especially of 1,3diolefins which comprises contacting an olefinic feed with a carbonyl free 0-valent nickel complex catalyst containing 1 to 4 electron donor constituents in the presence of morpholine or a specified amine which amine is present in an excess beyond that which has been bonded to the nickel in the 0-valent nickel complex catalyst.
摘要:
IMPROVED RESULTS ARE OBTAINED IN THE OLIGOMERIZATION OF ISOPRENE TO FORM TRIMETHYL CYCLODODECATRIENE WHEN THE REACTOR IS PARTIALLY VENTED, AFTER THE COMPLETION OF THE FORMATION OF THE CATALYST COMPOSITION AND BEFORE ONSET OF APPRECIABLE OLIGOMERIZATION. THE VENTED PRODUCTS ARE MAINLY THOSE FORMED BY REACTION OF TRIETHYL ALUMINUM WITH VARIOUS IMPURITIES IN THE REACTOR.
摘要:
Organometallic complexes of transition metals, free of carbon monoxid are produced electrochemically by electrolysis in a cell having two metal electrodes and electrolyte solution comprising an organic solvent, a suitable complexing agent and, optionally, a conducting salt. The transition metal compounds involved comprise those of Groups IVb to VIIb and VIII and they may be used in metallic form as the anode. The cathode is advantageously a metal toward which the electrolyte is inert, e.g. aluminum. The complexing agent preferably comprises a compound of a transition metal of Group IVb, VIb or VIII, e.g. an acetylacetonate, organic acid salt or alkanolate of titanium, chromium, iron, cobalt or nickel. Quaternary ammonium or alkali metal salts may be used as conductors. The products are suited for catalysis of hydrogenation, oligomerization and isomerization.