Abstract: Process for preparing 2,2?-dihydroxy-3,3?-di-tert-butyl-5,5?-dimethoxy-1,1?-biphenol.

Abstract: Method for coupling a phenol and an arene using selenium dioxide, and also novel phenol-arene derivatives.

Abstract: The invention relates to mixtures of constitutional isomer bisphosphites of formulae (1a) and (2a), to a method for the production thereof, to the reaction thereof with metals to form mixtures containing complex compounds of the constitutional isomer bisphosphites of formulae (1a) and (2a) and the metal, and to the use thereof as a catalytically active composition in hydroformylation reactions. Said hydroformylactically active compositions comprises, in addition to the complex compounds of metal and the constitutional isomer bisphosphites of formulae (1a) and (2a), non-bound bisphosphites of the constitutional isomer bisphosphites of formulae (1a) and (2a) and at least one additional component.

Abstract: The invention relates to a process for the purification of a contaminated organophosphorus product which comprises at least one organophosphorus compound and, as contaminant, at least one chlorine compound. It is based on the object of indicating a purification method in which the chlorine content of an organophosphorus product which comprises at least one organophosphorus compound and at least one chlorine compound as contaminant, can be reduced from originally 1000 to 100 000 ppm to a total chlorine content between 10 ppm and 10 000 ppm. This is achieved by a process with the steps: a) provision of the contaminated organophosphorus product; b) complete dissolution of the contaminated organophosphorus product in a solvent to give a contaminated solution; c) separation of the contaminated solution by means of a filter and/or by means of a membrane separation unit to give a purified solution; d) removal of the solvent from the purified solution to give a purified organophosphorus product.

Abstract: The invention relates to processes for preparing aldehydes by hydroformylation of alkenes, in which an alkene-containing feed mixture is subjected to a primary hydroformylation with synthesis gas in the presence of a homogeneous catalyst system, the primary hydroformylation being effected in a primary reaction zone from which a cycle gas containing at least some of the products and unconverted reactants of the primary hydroformylation are drawn off continuously and partly condensed, with recycling of uncondensed components of the cycle gas into the primary reaction zone, and with distillative separation of condensed components of the cycle gas in an aldehyde removal stage to give an aldehyde-rich mixture and a low-aldehyde mixture. The problem that it addresses is that of developing the process such that it achieves high conversions and affords aldehyde in good product quality even in the case of a deteriorating raw material position.

Abstract: The invention is concerned with a process for preparing 2,2?-biaryls, especially of 2,2?-biphenols in which a reaction mixture comprising a first aryl, a second aryl and selenium dioxide is heated, the first aryl being reacted with the second aryl to give the corresponding 2,2?-biaryl, wherein the reaction mixture additionally comprises molybdenum(V) chloride.

Abstract: The present invention relates to a method and a device for controlling the viscosity of reaction solutions in the hydroformylation of olefin-containing mixtures.

Abstract: The invention relates to a mixture of unsymmetric bisphosphites, to a process for preparation thereof, to the reaction thereof with metals to give mixtures comprising complexes of the bisphosphites and the metal, and to the use thereof as a catalytically active composition in hydroformylation reactions, and also to the hydroformylation reaction itself.

Abstract: SILP catalyst for the hydroformylation of olefins with synthesis gas, wherein the catalyst comprises at least one spherical catalyst pellet of radius R, characterized in that the catalyst complies with the following SILP modulus: c i c i , S = R x ? sinh ? ( ? SILP ? x R ) sinh ? ( ? SILP ) where ?SILP is a dimensionless number in respect of the spherical catalyst pellet relating the mass transfer, in the pore, across the phase interface between gas and ionic liquid and in the ionic liquid to the reaction, where ci is the concentration of a component i and ci,S is the concentration of a component i at the surface of the SILP catalyst pellet, and x is the position. Also featured is a process for hydroformylation of olefins with synthesis gas by using the SILP catalyst.

Abstract: The invention relates to a device for the continuous, homogeneous-catalysis reaction of a liquid with a gas and optionally an additional fluid, wherein the device comprises at least one reactor having an external liquid circulation driven by a pump, and wherein the device has at least one membrane separation stage that preferably holds back the homogeneous catalyst. The aim of the invention is to specify a device that allows homogeneous-catalysis gas/liquid phase reactions, in particular hydroformylations, which operate with membrane separation of the catalyst to be performed economically at an industrially relevant scale. Said aim is achieved in that a jet loop reactor is provided as the reactor, and that the pump and the membrane separation stage are arranged in the same external liquid circuit.

Abstract: The present invention relates to a composition comprising: a) at least one support material; b) at least one metal selected from transition group VIII of the Periodic Table of the Elements and c) at least one compound of the formula (I) R?-A-R? (I), where A, R? and R? are each an organic radical, where R? and R? have the structural element —O—P(—O—)2 with trivalent P and are bonded covalently to the A radical via the latter, with the proviso that R??R?, to a process for producing such a composition, to the use of the composition and to a process and an apparatus for hydroformylation in which the composition is used.

Abstract: The invention relates to the following subject matters: a) phosphoramidites of the formula (I); b) transition metal-containing compounds of the formula Me(acac)(CO)L, wherein L is selected from the formula (I); c) catalytically active compositions in the hydroformylation, which contain the compounds listed in a) and b); d) method for hydroformylation of unsaturated compounds using the catalytically active composition listed under c); and e) multi-phase reaction mixture containing unsaturated compounds, gas mixture comprising carbon monoxide, hydrogen, aldehydes, and the catalytically active compositions described in c).

Abstract: Bisphosphites having at least one unsymmetric outer biphenol unit are useful for the hydroformylation of an olefin.

Abstract: Monophosphites comprising an anthrol are useful for catalyzing hydroformylation of an olefin to an aldehyde.

Abstract: Monophosphites including a benzopinacol structure and metal complexes thereof are provided. The metal complex compositions are useful as hydroformylation catalysts. The metals of the complex include Rh, Ru, Co and Ir. A method of hydroformylation using the metal complex or the metal complex components is also provided.

Abstract: Bisphosphites having an outer naphthyl-phenyl unit.

Abstract: Bisphosphites having an unsymmetric central biaryl unit.

Abstract: The subject matter of the present invention is a plurality of products and the use thereof as a catalytically active composition in a method for producing aldehydes.

Abstract: The invention relates to: a) phosphoramidites of formula (I), wherein Q is selected from substituted or unsubstituted 1,1?-biphenyl groups, R1 stands for hydrogen, and R2 stands for C1-C10 alkyl groups, substituted or unsubstituted C4-C6 cycloalkyl groups, or phenyl groups and wherein R2 is not a tertiary butyl group; b) transition-metal-containing compounds of the formula Me(acac)(CO)L, wherein Me=transition metal and L of the general formula (II): wherein Q is selected from substituted or unsubstituted 1,1?-biphenyl groups, R1 stands for hydrogen, R2 stands for C1-C10 alkyl groups, substituted or unsubstituted C4-C6 cycloalkyl groups, or phenyl groups, and R2 is not a tertiary butyl group and wherein the transition metal Me is selected from ruthenium, cobalt, rhodium, and iridium; c) catalytically active compositions in the hydroformylation, which comprise the compounds mentioned under a) and b); d) method for the hydroformylation of unsaturated compounds by using the catalytically active composition mentio

Abstract: The invention relates to a method for producing a product mixture (2) by means of the technical hydroformylation of a hydrocarbon stream (1) that contains isobutene, and for separating the product mixture (2) that is obtained, as well as to a device for the claimed method and to the use of a claimed device. The problem addressed thereby is that of providing a method and an associated device that allow the amount of high-boiling substances in the product mixture (2) to be kept as low as possible and thus the yield of the reaction to be increased. The problem is solved by the use of a nano-filtration device (M) for separating the catalyst from the product mixture (2), said device having especially high permeability to 3-methylbutanoic acid.