5435-64-3Relevant academic research and scientific papers
Pd-Catalyzed Dehydrogenative Oxidation of Alcohols to Functionalized Molecules
Mori, Takamichi,Ishii, Chihiro,Kimura, Masanari
supporting information, p. 1709 - 1717 (2019/09/04)
A dehydrogenative oxidation reaction of primary alcohols to aldehydes catalyzed by a simple Pd/Xantphos catalytic system was developed under an argon or nitrogen atmosphere without oxidizing agents or hydrogen acceptors. The reaction product could be easily changed: under aerobic conditions, esters were obtained in aprotic solvents, whereas the corresponding carboxylic acids were produced in aqueous media. These oxidizing processes were applicable to the efficient synthesis of useful nitrogen-containing heterocyclic compounds such as indole, quinazoline, and benzimidazole via intramolecular versions of this reaction from amino alcohols.
Supported Cobalt Nanoparticles for Hydroformylation Reactions
Hertrich, Maximilian Franz,Scharnagl, Florian Korbinian,Pews-Davtyan, Anahit,Kreyenschulte, Carsten Robert,Lund, Henrik,Bartling, Stephan,Jackstell, Ralf,Beller, Matthias
supporting information, p. 5534 - 5538 (2019/03/26)
Hydroformylation of olefins has been studied in the presence of specific heterogeneous cobalt nanoparticles. The catalytic materials were prepared by pyrolysis of preformed cobalt complexes deposited onto different inorganic supports. Atomic absorption spectroscopy (AAS) measurements indicated a correlation of catalyst activity and cobalt leaching as well as a strong influence of the heterogeneous support on the productivity. These new, low-cost, easy-to-handle catalysts can substitute more toxic, unstable and volatile cobalt carbonyl complexes for hydroformylations on a laboratory scale.
Selective hydroformylation of olefins over the rhodium supported large porous metal-organic framework MIL-101
Van Vu, Toan,Kosslick, Hendrik,Schulz, Axel,Harloff, Joerg,Paetzold, Eckhard,Schneider, Mathias,Radnik, Joerg,Steinfeldt, Norbert,Fulda, Gerhard,Kragl, Udo
, p. 410 - 417 (2013/10/22)
Highly porous and crystalline metal-organic framework MIL-101 has been synthesized and used for the preparation of rhodium supported catalyst. Acetylacetonato(1,5-cyclooctadiene)rhodium(I) has been used as catalyst precursor. The material has been characterized by XRD, XPS, SAXS, FTIR, SEM, TEM, AAS, and nitrogen adsorption. The catalytic properties of Rh@MIL-101 have been investigated in the hydroformylation of olefins with different structure and chain length to the corresponding aldehydes. High conversion and selectivity to n-aldehydes have been achieved in the hydroformylation of n-alk-1-enes. The obtained results show that the rhodium species are highly dispersed and preferentially located at internal and less accessible sites at the supertetrahedral units.
Preparation of imidazolidin-4-ones and their evaluation as hydrolytically cleavable precursors for the slow release of bioactive volatile carbonyl derivatives
Trachsel, Alain,Buchs, Barbara,Godin, Guillaume,Crochet, Aurelien,Fromm, Katharina M.,Herrmann, Andreas
supporting information; experimental part, p. 2837 - 2854 (2012/07/03)
Imidazolidin-4-ones are suitable in practical applications as hydrolytically cleavable precursors for the controlled release of fragrant aldehydes and ketones. The corresponding profragrances were prepared by treating aliphatic carbonyl compounds with commercially available amino acid amines in the presence of a base to yield mixtures of diastereomers. The two diastereomers isolated from the reaction of glycinamide hydrochloride with (-)-menthone were separated by column chromatography. The absolute stereochemistry of the isomers was determined by NMR spectroscopy and confirmed by X-ray single crystal structure analysis. Under acidic conditions and in protic solvents, the two diastereomers slowly isomerized without releasing the ketone. The hydrolysis of the precursors was investigated by solvent extraction from buffered aqueous solutions and a cationic surfactant emulsion, as well as by dynamic headspace analysis after deposition onto a cotton surface. Generally, ketones were shown to be more readily released than aldehydes. Increasing the size of the substituents at C-5 decreased the rate of hydrolysis in solution and on the cotton surface. Glycinamide-based imidazolidin-4-ones were more efficient than the corresponding oxazolidin-4-ones or oxazolidines. Neither the release rates in solution, nor the hydrophobicity of the precursor structure (which influences deposition), nor the combination of these two parameters allowed easily predicting the performance of the delivery systems in application. Copyright
PROCESS AND DEVICE FOR THE OXIDATION OF ORGANIC COMPOUNDS
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Page/Page column 6, (2011/04/25)
The invention relates to a process for the oxidation of organic compounds by means of oxygen, in which, in a first step, the organic compound and at least part of the oxygen required for the oxidation are introduced into a first reaction zone which is operated isothermally and with backmixing and, in a second step, the reaction mixture from the first reaction zone is introduced into a second reaction zone which is operated adiabatically. The invention further relates to a reactor for carrying out the process, which comprises at least one isothermal reaction zone (3, 5) and an adiabatic reaction zone (7) which are arranged in a reactor shell (8), with each isothermal reaction zone (3, 5) being configured in the form of a jet loop reactor and the adiabatic reaction zone (7) being configured as a bubble column.
Stereoelectronic effects in a homologous series of bidentate cyclic phosphines. A clear correlation of hydroformylation catalyst activity with ring size
Haddow, Mairi F.,Middleton, Ann J.,Orpen, A. Guy,Pringle, Paul G.,Papp, Rainer
scheme or table, p. 202 - 209 (2009/04/13)
The homologous series of diphosphines (CH2) n-1P(CH2)3P(CH2)n-1 where n = 5 (L5), 6 (L6), or 7 (L7) have been synthesized from the corresponding PhP(CH
MIXTURE OF DIISONONYL ESTERS OF 1,2-CYCLOHEXANEDICARBOXYLIC ACID, METHOD FOR THE PRODUCTION THEREOF AND USE OF THESE MIXTURES
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Page/Page column 25-26, (2008/06/13)
The invention relates to a mixture of diisononyl esters of 1,2-cyclohexanedicarboxylic acid, characterized in that the isononyl radicals of the diisononyl esters contained in the mixture have a degree of branching of 1.2 to 2.0, to a method for producing this mixture, and to the use of mixtures of this type.
Isononyl benzoates and their use
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Page 5, (2008/06/13)
The invention relates to isomeric nonyl benzoates, processes for their preparation, mixtures of the same with alkyl phthalate, alkyl adipate, or alkyl cyclohexanedicarboxylate, and also to the use of these mixtures.
PROCESS FOR PRODUCTION OF AN ALCOHOL
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Page 5, (2008/06/13)
A process for the production of an alcohol, by hydrogenation of an aldehyde over a copper and zinc-containing catalyst comprises the step of treating the reduced catalyst with a sulphur compound. The process reduces the hydrogenation of olefin contained in the aldehyde feed compared with a process using an untreated catalyst.
Precursors for fragrant ketones and fragrant aldehydes
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, (2008/06/13)
The present invention refers to fragrance precursors of formula I for a fragrant ketone of formula II and one or more fragrant aldehydes or ketones of formula III and IV, These fragrance precursors are useful in perfumery, especially in the fine and functional perfumery.
