38433-80-6Relevant articles and documents
PRODUCING BDO VIA HYDROFORMYLATION OF ALLYL ALCOHOL MADE FROM GLYCERIN
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Paragraph 0050, (2019/09/06)
A method including hydroformylating, with syngas, allyl alcohol in an allyl alcohol feed, to produce a hydroformylation product comprising 4-hydroxybutyraldehyde and 3-hydroxy-2-methylpropionaldehyde; and producing a 1,4-butanediol (BDO) product comprising BDO and 1,3-methylpropanediol via hydrogenation of at least a portion of the hydroformylation product. A method including hydroformylating, with syngas, allyl alcohol in a feed comprising bio-allyl alcohol, to produce a hydroformylation product comprising 4-hydroxybutyraldehyde and 3-hydroxy-2-methylpropionaldehyde; and producing a BDO product comprising BDO and 1,3-methylpropanediol via hydrogenation of at least a portion of the hydroformylation product. A method including hydroformylating, with syngas, bio-allyl alcohol in a feed comprising bio-allyl alcohol, to produce a hydroformylation product comprising 4-hydroxybutyraldehyde and 3-hydroxy-2-methylpropionaldehyde; producing a BDO product comprising BDO and 1,3-methylpropanediol via hydrogenation of at least a portion of the hydroformylation product; and removing a byproduct of the production of the bio-allyl alcohol prior to hydroformylating the bio-allyl alcohol and/or from the BDO-product.
Backbone-Modified Bisdiazaphospholanes for Regioselective Rhodium-Catalyzed Hydroformylation of Alkenes
Wildt, Julia,Brezny, Anna C.,Landis, Clark R.
, p. 3142 - 3151 (2017/09/05)
A series of tetraaryl bisdiazaphospholane (BDP) ligands were prepared varying the phosphine bridge, backbone, and substituents in the 2- and 5-positions of the diazaphospholane ring. The parent acylhydrazine backbone was transformed to an alkylhydrazine via a borane reduction procedure. These reduced ligands contained an all sp3 hybridized ring mimicking the all sp3 phospholane of (R,R)-Ph-BPE, a highly selective ligand in asymmetric hydroformylation. The reduced bisdiazaphospholane (red-BDP) ligands were shown crystallographically to have an increased C-N-N-C torsion angle - this puckering resembles the structure of (R,R)-Ph-BPE and has a dramatic influence on regioselectivity in rhodium catalyzed hydroformylation. The red-BDPs demonstrated up to a 5-fold increase in selectivity for the branched aldehyde compared to the acylhydrazine parent ligands. This work demonstrates a facile procedure for increased branched selectivity from the highly active and accessible class of BDP ligands in hydroformylation.
Synthesis and characterization of hydrotalcite and hydrotalcite compounds and their application as a base catalyst for aldol condensation reaction
Bhat, Baber Masood
, p. 1751 - 1760 (2013/06/27)
Previous Studies on MgO doped by alkali cations have shown that solid catalyst are efficient for the aldolization, because of having preferably a high concentration of surface basic hydroxyl groups. Indeed the Mg-Al hydrotalcites actuvated by calcinations at temperatures not exceeding 1073K are mixed oxides of Mg(Al)O type. They show the structure of MgO with smaller crystallographic parameters, then in periclase (MgO). The decrease of the size of the unit cell with increasing Al content can be accounted for by the smaller ionic size of Al3+(0.050 nm), then Mg2+ (0.060 nm). These mixed oxides contain both basic sites identified to O2- and OH- in amounts depending upon the calcinations temperature, i.e., is of the dehydroxylation degree of the hydrotalcite and Lewis acid sites provided by Al3+ and Mg2. The existence of acid-base pairs justifies the catalytic properties of hydrotalcites for the Aldolisation. The synthesized Hydrotalcites were then characterized using XRD and TGA/DTA techniques, which confirmed that the synthesized materials are hydrotalcite like compounds. There after the synthesized Hydrotalcites were successfully applied for the typical Aldol Condensation reaction of propionaldehyde and formaldehyde to get desired product methacrolein. We tested catalytic activity of synthesized hyrotalcites and from the results it was clear that, the Mg - Al hydrotalcite catalyzed Aldol reaction propionaldehyde coversion of 57.78% and with selectivity 51.23% to methacrolein. Ni- Al hydrotalcite showed a propionaldehyde conversion of 53.46% with 35.46% selectivity. Co - Al XRD pattern of the formed material confirms that the material is not hydrotalcite like. This material also did not show any catalytic activity for the above said Aldol condensation reaction.
