Topic
Carboxylic acid
About: Carboxylic acid is a research topic. Over the lifetime, 48544 publications have been published within this topic receiving 605696 citations.
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TL;DR: Several important features of covalent postsynthetic modification (PSM) on MOFs are demonstrated, including facile introduction of catalytic functionality using simple organic reagents (e.g., anhydrides); the ability to utilize and recycle organocatalytic MOFs; and control of catalyst activity through choice of functional group.
Abstract: A metal−organic framework (MOF) containing 2-amino-1,4-benzenedicarboxylate (NH2−BDC) as a building block is shown to undergo chemical modification with a set of cyclic anhydrides. The modification of the aluminum-based MOF known as MIL-53(Al)-NH2 (MIL = Material Institut Lavoisier) by these reagents is demonstrated by using a variety of methods, including NMR and electrospray ionization mass spectrometry (ESI-MS), and the structural integrity of the modified MOFs has been confirmed by thermal gravimetric analysis (TGA) and powder X-ray diffraction (PXRD). Reaction with these cyclic anhydrides produces MOFs that display carboxylic acid functional groups within their pores. Furthermore, it is shown that maleic acid functionalized MIL-53(Al)-AMMal can act as a Bronsted acid catalyst and facilitate the methanolysis of several small epoxides. Experiments show that MIL-53(Al)-AMMal acts in a heterogeneous manner and is recyclable with consistent activity over at least three catalytic cycles. The findings prese...
107 citations
TL;DR: In this article, the authors show that LDHs containing citrate, oxalate, tartrate and malate ions free from other anions can be obtained by a simple procedure involving dissolution of a magnesium, aluminium, nickel-aluminium or zinc-aluminum carbonate-containing LDH precursor by adding the appropriate carboxylic acid followed by precipitation of the product by addition of the mixture to a basic solution.
107 citations
TL;DR: Results demonstrate that citric acid can be applied in a new way, making use of its anhydride formation to functionalize OH-functional polyesters, which is an important new step toward fully biobased coating systems.
107 citations
TL;DR: In this paper, four carboxylic acids with a number of α-hydrogen atoms ranging from three to zero were tested in the selective hydrogenation to aldehyde.
Abstract: Four carboxylic acids with a number of α-hydrogen atoms ranging from three to zero were tested in the selective hydrogenation to aldehyde. The acids used were acetic, propanoic, isobutyric, and pivalic acid. The oxides of iron, vanadium, zirconium, and titanium were used as catalysts. It was found that by decreasing the number of α-hydrogen atoms the selectivity to the aldehyde increased, while the formation of the main by-product, ketone, was suppressed. It is suggested that this is due to the fact that the ketonisation proceeds via a ketene-like intermediate, the formation of which needs the presence of α-hydrogen. Furthermore, the reactions to aldehyde and ketone seem to be in competition with each other.
107 citations
TL;DR: The mechanism of enantiodifferentiation in the hydrogenation of alkenoic acids over cinchona-modified Pd has been investigated using the tiglic acid → 2-methyl-butanoic acid transformation as test reaction as discussed by the authors.
107 citations