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4-Carboxybenzaldehyde (CBA) is an organic compound with the formula OCHC 6 H 4 CO 2 H. It consists of a benzene ring substituted with both an aldehyde and a carboxylic acid, with these functional groups on opposite corners of the ring. This compound is formed in 0.5% yield as a byproduct in the production terephthalic acid from p-xylene. Since ...
The difference is attributed to the similarity in size between nitrate (NO − 3) and carbonate (CO 2− 3) ions and the fact that the potassium ion (K +) is larger than sodium (Na +) and calcium (Ca 2+) ions. [34] In the room-temperature structure of potassium nitrate, each potassium ion is surrounded by 6 nitrate ions.
4-Formylphenyl boronic acid crystallizes in colorless needles [1] or is obtained as an odorless, whitish powder, which dissolves little in cold but better in hot water. The compound is quite stable [3] and readily forms dimers and cyclic trimeric anhydrides, which complicate purification and tend to protodeboronize, a secondary reaction that occurs frequently in the Suzuki coupling, with ...
Dehydration by means of strong acid gives 3-Butylisocarbostyril [132-90-1] (8). Phosphorus oxychloride converts the oxygen function to the corresponding chloride via the enol forms 3-butyl-1-chloroisoquinoline [87-06-9] (9). Displacement of halogen with the sodium salt from 2-dimethylaminoethanol (10) affords dimethisoquin (11).
For example, from a solution of tetrachloroauric acid, the oxonium ion [H 7 O 3] + has been isolated as the salt [(H 7 O 3)(15-crown-5) 2][AuCl 4]. Neutron diffraction studies revealed a sandwich structure, which shows a chain of water with remarkably long O-H bond (1.12 Å) in the acidic proton, but with a very short OH•••O distance (1. ...
It also can be prepared by treating benzaldehyde under nitration conditions, a process that initially converts the aldehyde to the acid. 4-Nitrobenzoic acid is a precursor to 4-aminobenzoic acid , which is in turn used to prepare the anesthetic procaine . 4-Nitrobenzoic acid is prepared by oxidation of 4-nitrotoluene .
Ion-exchange resin beads. An ion-exchange resin or ion-exchange polymer is a resin or polymer that acts as a medium for ion exchange, that is also known as an ionex. [1] It is an insoluble matrix (or support structure) normally in the form of small (0.25–1.43 mm radius) microbeads, usually white or yellowish, fabricated from an organic polymer substrate.
An alkaline anion-exchange membrane fuel cell (AAEMFC), also known as anion-exchange membrane fuel cells (AEMFCs), alkaline membrane fuel cells (AMFCs), hydroxide-exchange membrane fuel cells (HEMFCs), or solid alkaline fuel cells (SAFCs) is a type of alkaline fuel cell that uses an anion-exchange membrane to separate the anode and cathode compartments.