Refernces
10.1021/jacs.6b09787
Terephthalaldehyde is a small aromatic dialdehyde with two aldehyde groups on the benzene rings. It serves as a linear building block and cross-links with the central building block (1) to form the COF structure. 2,3,5,6-Tetrafluoroterephthalaldehyde is similar to terephthalaldehyde, but has four fluorine atoms on the benzene rings. It is used in conjunction with terephthalaldehyde to enhance the electrostatic stability of the COF structure. Biphenyl-4,4'-dicarboxaldehyde is a twisted aromatic dialdehyde with two benzene rings connected by a single bond and one aldehyde group on each benzene ring. It is used as a linear building block in some COF syntheses. These chemicals are essential for the design, synthesis, and functional properties of the COFs, and their specific structures and interactions play a crucial role in achieving the desired crystallinity and electronic behavior.
10.1021/j100157a024
J. L. Emdee, K. Brezinsky, and I. Glassman investigate the oxidation mechanisms of m- and p-xylene at high temperatures using an atmospheric flow reactor. The study found that m-xylene is oxidized through sequential oxidation and removal of the methyl side chains, while p-xylene undergoes both simultaneous and sequential oxidation of its side chains. The formation of p-xylylene during p-xylene oxidation opens up a simultaneous oxidation route, leading to the formation of p-phthalaldehyde. The study also examined the oxidation of p-tolualdehyde and the pyrolysis of p-methylanisole to better understand specific steps of the mechanisms. The results indicated that the aldehydic side chain is consumed quicker than the methyl side chain, and methylcyclopentadienyl and CO are formed from the methylphenoxy radical. The study concludes that the simultaneous oxidation route involving p-xylylene is significant for p-xylene but not for m-xylene, and this route contributes to the faster reaction rate of p-xylene compared to m-xylene under similar conditions.
10.1139/v82-111
The research investigates the synthesis and catalytic properties of a dimeric steroid, 3, which acts as a catalyst for the hydrolysis of 3-arylpropionate esters of 3-hydroxy-4-nitrobenzoic acid. The purpose of the study is to explore the potential of dimeric steroids to enhance catalytic activity through increased hydrophobic interactions compared to monomeric steroids. The key chemicals used include p-xylenediamine, sodium cyanoborohydride, terephthalaldehyde, and various arylpropionate esters (e.g., HCA-HNB, NPA-HNB, and PPA-HNB). The study concludes that the dimeric steroid 3 significantly enhances the rate of hydrolysis, achieving a 200-fold rate enhancement relative to imidazole for phenanthryl propionate and a 3000-fold enhancement relative to a hypothetical reaction with the steroid alone. The results demonstrate that the dimeric structure allows for greater hydrophobic contact, leading to substantial rate enhancements, which provides valuable insights for designing artificial enzymes.
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