Reference of 4-EthynylpyridineIn 2022 ,《Expanding the Scope of Metastable Species in Hydrogen Bonding-Directed Supramolecular Polymerization》 was published in Angewandte Chemie, International Edition. The article was written by Matern, Jonas; Fernandez, Zulema; Baumer, Nils; Fernandez, Gustavo. The article contains the following contents:
We reveal unique hydrogen (H-) bonding patterns and exploit them to control the kinetics, pathways and length of supramol. polymers (SPs). New bisamide-containing monomers were designed to elucidate the role of competing intra- vs. intermol. H-bonding interactions on the kinetics of supramol. polymerization (SP). Remarkably, two polymerization-inactive metastable states were discovered. Contrary to previous examples, the commonly assumed intramolecularly H-bonded monomer does not evolve into intermolecularly H-bonded SPs via ring opening, but rather forms a metastable dimer. In this dimer, all H-bonding sites are saturated, either intra- or intermolecularly, hampering elongation. The dimers exhibit an advantageous preorganization, which upon opening of the intramol. portion of the H-bonding motif facilitates SP in a consecutive process. The retardation of spontaneous self-assembly as a result of two metastable states enables length control in SP by seed-mediated growth. In the experimental materials used by the author, we found 4-Ethynylpyridine(cas: 2510-22-7Reference of 4-Ethynylpyridine)
4-Ethynylpyridine(cas: 2510-22-7) belongs to pyridine. Pyridines, quinolines, and isoquinolines have found a function in almost all aspects of organic chemistry. Pyridine has found use as a solvent, base, ligand, functional group, and molecular scaffold. As structural elements, these moieties are potent electron-deficient groups, metal-directing functionalities, fluorophores, and medicinally important pharmacophores. Reference of 4-Ethynylpyridine