The author of 《Molecular design and structural pecularities of the 3- and 4-pyridylboron-capped tris-glyoximate and tris-dichloroglyoximate iron(II) clathrochelates with apical donor groups》 were Zelinskii, Genrikh E.; Belov, Alexander S.; Vologzhanina, Anna V.; Limarev, Ilya P.; Dorovatovskii, Pavel V.; Zubavichus, Yan V.; Lebed, Ekaterina G.; Voloshin, Yan Z.; Dedov, Alexey G.. And the article was published in Polyhedron in 2019. Reference of Pyridin-3-ylboronic acid The author mentioned the following in the article:
Tris-glyoximate and tris-dichloroglyoximate iron(II) clathrochelates with apical pyridyl groups were obtained through one-pot template condensation of the corresponding α-dioxime with 3- or 4-pyridylboronic acids on the iron(II) ion as a matrix under vigorous reaction conditions using the boiling CF3COOH as a solvent. The initially formed mixtures of mono- and diprotonated clathrochelate species were converted into the target macrobicyclic intracomplexes under basic conditions. These complexes were characterized using elemental anal., MALDI-TOF mass spectrometry, IR, UV-visible, 1H and 13C NMR spectroscopies, and by single crystal x-ray diffraction as well. In their mols., the encapsulated iron(II) ion is situated in the center of its FeN6-coordination polyhedron. The geometry of all the FeN6-coordination polyhedra is intermediate between a trigonal prism and a trigonal antiprism with the average distortion angles φ from 16.7 to 17.7°. Their heights h fall from 2.36 to 2.38 Å and the averaged bite angles α vary in a narrow range 78.2-78.4°. Characteristic feature of the 3- and 4-pyridylboron-capped glyoximate clathrochelate mols., as compared with their aliphatic and aromatic analogs, is shortening of the chelate C-C bonds from 1.45 to 1.42 Å. Comparison of the values of a ligand aspect ratio for the obtained new pyridyl-terminated iron(II) clathrochelates with those for their known aliphatic tris-dioximate analogs was performed. After reading the article, we found that the author used Pyridin-3-ylboronic acid(cas: 1692-25-7Reference of Pyridin-3-ylboronic acid)
Pyridin-3-ylboronic acid(cas: 1692-25-7) belongs to pyridine. Pyridines form stable salts with strong acids. Pyridine itself is often used to neutralize acid formed in a reaction and as a basic solvent. Reference of Pyridin-3-ylboronic acid