1120-87-2Relevant articles and documents
Unusual carbonyl...carbonyl interaction in supramolecular structures of silver(I) complexes with 2,6-pyridinediylbis(4-pyridinyl)methanone
Wan, Chong-Qing,Mak, Thomas C. W.
, p. 832 - 842 (2011)
A series of silver(I) complexes of a higher homologue of di-2-pyridyl ketone, 2,6-pyridinediylbis(4-pyridinyl)methanone (abbreviated as L), consisting of {[Ag(L)(BF4)]·H2O}∞ (1), {[Ag(L)(NO3)]·H2O}∞ (2), [Ag 3(L)2(NO2)3(H2O)] ∞ (3), [Ag(L)]2(PF6)2 (4), {[Ag(L)(CO2CF3)]2}∞ (5), [Ag(L)]2(SO3CF3)2 (6), and [Ag(L)]2(CO2CF2CF3)2 (7), have been synthesized and characterized. Complexes 1 and 2 are isomorphous helical polymers, 3 is a metallacycle featuring a trisilver(I) core, and 4-7 are isostructural complexes containing a common dinuclear [Ag2(L) 2]2+ metallacyclic skeleton. All complexes except 4 feature a common dominant intermolecular multipolar carbonyl...carbonyl interaction, which along with argentophilic Ag(I)...Ag(I), π...π, hydrogen-bonding, Ag...O=C, O(trifluoroacetate)...C= O as well as unconventional C=O...π and anion-π(pyridyl) interactions assemble the different coordination motifs (1-3, 5-7) into higher-dimensional frameworks. Three principal types of carbonyl...carbonyl interaction exhibiting antiparallel, sheared parallel, and perpendicular motifs are observed, and unusual supramolecular associations such as "...[C= O...C=O]n ..." (in 1-2 and 6) and "...[C= O...C=O...π]n..." (in 3) and "C=O...C=O...C=O" (in 7) are the novel structural features established in these complexes. The geometrical parameters and role of such noncovalent interactions in the construction of the present series of supramolecular metal-organic frameworks are discussed.
Electrophotochemical Ring-Opening Bromination oftert-Cycloalkanols
Yamamoto, Kosuke,Toguchi, Hiroyuki,Kuriyama, Masami,Watanabe, Shin,Iwasaki, Fumiaki,Onomura, Osamu
, p. 16177 - 16186 (2021/09/13)
An electrophotochemical ring-opening bromination of unstrainedtert-cycloalkanols has been developed. This electrophotochemical method enables the oxidative transformation of cycloalkanols with 5- to 7-membered rings into synthetically useful ω-bromoketones without the use of chemical oxidants or transition-metal catalysts. Alkoxy radical species would be key intermediates in the present transformation, which generate through homolysis of the O-Br bond in hypobromite intermediates under visible light irradiation.
One-pot homo- and cross-coupling of diazanaphthalenes via C-H substitution: Synthesis of Bis- and Tris-diazanaphthalenes
Ucar, Sefa,Dastan, Arif
supporting information, p. 4013 - 4022 (2020/09/21)
The transition metal-free coupling reactions of unactivated diazanaphthalenes were studied using only lithium tetramethylpiperidine (LiTMP) reagent. Symmetrical and nonsymmetrical bis-diazanaphthalenes were synthesized in moderate to high yield by homo- and cross-coupling of related monomers. In addition, the single-step synthesis of diquinoxalino [2,3-a: 2', 3'c] phenazine and 2,2': 3', 2″ - terquinoxaline using the appropriate equivalent amount of LiTMP was performed. The products were characterized by means of NMR spectroscopy and HRMS spectrometry.
