Charge-assisted N–H(+)···O(-) and O–H···O(-) hydrogen bonds control the supramolecular aggregation of ferrocenedicarboxylic acid and bis-amidines
作者:Dario Braga、Lucia Maini、Fabrizia Grepioni、Andre´ De Cian、Olivier Fe´lix、Jean Fischer、Mir Wais Hosseini
DOI:10.1039/b002061n
日期:——
Directional NâH···O and OâH···O hydrogen bonds reinforced by charge assistance in the presence of anionâcation
interactions have been used to design and synthesise a whole family of new organic-organometallic supramolecular salts. The compounds [C5H16N4]2+[(η5-C5H4COO)2Fe]2â·2C2H5OH, 1, [C5H16N4]2+[(η5-C5H4COOH)(η5-C5H4COO)Fe]2}2â,
2, [C7H20N4]2+[(η5-C5H4COO)2Fe]2â·4H2O, 3, [C7H20N4]2+[(η5-C5H4COOH)(η5-C5H4COO)Fe]2}2â, 4, and [C7H18O2N4]2+[(η5-C5H4COO)2Fe]2â
·4H2O, 5, have been obtained by reacting [(η5-C5H4COOH)2Fe] with the bis-amidines [C5H14N4], [C7H18N4] and [C7H16O2N4]. The self-assembly between singly and doubly deprotonated acids and the protonated cations is controlled by the stoichiometric ratio and by the choice of solvent. The effect of charge assistance on the NâH···O interactions is discussed on the basis of a CSD analysis.
Modification of the thio-Pinner's method via in situ activation of a nitrile by thiating agents, S-8, P4S10, Lawesson reagent, or Na2S center dot 9H(2)O, was applied in the syntheses of bis(4,5-dihydro-1H-imidazol-2-yl)alkanes and bis(1,4,5,6-tetrahydropyrimidin-2-yl)alkanes.
YAMAMOTO, HISASHI;MARUOKA, KEIJI, J. AMER. CHEM. SOC., 1981, 103, N 14, 4186-4194
作者:YAMAMOTO, HISASHI、MARUOKA, KEIJI
DOI:——
日期:——
Regioselective carbonyl amination using diisobutylaluminum hydride