Synthesis and characterization of two dehydroacetic acid derivatives and molybdenum(V) complexes: an NMR and crystallographic study (CROSBI ID 106540)
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Podaci o odgovornosti
Cindrić, Marina ; Vrdoljak, Višnja ; Kajfež Novak, Tanja ; Ćurić, Manda ; Brbot-Šaranović, Ana ; Kamenar, Boris
engleski
Synthesis and characterization of two dehydroacetic acid derivatives and molybdenum(V) complexes: an NMR and crystallographic study
Two enaminones ethyl 4-(4-hydroxy-6-methyl-2H-pyran-2-on-3-yl)-2-(tryptamino)-4-oxo-2-butenoate (HL1) and 3-(1-tryptaminoetylidene)-6-methyl-2H-pyran-2, 4(3H)-dione (HL2) have been prepared by the reactions of tryptamine with 2-hydroxy-4-(4-hydroxy)-6-methyl)-2Hbb-pyrane-2-on-3-yl)-4-oxo-2-butenoate (ehmpb) or with dehydroacetic acid (dha). The NMR spectroscopy confirmed that both tautomeric forms of HL1: endo-enol (tautomer A with hydroxyl group at position 4) and exo-enol form (tautomer B with hydroxyl group at position 7) are present in the DMSO-d(6) solution. The molecular and crystal structure as well as the NMR data of HL2 showed that the condensation of dha and tryptamine occurs at acetyl-carbonyl and not at the pyrone-carbonyl group. Also new dinuclear [Mo2O4(L-1)(2)(CH3OH)(2)] (1) and hexanuclear molybdenum(V) complexes (C10H12NH)[Mo6O12(OCH3)(4)(acac)(3)] (2) have been prepared by the reactions of [Mo2O3(acac)(4)] (acac = acetilacetonate ion) with HL1 or with tryptamine. All compounds have been characterized also by means of elemental analyses, IR spectroscopy as well as by thermal analyses.
dehydroacetic acid derivatives ; molybdenum(V) complexes
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Podaci o izdanju
701 (1-3)
2004.
111-118
objavljeno
0022-2860
10.1016/j.molstruc.2004.05.025