Naslov
Synthesis and characterization of two dehydroacetic acid derivatives and molybdenum(V) complexes: an NMR and crystallographic study

Autori
Cindrić, Marina ; Vrdoljak, Višnja ; Kajfež Novak, Tanja ; Ćurić, Manda ; Brbot-Šaranović, Ana ; Kamenar, Boris

Izvornik
Journal of molecular structure (0022-2860) 701 (2004), 1-3; 111-118

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
dehydroacetic acid derivatives ; molybdenum(V) complexes

Sažetak
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.

Izvorni jezik
Engleski

Znanstvena područja
Kemija

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