- Conversion of hydrazides into: N, N ′-diacylhydrazines in the presence of a ruthenium(II)-arene complex
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Mono and dinuclear p-cymene-ruthenium(ii) complexes [RuCl(L1)(η6-p-cymene)]Cl, where L1 is propionic acid hydrazide (1) and [Ru2Cl2(L2)(η6-p-cymene)2], where H2L2 is N1,N2-dipropionylhydrazine (2), were prepared by a reaction of [RuCl2(η6-p-cymene)]2 with the corresponding ligand precursor. Upon the reaction of [RuCl2(η6-p-cymene)]2 with butyric acid hydrazide and pentanoic acid hydrazide in a 1:1 molar ratio in situ formation of tetradentate bridging ligands, N1,N2-dibutanoylhydrazine and N1,N2-dipentanoylhydrazine, respectively, occurred and the dinuclear complexes [Ru2Cl2(L3)(η6-p-cymene)2] (3) and [Ru2Cl2(L4)(η6-p-cymene)2] (4) were isolated. The compounds were characterised by elemental analysis, ESI-mass spectrometry, IR and 1D and 2D NMR spectroscopies. The structures of all complexes were established using single crystal X-ray crystallography. According to these data in both the mono- and dinuclear complexes the ruthenium atoms adopt the usual three-leg piano-stool geometry which is common for this type of complexes. Combining DFT calculations with the characterisation of the final products using X-ray diffraction, a possible reaction mechanism was discussed.
- Nikoli?, Stefan,?iri?, Ivanka,Roller, Alexander,Luke?, Vladimir,Arion, Vladimir B.,Grguri?-?ipka, Sanja
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- Parameters of synthesis of hydrazides and 1,2-diacylhydrazines by thermal decomposition of hydrazine salts of aliphatic carboxylic acids
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The reaction parameters were refined for synthesis of hydrazides and 1,2-diacylhydrazines by thermal decomposition of salts of aliphatic carboxylic acids of the general formulas RCOOH · N2H4 · H2O and 2RCOOH-N2H4-H2O (R = C2H5-C8H17). Derivatograms for series of compounds were obtained. The effect of hydrazine hydrate excess, temperature, reaction duration, and crystallization conditions on the yield and quality of hydrazides of C7-C9 carboxylic acids was studied.
- Drozdetskii,Radushev,Turbin,Gusev,Drozdova,Shekhonina,Chekanova
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p. 302 - 306
(2007/10/03)
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