Reaction of dodecacarbonyltriruthenium with cinnamaldehyde

The reaction of dodecacarbonyltriruthenium with cinnamaldehyde yielded a mixture of the known H₄Ru₄(CO)₁₂, H₂Ru₄(CO)₁₃, and H₂Ru₆(CO)₁₈, and Ru₆C(CO)₁₇ clusters and the 1,1,1,2,2,2,3,3,3-nonacarbonyl-1,2;1,3-(μ₃-dihydrido)-1,3-σ;2-π-[μ₃-η²-(pheny)vinylidene]triangulotriruthenium complex. The structure of the last-mentioned compound was established by X-ray diffraction study. The mechanism of the reaction and a possible pathway of formation of the vinylidene complex are discussed. Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 5, pp. 1008–1011, May, 1998.     

Effect of substitution degree of 2-hydroxypropyl-β-cyclodextrin on the alkaline hydrolysis of cinnamaldehyde to benzaldehyde

The yield of benzaldehyde in the 2-hydroxypropyl-β-cyclodextrin (2-HP-β-CD), with a low degree of substitution (DS = 3.9), catalytic system was 70%, which was higher than that of the system with 8.8 DS under the optimised conditions (323 K, 2% NaOH (w/v), cinnamaldehyde:2-HP-β-CD = 1:1 (molar ratio)). Due to the structural complementary effects of the host and guest, cyclodextrins (CDs) played the catalysis role in the reaction, which was confirmed by kinetic studies and solubilisation. The characterisation of NMR and fluorescence measurement suggested that the extent of hydroxypropyl substitution affected the cavity structure of the CD molecule. The hydroxypropyl groups at O₂ positions were spatially spread out but restricted, which affected the molecular encapsulation capabilities.     

Polymer complexes,XXIII: Synthesis and physico-chemical studies on transition metal complexes of symmetric novel poly(N,N′-o-phenylenediamine)-bis(cinnamaldehyde)

Summary New complexes derived from polymeric N,N-o-phenylenediamine bis(cinnamaldehyde) (L) with Cu^II, Co^II, Ni^II, Zn^II, UO ₂ ^II , and Pd^II were prepared and characterized by elemental analysis, magnetic susceptibilities and spectroscopic (IR, far-IR,¹H-NMR,¹³C-NMR and EPR) studies. A bidentate methine nitrogen atoms coordination of the ligand is assigned in the isolated complexes. The stereochemistries of the polymer complexes have been studied with using magnetic and spectroscopic measurements. Analytical data show 2:1 or 1:1 (ligand:metal) stoichiometry with water molecules coordinated to the Zn^II ion, as evidenced from IR and thermal analysis (DTA). The ligand was tested as a corrosion inhibitor for copper; the limiting concentration of the ligand to give maximum efficiency (60%) is 10^–3 mol dm^–3 at 25°C.

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Polymere Komplexe, XXIII: Synthese und physikalisch-chemische Untersuchungen an Übergangsmetallkomplexen von symmetrischem Poly(N,N-o-phenylendiamin)bis(zimtaldehyd)

Zusammenfassung Es wurden neue Komplexe von polymerem Poly(N,N-o-phenylendiamin)bis-(zimtaldehyd) mit Cu(II), Co(II), Ni(II), Zn(II), UO₂(II) und Pd(II) hergestellt und mittels Elementaranalyse, magnetischen Suszeptibilitätsmessungen und spektroskopischen Methoden (IR, far-IR,¹H-NMR,¹³C-NMR und EPR) charakterisiert. Es wurde eine zweizähnige Methin-Stickstoff-Koordination in den Komplexen festgestellt. Die Stereochemie der Polymerkomplexe wurde mittels magnetischer und spektroskopischer Messungen untersucht. Aus den analytischen Daten, mit zusätzlichen Argumenten aus IR und thermischer Analyse (DTA), ergab sich eine 2:1 oder 1:1 (Ligand:Metall)-Stöchiometrie mit an Zn(II) koordinierten Wassermolekülen. Der Ligand wurde als Korrosionsinhibitor für Kupfer getestet: die Grenzkonzentration des Liganden zur maximalen Effizienz (60%) ist 10^–3 mol dm^–1 bei 25°C.

     

PREPARATION AND CHARACTERIZATION OF SCHIFF BASE POLYMERS DERIVED FROM 4,4''''-METHYLENEBIS(CINNAMALDEHYDE)

New Schiff base polymers poly[4,4'-methylenebis(cinnamaldehyde)ethylenediimine] (PMBCen), poly[4,4'-methylenebis(cinnamaldehyde) 1,2-propylenediimine] (PMBCPn), poly[4,4'-methylenebis(cinnamaldehyde) 1,3-propylenediimine] (PMBCPR), poly[4,4'-methylenebis(cinnamaldehyde)l,2-phenylenediimine] (PMBCPh), poly[4,4'-methylene-bis(cinnamaldehyde)meso-stilbenediimine] (PMBCS), poly[4,4'-methylenebis(cinnamaldehyde)urea] (PMBCUR), poly[4,4'-methylenebis(cinnamaldehyde)semicarbazone] (PMBCSc), poly[4,4'-methylenebis(cinnamaldehyde)thiosemicarbazone] (PMBCTSc) and poly[4,4'-methylenebis(cinnamaldehyde)hydrazone] (PMBCH) were formed by polycondensation of 4,4'-methylenebis(cinnamaldehyde) with ethylenediamine, 1,2-propylenediamine, 1,3-propylenediamine, 1,2-phenylenediamine, meso-stilbenediamine, urea, semicarbazide, thiosemicarbazide and hydrazine, respectively. The dialdehyde and polymers have been characterized through elemental micro-analysis, IR, UV-Vis and 'H-NMR spectroscopic techniques. Thermoanalytical studies and viscous flow of dilute solutions of dialdehyde and its polymers have been examined and compared.     

Protective Effects of Cinnamaldehyde on the Inflammatory Response,Oxidative Stress,and Apoptosis in Liver of Salmonella typhimurium-Challenged Mice

Salmonella typhimurium infection is associated with gastrointestinal disorder and cellular injury in the liver of both humans and animals. Cinnamaldehyde, the main component of essential oil from cinnamon, has been reported to have anti-inflammatory, anti-oxidative, and anti-apoptotic effects. However, it remains unknown whether cinnamaldehyde can alleviate Salmonella typhimurium infection-induced liver injury in mice. In the present study, we found that cinnamaldehyde attenuated Salmonella typhimurium-induced body weight loss, the increase of organ (liver and spleen) indexes, hepatocyte apoptosis, and the mortality rate in mice. Further study showed that cinnamaldehyde significantly alleviated Salmonella typhimurium-induced liver injury as shown by activities of alanine transaminase, aspartate transaminase, and myeloperoxidase, as well as malondialdehyde. The increased mRNA level of pro-inflammatory cytokines (IL-1β, IL-6, TNF-α, and IFN-γ) and chemokines (CCL2 and CCL3) induced by Salmonella typhimurium were significantly abolished by cinnamaldehyde supplementation. These alterations were associated with a regulatory effect of cinnamaldehyde on TLR2, TLR4, and MyD88. 16S rDNA sequence analysis showed that Salmonella typhimurium infection led to upregulation of the abundances of genera Akkermansia, Bacteroides, Alistipes, Muribaculum, and Prevotellaceae UCG-001, and downregulation of the abundances of genera Lactobacillus, Enterorhabdus, and Eggerthellaceae (unclassified). These alterations were reversed by cinnamaldehyde supplementation. In conclusion, cinnamaldehyde attenuated the inflammatory response, oxidative stress, and apoptosis in the liver of Salmonella typhimurium-infected mice. Supplementation of cinnamaldehyde might be a preventive strategy to alleviate liver injury caused by Salmonella typhimurium infection in humans and animals.     

La2O3助剂对Au/TiO2催化肉桂醛选择性加氢性能的影响

以溶胶-凝胶法制得的TiO2和La2O3-TiO2为载体,采用沉积-沉淀法制备了一系列Au催化剂,用于肉桂醛选择性加氢反应,并运用N2吸附-脱附、X射线衍射、高分辨率透射电镜、程序升温还原和X射线光电子能谱等方法对催化剂进行了表征,系统考察了La2O3含量对Au/TiO2催化剂物化性质和催化性能的影响.结果表明,适量L...