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1Author    F. Seel, J. SchuhRequires cookie*
 Title    Über die Umsetzung von Kupfersulfat mit Carbonsäuren und Carbonsäurederivaten in wäßrigen Lösungen unter hydrothermalen Bedingungen The Reaction of Copper Sulfate with Carboxylic Acids and their Derivatives in Aqueous Solutions under Hydrothermal Conditions  
 Abstract    Under hydrothermal conditions aqueous solutions of copper(II) sulfate (1) are reduced by means of saturated fatty acids with hydrogen at the a-atom to yield crystalline copper. In all cases carbon dioxide is liberated and lower fatty acids and ketones can be identified as reaction prod-ucts. a-Hydroxy and a-aminocarboxylic acids proved to be very effective reducing agents towards 1. The yield of copper varied from 2 to 2.5 mol Cu per 1 mol of amino acid. The reaction of 1 is suppressed by sulfuric acid. The presence of hydrochlorid acid or chlorides leads to the precipita-tion of copper(I) chloride. The mechanisms of the decomposition of the various types of carboxy-lic acids is discussed. It was also possible to precipitate metallic copper by means of various proteins. 
  Reference    Z. Naturforsch. 42b, 157—162 (1987); eingegangen am 19. September 1986 
  Published    1987 
  Keywords    Copper, Copper(II) Sulfate, Carboxylic Acids, Hydrothermal Reactions 
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 TEI-XML for    default:Reihe_B/42/ZNB-1987-42b-0157.pdf 
 Identifier    ZNB-1987-42b-0157 
 Volume    42 
2Author    M. K. Das, S. C. HakrabortyRequires cookie*
 Title    Boron Spirochelates Derived from Some Hydroxamic Acids and Carboxylic Acids  
 Abstract    A number o f boron spirochelates o f the general formula B [R 'C 0 N (R)0 ]Y have been syn­ thesized by the single-pot reaction o f boric acid, a hydroxamic acid R'C O N (R)O H and a car­ boxylic acid H 2Y . The spirochelates have been characterized by elemental analyses, by IR, N M R ('H and nB) and UV spectra and conductance measurements. They are non-electro-lytes. 
  Reference    Z. Naturforsch. 45b, 1123—1127 (1990); received January 23 1990 
  Published    1990 
  Keywords    Boron, Hydroxam ic A cids, Carboxylic Acids, Spirochelates 
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 TEI-XML for    default:Reihe_B/45/ZNB-1990-45b-1123.pdf 
 Identifier    ZNB-1990-45b-1123 
 Volume    45 
3Author    N. Orbert, K. Uhn, M. Anfred, Steim Ann, Gerd Weyers, HerrnRequires cookie*
 Title    Synthese und Eigenschaften von l,3-Diisopropyl-4,5-dimethylimidazolium- 2-car boxy lat. Ein stabiles Carben-Addukt des Kohlendioxids [1]  
 Abstract    The reaction of 2,3-dihydro-l,3-diisopropyl-4,5-dimethylimidazol-2-ylidene (5) with C 0 2 gives the imidazolium-2-carboxylate 6 . The compound can be transformed into the salts of its corresponding Broenstedt acid 8 . The cationic acid chloride 10a is obtained from 6 and thionyl chloride. Chemical properties and spectroscopic data indicate 6 to be less basic than its anionic counterparts, e. g. PhC02 . The X-ray structure of 
  Reference    Z. Naturforsch. 54b, 427—433 (1999); eingegangen am 27. November 1998 
  Published    1999 
  Keywords    Carbenes, Imidazoles, Carboxylic Acids, X-Ray Data 
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 TEI-XML for    default:Reihe_B/54/ZNB-1999-54b-0427.pdf 
 Identifier    ZNB-1999-54b-0427 
 Volume    54 
4Author    B. P. Baranwal, G. K. Parashar, R. C. MehrotraRequires cookie*
 Title    Chemistry of Alkoxo Complexes, Part III * Synthesis and Characterization of Some Mono(carboxylato)mono (alkoxo)nickel(II) Complexes  
 Abstract    A number of mono(carboxylato)mono(alkoxo)nickel(II) complexes of the general for-mula, Ni(OR)(OOCR'), (with R' = C13H07, C15H31 and C17H35) have been synthesized (where R = Me and Pr») by the reactions of nickel methoxide and isopropoxide with the respective carboxylic acids in equimolar ratio and (where R = Et and Bu<) by alcohol interchange reactions. A study of the molecular weight, infra-red and electronic reflect-ance spectra and magnetic susceptibility in addition to elemental analyses has been carried out to throw some light on the probable structure of these derivatives. Extensive studies have been carried out on metal carboxylates and several reviews [1-4] have been published during the last two decades. Following the first successful synthesis of aluminium tri-carboxylates from aluminium isopropoxide [5], the mixed alkoxy carboxylates of a number of metals [6] have also been studied from synthetic as well as structural points of view. A perusal of the literature revealed that while a considerable amount of work has been carried out on the interesting alkoxy carboxylates of earlier transition elements [viz. Ti, Zr and V) [7-9], almost no work has been done on similar derivatives of the latter ones. In view of the above, it was considered of interest to investigate the reactions of nickel (a typical latter transition element) alkoxides with carboxylic acids. It has been found that these reactions are quite facile and yield mixed alkoxy carboxylates of the general formula, Ni(OR)(OOCR') and the anhydrous dicarboxylates, Ni(OOCR')2 according to the molar ratio of the reactants taken. All these compounds have been characterized by elemental analyses, infrared, electronic reflectance spectra, magnetic susceptibility and molecular weight determinations. Experimental 
  Reference    Z. Naturforsch. 34b, 459—473 (1979); received November 29 1978 
  Published    1979 
  Keywords    Nickel Alkoxides, Carboxylic Acids, Nickel Alkoxo Carboxylates, Molecular Weights, IR 
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 TEI-XML for    default:Reihe_B/34/ZNB-1979-34b-0459.pdf 
 Identifier    ZNB-1979-34b-0459 
 Volume    34 
5Author    Akiko Kondoh, Takao OiRequires cookie*
 Title    Interaction of Alkaline Earth Metal Ions with Carboxylic Acids in Aqueous Solutions studied by 13 C NMR Spectroscopy  
 Abstract    1? C NMR spectroscopic measurements of aqueous solutions containing alkaline earth metal chloride and a carboxylic acid have been carried out to acquire some insight into the coordination manners of various carboxylic acids to alkaline earth metal ions. The dependence of the l 3 C NMR signal positions of the carboxylate carbons on the magnesium ion concentration in a magnesium carboxylate system is a good index to understand the coordination manner of the carboxylate ion. The upfield shift of the car-boxylate carbon signal with increasing magnesium ion concentration indicates that the carboxylate ion acts as a bidentate ligand to form a ring structure. Only in the citrate systems, the existence of a rela-tively stable complex is evidenced in which the citrate ion is expected to act as a tridentate ligand. 
  Reference    Z. Naturforsch. 53a, 77—91 (1998); received December 30 1997 
  Published    1998 
  Keywords    13 C NMR Spectroscopy, Carboxylic Acids, Alkaline Earth Metals, Coordination, Chemical Shifts 
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 TEI-XML for    default:Reihe_A/53/ZNA-1998-53a-0077.pdf 
 Identifier    ZNA-1998-53a-0077 
 Volume    53