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1Author    Ralf Janda, Gert HellerRequires cookie*
 Title    1 B—NMR-spektroskopische Untersuchungen an wäßrigen Polyboratlösungen n B NMR Spectroscopic Studies on Aqueous Polyborate Solutions  
 Abstract    The U B nuclear magnetic resonance spectra of sodium, potassium and ammonium polyborates in aqueous solutions, -as a function of concentration and pH -, provide information of the hydrolysis equilibria. Two n B NMR lines are observed in aqueous solutions of Na[B506(0H)4], K[B506(0H)4] and NH4[B506(0H)4]. Only one n B NMR line is recorded in aqueous solutions of (NH4)2[B4Os(OH)4] and Na2[B4Os(OH)4]. The results of the U B NMR spectra are discussed and compared with the results obtained from Raman studies of aqueous polyborate solutions. 
  Reference    Z. Naturforsch. 34b, 1078—1083 (1979); eingegangen am 13. März/27. April 1979 
  Published    1979 
  Keywords    n B NMR, Borates, Polyborates, Hydrolysis, Equilibria 
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 TEI-XML for    default:Reihe_B/34/ZNB-1979-34b-1078.pdf 
 Identifier    ZNB-1979-34b-1078 
 Volume    34 
2Author    HansH. KarschRequires cookie*
 Title    Funktionelle Trimethylphosphanderivate, XVII [1]  
 Abstract    Methyl-bis(dimethylphosphinomethyl)phosphan, (Me2PCH2)2PMe Functional Derivatives of Trimethylphosphane, XVII [1] Methyl-bis(dimethylphosphinomethyl)phosphane, (Me2PCH2)2PMe (Me 2 PCH2)2PMe (3) is obtained from MePCl 2 (2a) or MeP(OPh) 2 (2b) and LiCH 2 PMe 2 (1). The oxides [Me 2 P(0)CH 2 ] 2 PMe (4) and [Me 2 P(0)CH 2 ] 2 P(0)Me (5), are formed on the reaction with air. Quaternisation with Mel gives the salts [(Me3PCH2)2PMe]l2 (6) and [(Me3PCH2)2PMe2]l3 (12). For comparison, also the isoelectronic (Me3SiCH2)2PMe (7), and (Me3SiCH2)2P 4 Bu (8), are synthesized and transformed to their methylphosphonium salts 10 and 11. WithCH 2 Br 2 , 3 forms the six-membered heterocycle [MeP(CH 2 PMe2)2CH 2 ]Br2 (13 a), which could not be isolated in a pure state, however. 3 may be metalated by LiBu: Li[Me2PCHP(Me)CH2PMe2] (15), is obtained, but a second metalation step could not be observed. The hydrolysis of 12 under unusual mild conditions (H2O or H2O/CH3OH) gives [Me2P(0)CH 2 PMe3]I (16), and [Me 4 P]I (17), as main products. Properties and NMR data of the new compounds are described. 
  Reference    Z. Naturforsch. 37b, 284—291 (1982); eingegangen am 12. Oktober 1981 
  Published    1982 
  Keywords    Triphosphane (PCPCP), Phosphonium Salts, Hydrolysis, NMR Spectra 
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 TEI-XML for    default:Reihe_B/37/ZNB-1982-37b-0284.pdf 
 Identifier    ZNB-1982-37b-0284 
 Volume    37 
3Author    Walter Tötsch, Fritz SladkyRequires cookie*
 Title    The Hydrolysis of TeF6  
 Abstract    The stereochemistry of the hydrolysis of tellurium hexafluoride has been followed up by 125 Te NMR spectroscopy for each individual step of replacement of fluorine by a hydroxy group. 
  Reference    Z. Naturforsch. 38b, 1025—1026 (1983); eingegangen am 18. März 1983 
  Published    1983 
  Keywords    Tellurium Hexafluoride, Hydrolysis, Stereochemistry, 125 Te NMR Spectra 
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 TEI-XML for    default:Reihe_B/38/ZNB-1983-38b-1025_n.pdf 
 Identifier    ZNB-1983-38b-1025_n 
 Volume    38 
4Author    Marcus Branda, Albert Fringsd, Peter Jenkner0, Robert Lehnerta, HansJürgen Mettemicha, Jaroslaw Monkiewiczd, Jürgen Schramc, HülsStructura Gmbh, Friedrich Von, Heyden PlatzRequires cookie*
 Title    NMR-spektroskopische Untersuchungen zur Hydrolyse von funktionellen Trialkoxysilanen NMR-Spectroscopic Investigations on the Hydrolysis of Functional Trialkoxysilanes  
 Abstract    The hydrolysis of functional trialkoxysilanes was studied under various conditions by 'H NMR spectroscopy. The silane concentration was 1 -2% by weight in a water/acetone-system. Under these conditions, the reaction was found to be first order. In detail, influence of pH, grade of stirring, and size and structure of functional groups of the alkyltrialkoxysilanes were investigated in order to compare the relative reaction rates of the different compounds. 
  Reference    Z. Naturforsch. 54b, 155—164 (1999); eingegangen am 9. September 1998 
  Published    1999 
  Keywords    Organofunctional Silanes, Trialkoxysilanes, Tetraalkoxysilanes, Hydrolysis, Siloxanes 
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 TEI-XML for    default:Reihe_B/54/ZNB-1999-54b-0155.pdf 
 Identifier    ZNB-1999-54b-0155 
 Volume    54 
5Author    Zsigmond Ekler, FerencD. UtkaRequires cookie*
 Title    Chemical Reactivity and Safener Activity of Acetal Compounds  
 Abstract    Although detailed examinations have been published on structure-activity relationships of herbicide safeners, only a few data are available on chemical reactivity-safener activity rela­ tionships. Chemical reactivity o f acetamide type compounds as well as their safener activity against thiocarbamate herbicides change with the number o f chlorine substituents in the order: non-chlorinated < monochloro < dichloro. Several compounds of another chemical group, acetals (e.g. MG-191, 2-dichloromethyl-2-methyl-l,3-dioxolane), are also effective safeners for thiocarbamate herbicides. According to our growth room studies, the safener activity o f ace­ tals also increases with increasing chlorine content up to two chlorine atoms on the same car­ bon. A number of differently chlorinated acetals have been synthesized and their acid-cata­ lyzed hydrolysis rate determined in order to establish a relationship between their bioactivity and chemical reactivity. The hydrolysis rate order of acetals containing no, one or two chlorine atoms: non-chlorinated > monochloro > dichloro, is just the opposite than what has been found for acetamides. Thus, safener activity of acetals increases with decreasing chemical reac­ tivity. The opposite reactivity order of acetamides and acetals can be explained by the different mechanisms of their hydrolysis. Dichloroacetals may not be effective safeners in their original structure. In plants, however, they can be biologically activated to active safeners by a trans­ formation other than hydrolysis. 
  Reference    Z. Naturforsch. 46c, 810—814 (1991); received March 26 1991 
  Published    1991 
  Keywords    Acetals, Hydrolysis, Herbicides, Herbicide Safeners, Zea mays (L) 
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 TEI-XML for    default:Reihe_C/46/ZNC-1991-46c-0810.pdf 
 Identifier    ZNC-1991-46c-0810 
 Volume    46 
6Author    MastjnobuRequires cookie*
 Title    Solvent Deuterium Isotope Effect on Hydrolysis of Nd3+ Ion  
 Abstract    Ma e d a *, T o sh ih ik o A m a y a , and H id e t a k e K a k ih a n a The hydrolysis equilibria of Nd3+ ion in light-and heavy-water solutions containing 3 mol dm-3 (Li)C104 as an ionic medium were studied at 25 °C by measuring the lyonium-ion concentration with a glass electrode. Analysis of the em f data indicated the forma­ tion of only the mononuclear complex Nd(OL)2+ in both light and heavy water. The formation constant was smaller in D 2O (log */?2,i = -— 16.54 ± 0.04) than in H 2O (log *ß2,i = — 15.90 ± 0.06). The formation constant K<z,\ for the heavy-water system (log i?2,i = 12.28) had a larger value than that for the light-water system (log K%t 1 = 11.86). 
  Reference    (Z. Naturforsch. 32b, 1493—1495 [1977]; received August 30 1977) 
  Published    1977 
  Keywords    Deuterium Isotope Effect, Formation Constant, H eavy Water, Hydrolysis, Neodymium Ion 
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 TEI-XML for    default:Reihe_B/32/ZNB-1977-32b-1493_n.pdf 
 Identifier    ZNB-1977-32b-1493_n 
 Volume    32 
7Author    RajK. Bansal, Neelam Gandhi, A. Schmidpeter, K. KaraghiosoffRequires cookie*
 Title    Synthesis of [l,2,4,3]Triazaphospholo[l,5-a]pyridines+  
 Abstract    Condensation o f 1,2-diaminopyridinium iodides with tris(dimethylamino)phosphine gives [l,2,4,3]triazaphospholo[l,5-a]pyridines 2a-d. Diethylamine adds to the N=P bond o f 2a, b only if the phosphorus is oxidized at the same time. Hydrolysis of 2 a opens the triazaphos-phole ring at its 2,3-bond. 
  Reference    Z. Naturforsch. 50b, 558 (1995); received October 21 1994 
  Published    1995 
  Keywords    l, 3-Diaza-2-phosphaindolizines, NM R Spectra, Mass Spectral Fragmentation, Hydrolysis, 1, 2-Addition Reactions 
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 TEI-XML for    default:Reihe_B/50/ZNB-1995-50b-0558.pdf 
 Identifier    ZNB-1995-50b-0558 
 Volume    50