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21Author    B. Gyurcsik3, N. Buzásb, T. Gajdab, L. Nagyb, E. Kuzmannc, A. Vértesc, K. BurgerbRequires cookie*
 Title    The Stability and Structure of Complex Species Formed in Equilibrium Reactions of Diethyltin(IV) with N-D-Gluconylamino Acids in Aqueous Solution  
 Abstract    Complex formation equilibria of diethyltin(IV) with five TV-D-gluconylamino acids in aque­ ous solution (I = 0.1 M, NaC104) were studied and the stabilities of the species were deter­ mined by potentiometric titrations. Diethyltin(IV) complexes of a-amino acid derivatives are water-soluble in the physiological pH range, while in the presence of 7V-D-gluconyl-/?-alanine a precipitate is formed, which dissolves with increasing pH. 13C NM R measurements showed that in the /V-D-gluconyl-a-amino acid complexes the ligand is coordinated through its depro-tonated carboxylate oxygen, amide nitrogen and C(2)-hydroxy group, while for the soluble /V-D-gluconyl-/?-alanine complex the ligand is coordinated via the deprotonated carboxylate and C(3)-, C(4)-, C(5)-hydroxy groups. Mössbauer measurements reflected the geometry of the complexes formed. 
  Reference    Z. Naturforsch. 50b, 515—523 (1995); received September 28 1994 
  Published    1995 
  Keywords    Diethyltin(IV), /V-D-Gluconylamino Acid Complexes, Potentiometry, Mössbauer Spectra, NM R Spectra 
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 TEI-XML for    default:Reihe_B/50/ZNB-1995-50b-0515.pdf 
 Identifier    ZNB-1995-50b-0515 
 Volume    50 
22Author    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 
23Author    Bernd Wrackmeyer, HeidiE. Maisel, Wolfgang MiliusRequires cookie*
 Title    2-Stannylpyridine-Borane Adducts -Multinuclear Magnetic Resonance Study and X-Ray Structure Determination of a l,4-Dihydro-4 a,l,4-azastannabora-naphthalene Derivative  
 Abstract    The adduct formation between 2-trimethylstannyl-pyridine (1) and triethylborane, leading to 2a, and 9-borabicyclo[3.3.1]nonane, leading to 2b, was studied by 'H, " B, 13C, 15N and 119Sn NMR in solution. Changes in the magnitude of the coupling constants 7(119Sn, 13C), with respect to the data for 1, were analysed. The absolute signs have been determined [all coupling constants " /(119Sn,13C) to methyl and pyridine carbon atoms in 1 to 3 possess a negative sign and the same is true for "y(119Sn,*H) of the pyridine hydrogen atoms] by various two-dimensional NMR experiments, and attributed to the influence of the lone pair of electrons at the nitrogen atom in 1. The NMR spectroscopic results for the 1,4-dihydro-4a,l,4-azastannabora-naphthalene derivative 3, in which structural fragments are present analogous to those in the borane adducts 2, correspond to those for 1 and 2a,b. The molecu­ lar structure of 3 has been determined by X-ray analysis [orthor' nombic; P 2 i2121; a = 713.9(2), b = 1566.0(2), c -1578.4(2) pm]. Solid-state 13C and 119Sn CP/MAS NM R spectra prove that the molecular structures of 3 in the solid state and in solution are very similar. 
  Reference    Z. Naturforsch. 50b, 809—815 (1995); received 
  Published    1995 
  Keywords    O ctober 28, 1994 2-Trimethylstannyl-pyridine, Borane Adducts, Heterobicycle, X-Ray, NM R Spectra 
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 TEI-XML for    default:Reihe_B/50/ZNB-1995-50b-0809.pdf 
 Identifier    ZNB-1995-50b-0809 
 Volume    50 
24Author    LutzD. Ahlenburg, A.Lexander WolskiRequires cookie*
 Title    Oligophosphan-Liganden, XXXIX*  
 Abstract    (lS,2S)-fraw s-C yclopentan-l,2-diyl-bis(phosphan), C5H 8(P H 2)2? durch Reduktion eines diastereomerenreinen Cyclopentandiyl-bis(dioxaphospholans) O ligophosphine Ligands, X X X IX . (1 5,25')-rra/t5-C yclopentane-l,2-diyl-bis(phosphine), C5FI8(P H 2)2, by R eduction of a D iastereom erically Pure C yclopentanediyl-bis(dioxaphospholane) C hristine E ckert, The title compound (S, S)-2, has been obtained by reduction with Li[A lH 4] o f the cyclopen-tane-l,2-diyl-bis(l',3',2'-dioxaphospholane) (1 5 ,2 S)-frans-C5H 8[P (0 C H (C 0 2Pr-/)-(/ ?) -)2]2, (S, 5")-l, which itself was isolated in diastereomerically pure form (X-ray structure analysis) from the reaction between rac, /rfl«s-CsH8(PCl2)2 and (2 /? ,3 /?)-(+)-d iiso p ro p y l tartrate. C l e a v a g e o f (S ,.S)-1 w i t h P C U y i e l d e d a n u n s e p a r a b l e m i x t u r e o f (1 S , 2 S W r a n s -C 5 H 8(P C l 2) 2 a n d (4 R .5 R) -C l P [ 0 C H (C 0 2P r -t) -]2. 
  Reference    Z. Naturforsch. 50b, 1004—1008 (1995); eingegangen am 30. N ovem ber 1994 
  Published    1995 
  Keywords    Chiral Bis(phosphine) Reduction of P -O, X-Ray, Mass Spectra, NM R Spectra 
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 TEI-XML for    default:Reihe_B/50/ZNB-1995-50b-1004.pdf 
 Identifier    ZNB-1995-50b-1004 
 Volume    50 
25Author    Rolf Minkwitz, Ulrike Lohmann, Hans PreutRequires cookie*
 Title    Primäre und sekundäre Ethyl-und /-Propylsulfoniumsalze sowie Kristallstruktur von /-C3H7SH2+SbF6 [1] Prim ary and Secondary Ethyl and /-Propyl Sulfonium Salts and Crystal Structure of /-C3H 7SH2+SbF6-[1]  
 Abstract    The synthesis of salts of the type R"SH3_"+MF6~ (R = C2H 5, i-C3H 7; n = 1, 2; M = As, Sb) by protonation of the corresponding thiols and sulfides in the superacid systems HF/M F5 is reported. The salts have been characterized by vibrational and NM R spectroscopic methods. Isopropylsulfonium hexafluoroantimonate is the first known example of a sulfonium salt, for which a SH bond distance has been determined by a crystal structure analysis, i-C3H 7SH 2+SbF6" crystallizes in the monoclinic space group P2i/m with a = 568.0(4), b = 801.1(6), c = 1019.7(8) pm, ß = 82.63(6) °, with two formula units per unit cell. 
  Reference    Z. Naturforsch. 51b, 277 (1996); eingegangen am 6. Juli 1995 
  Published    1996 
  Keywords    Primary and Secondary Sulfonium Salts, Vibrational Spectra, NM R Spectra, Crystal Structure 
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 TEI-XML for    default:Reihe_B/51/ZNB-1996-51b-0277.pdf 
 Identifier    ZNB-1996-51b-0277 
 Volume    51 
26Author    Rolf Minkwitz, Jens Jakob, Andreas Kornath, Hans PreutRequires cookie*
 Title    Uber die Darstellung, spektroskopische Charakterisierung und Kristallstruktur von Trifluormethylazosulfbn-N,N-dimethylamid (CH3)2N S (0)2NNCF3 On the Preparation, Spectroscopic Characterization and Crystal Structure of Trifluoromethylazosulfon-N,N-dimethylamid (C H 3)2N S (0 )2NNCF3  
 Abstract    The reaction of Trifluoronitrosomethan with (CH3)2NS(0)2N H 2 in T H F and Na2C 0 3 as 
  Reference    Z. Naturforsch. 51b, 557—562 (1996); eingegangen am 10. O ktober 1995 
  Published    1996 
  Keywords    Trifluormethylazosulfon-N, N-dimethylamid, Vibrational Spectra, NM R Spectra, Mass Spectra, Crystal Structure 
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 TEI-XML for    default:Reihe_B/51/ZNB-1996-51b-0557.pdf 
 Identifier    ZNB-1996-51b-0557 
 Volume    51 
27Author    Michael Binnewies, Joseph Grobe, Duc Le VanRequires cookie*
 Title    Reaktive E = C (p—p);r-Systeme, IV [1]: Retro-Dienspaltung von Diels-Alder-Addukten des Phosphaalkens F3CP=C F2 Reactive E = C (p-p)Tr-Systems, IV [1]: Retro Diene Cleavage of Diels-Alder Adducts of the Phosphaalkene F3CP=CF2  
  Reference    Z. Naturforsch. 40b, 927 (1985); eingegangen am 6. März 1985 
  Published    1985 
  Keywords    Retro D ien e R eactions, P hospha-H eterocycles, Mass Spectra, Therm ochem ical D ata, NM R Spectra 
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 TEI-XML for    default:Reihe_B/40/ZNB-1985-40b-0927.pdf 
 Identifier    ZNB-1985-40b-0927 
 Volume    40 
28Author    Ralf Sonnenburg, Ion Neda, Axel Fischer, PeterG. Jones, Reinhard SchmutzlerRequires cookie*
 Title    Verbindungen mit dem 5,6-Benzo-l,3,2-diazaphosphorinan-4-on-Ringsystem: Synthese von 2-Chlor-, 2-N,N-dimethylamino-und 2-Bis-(2-chlorethyl)amino- substituierten Derivaten mit drei-und vierfach koordiniertem Phosphor Compounds Involving the 5,6-Benzo-l,3,2-diazaphosphorinane-4-one Ring System: Synthesis of 2-Chloro-, 2-N,N-dimethylamino-and 2-Bis-(2-chloroethyl)amino- Substituted Derivatives with Three-and Four-Coordinated Phosphorus  
  Reference    Z. Naturforsch. 49b, 788—8 (1994); eingegangen am 16. D ezem ber 1993 
  Published    1994 
  Keywords    5, 6-Benzo-l, 3, 2-diazaphosphorinan-4-one Derivatives, Dialkylamino Substituents, Bis-(2-chloroethyl)amino Substituents, Platinum Complex, NM R Spectra 
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 TEI-XML for    default:Reihe_B/49/ZNB-1994-49b-0788.pdf 
 Identifier    ZNB-1994-49b-0788 
 Volume    49 
29Author    Neda, Michael Farkens, Holger Thönnessen, PeterG. Jones, Reinhard SchmutzlerRequires cookie*
 Title    Zur Chemie der l,3,5-Triaza-2-phosphorinan-4,6-dione. Teil X*. Umsetzungen von 2-Hydro  
 Abstract    l,3,5-trimethyl-l,3,5-triaza-2-oxo-2A4-phosphorinan-4,6-dion mit Triazin-Derivaten sowie mit einigen Aldehyden Chemistry of the l,3,5-Triaza-2-phosphorinan-4,6-diones. Part X*. Reactions of 2-H ydro-1,3,5-trim ethyl-1,3,5-triaza-2-oxo-2A4-phosphorinan-4,6-dione with Triazine Derivatives and with Some Aldehydes Ion 
  Reference    Z. Naturforsch. 50b, 1833—1 (1995); eingegangen am 8. Mai 1995 
  Published    1995 
  Keywords    1, 3, 5-Trimethyl-Substituted l, 3, 5-Triaza-2A 4 -phosphorinan-4, 6-diones, NM R Spectra, Mass Spectra, X-Ray 
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 TEI-XML for    default:Reihe_B/50/ZNB-1995-50b-1833.pdf 
 Identifier    ZNB-1995-50b-1833 
 Volume    50 
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