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1Author    Hiroyuki IshidaRequires cookie*
 Title    Protonation Effect on C-N Bond Length of Alkylamines Studied by Molecular Orbital Calculations  
 Abstract    Molecular orbital calculations were performed for the six saturated alkylamines (CH 3 NH 2 , (CH 3) 2 NH, (CH 3) 3 N, CH 3 CH 2 NH 2 , (CH 3) 2 CHNH 2 , (CH 3) 3 CNH 2), their protonated cations (CH 3 NH 3 + , (CH 3) 2 NH 2 + , (CH 3) 3 NH + , CH 3 CH 2 NH 3 + , (CH 3) 2 CHNH 3 + , (CH 3) 3 CNH 3 +), and (CH 3) 4 N + using the Hartree-Fock, second-order M0ller-Plesset, and density functional theory methods with the 6-311+G(d,p) basis set. Protonation lengthens the C-N bonds of the amines by 0.05 -0.08 A and shortens the C-C bonds of CH 3 CH 2 NH 2 , (CH 3) 2 CHNH 2 , and (CH 3) 3 CNH 2 by ca. 0.01 A. 
  Reference    Z. Naturforsch. 55a, 769—771 (2000); received August 8 2000 
  Published    2000 
  Keywords    Protonation, Amine, HF, DFT 
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 TEI-XML for    default:Reihe_A/55/ZNA-2000-55a-0769.pdf 
 Identifier    ZNA-2000-55a-0769 
 Volume    55 
2Author    Lothar Weber, Eckhard Dobbert, Andreas Rausch, Hans-Georg Stammler, Beate NeumannRequires cookie*
 Title    Synthesis, Structure and Reactivity of 2-Amino-and 2-Imino-2,3-dihydro-1H -1,3,2-diazaboroles  
 Abstract    The 2-halo-2,3-dihydro-1H-1,3,2-diazaboroles RN-CH=CH-N(R)BX (la': R = rBu, X = Br; lb: R = 2,6-Me2C6H.v, X = I) were converted into the 2-amino-2,3-dihydro-\H -1,3,2-diazaboroles RN-CH=CH-N(R)B-NH2 (2a: R = /Bu; 2b: 2,6-Me2C6H3) by treatment with dry gaseous ammonia. Similarly reaction of la' with 2,6-dimethylaniline or /BuNHt afforded the corresponding derivates /BuN-CH=CH-N(rBu)BNHR' (3; R 1 = 2,6-Me2C6H3; 4; R1 = rBu). The treatment of la' with the ethylene diamine adduct of lithium acetylide led to the formation of [rBuN-CH=CH-N(/Bu)BN(H)CH2]2 (5). Lithiation of 2 a and subsequent silylation gave 6 (R1 = SiMe3), which was transformed to the diborolylamine [/BuN-CH=CH-N(rBu)B]2NH (7) upon exposure to la'. Borolylketimine /BuN-CH=CH-N(/Bu)B-N=CPh2 (8) and borolylcar-bodiimide fBuN-CH=CHN(/Bu)B-N=C=N-SiMe3 (9) resulted from la' and Ph2C=NSiMe3 or Me3SiN=C=NSiMe3, respectively. All the new compounds were characterized by elemental analyses as well as spectroscopic data (IR, 'H, n B, i3C NMR, MS). Heterocycle 5 was also subjected to an X-ray diffraction analysis. 
  Reference    Z. Naturforsch. 54b, 363—371 (1999); eingegangen am 25. September 1998 
  Published    1999 
  Keywords    Boron, Diazaboroles, Amines, Imines 
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 TEI-XML for    default:Reihe_B/54/ZNB-1999-54b-0363.pdf 
 Identifier    ZNB-1999-54b-0363 
 Volume    54 
3Author    S. HuRequires cookie*
 Title    One-Pot Preparation of o-Xylylene Diam ine and its Related Am ines  
 Abstract    -ich i K a w a h a ra a n d T ad afu m i U c h im a ru * D epartm ent A m ethod for one-pot preparation of o-xyly-lene diamine, 1,8-diaminomethylnaphthalene, and l,2,4,5-tetrakis(aminomethyl)benzene has been developed. The procedure is simpler and the yield of the reaction is higher than by the conven­ tional method. 
  Reference    Z. Naturforsch. 55b, 985—987 (2000); received May 18 2000 
  Published    2000 
  Keywords    Amines, Halides, Staudinger Reaction 
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 TEI-XML for    default:Reihe_B/55/ZNB-2000-55b-0985_n.pdf 
 Identifier    ZNB-2000-55b-0985_n 
 Volume    55 
4Author    G. S., M. K.Requires cookie*
 Title    Preparation of Spin-Labeled Phosphoroamidates in High Yield Using Imidazole as the Transfer Agent  
 Abstract    The spin-labeled (l-oxyl-2,2,6,6-tetramethyl-4-piperidyl)-phenyl imidazole-1-phos-phonate (4) was used to prepare (l-oxyl-2,2,6,6-tetramethyl-4-piperidyl)phenyl N-alkyl and N-aryl phosphoroamidates (8) in yields generally exceeding 70%. @ > -0 -P -N R 'R " ^ -0 -P -C I OR OR OR 4 8 1 0 Amidates 8 were also prepared from the corresponding chloridate 10. However, in the 
  Reference    (Z. Naturforsch. 32b, 321—327 [1977]; received September 3 1976) 
  Published    1977 
  Keywords    Spin-Labeled Phosphoroamidates, Amines, N itroxyl Moiety, Transphosphorylation 
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 TEI-XML for    default:Reihe_B/32/ZNB-1977-32b-0321.pdf 
 Identifier    ZNB-1977-32b-0321 
 Volume    32 
5Author    Ulrich Knips, Friedo HuberRequires cookie*
 Title    Umsetzungen von Monomethylthalliumdiacetat mit Aminen Reactions of Monomethylthallium Diacetate and Amines  
 Abstract    Decomposition of MeTl(OAc)2 (Me = CH3, HO Ac = CH3COOH) in methanol in the presence of amines, like 2-, 3-and 4-picoline, benzylamines, dimethylaniline causes mainly N-methylation; the concurring O-methylation of acetate, giving MeOAc, is only of minor importance. The rate of N-methylation increases in the series 2-picoline < pyridine < 3-picoline < 4-picoline < dimethylaniline < dime thy lbenzylamine. Picolinic acid and MeTl(OAc)2 (molar ratio 1:1) react to give 25% N-methylpicolinic acid and 75% MeOAc; when the molar ratio was at least 2:1, a 1:1 mixture of N-methylpicolinic acid and the methylester of picolinic acid was produced. These results and rate changes in different solvents are explained by assuming MeT10Ac+ being the active methylthallium electro-phile. Der geschwindigkeitsbestimmende Schritt beim Zerfall von Monomethylthalliumverbindungen MeTlX2 (Me = CH3, X = z.B. CH3COO) in Lösung kann als S^-Angriff des jeweils stärksten Nukleo-phils oder konkurrierender Nukleophile (Anion und Solvensmoleküle) im Reaktionssystem an der Tl-gebundenen Methylgruppe von MeTlX+ verstanden werden, das im Dissoziationsgleichgewicht mit MeTlX2 vorliegt [1,2]. Weitere Untersuchungen der Zerfallsreaktion in Gegenwart organischer Amine, über die wir nachfolgend berichten, bekräftigen diese Vorstellung und erlauben Aussagen über den Einfluß von Nukleophilie und Basizität der Reak-tanden bei diesen Zersetzungsreaktionen. Ergebnisse Beim Zerfall von MeTl(OAc)2 in methanolischer Lösung in Gegenwart von 2-, 3-und 4-Picolin ent-standen in allen Fällen als Hauptprodukte die ent-sprechendenN-Methylpicoliniumacetate und T10 Ac. Daneben bildete sich Essigsäuremethylester (MeOAc) in einer von der verwendeten Base ab-hängigen Menge: So wurden bei Verfolgung des Zerfalls von MeTl(OAc)2 in Gegenwart von 2-bzw. 3-bzw. 4-Picolin nach 20 h bei einer Reaktions-temperatur von 30 °C etwa 15 bzw. 5 bzw. 2-3% MeOAc (bezogen auf die berechnete maximale Menge von MeOAc als einziges Zerfallsprodukt) gefunden. 
  Reference    Z. Naturforsch. 38b, 434—436 (1983); eingegangen am 20. Dezember 1982 
  Published    1983 
  Keywords    Monomethylthallium Diacetate, Amines, Methylation, Reaction Rate 
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 TEI-XML for    default:Reihe_B/38/ZNB-1983-38b-0434.pdf 
 Identifier    ZNB-1983-38b-0434 
 Volume    38 
6Author    RostislavD. Lampeka, Zam Ira, D. Uzakbergenova, VictorV. SkopenkoRequires cookie*
 Title    Spectroscopic and X-Ray Investigation of Cobalt(III) Complexes with 2-Oximinocarboxylic Acids  
 Abstract    Mixed complexes of Co(III) with 2-oximinopropionic (H 2A) or 2-oximino-3-phenylpropionic (H 2B) acid and different amine (imidazole, benzimidazole, pyridine, yS-picoline, y-picoline) are reported. Characterization of the complexes was based upon ele­ mental analysis, conductivity and JR, 'H N M R, and electronic absorption spectra, and X-ray diffraction analysis. The organic ligands behave as 0 ,N donors via the carboxyl oxygen and the oxime nitrogen atoms. A trans-octahedral structure has been assigned to the bis(2-oximino-carboxylato)bis(am ine)cobalt(III) on the basis of 'H N M R data. The crystal and molecular structures of the complexes rra«5-[bis(2-oximinopropionato)bis-(imidazole)]-(I) and ^ • a«5'-[bis(2-oximinopropionato)bis(pyridine)]cobalt(III) (II) were deter­ mined. I crystallizes in space group P 2/« with a = 14.167(2), b = 8.774(_1), c = 14.785(2)Ä, ß = 113.37(1)°, Z = 4, Dca)c = 1.568 g e m '3. II crystallizes in space group P 1 with a = 9.122(2), b = 10.038(2), c = 11.759(2) A, a = 69.95(1)°, ß = 67.47(2)°, y = 69.49(2)°, Z = 2, Dcalc = 1.547 g-cm~3. The structures were refined to unweighted R factors of 0.036 and 0.028, respec­ tively. The coordination sphere around Co is pseudo-octahedral with the 2-oxim inopropionato ligands occupying four equatorial positions, and the amines in axial po­ sitions. 
  Reference    Z. Naturforsch. 48b, 409—417 (1993); received November 2 1992 
  Published    1993 
  Keywords    Cobalt, Oximiocarboxylic Acid, Amine, X-Ray 
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 TEI-XML for    default:Reihe_B/48/ZNB-1993-48b-0409.pdf 
 Identifier    ZNB-1993-48b-0409 
 Volume    48 
7Author    BerndW. Rackmeyer1 ', Saqib Alib, Wolfgang Storch0, Martina VosteencRequires cookie*
 Title    2-[N,N-Bis(trimethylstannyl)amino]pyridine and Bis[N-(N-trimethyIsiIyI- 2-aminopyridyI)]dimethyltin -Intramolecular N-Sn Co-ordination  
 Abstract    2-[N,N-Bis(trimethylstannyl)amino]pyridine (1), bis[N-(N-trimethylsilyl-2-aminopyridyl)]-dimethyltin (2) and bis[N-(N-trimethylsilyl-2-amino-3-methyl-pyridyl)]dimethyltin (3) were prepared and characterized by 'H, i3C, l5N, 29Si and ll9Sn NMR spectroscopy. In the case of 1, intramolecular pyridine-N-Sn co-ordination was established by the low temperature ll9Sn NMR spectra which show two resonance signals, one for a penta-co-ordinate and one for a tetra-co-ordinate tin site. In the cases of 2 and 3, intramolecular pyridine-N-Sn co-ordination follows conclusively from l3C, l5N and ll9Sn NMR parameters. In contrast with the known behaviour of the corresponding trimethyltin derivative, the methyl group in 3-position of the pyridine ring does not prevent this type of co-ordination in 3. 
  Reference    Z. Naturforsch. 54b, 1165—1169 (1999); received June 17 1999 
  Published    1999 
  Keywords    Tin, Amines, Pyridine, Co-ordination, NMR Data 
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 TEI-XML for    default:Reihe_B/54/ZNB-1999-54b-1165.pdf 
 Identifier    ZNB-1999-54b-1165 
 Volume    54 
8Author    Bernd Wrackmeyer3, Jürgen Weidinger3, Heinrich Nöthb, Wolfgang Storchb, Thomas Seifertb, Martina VosteenbRequires cookie*
 Title    Determination of Coupling Signs 17 (119Sn, 15N ) and 2/ ( 119Sn, 117Sn) in Trimethylstannylamines  
 Abstract    The l5N-labelled trimethylstannylamines 1 -3 [(M e3Sn)3N, (M e3Sn)2NPh, (M e3Sn)2N-BCgHi4 (BCgHi4 = 9-borabicyclo[3.3.0]nonyn and the non-labelled 4, Me3 Sn-N(BC8Hi4)2 , were prepared and studied by 1H, 1 C, l5N and l9Sn NMR. The l5N ultrahigh resolution NMR spectra of 1 revealed otherwise unobserved parameters such as 2/ (15N ,S n ,'C) and the isotope induced chemical shift 2 zAl2/l3C (l5N). ll9Sn NM R spectra of 1, recorded under similar con­ ditions, also show new parameters such as V (' |ySn,N,Sn,l3C) which are not resolved in the non-labelled derivative. By using various types o f two-dimensional heteronuclear shift corre­ lations, absolute coupling signs o f l7 (l l9 Sn,15N) (all < 0) in 1 -3 were determined. By the same techniques it proved possible to confirm the negative sign o f :7(Sn,Sn) (-195.4 Hz) in 1. In contrast, the coupling constants 27(Sn,Sn) for 2 (+71.7) and 3 (+62.0) possess a positive sign. This sign inversion, observed here for the first time for apparently similar compounds, demonstrates the enormous influence o f substituents on the nature o f the lone pair o f electrons at the nitrogen atom. It also shows that these experiments for sign determinations o f coupling constants are necessary in order to interpret these data correctly. 
  Reference    Z. Naturforsch. 53b, 1494—1500 (1998); received July 30 1998 
  Published    1998 
  Keywords    Tin, Amines, NM R Data, Ultrahigh Resolution, Coupling Sign Determination 
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 TEI-XML for    default:Reihe_B/53/ZNB-1998-53b-1494.pdf 
 Identifier    ZNB-1998-53b-1494 
 Volume    53 
9Author    Christoph GierschRequires cookie*
 Title    Photophosphorylation by Chloroplasts: Effects o f Low Concentrations o f Ammonia and Methylamine  
 Abstract    Intact chloroplasts exposed to hypotonic assay conditions are capable o f photophosphorylating exogenous ADP. The rate o f phosphorylation by these unbroken plastids is increased by 10—50% upon the addition o f low concentrations (< mM) o f N H 3 or C H 3 N H 2. Stimulation o f phosphory­ lation is abolished by washing chloroplasts with MgCl2. Evidence is presented that washing re­ moves a factor responsible for amine-induced increase o f A T P production and that this factor is associated with the thylakoid membrane. Addition o f CH3 N H 2 increased the proton permeability of the thylakoid membrane o f unbroken and washed chloroplasts during the light/dark transition. Hence, differences o f the membrane permeability for protons between the two preparations seem not to be responsible for an increase o f A T P production upon the addition o f amines. Stimulation of photophosphorylation by methylamine is observed even at light itensities which do not saturate the proton motive force, which in turn is reduced upon the addition o f the uncoupler. Apparently, phosphorylation can be stimulated, although the limiting driving force is diminished. It is con­ cluded that phosphorylation by unbroken chloroplasts under low light illumination is limited kinetically, not energetically. Consequences o f these findings for observation made with intact chloroplasts are discussed. 
  Reference    Z. Naturforsch. 37c, 242—250 (1982); received December 23 1981 
  Published    1982 
  Keywords    Photophosphorylation, Uncoupling, Amines, Proton Motive Force, Chloroplasts, Chemiosmotic Theory 
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 TEI-XML for    default:Reihe_C/37/ZNC-1982-37c-0242.pdf 
 Identifier    ZNC-1982-37c-0242 
 Volume    37 
10Author    G. Lyn, R. Banks, A. Lan, J. Buglass, S. W. AterhouseRequires cookie*
 Title    Amines in the Marking Fluid and Anal Sac Secretion of the Tiger, Panthera tigris  
 Abstract    Analysis of the marking fluid of two tigers (one Bengal and one Sumatran) by GC using an amine-specific column and a nitrogen-specific detector has shown the presence of the follow­ ing amines: ammonia, methylamine, dimethylamine, trimethylamine, triethylamine, propyl­ amine, and butane-1,4-diamine (putrescine). In contrast to previously published reports, we were unable to detect 2-phenylethylamine. The anal sac secretion was found to have a similar amine content. 
  Reference    Z. Naturforsch. 47c, 618—620 (1992); received March 12 1992 
  Published    1992 
  Keywords    Amines, Anal Sac Secretion, Marking Fluid, Scent-Marking, Tiger 
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 TEI-XML for    default:Reihe_C/47/ZNC-1992-47c-0618.pdf 
 Identifier    ZNC-1992-47c-0618 
 Volume    47 
11Author    G. S.Requires cookie*
 Title    Reactions of tert-Butylperoxy Esters, XIII Reactions of Dialkyl ie/t-Butylperoxy Phosphates with A m inesa,b,c  
 Abstract    The interaction of dialkyl tert-butylperoxy phosphates, (R 0)2P (0)0 0 C M e3 (1) with primary and secondary cycloalkylamines, R 'R " N H , R' = cyclo-CeH^, R " = H ; R '= R " = cyclo-C6H n (2) in the presence and absence of water, produces the corre­ sponding dialkyl cycloalkyl ammonium phosphates, (R 0)2P (0) 0 -N +H 2R " R / (3), and ierJ-butanol. In carbon tetrachloride the reaction produces in addition to 3 the corre­ sponding cyclohexylammonium chloride, discussed. 
  Reference    (Z. Naturforsch. 30b, 724—731 [1975]; received February 17 1975) 
  Published    1975 
  Keywords    fer£-Butylperoxy Esters, Dialkyl Cycloalkylammonium Phosphates, feri-Butylperoxy Phosphates, Dialkyl Phosphates, Amines 
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 TEI-XML for    default:Reihe_B/30/ZNB-1975-30b-0724.pdf 
 Identifier    ZNB-1975-30b-0724 
 Volume    30