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1Author    G.Requires cookie*
 Title    Reactivity and Spectroscopic Properties of Acylisonitrile Chromium Pentacarbonyls  
 Abstract    The title compounds react with nucleo­ philes similar to activated carboxylic acid derivatives. There is no indication of acyliso­ nitrile fragments on either thermolysis or mass spectrometry. 
  Reference    (Z. Naturforsch. 30b, 982—983 [1975]; eingegangen am 24. Juni 1975) 
  Published    1975 
  Keywords    Solvolysis, 13C NMR, Mass Spectra 
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 TEI-XML for    default:Reihe_B/30/ZNB-1975-30b-0982_n.pdf 
 Identifier    ZNB-1975-30b-0982_n 
 Volume    30 
2Author    Requires cookie*
 Title    Zur Struktur einer Substanz  
 Abstract    aus dem Fruchtfleisch von M elia A zad irach ta Linn * The Structure o f a Compound Isolated from the Fruit Pulp of M e lia A z a d ir a c h ta L in n * S a l i m u z z a m a n S i d d iq u i u n d T a s n e e m N a h id W a h e e d Postgraduate Institute, K arach i U niversity, Karachi, Pakistan J ü r g e n L ü c k e u n d W o l f g a n g V o e l t e r The isolation of a triterpenoid from the fru it pulp of M elia azadirachta Linn is described. Its structure is identified by synoptical evaluation of the data of elemental analysis, iH NMR, 13C NMR, A B S and IR spectra. 
  Reference    (Z. Naturforsch. 30b, 961—964 [1975]; eingegangen am 19. September 1975) 
  Published    1975 
  Keywords    Terpenes, 1H NMR, 13C NMR, Abs, IR 
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 TEI-XML for    default:Reihe_B/30/ZNB-1975-30b-0961.pdf 
 Identifier    ZNB-1975-30b-0961 
 Volume    30 
3Author    I. Mester, D. Bergenthal, J. ReischRequires cookie*
 Title    Inhaltsstoffe  
 Abstract    aus Clausena anisata (Willd.) Oliv. (Rutaceae), III [1,2] 13 C-NMR-Spektren des Mupamins, des Carbazols und einiger Carbazol-Derivate Constituents of Clausena anisata (Willd.) Oliv. (Rutaceae), III [1, 2] 13 C NMR Spectra of Mupamine, Carbazole and Some Carbazole Derivatives The fully interpreted 13 C NMR spectra of mupamine, carbazole, and of some carbazole derivatives are reported. In einer vorangegangenen Veröffentlichung haben wir die Isolierung und Strukturaufklärung des Mupamins (4) beschrieben [2], Zum Zwecke der Strukturaufklärung wurde seinerzeit auch das X H-breitbandentkoppelte 13 C-NMR-Spektrum aufge-nommen. Eine Durchsicht der Literatur nach 13 C-NMR-Daten von Carbazol bzw. Carbazol-Deri-vaten zeigte, daß über 13 C-Verschiebungen des Indols [3] sowie einfacher Indol-Derivate, bzw. Carbolin-Alkaloide [4] zahlreiche Veröffentlichungen vorliegen, aber weder über die 13 C-NMR-Daten des Carbazols noch seiner einfachen Derivate Informa-tionen vorhanden waren [5]. Für die völlige Auf-schlüsselung des Mupamin-Spektrums wurden die Spektren des Carbazols und einiger Modellsubstan-zen benötigt. Derartige Modellsubstanzen, das sind die Tetrahydrocarbazole la-d und 2, sowie die Carbazole 3b-d. fielen nun bei der Gegensynthese des Mupamins an [6]. 
  Reference    Z. Naturforsch. 34b, 650—652 (1979); eingegangen am 26. Januar 1979 
  Published    1979 
  Keywords    Mupamine, Carbazole, Carbazole Derivatives, 13C NMR 
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 TEI-XML for    default:Reihe_B/34/ZNB-1979-34b-0650_n.pdf 
 Identifier    ZNB-1979-34b-0650_n 
 Volume    34 
4Author    Claude Nicolau, Knut HildenbrandRequires cookie*
 Title    3C-Nuclear Magnetic Resonance Investigations of Xanthine and Some of its N-Methylated Derivatives  
 Abstract    The 13C-Nuclear Magnetic Resonance spectra of xanthine, 1,3-dimethyl-xanthine (theophylline), 3,7-dimethyl xanthine (theobromine) and 1,3,7-trimethylxanthine (caffeine) were obtained and the lines assigned. Protonation-and N-Methylation parameters are derived by comparison of the 13C-chemical shifts of the protonated cations with those of the neutral molecules and also with those of the xanthine cation. The shifts are discussed in terms of variations in the shielding at the different C-atoms induced by N-methylation and protonation. Approximate correlations are found between the 13C-chemical shifts and the ^-electron densities at the C-atoms. 
  Reference    (Z. Naturforsch. 29c, 475—478 [1974]; received May 22/June 18 1974) 
  Published    1974 
  Keywords    13C-NMR, Xanthines, N-Methylation Shifts, Protonation Shifts 
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 TEI-XML for    default:Reihe_C/29/ZNC-1974-29c-0475.pdf 
 Identifier    ZNC-1974-29c-0475 
 Volume    29 
5Author    J. B. Stothers, A. Stoessl, E.W B WardRequires cookie*
 Abstract    The mechanism of the biological hydroxylation of the isopropenyl side-chain of the sesquiterpene capsidiol, to give 13-hydroxycapsidiol, has been investigated with 13C-N M R techniques, using capsidiol biogenetically enriched with 13C from [l^-^CU] acetate. The results indicate that neither an allylic rearrangement nor the formation of an epoxide intervene in the process. 
  Reference    Z. Naturforsch. 33c, 149—150 (1978); eingegangen am 30. Dezember 1977 
  Published    1978 
  Keywords    Biosynthesis, Capsidiol, 13C-NMR, Phytoalexins, Sesquiterpenes 
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 TEI-XML for    default:Reihe_C/33/ZNC-1978-33c-0149_n.pdf 
 Identifier    ZNC-1978-33c-0149_n 
 Volume    33 
6Author    RobleyJ. Light, Klaus HahlbrockRequires cookie*
 Title    Randomization of the Flavonoid A Ring during Biosynthesis of Kaempferol from |l,2 -,3C2j Acetate in Cell Suspension Cultures of Parsley  
 Abstract    Cell suspension cultures o f parsley (Petroselinum hortense) were incubated with [l,2-13C2]ace-tate during a period o f active flavonoid production. The flavonoid glycosides were extracted with ethanol, hydrolyzed in dilute acid, and the aglycones purified by chromatography. Apigenin, a flavone, and kaempferol, a flavonol, were analyzed at 67.9 MHz by 13C FT NMR. The 13C enrich­ ment confirmed that acetate contributes primarily to the flavonoid A ring. The coupling patterns between adjacent 13C atoms o f the A ring indicate that the cyclization direction of the A ring is random in both compounds. While randomization o f apigenin could have occurred chemically through opening of the pyrone ring under the acid conditions used for glycoside hydrolysis, ran­ domization o f the more stable flavonol must have occurred biosynthetically. The latter result supports the conclusion that a chalcone is an intermediate in flavonoid biosynthesis. 
  Reference    Z. Naturforsch. 35c, 717—721 (1980); received May 9 1980 
  Published    1980 
  Keywords    13C-NMR, Apigenin, Kaempferol, Flavonoid, Biosynthesis 
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 TEI-XML for    default:Reihe_C/35/ZNC-1980-35c-0717.pdf 
 Identifier    ZNC-1980-35c-0717 
 Volume    35 
7Author    PaulM. Dewick, M. Elanie, J. Steele, RichardA. Dixon, IanM W HiteheadRequires cookie*
 Title    Biosynthesis of Isoflavonoid Phytoalexins: Incorporation of Sodium |1,2-13C2] Acetate into Phaseollin and Kievitone  
 Abstract    13C-NMR analysis of the isoflavonoid phytoalexins phaseollin and kievitone produced by feeding sodium [l,2-13C2]acetate to wounded bean (Phaseolus vulgaris) cotyledons has demon­ strated the incorporation of intact acetate units into the aromatic A rings. Phaseollin shows a specific folding of the polyketide chain, whereas kievitone exhibits a randomisation of label in accordance with the intermediacy of a 2',4',6'-trihydroxylated chalcone during its formation. In neither case was sufficient label incorporated into analysis. 
  Reference    Z. Naturforsch. 37c, 363—368 (1982); received February 18 1982 
  Published    1982 
  Keywords    Biosynthesis, 13C-NMR, Phytoalexin, Phaseollin, Kievitone, Isoflavonoid 
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 TEI-XML for    default:Reihe_C/37/ZNC-1982-37c-0363.pdf 
 Identifier    ZNC-1982-37c-0363 
 Volume    37 
8Author    KennethR M Arkham, Christian Vilain, EckhardW. Ollenweber, VolkerH. Dietz, G.Erhard SchillingRequires cookie*
 Title    Isoceroptene, a Novel Polyphenol from Pityrogramma triangularis  
 Abstract    Isoceroptene, a polyphenol isolated in trace amount from the farinose frond exudate of Pityro­ gramma triangularis, is shown by spectroscopic means to possess the structure of one of the two possible "flavanone" isomers formed by ring closure of the "chalcone" ceroptene. The tautomeric structures best representing ceroptene and a related fined by 'H-NMR spectroscopy. In tro d u c tio n 
  Reference    Z. Naturforsch. 40c, 317 (1985); received November 14 1984 
  Published    1985 
  Keywords    Pityrogramma triangularis, Pteridaceae, Goldback Fern, Isoceroptene, 13C-NMR 
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 TEI-XML for    default:Reihe_C/40/ZNC-1985-40c-0317.pdf 
 Identifier    ZNC-1985-40c-0317 
 Volume    40 
9Author    Requires cookie*
 Title    Darstellung und Eigenschaften von Diacetylbis(methylimin)  
 Abstract    Synthesis and Properties of Biacetylbis(methylimine) H e i n d i r k to m D i e c k * , K l a u s -D i e t e r F r a n z * u n d W e r n e r M a j u n k e Biacetylbis(methylimine) (1) is obtained by formic acid catalyzed condensation of biacetyl and methylamine. Photoelectron-and UV spectra, H NMR and 13C NMR data are compared with those of the new compound biacetylbis(isopropylimine) (2) and glyoxalbis(isopropylimine) (3). 
  Reference    (Z. Naturforsch. 30b, 922—925 [1975]; eingegangen am 7. Mai 1975) 
  Published    1975 
  Keywords    Diimines, PE Spectra, Photoelectron Spectra, UV Spectra, 13C NMR 
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 TEI-XML for    default:Reihe_B/30/ZNB-1975-30b-0922.pdf 
 Identifier    ZNB-1975-30b-0922 
 Volume    30 
10Author    JoachimE. Becker, Xner, Gerhard SchillingRequires cookie*
 Title    H ans  
 Abstract    A hitherto unknown chalkon (2'-hydroxy-4',6'-dimethoxy-chalkon-4-glucoside) of European m istletoe (V iscum albu m L.) has been isolated and identified. 
  Reference    Z. Naturforsch. 33c, 771—7 (1978); received June 19 1978 
  Published    1978 
  Keywords    Viscum album L, L oranthaceae, Flavonoids, Chalkon-Glucoside, 13C-NMR 
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 TEI-XML for    default:Reihe_C/33/ZNC-1978-33c-0771_n.pdf 
 Identifier    ZNC-1978-33c-0771_n 
 Volume    33 
11Author    C. P., R. S. Tu D, Wolfgang Baumann, Yuri Oprunenko, Harald GüntherRequires cookie*
 Abstract    y n a m ic B e h a v io u r o f T e tra m e th y le th y le n e D ia m in e (T M E D A) L ig a n d s in S o lid O r g a n o lith iu m C o m p o u n d s : A V a r ia b le T e m p e r a tu r e 13C a n d 15N Dedicated to Professor Dr. W . Müller-Warmuth on the occasion of his 65th birthday The dynamic behaviour of tetramethylethylene diamine (TMEDA) ligands in three organometallic complexes, dimeric phenyllithium, [Li(tmeda)/*-Ph]2 (1), lithium cyclopentadienide, [Li(tmeda)]C5H5 (2), and dilithium naphthalendiide, trans-[Li(tmeda)]2C10H8 (3), has been studied by CP/MAS 13C and 15N as well as 7Li MAS NMR spectroscopy of powdered samples. Two dynamic processes with free activation enthalpies of 40 and 68 kJ mol-1, respectively, were detected for 1. The first one can be assigned to ring inversion of the five-membered Li-TMEDA rings, while the second is caused by a complete rotation of the TMEDA ligands or a ring inversion of the central four-membered C-Li-C-Li metallacycle. Fast rotation of the ligands on the NMR time scale was found for 2, while 3 shows 180° ring flips of the Li-TMEDA groups, which are characterized by an energy barrier AG" (317) of 64 kJ mol-1. 
  Reference    Z. Naturforsch. 50a, 429—438 (1995); received November 8 1994 
  Published    1995 
  Keywords    CP/MAS NMR, 13C-NMR, 15N-NMR, 7Li NMR, dynamic processes, organometallics 
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 TEI-XML for    default:Reihe_A/50/ZNA-1995-50a-0429.pdf 
 Identifier    ZNA-1995-50a-0429 
 Volume    50 
12Author    K. H.Requires cookie*
 Title    NMR-Kopplungskonstanten in freien und komplexierten phosphororganischen Liganden NMR Coupling Constants in Free and Complexed Phosphororganic Ligands  
 Abstract    i l d e n b r a n d u n d H . D r e e s k a m p 
  Reference    (Z. Naturforsch. 28b, 226—128 [1973]; eingegangen am 18. Dezember 1972/16. Januar 1973) 
  Published    1973 
  Keywords    lH-, 13C-NMR, 1H-{13C}-INDOR, phosphororganic compounds, transitionmetal complexes, P-C-coupling constants 
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 TEI-XML for    default:Reihe_B/28/ZNB-1973-28b-0226_n.pdf 
 Identifier    ZNB-1973-28b-0226_n 
 Volume    28 
13Author    Requires cookie*
 Abstract    In previous communications1-4 substituent effects in the 1-arylisobenzpyrylium salt series were investigated. 13C NMR spectroscopy now made it possible to obtain quantitative data, which could be used for comparison of the electron distribution in 1 -arylnaphthalene (1), 1-arylisobenzpyrylium salt (la), N-methylisoquinolinium salt (lb) and 1-aryliso-quinoline (lc) derivatives. We hope that this set of data will be useful for the study of the differences in aromatic character in the various compounds and some insight into the interactions between the heterocyclic and the 1-aryl ring can also be obtained. 
  Reference    (Z. Naturforsch. 30b, 943—945 [1975]; received November 11 1974/September 3 1975) 
  Published    1975 
  Keywords    Isobenzpyrylium Salts, 13C NMR, 1-Arylnaphthalene Derivatives, Aza Analogues, Oxa Analogues 
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 TEI-XML for    default:Reihe_B/30/ZNB-1975-30b-0943.pdf 
 Identifier    ZNB-1975-30b-0943 
 Volume    30 
14Author    Eckhard SchlimmeRequires cookie*
 Title    Darstellung von (9-ß-D-Ribofuranosyl)-s-triazolo-[ 1,2a]-purin-6-on durch Cyclisierung von N-l-Aminoguanosin Preparation of (9-/3-D-Ribofuranosyl)-s-triazolo-[l,2a]-purine-6-one by Cyclization of N-l-Amino Guanosine  
  Reference    Z. Naturforsch. 33c, 326 (1978); eingegangen am 22. März 1978 
  Published    1978 
  Keywords    s-triazolo-[l, 2a]-purine-6-one, 13C-NMR, 'H-NMR, Cross Links 
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 TEI-XML for    default:Reihe_C/33/ZNC-1978-33c-0326.pdf 
 Identifier    ZNC-1978-33c-0326 
 Volume    33