| 1 | Author
| Joseph Grobe, Due Le Van | Requires cookie* | | Title
| Reactive E=C (p-p)jr-Systems III [1]: Diels Alder Reactions with F 3 CP=CF 2 as Dienophile  | | | Abstract
| The perfluorophosphaalkene F 3 CP=CF 2 (1) reacts as a dienophile at temperatures between —20 and +15 °C with cyclopentadiene, 1,3-cyclohexadiene, butadiene and 2,3-dimethyl-butadiene, respectively, giving the corresponding Diels-Alder adducts 2 to 5 in high yields. The observed reactivity proves the close relationship of P=C and C=C systems. CF2 >F^ CF 2 | | |
Reference
| Z. Naturforsch. 40b, 467—469 (1985); eingegangen am 27. November 1984 | | |
Published
| 1985 | | |
Keywords
| Perfluorophosphaalkene, Diels-Alder Reactions, Mass Spectra, NMR Spectra | | |
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| default:Reihe_B/40/ZNB-1985-40b-0467.pdf | | | Identifier
| ZNB-1985-40b-0467 | | | Volume
| 40 | |
2 | Author
| Ekkehard Lindner, Fritz Zinßer, HermannAugust Mayer, Wolfgang Hiller, Riad Fawzi | Requires cookie* | | Title
| Darstellung und Eigenschaften von und Reaktionen mit metallhaltigen Heterocyclen, XLVII [1] Einschiebungsreaktionen von phasentransferkatalytisch in situ erzeugten Dihalocarbenen in P-haltige Manganacycloalkane — Struktur und chemisches Verhalten der Reaktionsprodukte Preparation and Properties of and Reactions with Metal-Containing Heterocycles, XLVII [1] Insertion Reactions of Phase-Transfer-Catalytically in situ Generated Dihalocarbenes into P-Containing Manganacycloalkanes — Structure and Chemical Behaviour of the Reaction Products  | | | Abstract
| The phase-transfer-catalytically in situ generated dihalocarbenes CC1 2 and CBr 2 are inserted into a ß-C—H bond of the five-and six-membered phosphamanganacycloalkanes (OC) 4 MnPPh 2 (CH 2)"CH 2 CH 2 (la, b) [n = 1(a), 2(b)] to give the functionalized metallacycles (OC) 4 MnPPh 2 (CH 2)"CH(CHX 2)CH 2 (2a, a', b, b') [X = Cl: n = l(a), 2(b); X = Br: n = l(a'), 2(b')]. 2b crystallizes in the orthorhombic space group Pbca with Z = 8 and has a distorted chair conformation with equatorial position of the CHC1 2 group. The envelope conformation of 2a in solution was elucidated by means of 'H and 13 C{'H} NMR spectroscopic investigations. | | |
Reference
| Z. Naturforsch. 40b, 615—623 (1985); eingegangen am 20. Dezember 1984 | | |
Published
| 1985 | | |
Keywords
| Dihalocarbene Insertion, Manganacycloalkanes, X-Ray, NMR Spectra | | |
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| default:Reihe_B/40/ZNB-1985-40b-0615.pdf | | | Identifier
| ZNB-1985-40b-0615 | | | Volume
| 40 | |
3 | Author
| Willy Gombler | Requires cookie* | | Title
| NMR-spektroskopische Untersuchungen an Chalkogenverbindungen, VI [1] S-Isotopeneffekte auf 19 F-NMR-Frequenzen und ihre Abhängigkeit von Bindungslängen NMR Spectroscopic Studies on Chalcogen Compounds, VI [1] l4 S Isotope Effects on 19 F NMR Frequencies and their Dependence on Bond Lengths  | | | Abstract
| Nineteen values for 34 S-induced isotope shifts on the NMR frequency of directly bonded fluorine of fourteen S(II), S(IV), and S(VI) compounds are reported. The dependence of these l A 19 F(34/32 S) values on the S —F bond length is demonstrated. Three reasons for this correlation are discussed. (1) A nonlinear dependence of nuclear shielding on bond distance. (2) Decreasing energy difference of two isotopomers with increasing bond distance. (3) Decreasing anharmonicity of the potential curve with increasing bond length. Some previously unknown S—F bond distances have been estimated by this correlation. The isotope shifts decrease with increasing temperature. This is attributed to vibrationally excited states in conjunction with a nonlinear dependence of nuclear shielding on bond distance. Furthermore, 34 S-induced isotope shifts on fluorine-19 over two bonds, 2 A 19 F(34/32 S), have been observed for the first time, and the 33 S-induced isotope effect in SF 6 has been measured. | | |
Reference
| Z. Naturforsch. 40b, 782—786 (1985); eingegangen am 6. Februar 1985 | | |
Published
| 1985 | | |
Keywords
| NMR Spectra, S-F Bond Length, Sulfur Fluorine Compounds | | |
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| default:Reihe_B/40/ZNB-1985-40b-0782.pdf | | | Identifier
| ZNB-1985-40b-0782 | | | Volume
| 40 | |
4 | Author
| KlausR. Pörschke, Richard Mynott, Klaus Angermund, ++, Carl Krüger | Requires cookie* | | Title
| Neue Bis(phosphan)-nickel(0)-alkin-Komplexe New Bis(phosphane)-nickel(0)-alkyne Complexes  | | | Abstract
| (Me 3 P)2Ni(C 2 H4) (5) and (dmpe) 2 Ni2(C 2 H4)3 (6) react with various alkynes including ethyne (acetylene) and 1-alkynes to form the crystalline compounds (Me 3 P) 2 Ni(C 2 RR'), (dmpe)Ni(C 2 RR'), and (dmpe)2Ni 2 (C 2 R2) 2 (R.R' = H, Me, Ph). Structural assignments were made on the basis of : H, I3 C, and 31 P NMR data. The crystal and molecular structure of (dmpe)Ni(C 2 Ph 2) (17) has been determined by X-ray crystallography. | | |
Reference
| Z. Naturforsch. 40b, 199—209 (1985); eingegangen am 15. Oktober 1984 | | |
Published
| 1985 | | |
Keywords
| Alkynes, Nickel(O), Phosphanes, NMR Spectra, X-Ray | | |
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| default:Reihe_B/40/ZNB-1985-40b-0199.pdf | | | Identifier
| ZNB-1985-40b-0199 | | | Volume
| 40 | |
7 | Author
| GerhardG. Habermehl, PeterE. Hammann | Requires cookie* | | Title
| Rearrangement of 14/3-Hydroxy-12ß-sulfoxy-steroids to 13,17-Seco-12,17-cyclo-steroids; a 2D-NMR Analysis  | | | Abstract
| The rearrangement of 3-oxo-14/3-hydroxy-12/3-methanesulfoxy-card-20(22)-enolide and 14/3-hydroxy-12/3-methanesulfoxy-pregnane-3,20-dione during elimination of the sulfoxygroups was studied. By means of 2D-NMR analysis the structures were determined as 13,17-seco-12,17-cyclo-steroids. | | |
Reference
| Z. Naturforsch. 40b, 656—660 (1985); received November 14 1984 | | |
Published
| 1985 | | |
Keywords
| 13, 17-Decyclo-12, 17-cyclosteroids, Steroid Rearrangement, NMR Spectra | | |
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| default:Reihe_B/40/ZNB-1985-40b-0656.pdf | | | Identifier
| ZNB-1985-40b-0656 | | | Volume
| 40 | |
8 | Author
| Udo Kunze, Andreas Bruns | Requires cookie* | | Title
| Phosphinsubstituierte Chelatliganden, XII [1] Metallinduzierte E/Z-Isomerisierung an Rheniumcarbonyl-Komplexen mit Phosphinothioformamid-und -thioformimidat-Liganden Phosphine-Substituted Chelate Ligands, XII [1] Metal-Induced E/Z-Isomerisation of Rheniumcarbonyl Complexes with Phosphino- thioformamide and -thioformimidate Ligands  | | | Abstract
| The coordination of tertiary phosphinothioform-amides and the isomeric S-alkyl phosphinothioform-imidates to BrRe(CO) 5 gives the /ac-bromotricar-bonylrhenium complexes la, b and 2a, b with P,S-chelate ligands. Unlike the analogous manganese complexes, the NMR spectra of dissolved lb and 2a, b show a splitting of the N-alkyl ('H, 13 C) and phosphorus signals indicating E/Z isomerisation of the ligands. | | |
Reference
| (Z. Naturforsch. 40b, 127—128 [1985]; eingegangen am 7. August/5. September 1984) | | |
Published
| 1985 | | |
Keywords
| E/Z-Isomerisation, NMR Spectra, Rhenium Complexes, Tertiary Phosphinothioform-amides, S-Alkyl Phosphinothioformimidates | | |
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| default:Reihe_B/40/ZNB-1985-40b-0127_n.pdf | | | Identifier
| ZNB-1985-40b-0127_n | | | Volume
| 40 | |
9 | Author
| Dieter Hellwinkel, Peter Ittemann, Siegbert Bohnet | Requires cookie* | | Title
| Dibenzo  | | | Abstract
| [b,g]heterocin-5,7-dione Dibenzo[b.g]heterocine-5,7-diones | | |
Reference
| Z. Naturforsch. 40b, 858—859 (1985); eingegangen am 13. Februar 1985 | | |
Published
| 1985 | | |
Keywords
| Dibenzo[b, g]heterocine-5, 7-diones, Synthesis, NMR Spectra, Stereochemistry, Ring Inversion | | |
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| default:Reihe_B/40/ZNB-1985-40b-0858_n.pdf | | | Identifier
| ZNB-1985-40b-0858_n | | | Volume
| 40 | |
10 | Author
| W. Erner, M. Artin, E. Bner, W. Erner Bertleff | Requires cookie* | | Title
| CS2, CSSe und CSe2 als Bausteine für ein-und zweikernige Palladium-und Platinkomplexe [1] CS2, CSSe and CSe2 as Building Blocks for Mono-and Binuclear Palladium and Platinum Complexes [1] H elm ut  | | |
Reference
| Z. Naturforsch. 40b, 1351 (1985); eingegangen am 11. Juni 1985 | | |
Published
| 1985 | | |
Keywords
| Mononuclear Phosphanepalladium Complexes, NMR Spectra, Binuclear Complexes, Bridging Heteroallenes C EE', Zwitterions PR3CEE' as Ligands | | |
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| default:Reihe_B/40/ZNB-1985-40b-1351.pdf | | | Identifier
| ZNB-1985-40b-1351 | | | Volume
| 40 | |
12 | Author
| Jacek Bielawski, Kurt Niedenzu, JeanS. Stewart | Requires cookie* | | Title
| Preparation and Characterization of Some Isoelectronic Boron-Nitrogen Analogs of Substituted Uracil [1]  | | | Abstract
| Several l,3,5-triaza-2-boracyclohexa-4,6-diones, which are isoelectronic analogs of substituted uracil, have been prepared by condensation reactions of boranes with biurets. They include species containing a NH or BH unit as potentially reactive sites. The latter are extremely sensitive to hydrolysis but are readily handled as the 2-methylaminoethanol derivative containing four-coordinate boron. | | |
Reference
| Z. Naturforsch. 40b, 389—392 (1985); received November 18 1984 | | |
Published
| 1985 | | |
Keywords
| Boron-Nitrogen Compounds, Azaborauracils, l, 3, 5-Triaza-2-boracyclohexa-4, 6-diones, Spiroboron Compound, NMR Spectra | | |
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| default:Reihe_B/40/ZNB-1985-40b-0389.pdf | | | Identifier
| ZNB-1985-40b-0389 | | | Volume
| 40 | |
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