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1Author    Bernd Wrackmeyer, HeidiE. Maisel, Max HerberholdRequires cookie*
 Title    N-Ferrocenyl Amines Bearing Boryl and Silyl Substituents at the Nitrogen Atom, Studied by 57Fe NMR Spectroscopy  
 Abstract    A series of ferrocene sandwich compounds such as N-ferrocenyl amine, F c-N H 2 (1), the N-silylated derivatives F c-N H -S iM e3 (2), F c 
  Reference    Z. Naturforsch. 56b, 1373—1375 (2001); received September 19 2001 
  Published    2001 
  Keywords    Ferrocenes, Aminosilanes, Aminoboranes 
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 TEI-XML for    default:Reihe_B/56/ZNB-2001-56b-1373_n.pdf 
 Identifier    ZNB-2001-56b-1373_n 
 Volume    56 
2Author    P. Jutzi, C. Batz, A. MutluayRequires cookie*
 Title    Eightfold Functionalization of the Octasilsesquioxane Core  
 Abstract    Eightfold functionalized octasilsesquioxanes (R8Si80 12) are synthesized using the hydro­ silylation method. D ifferent types of groups R, consisting of an (-0 -S i M e 2(CH 2)2) spacer unit and various terminal units (-C H 2(C2M e)B 1oH1o, -C 5H 3M eM n(CO)3, -S iM e2C5H 4FeC5H 5 , -S iM e2Cl, -SiM eC l2, -S i(O E t)3) have been introduced. The hydro­ silylation products have been characterized by 'H, 13C, 29Si NMR and infrared spectroscopy and elemental analysis. The redox properties of the ferrocenyl substituted compound have been studied by cyclovoltammetry. Results 
  Reference    Z. Naturforsch. 49b, 1689—1692 (1994); received May 17 1994 
  Published    1994 
  Keywords    Octasilsesquioxanes, Hydrosilylation, Siloxanes, Ferrocenes, Carboranes 
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 TEI-XML for    default:Reihe_B/49/ZNB-1994-49b-1689.pdf 
 Identifier    ZNB-1994-49b-1689 
 Volume    49 
3Author    Harald Hilbig, FrankH. KöhlerRequires cookie*
 Title    3.4-D ihydro-l, 2, 3, 4-tetramethyl- pentafulvalene and its Conversion to Ferrocenes  
 Abstract    Reaction of tetram ethylcyclopentenone and cyclopentadienyl anion gave the title pentafulva-lene derivative. Its deprotonation with sodium or potassium hydride proceeded selectively at one of the methyl groups. The resulting 3 , 4-dihydro-1.3.4-trimethyl(2-methylene)pentafulvalenide ion was converted to the corresponding ferrocene which was obtained as two diasteroisomers in the ratio of 1/1. 
  Reference    Z. Naturforsch. 55b, 1099—1101 (2000); received Septem ber 13 2000 
  Published    2000 
  Keywords    Fulvalenes, D eprotonation, Ferrocenes 
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 TEI-XML for    default:Reihe_B/55/ZNB-2000-55b-1099_n.pdf 
 Identifier    ZNB-2000-55b-1099_n 
 Volume    55 
4Author    Michael Wedler, W. Herbert, FrankT. Roesky, Edelmann, Ulrich BehrensRequires cookie*
 Title    (T-Ferrocenyl-Komplexe der frühen Übergangsmetalle — Synthese und Struktur a-Ferrocenyl Complexes of the Early Transition Metals — Synthesis and Structure  
 Abstract    Ferrocenyllithium, FcLi (1), reacts with (C 5 H 4 CH 3) 2 TiCl2, CpTiCl, and Cp*TiCl 3 to give the new (7-ferrocenyl complexes (C5H 4 CH 3) 2 TiFc 2 (2), CpTiFc, (3) and Cp*Ti(Fc) 2 Cl (4), respectively. Treatment of Cp*ZrCl 2 with FcLi yields the mono-substitution product Cp*Zr(Fc)Cl (5), which has been characterized by an X-ray structure analysis. Compound 5 crystallizes in the monoclinic space group P2,/c (a = 1622.3(6), b = 995.0(2), c = 1664.3(6) pm; ß = 94.78(3)°; Z = 4). Due to the sterically demanding pentamethylcyclopentadienyl ligands 5 contains a long zirconium-carbon bond (231.4(8) pm) and the Cp rings of the ferrocenyl substituent are tilted by 10.2°. The syntheses of CpZrFc., (6), Cp*HfFc 3 (7) and Cp : VFc 2 (8) are also described. 
  Reference    Z. Naturforsch. 43b, 1461—1467 (1988); eingegangen am 6. Mai 1988 
  Published    1988 
  Keywords    Ferrocene, Early Transition Metals, Crystal Structure 
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 TEI-XML for    default:Reihe_B/43/ZNB-1988-43b-1461.pdf 
 Identifier    ZNB-1988-43b-1461 
 Volume    43 
5Author    Petra Prokop, Rainer Richter, Lothar BeyerRequires cookie*
 Title    Zur Reaktion von 2,4-Dioxo-4-ferrocenyl-butansäureethylester mit primären aromatischen Aminen On the Reaction of Ethyl 2,4-Dioxo-4-ferrocenyl-butanoate with Primary Aromatic Amines  
 Abstract    Starting from ethyl 2,4-dioxo-4-ferrocenyl-butanoate (1) a series of new ferrocene derivatives has been prepared. While the reaction with o-phenylene diamine leads to two ferrocene-con­ taining heterocyclic compounds, 4-ferrocenyl-3//-l,5-benzodiazepine-2-carbonic acid ethyl ester (3) and 3-(2-ferrocenyl-2-oxo-ethylidene)-3,4-dihydro-l//-quinoxalin-2-one • H20 (4), reactions with m-and /?-phenylene diamine give both the mono-and disubstituted products 5 -8, respectively. The conversion of 4 by Lawesson's reagent results in 2-ferrocenvl-thieno[2,3-b]quinoxaline (9). The new compounds have been characterized by their 'H , 1 C NMR, and mass spectra. The molecular structures of 4-ferrocenyl-4-oxo-2-phenylamino-but-2-enoic acid ethyl ester 2, and of 4 and 9 have been determined by X-ray crystal structure analysis. 
  Reference    Z. Naturforsch. 54b, 849—857 (1999); eingegangen am 12. März 1999 
  Published    1999 
  Keywords    Ferrocene, /3-Diketones, Enaminoketones, NMR Data, Crystal Structure 
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 TEI-XML for    default:Reihe_B/54/ZNB-1999-54b-0849.pdf 
 Identifier    ZNB-1999-54b-0849 
 Volume    54 
6Author    Herwig Schottenberger, Michael Buchmeiser, Johann Polin, K. Arl-, Eberhard SchwarzhansRequires cookie*
 Title    Ferrocen-Derivate der Quadrat-und Propiolsäure. Synthesen und Reaktionen Ferrocene Derivatives of Squaric Acid and Propiolic Acid. Syntheses and Reactions  
 Abstract    Concepts for linking ferrocene derivatives with conjugated squarate and propiolate based spacer systems have been investigated. Coupling o f 3,4-dichlorocyclobut-3-ene-l,2-dione (squaric acid dichloride) with cuproferrocene • dim ethylsulfide resulted in 3-chloro-4-ferrocenylcyclobut-3-ene-l,2-dione (ferrocenylsemisquaric acid chloride) and 3,4-diferro-cenylcyclobut-3-ene-l,2-dione. Ferrocenylsemisquaric acid chloride was further treated with ethynylferrocene and 4-ethynyl-4-(ferrocenylethynyl)tolan, respectively, to form the corre­ sponding mixed squaric diketones, which required Zn/Pd mediated coupling conditions for sufficient conversion. The symmetrically substituted derivative o f ferrocenylacetylene was pre­ pared by the same method. Cupration and subsequent coupling o f dilithioferrocene with one equivalent o f iodopro-piolic acid methyl ester yielded l'-iodo-l-ferrocenylpropiolic acid methyl ester, and with two equivalents l,16-bis(m ethoxycarbonylethynyl)biferrocene. N ucleophilic addition o f secondary amines to ferrocenylpropiolic acid ethyl ester gave aminoacrylates as intermediates, which rap­ idly converted to ketoesters during workup. Only in the case o f morpholine the corresponding adduct (ferrocenylmorpholino acrylate) could be isolated. l,3-Diferrocenylprop-2-ene-J-one has been obtained in a Benary reaction o f lithioferrocene with 3-diethylam inoethyl acrylate in quantitative yield. In order to provide alternative syntheses o f already known com pounds the substitution be­ havior o f different metallated ferrocene intermediates has also been evaluated by reaction with other acid halides (oxalyl chloride, thiophosgene, ethyl chloroformate). All new com pounds, 3-chloro-4-ferrocenylcyclobut-3-ene-l,2-dione (1); 
  Reference    Z. Naturforsch. 48b, 1524—1532 (1993); eingegangen am 8. Juli 1993 
  Published    1993 
  Keywords    Ferrocenes, Alkynes, Squaric Acid Derivatives, Propiolic and Acrylic Esters 
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 TEI-XML for    default:Reihe_B/48/ZNB-1993-48b-1524.pdf 
 Identifier    ZNB-1993-48b-1524 
 Volume    48 
7Author    B. Ernd, W. Rackm Eyer, D. Örfler, W. Olfgang Milius, M. Ax, H. ErberholdRequires cookie*
 Title    ,1-Organoboration of Trimethyl-l-propynyltin Using Diorganoboryl-Substituted Ferrocenes  
 Abstract    The reactions of various diorganoborylferrocenes, F c -B R 2 [1, R = Me (a), Et (b), 'Pr (c), 'Bu (d), Ph (f), R2B = 9-borabicyclo[3.3.1]nonyl (e)] and 1,1 '-bis(9-borabicyclo[3.3.1]nonyl)-ferrocene (2) with trimethyl-l-propynyltin (3) were studied, and the products of the 1,1-organoboration were characterized as the alkenyltin compounds 4 -6 by 'H, UB, 13C and 119Sn NMR. In the cases of l a -I d and If, there is competition between the transfer of a ferrocenyl group and the other organyl groups R from boron to carbon, whereas in the case of the 9-borabicyclo[3.3.1]nonane derivatives le and 2, the enlargement of the bicyclic system takes place selectively (compounds 4e and 6). The molecular structure of the product 6, obtained from the reaction between the l,l'-diborylated ferrocene 2 and two equivalents of 3, was determined by single crystal X-ray analysis (space group P2x!c\ monoclinic; Z = 4, a = 958.3(2), b = 1610.4(3), c = 2405.3(5) pm and ß = 90.33(3)°). 
  Reference    Z. Naturforsch. 51b, 851 (1996); received October 26. 1995 
  Published    1996 
  Keywords    Ferrocenes, Trimethyl-l-propynyltin, 1, 1-Organoboration, Alkenyltin Compounds, X-Ray 
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 TEI-XML for    default:Reihe_B/51/ZNB-1996-51b-0851.pdf 
 Identifier    ZNB-1996-51b-0851 
 Volume    51 
8Author    M. Ax Herberhold, U. Do Steffl, BerndW. RackmeyerRequires cookie*
 Title    l,3-Distanna-2-phospha-[3]ferrocenophanes -Synthesis, Reactivity and NMR Spectroscopic Properties  
 Abstract    -organo(R)-l,3-distanna-2-phospha-[3]ferrocenophanes [R = Me (2a), rBu (2b), CöH i i (2c), Ph (2d)] and one arsa-analogue 2d(As) were obtained from the reaction of l,l'-bis(chlorodim ethylstannyl)ferrocene 1 with either bis(trimethylsilyl)methylphosphane or the dilithio derivatives, Li2PR and Li^AsPh, respectively. All compounds 2 react with chalco-gens (oxygen, sulfur, selenium) by cleavage of the Sn-P bonds and formation of the known l,3-distanna-2-chalcogena-[3]ferrocenophanes. In contrast, 2d traps pentacarbonylmetal frag­ ments [M(CO)5] to give the stable phosphane complexes [M = Cr (4d), Mo (5d), W (6d)]. The l,l'-bis(diorganophosphanostannyl)ferrocenes [R = fBu (3b), Ph (3d)] were prepared for comparison of NMR data. The ferrocenophanes 2 are fluxional with respect to fast movement of the cyclopentadienyl rings which induces inversion at the pyramidal phosphorus atom. This dynamic process is slow in the cases of 2d(As) and of the pentacarbonyl complexes 4d -6d. All new compounds were characterised by 'H , i3C, 31P and 1 l9Sn NMR spectroscopy. Various 2D heteronuclear shift correlations {e.g. 11P /1H and ll9Sn/'H) were carried out for the com ­ pounds 2 and also for non-cyclic derivatives such as bis(trimethylstannyl)phenvlphosphane and -arsane in order to determine absolute signs of coupling constants [e.g. 7(n S n,''P) > 0 and 2J(] l9Sn,' l7Sn) < 0]. The NM R data suggest that the molecular frameworks of the ferroceno­ phanes 2 are not particularly strained. 
  Reference    (Z. Naturforsch. 54b, 57—62 [1999]; received July 28 1998) 
  Published    1999 
  Keywords    Ferrocene, Tin, Phosphorus, NMR Data, Coupling Signs l, l, 3, 3-Tetramethyl-2 
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 TEI-XML for    default:Reihe_B/54/ZNB-1999-54b-0057.pdf 
 Identifier    ZNB-1999-54b-0057 
 Volume    54