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1Author    Norbert Kuhn, Joanna Fahl, Riad Fawzi, Cäcilia Maichle-Mößmer, Manfred SteimannRequires cookie*
 Title    Stable Carbene Adducts of Chlorine [1]  
 Abstract    The carbene adducts 3a-c (R 1 = Me, Et, iso-Pr; R2 = Me) are formed from the 2,3-dihydro-imidazol-2-ylidenes la-c and 1,2-dichloroethane as air-sensitive solids in good yields. The compounds exhibit a reactive Cl-Cl bond. Benzene is chlorinated by 3a,b to give chlorobenzene and the imidazolium salts 10a,b under mild conditions. 3c acts as a chloride donor to give with AICI3 and S 0 2 the 2-chloroimidazolium salts 12c andl3c (X = A1C14, S 0 2C1). On hydrolysis, the less reactive hydrate salt 14c is formed from 3c. The X-ray structures of 10a and 14c are reported. 
  Reference    Z. Naturforsch. 53b, 720—726 (1998); eingegangen am 23. Februar 1998 
  Published    1998 
  Keywords    Carbene, Chlorine, X-Ray Data 
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 TEI-XML for    default:Reihe_B/53/ZNB-1998-53b-0720.pdf 
 Identifier    ZNB-1998-53b-0720 
 Volume    53 
2Author    Henri Brunner1, ManfredM. Uschiol3, Thomas Neuhierl3, Bernhard NuberbRequires cookie*
 Title    Copper Complexes with the Ligand [Cp2MoH2]  
 Abstract    The reaction of CuCl with [CP2M0H2] yields the complex [Cu(Cp2M oH2)2Cl]. An X-ray structure analysis shows that the coordination of the copper(I) ion by two [CP2M0H2] lig­ ands and the chloride ion is pseudo-trigonal planar. The hydride ligands were located by using difference Fourier methods. A manifold of reactions took place when an aqueous so­ lution of CUSO4 was treated with a solution of [Cp2M oH 2] in dichloromethane in a 1:2 molar ratio. The X-ray structure analysis established a polymeric structure of the complex [Cu(Cp2MoH2)2Cu(Cp2M oH2)S0 4 ]" with two different copper centers. 
  Reference    Z. Naturforsch. 54b, 337—340 (1999); received September 25 1998 
  Published    1999 
  Keywords    Copper, Molybdenum, X-Ray Data 
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 TEI-XML for    default:Reihe_B/54/ZNB-1999-54b-0337.pdf 
 Identifier    ZNB-1999-54b-0337 
 Volume    54 
3Author    R. En, C. Su, PetraD. Örrb, M. Artin, K. Ühnb, ClausK. Rieger0, M. Ikhael, Y. A. Ntip In DRequires cookie*
 Title    Chiral Pool Synthesis of 4a-Substituted Carbocyclic Cyclopentanoid Nucleoside Precursors, I  
 Abstract    A suitable protected D-ribono-1,4-lactone derivative has been used for the straightforward chiral pool synthesis of cyclopentanoid nucleoside precursors. Thus, epoxidation followed by deoxygenation or regioselective ring opening led to nucleoside precursors modified at the positions C(4), C(4a) and C(4,4a) as well as side-chain modified derivatives. The structures of the key intermediates were determined by X-ray analyses. 
  Reference    Z. Naturforsch. 54b, 1068—1078 (1999); received May 21 1999 
  Published    1999 
  Keywords    Nucleosides, Carbohydrates, X-Ray Data 
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 TEI-XML for    default:Reihe_B/54/ZNB-1999-54b-1068.pdf 
 Identifier    ZNB-1999-54b-1068 
 Volume    54 
4Author    Z. NaturforschRequires cookie*
 Title    Chiral Pool Synthesis of 4a-Substituted Carbocyclic Cyclopentanoid Nucleoside Precursors, II  
 Abstract    Suitable protected 4,4a-anhydro-cyclopentane derivatives have been used for the straight­ forward of cyclopentanoid nucleoside precursors. Thus, by simple transformations nucleoside precursors modified at the positions C(4), C(4a) and C(4,4a) as well as side-chain modified derivatives were accessible. The structures of the key intermediates were determined by x-ray analyses. 
  Reference    Z. Naturforsch. 54b, 1079—1091 (1999); received May 27 1999 
  Published    1999 
  Keywords    Nucleosides, Carbohydrates, X-Ray Data 
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 TEI-XML for    default:Reihe_B/54/ZNB-1999-54b-1079.pdf 
 Identifier    ZNB-1999-54b-1079 
 Volume    54 
5Author    Carsten Handrosch, FrankW. Heinemann, Horst KischRequires cookie*
 Title    Serendipitous Formation of the Cyclic Sulfite DIMTH(S0 3 ) by Reaction of DIMTH(OH)2 with SOCl2  
 Abstract    The reaction of the acetonide protected derivative of tartaric acid, D IM TH(OH)2 (1) (1,6-di-desoxy-3,4-0-isopropylidene-2,5-di-C-methyl-threo-hexitol), with SO C h/N E tj does not lead to the expected dichlorinated species 2, but affords the cyclic sulfite DIM TH(SÜ 3) (3) ((1R , 7/?)-9,9-dimethyl-4-oxide-2,2,6,6-tetramethyl-4-thia-3,5,8,10-tetraoxabicyclo-[5,3,0] de­ cane) as indicated by X-ray structural analysis. 
  Reference    Z. Naturforsch. 54b, 1015—1018 (1999); received April 16 1999 
  Published    1999 
  Keywords    Cyclic Sulfite, X-Ray Data, Tartaric Acid 
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 TEI-XML for    default:Reihe_B/54/ZNB-1999-54b-1015.pdf 
 Identifier    ZNB-1999-54b-1015 
 Volume    54 
6Author    Norbert Kuhn, Elke Niquet, Manfred Steimann, Isabel WalkerRequires cookie*
 Title    Methoxyalky 1-funktionalisierte 2,3-Dihy droimidazol-2-ylidene [ 1 ] Methoxyalkyl Functionalized 2,3-Dihydroimidazol-2-ylidenes [1]  
 Abstract    The 2,3-dihydro-l,3-di(methoxyalkyl)imidazol-2-ylidenes are obtained from the correspon­ ding cyclic thioureas and potassium. With CS2, the imidazolium dithiocarboxylates are formed. The results of X-ray structure determinations of two of these products are reported. 
  Reference    Z. Naturforsch. 54b, 1181—1187 (1999); eingegangen am 8. Juni 1999 
  Published    1999 
  Keywords    Carbenes, Imidazoles, Dithiocarboxylates, X-Ray Data 
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 TEI-XML for    default:Reihe_B/54/ZNB-1999-54b-1181.pdf 
 Identifier    ZNB-1999-54b-1181 
 Volume    54 
7Author    KaterynaE. Gubina3, VladimirA. Ovchynnikova, VladimirM. Amirkhanov3, Tatyana Yu, ViktorV. Sliva3, Tadeusz Skopenko3, Henryk Glowiakb, KozlowskibRequires cookie*
 Title    Carbacylamidophosphates: Structure and Properties of Bis(N,N,-morpholido)-[(N"-morpholido)-carboxamido] phosphate  
 Abstract    The bis(N,N'-morpholido)-[(N"-morpholido)-carboxamido] phosphate: 0 (CH2 CH2)NC(0)-N(H)P(0)[N (CH 2 CH 2)0 ] 2 [HL], has been prepared and characterized by means of IR, 31P and 'H NM R spectroscopy and X-ray diffraction (triclinic, a = 9.282(2), b = 9.308(2), c = 21.341(4) Ä, a = 80.79(3)°, ß = 80.92(3)° 7 = 66.92(3)°, V = 1665.1(6) Ä 3, space group P i, Z = 4 and R = 0.0423, wR2 = 0.1303 for 6774 unique reflections used). The unit cell consists of two independent molecules connected by hydrogen bonds N-H...O=P into non-symmetric dimers. The compound behaves as a HL molecule with a protonation constant corresponding to the -C (0)N (H)P (0)-group of pK = 8.65 as determined by potentiometric studies. 
  Reference    Z. Naturforsch. 54b, 1357—1359 (1999); received March 29 1999 
  Published    1999 
  Keywords    Carbacylamidophosphates, X-Ray Data, NMR Data 
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 TEI-XML for    default:Reihe_B/54/ZNB-1999-54b-1357.pdf 
 Identifier    ZNB-1999-54b-1357 
 Volume    54 
8Author    BirteA. Hrens, PeterG. Jones, Sonderdruckanforderungen An, ProfP G Dr, Jo­Requires cookie*
 Title    P olysulfonylam ine, C X X II  
 Abstract    [1] N ich t-kon ven tion elle W asserstoff­ brücken in B is[diphenylphosphino-(diphenylphosphinselenid)m ethan]-gold(I)-di(m ethansulfonyl)am id Polysulfonylamines, CXXII. Non-Conventional Hydrogen Bonds in Bis[diphenylphosphino(diphenylphos-phinselenide)methane]gold(I) Di(methanesulfonyl)amide In the crystal structure of (dppmSe)2Au+ N (S 0 2C H 3)2-(dppm = Ph2PCH2PPh2) chains are formed from non-conventional hydrogen bonds of the type C -H --0 . Within these chains two bi­ furcated hydrogen bond systems are present, each involving one methylene hydrogen (H ---0 2.51, 2.65 A) and one phenyl hydrogen (H — O 2.31, 2.35 A) as donors. 
  Reference    Z. Naturforsch. 54b, 1474—1477 (1999); eingegangen am 16. Juli 1999 
  Published    1999 
  Keywords    Gold(I), Hydrogen Bonds, X-Ray Data 
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 TEI-XML for    default:Reihe_B/54/ZNB-1999-54b-1474_n.pdf 
 Identifier    ZNB-1999-54b-1474_n 
 Volume    54 
9Author    EvgeniV. Avtomonov, KonstantinA. RufanovRequires cookie*
 Title    Zirconium Reagents for Organometallic Synthesis. Crystal Structures of ZrCl4*2Et20 and (Et2N)ZrCl3*Et20  
 Abstract    Reaction of 3 equivalents of ZrCU-2Et20 (1) with 1 equivalent of (Et^N ^Zr in diethyl ether readily affords crystalline (Et2N)ZrCl3-2Et20 (2) in almost quantitative yield. The product was characterised by elemental analysis and by 1H. 1 C NMR, and MS techniques. The reactivity of this reagent towards C-H acidic compounds has been studied using cyclopentadiene as a C-H acid. The crystal structures of both 1 and 2 have been determined by X-ray diffractometry. The coordination polyhedra reveal a nearly perfect octahedral geometry with a trans Et20 ligation for 1 and a cis one for 2. 
  Reference    Z. Naturforsch. 54b, 1563—1567 (1999); received July 7 1999 
  Published    1999 
  Keywords    Zirconium, Adducts, Amides, Organometallic Reagents, X-Ray Data 
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 TEI-XML for    default:Reihe_B/54/ZNB-1999-54b-1563.pdf 
 Identifier    ZNB-1999-54b-1563 
 Volume    54 
10Author    M. Atthias, W. Esterhausen, Tobias Bollw, Kurt PolbornRequires cookie*
 Title    Synthese, Struktur und Reaktivität von Aminomethylpyridin- zinkdihalogeniden Synthesis, Structure and R eactivity o f A m inom ethylpyridine Zinc D ihalides  
 Abstract    Zinc dichloride reacts with aminomethylpyridine (AMP) to the corresponding 1:1 adduct 1, whereas ZnBr2 forms an ionic 1:2 complex of the type [(AMP)2ZnBr]+ Br~ 2, which loses one neutral coligand upon heating in M e-C (0)0E t to yield nearly insoluble (AM P)ZnBr2 3. The condensation reaction of these compounds with acetone yields propylideneaminomethylpyri-dine zinc dichloride (4) and dibromide (5), respectively. The reaction of Z nl2 with AMP and acetone gives propylideneaminomethylpyridine zinc dichloride (6) in quantitative yield. The structures of 3, 4, and 6 confirm the linear relationship between the Zn-N distance and the X-Zn-X angle in compounds of the type (L2)ZnX2 with L2 being a bidentate amino base, whereas short Zn-N bonds enforce small X-Zn-X angles. Compound 2 consists of separated ions in the solid state with a five coordinate zinc atom in a distorted trigonal bipyramidal coordination sphere. 
  Reference    (Z. Naturforsch. 55b, 51—59 [2000]; eingegangen am 9. November 1999) 
  Published    2000 
  Keywords    Halide, Pyridine Complexes, Zinc, X-Ray Data 
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 TEI-XML for    default:Reihe_B/55/ZNB-2000-55b-0051.pdf 
 Identifier    ZNB-2000-55b-0051 
 Volume    55 
11Author    Peter Machnitzkia, Othmar Stelzer, Claudia LandgrafebRequires cookie*
 Title    Coordination Chemistry and Ligand Properties o f Chloromethylchlorophosphines R(C1)P-CH2-C1 -Molecular Structure o f m m s-C l2Pd[/Bu(Cl)P-CH2-Cl]2  
  Reference    Z. Naturforsch. 52b, 1103—1113 (1997); eingegangen am 6. Mai 1997 
  Published    1997 
  Keywords    cis-, trans-Isomers, X-Ray Data 
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 TEI-XML for    default:Reihe_B/52/ZNB-1997-52b-1103.pdf 
 Identifier    ZNB-1997-52b-1103 
 Volume    52 
12Author    SvetlanaN. Nikolaeva3, EvgeniV. Avtomonov, Jörg Lorberthb, ValeryS. Petrosyan3Requires cookie*
 Title    The Reaction of Bis[bis(trimethylsilyl)amino]germylene with Bromocyanogen and the Crystal Structure of Bis[bis(trimethylsilyl)amino]bromocyanogermane  
 Abstract    Bis[bis(trimethylsilyl)amino)]germylene (1) reacts with bromocyanogen to give bis[bis(trimethylsilyl)amino]bromocyanogermane (2). 2 crystallises from petroleum ether as a colourless solid which has been characterised by IR, H,I3C, 29Si NMR spectroscopy, ele­ mental analysis and X-ray diffractometry. 
  Reference    (Z. Naturforsch. 53b, 9—12 [1998]; received October 7 1997) 
  Published    1998 
  Keywords    Germanium, Germylene, Germyl Cyanide, X-Ray Data 
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 TEI-XML for    default:Reihe_B/53/ZNB-1998-53b-0009.pdf 
 Identifier    ZNB-1998-53b-0009 
 Volume    53 
13Author    Carola Stoll, Ingo-Peter Lorenz, Heinrich Nöth, Thomas SeifertRequires cookie*
 Title    Oxochlorierung von Ubergangsmetall-Komplexen mit Thionylchlorid Oxochlorination of Transition Metal Complexes with Thionyl Chloride  
 Abstract    The reaction of the transition metal complexes CpV(CO)4 and [CpM o(CO)3]2 with thionyl chloride affords the oxodichlorides C pM (0)C l2 (M = V, Mo) by oxidative decarbonylation. The X-ray structure analysis of C pV (0)C l2 shows the pseudo tetrahedral "piano-stool" configuration for the central vanadium atom. E in le itu n g 
  Reference    Z. Naturforsch. 53b, 153—156 (1998); eingegangen am 25. November 1997 
  Published    1998 
  Keywords    Thionyl Chloride, Oxochlorination, Metaloxodichloride, X-Ray Data 
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 TEI-XML for    default:Reihe_B/53/ZNB-1998-53b-0153.pdf 
 Identifier    ZNB-1998-53b-0153 
 Volume    53 
14Author    VladimirA. Ovchynnikov3, VladimirM. Amirkhanov3 ', TarasP. Timoshenko3, Tadeusz Glowiakb, Henryk KozlowskibRequires cookie*
 Title    Carbacylamidophosphates: Synthesis, Properties, and Structure of Dimorfolido-N-trichloroacetylphosphorylamide  
 Abstract    Dimorpholido-N-trichloroacetylphosphorylamide: CCl3C(0)NHP(0)[N(CH2CH2)2 0 ] 2 [HL] and its sodium [NaL] and morpholine [HN(CH2CH2) 2 0 HL] salts were synthesized for the first time. The compounds were studied by IR spectroscopy and assignments of the characteristic IR bands have been made. The structure of [HL] was determined by X-ray diffraction. Crystals are monoclinic, a = 11.412(2) A, b = 16.056(3) A, c = 9.622(2) Ä, ß = 108.55(3)°, space group P2i/c; Z = 4. The refinement of the structure converged at R = 0.066. The molecules are connected into centrosymmetric dimers via hydrogen bonds formed by the phosphorylic oxygen atoms and hydrogen atoms of amide groups. 
  Reference    Z. Naturforsch. 53b, 481—484 (1998); received November 11 1997 
  Published    1998 
  Keywords    Carbacylamidophosphates, IR Data, X-Ray Data 
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 TEI-XML for    default:Reihe_B/53/ZNB-1998-53b-0481.pdf 
 Identifier    ZNB-1998-53b-0481 
 Volume    53 
15Author    PeterG. Jones, Birte AhrensRequires cookie*
 Title    Gold(I)-Komplexe mit Aminliganden, II [1]. (Methylpyridin)-Komplexe von Gold(I) Gold(I) Complexes with Amine Ligands, II. Methylpyridine Complexes of Gold(I)  
 Abstract    Gold(I) complexes of overall formula LAuCl (L = various methylpyridines) are non-con­ ducting in acetone. X-ray structure analyses show that the solid state structure of the cor­ responding complex 1 (L = 2-picoline) is molecular; the 3-picoline derivative 2 is however ionic (L2A u)+(AuCl2)-. 3-Picoline forms a molecular complex LAuC6F5 (3) and also the ionic (L2Au)+(SbF6)_ (4). Complexes 1, 2 and 4 display short A u--A u contacts, leading to chains of gold atoms; additionally, complexes 3 and 4 show weak Au-F contacts. The (3-picoline)-gold(III) complex /rans-(L2AuCl2)+(SbF6)_ (5) was obtained as a by-product; it too contains short Au-F contacts. 
  Reference    Z. Naturforsch. 53b, 653—662 (1998); eingegangen am 6. April 1998 
  Published    1998 
  Keywords    Gold(l), Pyridine, Amine Complexes, X-Ray Data 
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 TEI-XML for    default:Reihe_B/53/ZNB-1998-53b-0653.pdf 
 Identifier    ZNB-1998-53b-0653 
 Volume    53 
16Author    V. Erena, M.T T Hiede, W. Olfgang, JeitschkoRequires cookie*
 Title    Ternary Intermetallic Compounds L«Mn2Ali0 (Ln = Y, La-Nd, Sm, Gd-Dy) and L«Re2Al10 (Ln = Ce, Pr, Sm) with CaCr2Al10-Type Structure  
 Abstract    The twelve title compounds have been prepared for the first time. Their CaCnA lio-type structure (PA/nm m, Z = 4) was refined from single-crystal X-ray data for the three representatives TbM mAlio (a = 1274.3(2) pm, c = 511.4(2) pm, R = 0.025 for 680 structure factors F and 43 variable parameters VO, CeRe2Alio (a -1295.5(5) pm, c -517.2(4) pm, R = 0.054 for 810 F a n d 46 V), and SmReaAlio (a = 1291.5(2) pm, c = 516.5(1) pm, R = 0.021 for 622 F and 46 V). The atomic positions of the lanthanoid and transition metal atoms are fully occupied. Significant deviations from the full occupancies were observed for two aluminum sites in TbM mAlio and for all five aluminum sites of the two rhenium-containing compounds, resulting in the compositions TbMn2Al9.63(2), CeRe2Al9.52(8), and SmRe2Al9.i6< 9)-The cell volume of CeRe2Alio and to a smaller extent also that of CeMm A1 io indicate mixed or intermediate +III/+IV valencies of the cerium atoms in these compounds. The structural relationships between the three closely related body-centered tetragonal structures of ThM ni2, CeMn-iAlx, DyFeöAU, and the primitive tetragonal structure of CaCnA lio are briefly discussed. 
  Reference    Z. Naturforsch. 53b, 673—678 (1998); received February 2 1998 
  Published    1998 
  Keywords    Intermetallic Compounds, Crystal Structure, X-Ray Data 
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 TEI-XML for    default:Reihe_B/53/ZNB-1998-53b-0673.pdf 
 Identifier    ZNB-1998-53b-0673 
 Volume    53 
17Author    VladimirA. Ovchynnikov3, VladimirM. Amirkhanov3, AnatoliyA. Kapshuka, Tatyana Yu, Tadeusz Sliva2, Henryk Glowiakb, KozlowskibRequires cookie*
 Title    Synthesis, IR and X-Ray Studies of Tetra(N,N'-tetraethyl-N"-benzoyl- phosphorictriamide)-tetra(/x-3-methoxo)-tetra(methanol)tetra-NickeI(II)  
 Abstract    A new nickel(II) complex with N,N'-tetraethyl-N"-benzoylphosphortriamide (HL = C6H5C(0)N(H)P(0)(NEt2)2) of composition Ni4L4(OCH3)4-(HOCH;04 (1) has been synthe­ sized. The crystal and molecular structure of 1 has been determined from the X-Ray diffraction data (tetragonal, space group P42)C with a = 17.000(2) A, c = 15.338(3) A, Z = 2; R = 0.0399 for 1412 unique reflections). The structure is made up of cubane-like tetramers. In the corners of a cube there are 4 atoms of nickel and 4 atoms of oxygen of methoxy groups. The nickel atoms are characterized by a slightly distorted octahedral environment, which consists of three oxygen atoms of methoxy groups, carbonylic and phosphorylic oxygen atoms of the ligand L~, and an oxygen atom of a methanol molecule. The ligands L~ coordinate to the metal ion forming a chelate via the oxygen atoms of carbonylic and phosphorylic groups. 
  Reference    Z. Naturforsch. 53b, 836—840 (1998); received February 23 1998 
  Published    1998 
  Keywords    Nickel (II), Carbacylamidophosphates, X-Ray Data 
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 TEI-XML for    default:Reihe_B/53/ZNB-1998-53b-0836.pdf 
 Identifier    ZNB-1998-53b-0836 
 Volume    53 
18Author    Norbert Kuhn, Martin Grathwohl3, Manfred Steimann3, Gerald Henkelb, HerrnRequires cookie*
 Title    .2-Bis( 1' ,31 -dimethy limidazolin-21 -iminato)ethan - ein neuer Chelatligand [1]  
 Abstract    The reaction of 2-imino-l,3-dimethylimidazoline (10, ImNH) with X-CH2CH2-X (11, X = p-CH3C6 H4 S 0 3) gives the diimine adduct ImN-CH2CH2-NIm • 2 HX (12) from which the diimine ImN-CH2CH2-NIm (13) is obtained on treatment with KH. 13 reacts with (C6H5CN)2PdCl2 (15) to give the chelate complex (ImN-CH2CH2-NIm)PdCl2 (16). The X-ray structures of 12 and 16 are reported. 
  Reference    Z. Naturforsch. 53b, 997—1003 (1998); eingegangen am 2. Juni 1998 
  Published    1998 
  Keywords    Imines, Palladium, Chelates, Ligand Effects, X-Ray Data 
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 TEI-XML for    default:Reihe_B/53/ZNB-1998-53b-0997.pdf 
 Identifier    ZNB-1998-53b-0997 
 Volume    53 
19Author    N. Orbert, K. Uhn, M. Anfred, Steim Ann, Gerd Weyers, HerrnRequires cookie*
 Title    Synthese und Eigenschaften von l,3-Diisopropyl-4,5-dimethylimidazolium- 2-car boxy lat. Ein stabiles Carben-Addukt des Kohlendioxids [1]  
 Abstract    The reaction of 2,3-dihydro-l,3-diisopropyl-4,5-dimethylimidazol-2-ylidene (5) with C 0 2 gives the imidazolium-2-carboxylate 6 . The compound can be transformed into the salts of its corresponding Broenstedt acid 8 . The cationic acid chloride 10a is obtained from 6 and thionyl chloride. Chemical properties and spectroscopic data indicate 6 to be less basic than its anionic counterparts, e. g. PhC02 . The X-ray structure of 
  Reference    Z. Naturforsch. 54b, 427—433 (1999); eingegangen am 27. November 1998 
  Published    1999 
  Keywords    Carbenes, Imidazoles, Carboxylic Acids, X-Ray Data 
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 TEI-XML for    default:Reihe_B/54/ZNB-1999-54b-0427.pdf 
 Identifier    ZNB-1999-54b-0427 
 Volume    54 
20Author    Norbert Kuhn, Manfred Steimann3, Gerd Weyers3, Gerald Henkelh, HerrnRequires cookie*
 Title    l,3-DHSopropyl-4,5-dimethylimidazolium-2-N,N'-diisopropylamidinat, ein neuartiges Retain [1] 1,3-Diisopropyl-4,5-dimethylimidazolium-2-N,N'-diisopropylamidinate, a Novel Betaine [1]  
 Abstract    The imidazolium-2-amidinate 6 is obtained from the reaction of 2,3-dihydro-1,3-diisopropyl-4,5-dimethylimidazol-2-ylidene (4) with diisopropylcarbodiimide (5) as stable solid. Overcrow­ ding causes a lowered symmetry of the amidinate fragment indicated both by structural and NMR data. The strongly basic properties of 6 allow facile protonation with HC1 to the cationic amidine derivatives 7 and 8 . The ketoamidine 10 is formed by a ring opening reaction of 6 with water. I he X-ray structures of 6 and 10 are reported 
  Reference    Z. Naturforsch. 54b, 434—440 (1999); eingegangen am 21. Dezember 1998 
  Published    1999 
  Keywords    Amidines, Carbenes, Carbon Diimides, Imidazoles, X-Ray Data 
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 TEI-XML for    default:Reihe_B/54/ZNB-1999-54b-0434.pdf 
 Identifier    ZNB-1999-54b-0434 
 Volume    54 
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