bluuebunny/crossref_metadata_2025_split huggingface dataset:
Synthese und Struktur eines ungewöhnlichen Molybdän-Heterocyclus durch Substitution eines Phenylringes in ortho-Stellung/ Synthesis and Structure of an Unusual Molybdenum Heterocycle by Substitution of a Phenyl Ring in ortho-Position
Authors: Scholz Uwe , Noltemeyer Mathias , Roesky Herbert W. 
Published: March 2015

Abstract
The new ligand (Me3Si)2 NC(Ph)NP(Ph)2 N(SiMe3) (1) reacts with MOOCl 4 to yield the green metallacycle 4. 4 was characterized by X-ray diffraction. Crystals of 4 are monoclinic, space group P21/n with a = 1061.2(10). b = 1590.5(10), c = 1737.4(20) pm, β = 104.84(7)° and Z = 4. Mo is coordinated octahedrally by two nitrogens of the bifunctional ligand. by one oxygen and three chlorine atoms. The ligand undergoes cyclization, a bond being formed between N and one phenylic o-position.
[Fe(CO)4C(O)NMe2][C(NMe2)3]; die erste Strukturbestimmung einer Organometallverbindung mit dem Carbeniumion [C(NMe2)3]+/ [Fe(CO)4C(O)NMe2][C(NMe2)3]; the First Structure Determination on an Organometallic Compound with the Carbenium Ion [C(NMe2)3]+
Authors: Boese Roland , Bläser Dieter , Petz Wolfgang 
Published: March 2015

Abstract
The crystal structure of the carbamoyl complex [(CO)4FeC(O)NMe2][C(NMe2)3] (1) is described. It crystallizes in the triclinic space group PI (a = 7.876(3), b = 10.098(3), c = 12.067(5)Å, α = 94.25(3), β = 90.94(3), γ = 97.30(3)°, Z = 2) and consists of independent ions. The cation has a planar CN3 array with sp2 hybridized C and N atoms. The carbamoyl group of the anion occupies an axial position in the trigonal bipyramidal environment of the iron atom.
Element–Element-Bindungen, IV. Molekül-und Kristallstruktur des Tetramethyldiphosphans und -diarsans /Element–Element Bonds, IV. Molecular and Crystal Structure of Tetramethyldiphosphane and -diarsane
Authors: Mündt Otto , Riffel Heinz , Becker Gerd , Simon Arndt 
Published: March 2015

Abstract
The molecular and crystal structures of the isotypic compounds tetramethyldiphosphane 1 and -diarsane 2 have been determined by single crystal X-ray diffraction (monoclinic; C2/m; Z = 2; 1/2: -155/-144 °C\a = 540.6(2)/555.8(2); b = 1131.0(6)/l 136.7(6); c -602.5(2)/612.8(2) pm;β = 97.31(3)/95.24(3)°;P-P 221.2(1)/As-As 242.9(1) pm). In accordance with the crystallographically imposed symmetry 2/m, the molecules adopt antiperiplanar conformation. Their crystal structures are closely related to those of the homologues tetramethyldistibane 3 [1] and -dibismuthane 4 [3]. As found for the latter compounds, the E -E units (E = P, As) are also aligned in linear chains, but the intermolecular E···E contacts (P···P 381/As···As 370 pm) do not allow any extended interaction between molecules, which otherwise would result in thermochromic effects.
Triazaphosphinine – Reaktionen, Zwitterionen, P–B-Austausch/ Triazaphosphinines – Reactions, Zwitter Ions, P – B-Exchange
Authors: Meyer Matthias , Kadel Johannes , Oberhammer Heinz 
Published: March 2015

Abstract
2,2-Dichloro-triazaphosphinine (2) reacts with SbF3 in the molar ratio 3:1 to give the mixed halogenated triazaphosphinine (3). New addition compounds 5 and 6 can be formed in the reaction of the zwitter ion 4 and amines or in the reaction of 2.2-difluoro-triazaphosphinine (1) with KCN. Phosphorus-boron-exchange is observed in the reactions of 4 or 2 with BF3 · OEt2. The new C-B -N-heterocycles 8 and 9 are obtained. The gas-phase structure of 1 has been determined by electron diffraction. The scattering intensities are compatible with a planar ring conformation with C2v symmetry and with equivalent NC bond lengths (PN = 1.579(10) Å, NC = 1.299(7) Å, NPN = 109.2(7)°, PNC - 118.1(9)°, CNC - 119.6(7)° and NCN = 127.5(12)°).
Zur Polymorphie von TbCI3/ Polymorphism of TbCl3
Authors: Gunsilius Harald , Borrmann Horst , Simon Arndt , Urland Werner 
Published: March 2015

Abstract
3 different modifications of TbCl3 were synthesized. TbCl, (UCl3-type), probably in a metastable state, crystallizes in space group P63/m with a = 737.63(2) pm, c = 405.71(2) pm and Z - 2. TbCl3 (PuB3-type) crystallizes in space group Cmcm with a = 384.71(6) pm, b = 1177.37(7) pm. c = 851.77(4) pm and Z = 4. h-TbCl3, the high temperature phase being stable above 790 K. crystallizes in space group P42/mnm with a = 642.51(4) pm, c = 1177.14(18) pm and Z = 4.
Synthese und Kristallstruktur von (Cyclopentadienyl)(dicarbonyl)(1,5-di-/Molyl-pentaazadienido)molybdän, (Cp)Mo(CO)2(tolN5tol)/ Synthesis and Crystal Structure of (Cyclopentadienyl)(dicarbonyl)(1,5-di-p-tolyl-pentaazadienido)molybdenum, (Cp)Mo(CO)2(tolN5tol)
Authors: Beck Johannes 
Published: March 2015

Abstract
(Cp)Mo(CO)2(tolN5tol) is formed in the reaction of (Cp)Mo(CO)3Cl with tolNN(NH)NNtol and NaOH in ethanol. It forms red platelike crystals from THF/hexane which crystallize in the monoclinic space group P21/n with the lattice parameters a = 765.6(2), b = 2372.3(3), c = 1149.4(2) pm, β = 97.06(2)°, Z = 4. The structure consists of monomeric complexes. The pentaazadienido ligand chelates with its nitrogen atoms N1 and N3 the Mo atom of a (Cp)Mo(CO)2 unit. The nitrogen atom N5 is not coordinated to the metal atom. Although asymmetrically bonded, the all trans N5 zig zag chain is planar. The N -N distances in the four membered chelate ring are nearly equal (N1 - N2 = 131.0 and N2 - N3 = 132.6 pm)
meso-Substituierte Porphyrine, 5. Korbporphyrine meso-Substituted Porphyrins, 5. Basket Porphyrins
Authors: Volz Heinrich , Hassler Michael 
Published: March 2015

Abstract
2-Pyrryl-(m-terphenyl)-carbinol and 2-pyrryl-(3,3″,5.5″-tetra-t-butyl-m-terphenyl)-carbinol are cyclized in acidic medium to the corresponding raeso-tetraarylporphyrins. The meso-tetraarylporphyrins are transferred to the iron and manganese complexes. The reactions of the iron porphyrins with OH- are studied and the products of these reactions are characterized.
The Structure and Absolute Configuration of Cyclotirucanenol, a New Triterpene from Euphorbia tirucalli Linn
Authors: Khan Abdul Qasim , Ahmed Zaheer , Kazmi Najam-ul-Hussain , Malik Abdul , Afza Nighat 
Published: March 2015

Abstract
The structure and absolute configuration of “cyclotirucanenol” a new triterpene isolated from Euphorbia tirucalli has been established as 24β-methyl-9β-19-cyclolanost-20-en-3β-ol through chemical and spectroscopic studies including 2D-NMR.
Ceramid-1-phosphoethanolamine aus Myxococcus stipitatus/ Ceramide-1-phosphoethanolamines from Myxococcus stipitatus
Authors: Stein J. , Budzikiewicz H. 
Published: March 2015

Abstract
The structures of six ceramide-1-phosphoethanolamines have been elucidated which differ in the long chain base as well as in the fatty acid component
Notizen: High-field (500 MHz) 1H NMR Spectra of Retinoic Acids and Arotinoids by Two-dimensional Chemical Shift Correlation (2D) Spectroscopy
Authors: Perly Bruno , Pappalardo Giuseppe C. , Klaus Michael , Montoneri Enzo 
Published: March 2015

Abstract
The 1H NMR spectra (in DMSO solution at 300 K) of retinoic acids (cis- and trans-isomers) and new arotinoids were run at 500 MHz and assigned by using homo- and heteronuclear two-dimensional (2D) chemical shift correlation experiments. Spectral analysis was indicating, on the basis of 7 values, that the ring C(l)-C(2)-C(3)-C(4)-C(5)-C(6) adopts, in all compounds, a chair conformation.
Über die Reaktion sekundärer Amine mit Lithiumtetrahydridoaluminat
Authors: Linti Gerald , Nöth Heinrich , Rahm Peter 
Published: March 2015

Abstract
Lithium-tris(diethylamino)hydridoaluminate, Lithium-bis(diisopropylamino)dihydridoaluminate. Lithium(tetramethylpiperidino)trihydridoaluminate, NMR Spectra, X-Ray Reactions of diethylamine, diisopropylamine and 2,2,6,6-tetramethylpiperidine with LiAlH4 in various ethers have been studied. Only two well-defined products result from Et2NH, namely LiAlH(NEt2)- and LiAl(NEt2)4 . If molar ratios of Et2NH:LiAlH4 smaller than 3:1 are employed all compounds of the series LiAlH4-n(NEt2)n (n = 0, 1, 2, 3) are present in solutions of tetra-hydrofuran and diglyme. In diethylether insoluble materials consisting predominantly of lithium diethylaminohydridoaluminates and, presumably, small quantities of Li3AlH6 are also formed. At ambient temperature diisopropylamine reacts slowly with LiAlH4 , and LiAlH2(NiPr2)2 can be isolated as a well-defined substitution product. 2,2,6,6-tetramethylpiperidine (tmpH) replaces only a single hydride from LiAlH4 with formation of LiAlH3 (tmp). The reactions have been monitored by 7Li, 13C and 27Al NMR spectroscopy, and the structure of LiAlH(NEt2)3 has been determined by X-ray analysis. The monoclinic compound contains chains of AlHN3 and LiHN3 tetrahedra linked through common edges.
Darstellungen und Strukturen viergliedriger Metall-Stickstoff-Ringe
Authors: Roesky Herbert W. , Seseke Ulrich , Noltemeyer Mathias , Sheldrick George M. 
Published: March 2015

Abstract
Ph3P=NSiMe3 (1) reacts with InCl3 , SnCl2 and FeCl3 to yield (Ph3P=N)2(InCl2)2 • 2DMF (2a), (Ph3P=N)2Sn2Cl4 • 2 CH3CN (3a) and (Ph3P=N)2 (FeCl2)2 (4). The X-ray single crystal structures of 2a, 3a and 4 are reported. The compounds form four-membered rings consisting of alternating metal and nitrogen atoms. 2a and 4 are symmetrical, but 3a has both a Sn(II)Cl and a Sn(IV)Cl3 group in the four-membered ring.
Molecular and Crystal Structure, and EPR Studies of Tetraphenylarsonium [Bis-(1,3-dithia-2-one-4,5-dithiolato)-nickelate], (AsPh4)[Ni(dmid)2]
Authors: Vicente R. , Ribas J. , Zanchini C. , Gatteschi D. , Legros J.-P. , Faulmann C. , Cassoux P. 
Published: March 2015

Abstract
The crystal structure of (AsPh4)[Ni(dmid)2 (dmid2- = 1,3-dithia-2-one-4,5-dithiolato) has been determined by X-ray diffraction studies: crystals are monoclinic, space group P21/n a = 14.724(2), b = 14.305(5), c = 15.570(3) Å, β = 92.20(1)°, V = 3277 Å3 , ᵨx = 1.63 g cm-3 for Z = 4, final conventional agreement indices R = 0.038 and Rw = 0.049 for 2115 unique, observed reflections and 211 variable parameters. The asymmetric unit contains one (AsPh4)+ cation and one [Ni(dmid)2] anion, both in general positions. The anions are isolated from each other by the bulky cations. The [Ni(dmid)2]- ion deviates strongly from planarity: the dihedral angle between the two Ni(dmid) moieties is 10.7°; one of the dmid ligand is almost planar, while the second one is severely puckered. Polycristalline powder and single crystal EPR spectra have been recorded at room temperature. Only one signal was observed in all crystal orientations. The angular depend-ences of the linewidth and of the g values have been determined, as well as the principal g values and directions. These results have been compared to those previously obtained for the analogue (n-Bu4N)[Ni(dmit)2 ] (drnit2- = 1,3-dithia-2-thione-4,5-dithiolato), and discussed in terms of the localization of the unpaired electron on the ligands. leading to a formal (III) and actual (II) nickel oxidation state.
Addukte von Alkalimetallhexacyanoferraten mit Hexamethylentetramin: Die Kristallstrukturen von Na3[Fe(CN)6] · 2C6H12N4 · 5H20 und K3[Fe(CN)6] · 2C6H12N4 · 4H2O
Authors: Meyer Hans-Jürgen , Pickardt Joachim 
Published: March 2015

Abstract
By diffusion of methanolic solutions of hexamethylenetetramine into aqueous solutions of hexacyanoferrates(III) of sodium and potassium, resp., single crystals of the adducts were ob­tained. Na3[Fe(CN)6] · 2C6H12N4-5H2O, orthorhombic, space group Pca21. Z = 4, a = 14.122(4). b = 14.380(4), c = 14.381(4) Å, 3153 reflections, R = 0.044. K3[Fe(CN)6]•2C6H12N4-4H2O, triclinic, space group P1̄, Z = 4, a = 14.125(4), b = 17.808(4), c =14.116(4) Å, α = 114.14(5), β = 94.91(4), γ = 108.36(5)°. 5550 reflections, R = 0.042. Both structures may be regarded as Elpasolite-Iike arrangements of [Fe(CN)6]3- ions, C6H12N4 molecules and [M2(OH2)x]3+ units (M = Na, K; x = 5, 4), linked together unsymmetrically by M-N contacts of metal ions and nitrogen atoms with mean distances of Na-NHMT = 264 pm. Na-NCYan = 243 pm, K-NHMT = 293 pm and K-Ncyan = 290 pm. Stabilization of the crystal structures is obtained by N---H-O hydrogen bonds of coordination water molecules in three dimensions.
Darstellung und Kristallstruktur von (PhN3)2C6H4[(OH)Ni(PhN 3H)2C6H4]2 · 2THF, einem dimeren Ni(II)-Komplex mit einem überbrückenden Bistriazenido-Liganden
Authors: Hörner Manfredo , Fenner Herton , Hiller Wolfgang , Beck Johannes 
Published: March 2015

Abstract
(PhN3)2C6H4[(OH)Ni(PhN3H)2C6H4]2 · 2THF is obtained by the reaction of [(PhN3)2C6H4]Na2 with aqueous NiCl2. It crystallizes from tetrahydrofuran/hexane in the monoclinic space group P21/n, with a = 1574.6(3), b = 2498.5(2), c = 1629.2(2) pm, β = 93.909(3)°, and Z = 4. The Ni atoms are bridged by the bis(phenyltriazenidyl)benzene group and two hydroxyl groups. Two neutral bis(phenyltriazenyl)benzene groups chelate each Ni atom to complete the distorted co­ordination sphere.
Kristall-und Molekülstruktur von N,N'-Bis(1,3-dimethylbenzo[b]-1,3,2-diazaboroIidin-2-yl)carbodiimid
Authors: Sawitzki Gisela , Einholz Wolfgang , Haubold Wolfgang 
Published: March 2015

Abstract
Crystals of the title compound (2) are monoclinic with a = 905.5(3), b = 593.6(2). c - 3243.5(8) pm, β = 95.63(2)°, Z = 4, space group P21/n. The molecule 2 neither has a C2-symmet-rical allene-type nor a D2d -symmetrical cumulene-type structure, but it has a non-linear B-N = C= N - B arrangement and is nearly planar. The central N = C= N angle has a value of 171.9(3)°, the B - N = C angles are 145.9(2)° and 163.1(3)°.
Neuartige basische Liganden für die homogenkatalytische Methanolcarbonylierung, XIX [1] Cobalt-katalysierte Carbonylierung von Methanol zu Essigsäure / Novel Basic Ligands for the Homogeneous Catalytic Carbonylation of Methanol, XIX [1] Cobalt Catalyzed Carbonylation of Methanol to Acetic Acid
Authors: Lindner Ekkehard , Reber Jens-Peter , Wegner Peter 
Published: March 2015

Abstract
The bi- to quadridentate 1,3-dioxolane and 1,4-dioxane phosphane ligands PhnP(CH2C3H5O2)3-n (1, 2). PhP(CH2C4H7O2)2 (3), and [-CH2P(Ph)CH2C4H7O2]2 (4) have been investigated with regard to their efficiency in the carbonylation of methanol to acetic acid using cobalt as a component of the catalyst. While 1, 2 are unstable towards acetic hydrolysis. 3 and 4 lead to methanol conversions of >95%, and selectivities to methyl acetate and acetic acid of 33%, and 60%, respectively.
Über die Reaktionen von Phosphoryliden mit homodinuklearen Organometallverbindungen des Molybdän und Wolfram / On the Reaction of Phosphorylides with Homodinuclear Organometallic Compounds of Molybdenum and Tungsten
Authors: Endrich K , Alburquerque P , Korswagen R. P , Ziegler M. L 
Published: March 2015

We report first the complete study of the reactions of [CpMo(CO)2]2 (Mo≡Mo) (1, Cp = η5-C5H5) with salt-free phosphorus ylides Ph3P=CHR (2, Ph = C6H5; R = H (2a), CH3 (2b), C3H7 (2c), C6H5 (2d)) and with the Nal-adducts of the ylides Ph3P=CMe2 (Me = CH3), PhMe2P=CH2 and (PhO)3P=CH2. With 2, products of the type Cp(CO)2LMo-MoL(CO)2Cp (7, L = ylide) were obtained, and the salt adducts gave addition compounds of the type Cp(CO)2LMo-MoL(CO)2Cp-2NaI (12, L = ylide). These very reactive products represent novel bisphosphonioalkyl complexes, and were characterized by IR, mass and 1H NMR spectrometry. The reaction of 1 with hexaphenylcarbodiphosphorane, C(PPh3)2, leads to a novel double addition product, Cp2Mo2(CO)4[C(PPh3)2]2 (14). Some reactions of compounds 7, 12 and 14 were also studied; 7d (L = CHPh -PPh3) reacts with NaNH2 yielding ammonia and the disodium salt of the novel dianionic complex [CpMo(CO)2(CPh-PPh3)]2
2- (15); 7a (L = CH2-PPh3) reacts with CH3I forming CpMo(CO)3CH3 and traces of CpMo(CO)2(PPh3)I; all compounds of types 7,12 and 14 react with adsorbents (Silica-gel, Al2O3, etc.); thus chromatography is impossible, even under strict protection from air and humidity. A study of the processes occurring during chromatography under various conditions and the resulting products are also reported and discussed.
[CpW(CO)3]2 (18) reacts with 2a forming also a bisphosphonioalkyl complex [CpW(CO)2L]2(L = CH2=PPh3); in this case, the ylide substitutes two carbonyl groups in 18. The compounds [Cp*M(CO)2]2 (M≡M) (Cp* = C5Me5 ; M = Cr, W) apparently do not react with phosphorous ylides; the corresponding Mo compound, [Cp*Mo(CO)2]2 , does react, but only the new mono-nuclear complex Cp*Mo(CO)2(PPh3)Cl (22) could be isolated.
Nitriles in Heterocyclic Synthesis: New Approaches for Synthesis of Some Pyridine Derivatives
Authors: Ibrahim N. S , Mohareb R. M , Shams H. Z 
Published: March 2015

Abstract
A variety of pyridines was prepared from reaction of N-benzylidenecyanoethanoic hydrazide (2) with malononitrile, benzoylacetonitrile, cyanoacetamide and cinnamonitrile derivatives. The reactivity of 2 towards a variety of ketones was studied.
Perchlorierte Poly-arylen-Derivate / Perchlorinated Poly-arylene Derivatives
Authors: Fritz Heinz P. , Trübenbach Thomas 
Published: March 2015

Abstract
Poly-arylenes, which can be doped to electronic conduction, can be perchlorinated by SCl2 in CCl4 in the presence of iron metal. These polymers can be modified by introduction of CN or PPh2 groups, which can function as ligating groups for metal species.
Tetraphospholan-Bildung via Phosphaalken durch LiSnPh3-katalysierte PhP-Übertragung / Formation of a Tetraphospholane via Phosphaalkene by LiSnPh3-Catalyzed Transfer of PhP Units
Authors: Zirzow Karl-Heinz , Schmidpeter Alfred 
Published: March 2015

Abstract
Lithium triphenylsilyl-phenylphosphide (3), X = SiPh3 , reacts with ketones to give tetraphenyl-phospholanes (6). In an initial step a phosphaalkene 5 is formed, which then adds three more phenylphosphinidene units. This second step can be performed independently, and the PhP units can be furnished by pentaphenylcyclopentaphosphane (1) if the reaction is catalyzed by lithium triphenylstannide (2), X = SnPh3.
Silberdiammin-disilber-hexacyanometallate(III): Kantenverknüpfte Doppeltetraeder-Einheiten Ag2N6 in den unterschiedlichen Strukturen von Eisen- und Cobaltkomplex / Silverdiammine Disilver Hexacyanometallates(III): Edge-Sharing Tetrahedra Ag2N6 in the Different Structures of Iron and Cobalt Complex
Authors: Ziegler B. , Seitz K. , Babel D. 
Published: March 2015

Abstract
The crystal structures of the monoclinic compounds Ag(NH3)2Ag2Fe(CN)6 (a = 948.2, b = 1235.5, c = 1246.8 pm, β = 94.98°. Z = 4. space group Cc) and Ag(NH3)2Ag2Co(CN)6 (a = 772.1, b = 1347.9, c = 1405.2 pm, β = 101.25°, Z = 4, C2/c) have been determined by x-ray methods from single crystals. Using 1947 and 2739 reflections, resp.. R factors of about 5% were reached. Both compounds are similar in containing approximately linear Ag(NH3)2
+ dumb-bells (Ag-N = 216 pm) and dimeric Ag2N6 units. The latter consist of distorted edge-sharing tetrahedra (average Ag-N = 229 and 231 pm, resp.), the cavities of which are provided by the nitrogen ends of six surrounding M(CN)6
3- octahedra (Fe -C =195 pm, Co -C = 189 pm, C - N = 115 and 114 pm, resp.). In the iron complex, which is elpasolite-related, the central Ag2N2 ring is planar (Ag-Ag = 327.0 pm). By contrast the unit is folded (Ag-Ag = 307.8 pm, dihedral angle 126° between AgN2 triangles) in the cobalt complex, which has a different structure as discussed in detail
Molybdännitridtrichlorid-2,3,3-trichloracrylnitril, [MoNCI3 · NC-C2Cl3]2 Synthese, IR-Spektrum und Kristallstruktur / Molybdenumnitridetrichloride-2,3,3-trichloroacrylnitrile, [MoNCl3 · NC—C2Cl3]2 Synthesis, IR Spectrum, and Crystal Structure
Authors: Khabou Abderraouf , Dehnicke Kurt 
Published: March 2015

Abstract
[MONCl3 · NC - C2Cl3]2 has been prepared by the reaction of MONCl3 with trichloromethyl isocyanidedichloride, CCl3NCCl2 , in CH2Cl2 suspension. The compound forms redbrown. mois-ture sensitive crystals, which were characterized by their IR spectrum as well as by a crystal structure determination (2482 independent observed reflexions, R = 0.048). Crystal data (-70 °C): Space group P21/c, Z = 2, a = 674.2(2); b = 2128.2(11); c = 786.0(4) pm: β = 102.81(3)°. [MONCl3 • NC-C2Cl3]2 forms centrosymmetric dimeric molecules via chloro bridges with Mo-Cl bond lengths of 240.7 and 276.0 pm. The longer MoCl bond of the MOCl2MO ring is caused by the trans influence of the nitride ligand; the MoN bond length of 167 pm corresponds with a triple bond. The 2,3,3-trichloroacrylnitrile ligand is bonded by its nitrogen atom with a bond length of Mo -N = 216 pm; the Mo-N≡C-C sequence is almost linear with a remarkable short C-C bond of 143.0 pm.
Amidinatokomplexe von Bor, Aluminium, Gallium, Indium und Zinn Die Kristallstrukturen von Ph-C(NSiMe3)2AICI2 und Ph-C(NSiMe3)2SnCl3 / Amidinato Complexes of Boron, Aluminium, Gallium, Indium, and Tin The Crystal Structures of Ph-C(NSiMe3)2AlCl2 and Ph-C(NSiMe3)2SnCl3
Authors: Ergezinger Christina , Weller Frank , Dehnicke Kurt 
Published: March 2015

Abstract
The trichlorides of aluminium, gallium, and indium, as well as boron tribromide and tin tetra-chloride react with N,N,N'-tris(trimethylsilyl)benzamidine to form the monomeric N.N'-bis-(trimethylsilyl)benzamidinato complexes Ph-C(NSiMe3)2MX2(M = B, Al. Ga, In; X = Cl, Br) and Ph -C(NSiMe3)2SnCl3 , respectively. All compounds have been characterized by their IR spectra, two of them by X-ray diffraction studies.
Ph - C(NSiMei)2AlCl2 : Space group C2/c, Z = 4, 1152 independent observed reflexions, R = 0.052. Lattice dimensions (19 °C): a = 1558.6(1), b = 1116.6(1), c = 1307.0(1) pm, β = 115.17(1)°. The compound forms monomeric molecules, in which the aluminium atom is tetra-hedrally coordinated by two chlorine atoms and by the two nitrogen atoms of the benzamidinato chelate. Bond length A1N = 188.2 pm.
Ph - C(NSiMe3)2SnCU: Space group P1̄, Z = 2, 3293 independent observed reflexions, R = 0.034. Lattice dimensions (19 °C): a = 980.1(1), b = 1025.9(1), c = 1230.5(2) pm. a = 68.40(1)°, β = 87.71(1)°, y - 68.92(1)°. The compound forms monomeric molecules, in which the tin atom is five-coordinated by three chlorine atoms and by the two nitrogen atoms of the benzamidinato chelate. Bond lengths SnN = 213.5 and 215.2 pm.
Metallocene o-Phenylenebis(phenylphosphido) Chelates of Molybdenum and Tungsten / Metallocene o-Phenylenebis(phenylphosphido) Chelates of Molybdenum and Tungsten
Authors: Köpf Hartmut , Richtering Verena 
Published: March 2015

Abstract
The reaction of the metallocene dichlorides Cp2MCl2 (Cp = η5-C5H5; M = Mo, W) with equimolar amounts of dilithium-o-phenylenebis(phenylphosphide) 1,2-(LiPPh)2C6H4 yields the five-membered chelate complexes Cp2M[1,2-(PPh)2C6H4] (M = Mo. 1; W, 2). Compounds 1 and 2 are characterized by IR, NMR and mass spectra
Struktur und Reaktivität von isoanellierten heterocyclischen Systemen mit 4nπ- und (4n+2)π-Elektronen, XVII [1] Diels-Aider- und Michael-Additionsreaktionen von 3-Alkoxy-2,4-dihydropyrrolo[3,4-b]indolen mit Ethindicarbonsäuredialkylestern / Structure and Reactivity of Isoannelated Heterocyclic Systems with 4nπ- and (4n+2)π-Electrons, XVII [1] Diels-Alder and Michael Addition Reactions of 3-Alkoxy-2,4-dihydropyrrolo[3,4-b]indoles with Dialkyl Acetylenedicarboxylates
Authors: Dyker Gerald , Kreher Richard P. 
Published: March 2015

Abstract
The reactions of 2-rm-butyl-3-methoxy-4-methyl-2,4-dihydropyrrolo[3,4-b]indole (3) with dialkyl acetylenedicarboxylates are decisively influenced by the solvent. In the presence of alcohols as protic and polar solvents Michael addition is prefered, while in aprotic and less polar solvents like ether the Diels-Alder reaction is favoured. Based on stereospecific hydrolysis and isotopic labeling dipolar intermediates are discussed. The results are of current interest for mechanistic and theoretical reasons
Reaktionsbeteiligung von Phosphonester-Nachbargruppen bei Amindehydrierungen / Participation of Phosphonate Neighbour Groups with Dehydrogenations of Amines
Authors: Möhrle Hans , Vetter Wolfgang 
Published: March 2015

Abstract
Aminomethanephosphonate. Mercury EDTA Dehydrogenation. Lactam. Formamide, Aminoalkylation Aminophosphonates 1-5 are dehydrogenated with mercury EDTA to the corresponding lactams 6-9 and surprisingly to the formamide derivative 10, The different rate of ester hydrolysis of these acylamine compounds, the steric requirements and the reaction mechanisms are dis-cussed.