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61	Author	Z. Naturforsch	Requires cookie*
	Title	Untersuchungen zur Trifluoracetylierung der Methylderivate von Tryptamin und Serotonin mit verschiedenen Derivatisierungsreagentien: Synthesen, Spektroskopie sowie analytische Trennungen mittels Kapillar-GC
	Abstract	Die Trifluoracetylierungs-Reaktionen verschiedener N-Methylderivate des Tryptamins so wie von N-und O-Methylderivaten des Serotonins mit den Derivatisierungsreagentien: Tri-fluoracetanhydrid, N-Methylbistrifluoracetamid und Trifluoracetylimidazol wurde analytisch mittels Glas-Kapillar-GC untersucht und die Strukturen der trifluoracetylierten Reaktions produkte durch GC-MS-Kombination ermittelt. Fünf dieser Trifluoracetylderivate wurden außerdem präparativ dargestellt und durch MS, IR, 1H, 13C und 19F NMR-Spektren charakte risiert. Im Gegensatz zu Literaturangaben lassen sich die physiologisch interessanten Indol-ethylamine mit einer tertiärer Dimethylaminoseitenkette (z.B. DMT und Bufotenin) nicht unter den gleichen Reaktionsbedingungen wie bei den anderen Methylderivaten trifluorace-tylieren, da die tertiäre Aminogruppierung eine Trifluoracetylierungsreaktion eingeht. Das entsprechende nichtflüchtige N-trifluoracetylierte Produkt wurde von uns präparativ isoliert und spektroskopisch eindeutig charakterisiert.
	Reference	Z. Naturforsch. 54b, 397—414 (1999); eingegangen am 13. November 1998
	Published	1999
	Keywords	Analytical and Preparative Trifluoroacetylation, Trifluoroacetic Anhydride, N-Methylbistri-fluoroacetamide, Trifluoroacetylimidazole, Methylated Tryptamines
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	TEI-XML for	default:Reihe_B/54/ZNB-1999-54b-0397.pdf
	Identifier	ZNB-1999-54b-0397
	Volume	54

62	Author	Z. Afar Iqbalc, H.E J	Requires cookie*
	Title	Isoperadione: A New Triterpenoid from Salvia bucharica
	Abstract	V iqar U d d in A h m a d 3 *, M uham m ad Z ah id c, M uham m ad Shaiq A li3, Z ulfiqar A li3, N aseer A lam 3, R asool B akhsh T areenb, M uham m ad A new isomer of peradione (2) named as isoperadione (1) has been isolated along with peradione (2) and perovskone (3) from the hexane soluble part of Salvia bucharica. The structures of 1 -3 were elucidated with the aid of modern spectroscopic techniques.
	Reference	Z. Naturforsch. 54b, 415—418 (1999); received September 8 1998
	Published	1999
	Keywords	Salvia bucharica, Lamiaceae, Triterpenoids, Isoperadione, NMR Data
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	TEI-XML for	default:Reihe_B/54/ZNB-1999-54b-0415.pdf
	Identifier	ZNB-1999-54b-0415
	Volume	54

63	Author	Z. Naturforsch	Requires cookie*
	Title	Synthese von muscarinanalogen Epoxiden aus Campholen- und Fencholenverbindungen
	Abstract	Synthesis of M uscarin A nalogue Epoxides from C am pholenic and Fencholenic C om pounds K atrin A n h a lt3, K laus Schulze3, P eter Jörchel5, M arijana G avranic3 Muscarin, Cyclopentene Epoxide, Trimethylammonium Iodide, Campholenic and Fencholenic Derivatives In connection with the synthesis and epoxidation of campholenic and fencholenic derivati ves some trimethylammonium iodides (2 and 4) similar to muscarin were prepared. They may be of interest for the investigation of the cholinergic receptor. The stereochemistry of the epoxytrimethylammonium iodide 4a was determined by NMR and X-ray analysis.
	Reference	Z. Naturforsch. 54b, 419—423 (1999); eingegangen am 13. Oktober 1998
	Published	1999
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	TEI-XML for	default:Reihe_B/54/ZNB-1999-54b-0419.pdf
	Identifier	ZNB-1999-54b-0419
	Volume	54

64	Author	2. 2., Z. Naturforsch	Requires cookie*
	Title
	Abstract	-/erf-butyI-3,3'-bis(tri-m e th y lsily l)-l,l'-diazacobaltocen [1 ] 2.2..5.5'-Tetra-terr-butyl-3,3,-bis(tri-m eth y lsily l)-l,r-d iazaco b alto cen e [1] N o rb ert K uhn3 *, Stefan S tubenrauchb, D ieter B läserc, R oland B oesec The 1,1'diazacobaltocene pyr2Co (3) is obtai ned from the reaction of 2,5-di-terr-butyl-3-trime-thylsilylpyrrole (pyrH, 2) and CoCl2. The X-ray structure is reported.
	Reference	Z. Naturforsch. 54b, 424—426 (1999); eingegangen am 5. November 1998
	Published	1999
	Keywords	Heterocycles, Pyrroles, Cobalt X-Ray Data
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	TEI-XML for	default:Reihe_B/54/ZNB-1999-54b-0424_n.pdf
	Identifier	ZNB-1999-54b-0424_n
	Volume	54

65	Author	N. Orbert, K. Uhn, M. Anfred, Steim Ann, Gerd Weyers, Herrn	Requires 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

66	Author	Norbert Kuhn, Manfred Steimann3, Gerd Weyers3, Gerald Henkelh, Herrn	Requires 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

67	Author	KurtO. Klepp, Andreas Kolb	Requires cookie*
	Title	Komplexe Chalkogenide der IVa Metalle mit niedrigdimensionalen anionischen Partialstrukturen. Darstellung und Kristallstruktur von K2ZrTe3 und Rb2ZrTe3 Complex Chalcogenides of the IVa Metals with Low Dimensional Anionic Partial Structures. Preparation and Crystal Structures of K2ZrTe3 and Rb2ZrTe3
	Abstract	The isostructural compounds K2ZrTe3 and Rb2ZrTe3 were obtained at 1000°C by reacting K7Te and Rb9Te with stoichiometric amounts of Zr and Te. The compounds are monoclinic, mP24, space group P2,/c, Z = 4 with a = 9.089(3), b = 14.148(4), c = 6.986(3)Ä, ß = 105.90(1)° and a = 9.735(4), b = 14.300(7), c = 6.952(8) Ä, ß = 108.61(2)°, respectively. The crystal structure was determined from diffractometer data and refined to R = 0.030 for 1452 Fo's for K2ZrTe3 and R = 0.038 for 1131 Fo's for Rb2ZrTe3. The crystal structure is of a new type, characterized by infinite anionic chains, ^-[ZrTe3]2_ built up by octahedra sharing opposite faces which run along [001]. The mean Zr-Te bond lengths are 2.921 and 2.920 A, respectively. The alkali cations separating the chains are characterized by two different -distorted octahedral and pentagonal bipyramidal -chalcogen environments. E inleitung
	Reference	Z. Naturforsch. 54b, 441 (1999); eingegangen am 9. November 1998
	Published	1999
	Keywords	Crystal Structure, Complex Chalcogenides, Tellurides, Zirconium, Pseudo-one-dimensional solids
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	TEI-XML for	default:Reihe_B/54/ZNB-1999-54b-0441.pdf
	Identifier	ZNB-1999-54b-0441
	Volume	54

68	Author	K. O. Kleppa, J. Hieblb, H. Kollmannb, F. Rovenszkyb	Requires cookie*
	Title	The Crystal Structure of Dimethyl (2Z, 6Z)-2,7-bis-(benzyloxycarbonyl- amino)octa-2,6-diendioate: A Useful Precursor for Optically Pure 2,7-Diaminosuberic Acid
	Abstract	Crystal Structure, Dimethyl (2Z, 6Z)-2,7-bis-(benzyloxycarbonylamino)octa-2,6-diendioate Needle shaped single crystals of the dimethyl ester of (2Z, 6Z)-2,7-bis-(benzyloxycarbonyl-amino)-octa-2,6-diendioic acid (1), C26H28N2O8 were obtained by very slow cooling from methanol/ethylacetate solution 20:1. 1 crystallizes in the anorthic space group Pi (No.2) with a = 4.813(5), b = 12.277(6), c = 12.340(7) A, a =117.15(3)°, f3 = 97.52(4)°, 7 = 92.02(4)°, Z =1. The crystal structure was determined from diffractometer data (MoKa-radiation). It was solved by direct methods and refined to a conventional R of 0.054 for 1452 Fo's and 178 refined parameters. The molecule is characterized by the presence of an inversion center. In the crystal structure the molecules are stacked along the crystallographic a-axis. In this direction -which coincides with the needle axis of the crystals -each molecule is connected with its neighbors through almost linear N-H- • O-hydrogen bonds.
	Reference	Z. Naturforsch. 54b, 447—450 (1999); received November 12 1998
	Published	1999
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	TEI-XML for	default:Reihe_B/54/ZNB-1999-54b-0447.pdf
	Identifier	ZNB-1999-54b-0447
	Volume	54

69	Author	VictorA. Trusha, KonstantinV. Domasevitcha, VladimirM. Amirkhanov2, Joachim Sielerb	Requires cookie*
	Title	Structure of Tl(18-cr0wn-6){Cl3C C (0)N P (0)(0C H 3)2}: Coordination of the Ionic Multidentate Weakens the Interaction of the Metal Atom with the Crown Ether
	Abstract	The thallium(I) dimethyl-N-trichloroacetylamidophosphate complex with a 18-crown-6 of the composition Tl(18-crown-6){L} (L = {Cl3CC(0)NP(0)(0 CH3)2}_) has been prepared and characterized by means of IR spectroscopy and X-ray diffraction (orthorhombic, space group P2,2,2, with a = 8.660(1), b = 11.557(2), c =26.296(3) A, Z = 4, V = 2631.8(6) Ä3; R\ = 0.0285 and wR2 = 0.0558 for 4314 unique reflections). It was shown that (L~) is coordinatedoto the central atom in a bidentate manner via oxygen atoms of phosphoryl [Tl-O(l) 2.678(4) A] and carbonyl groups [Tl-0(2) 3.012(6) A], The Tl(18-crown-6)+ moiety adopts a typical "sunrise" coordination with the metal atom laying 1.134(2) A above the mean plane of the oxygen atoms of the macrocycle. This deviation is the highest value of the structurally examined Tl(18-crown-6)+ complexes. The Tl-O (etheric) separations are in the range 2.913(4) -3.198(5) A (av. 3.030(6) A).
	Reference	Z. Naturforsch. 54b, 451—455 (1999); received September 29 1998
	Published	1999
	Keywords	Thallium(I), Crown Ethers, Carbacylamidophosphates, X-Ray Data
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	TEI-XML for	default:Reihe_B/54/ZNB-1999-54b-0451.pdf
	Identifier	ZNB-1999-54b-0451
	Volume	54

70	Author	IgorO. Fritsky, Aldona Karaczynb, Henryk Kozłowski, Tadeusz Głowiakb, ElenaV. Prisyazhnaya3	Requires cookie*
	Title	Crystal and Molecular Structure of Two Tetradentate "Oxime-and-Amide" Ligands
	Abstract	Tetradentate Ligands, X-Ray Data Syntheses and X-ray structure analyses of two new tetradentate ligands with "oxime-and-amide" donor systems (N,N'-bis(2-hydroiminopropionyl)-l,2-diaminoethane and N,N'-bis(2-hydroxyiminopropionyl)-l,4-diaminobutane) were performed. The overall conformation of both ligands is distinctly different from that reported earlier for N,N'-bis(2-hydroxyimino-propionyl)-l,2-diaminopropane. The number of methylene groups critically influences the lig and geometry and may have distinct impact on the co-ordinating ability of the ligands.
	Reference	Z. Naturforsch. 54b, 456—460 (1999); received November 25 1998
	Published	1999
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	TEI-XML for	default:Reihe_B/54/ZNB-1999-54b-0456.pdf
	Identifier	ZNB-1999-54b-0456
	Volume	54

71	Author	M. Ludwig3, R. Niewab, R. Kniep	Requires cookie*
	Title	Dimers [A12N6]12-and Chains J j A lN ^ ] in the Crystal Structures of Ca6[Al2N6] and Ba3[Al2N4]
	Abstract	Pale yellow transparent single crystals of Ca6[Al2Nö] (P 2\/c, No. 14, a = 693.7(3), b = 614.9(3), c = 987.1(5) pm, ß = 94.01(5)°; Z = 4) and colourless transparent single crystals of Ba.^ALN*] (Pnna, No. 52, a = 617.9(2), b = 1005.2(4), c = 1023.0(4) pm; Z = 4) were obtained from reactions of mixtures of the representative metals with nitrogen at Tmax = 1000 °C. The crystal structure of CaöfALNft] contains isolated units [ALNftJ12-built of two edge-sharing tetrahedra. Ba3[ALN4] is an isotype of S r^A bN ^. The crystal structure contains infinite chains ^ [A1N^T2] of trans edge-sharing tetrahedra.
	Reference	Z. Naturforsch. 54b, 461—465 (1999); received December 18 1998
	Published	1999
	Keywords	Nitridoaluminates, Preparation, Crystal Structure
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	TEI-XML for	default:Reihe_B/54/ZNB-1999-54b-0461.pdf
	Identifier	ZNB-1999-54b-0461
	Volume	54

72	Author	IgorL. Fedushkina, MarcWeydertb Anatoly, A. Fagina, SergeiE N Efedovc, IgorL. Eremenko0, MikhailN. Bochkarev3 ', Herbert Schumannb, G. A. Razuvaev	Requires cookie*
	Title	Metallation of Calix[4]arene with Thulium Diiodide, TmI2(DME)3 : Molecular Structure of [(5,ll,17,23-Tetra-te/*-butyl-25,27-dioxo-26,28- dimethoxycalix[4]arene)thulium(III)iodide(diethyl etherate)]
	Abstract	Thulium Diiodide, Calix Arene [(5,11,17,23-Tetra-/e/t-butyl-25,27-dioxo-26,28-dimethoxycalix[4]arene)thulium(III)-iodi-de(diethyl etherate)] 1 is obtained by deprotonation of 5,1 l,17,23-tetra-/m-butyl-25,27-dihydroxy-26,28-dimethoxy-calix[4]arene with 2 equivalents of Tml2(DME)3 in THF.
	Reference	Z. Naturforsch. 54b, 466—468 (1999); received December 23 1998
	Published	1999
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	TEI-XML for	default:Reihe_B/54/ZNB-1999-54b-0466.pdf
	Identifier	ZNB-1999-54b-0466
	Volume	54

73	Author	B. Wedelb, K. Sugiyama3, K. Hiraga3, K. Itagakib	Requires cookie*
	Title	Zur Kristallchemie des ersten Blei-Zink-Silicium-Telluroxids: PbZn4SiTeOio On the Crystal Chemistry o f the First Lead Zinc Silicon Tellurium Oxyde PbZn4SiTeO 10
	Abstract	Single crystals of the new lead zinc silicon tellurium oxide PbZn4SiTeO10 have been prepared by solid state reaction in air. The compound is colourless and crystallizes in orthorhombic symmetryj space group Dih Pnma, with the cell parameters: a = 6.542 (5), b = 15.624(4), c = 8.280(4) A, Z = 4. The structure has been determined from a single crystal X-ray study and refined to the conventional values R = 0.032 and wR(F2) = 0.050. Zn~+ and Si4+ show tetrahedral and Te6+ octahedral coordination by 0 2~.The crystal structure is dominated by a ^ [Zn4O l0]12-framework with isolated Te066+ and Si044+ polyhedra. Pb2+ ions are incorporated in the network. The centres of negative charge of the lone of the Coulomb term of the lattice energy.
	Reference	Z. Naturforsch. 54b, 469—472 (1999); eingegangen am 3. Dezember 1998
	Published	1999
	Keywords	Lead, Zinc, Silicon, Tellurium, Crystal Structure
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	TEI-XML for	default:Reihe_B/54/ZNB-1999-54b-0469.pdf
	Identifier	ZNB-1999-54b-0469
	Volume	54

74	Author	Cornelia Borgmann, Christian Limberg, Läszlö Zsolnai, Katja Heinze	Requires cookie*
	Title	Syntheses, Structures, and Spectroscopic Properties of Alkoxide, Hydroxide, and Siloxide Complexes with (r73-Allyl)Mo Moieties
	Abstract	Salts with binuclear anions of the general formula [(?73-C3H4R)(CO)2Mo(^-OR')2(/i-OR")-Mo(CO)2(f?3-C3H4R) r (R = h , R',R" = Me, 2 ; R = CH3, R' = CH(CH3)2, R" = OH, 3; R = CH3, R' = OH, R" = OSiMe3, 4) have been synthesised via reaction of [(r/3-C3H4R)-Mo(CO)2(CH3CN)2(thf)]+BF4_ , 1, with NaOMe, NaO'Pr, and KOSiMe3. All products were characterised spectroscopically and investigated by single crystal X-ray analysis. In the case of 3 low temperature 2D-NMR spectra revealed that the solid state structure is maintained in solution and that the compound shows a trigonal twist-rearrangement at room temperature.
	Reference	Z. Naturforsch. 54b, 473—481 (1999); received October 28 1998
	Published	1999
	Keywords	Molybdenum Complexes, Allyl, Alkoxides, Hydroxides, NMR Data
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	TEI-XML for	default:Reihe_B/54/ZNB-1999-54b-0473.pdf
	Identifier	ZNB-1999-54b-0473
	Volume	54

75	Author	Markus Häp, TheoG. Illes, Thomas Kruck, Karl-Friedrich Tebbe	Requires cookie*
	Title	Dichloro
	Abstract	[bis(775-2,4-cyclopentadien-l-yl)aIkylphosphan]zirconium: PR(C5H4)2 ZrCl2 ; R = Me, Et, 'Pr, 'Bu Dichloro[bis(/7r'-2 ,4 -cyclopentadien-l-yl)alkylphosphine]zirconium: PR(C5H4)7ZrCL; R = Me, Et, 'Pr, ?Bu A series of new ansa-zirconocene dichloride compounds [PR(C5H4)2ZrCl2: R = Me (5), Et (6), 'Pr (7), ?Bu (8)] with phosphorus as bridging atom between the cyclopentadienyl rings have been prepared, isolated, and characterised by 'H, i3C, 31P NMR spectroscopy, mass spectrometry and elemental analysis. The X-ray structure of 5 is reported.
	Reference	Z. Naturforsch. 54b, 482—486 (1999); eingegangen am 22. Dezember 1998
	Published	1999
	Keywords	Zirconium Ansa-Metallocene, Cyclopentadienyl, Phosphine, Crystal Structure
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	TEI-XML for	default:Reihe_B/54/ZNB-1999-54b-0482.pdf
	Identifier	ZNB-1999-54b-0482
	Volume	54

76	Author	U. Petasch, H. Oppermann	Requires cookie*
	Title	Untersuchungen zum quasibinären System Bi2Te3/BiBr3 Investigations on the Pseudobinary System Bi-,Te3/BiBr3
	Abstract	The phase diagram of the pseudobinary sytem Bi2Te3/BiBr3 was investigated by DTA, total pressure measurements and X-ray phase analysis. Only BiTeBr exists as a ternary phase in this system. The compound melts congruently at 526 °C. The heat of formation and standard entropy were calculated from vapor pressure data: Z\H(BiTeBr, f, 298) = (-30,4 ± 1,4) kcal/mol; S°(BiTeBr, f, 298) = (36,2±2,9) cal/K mol.
	Reference	Z. Naturforsch. 54b, 487—190 (1999); eingegangen am 15. Januar 1999
	Published	1999
	Keywords	Bismuth Telluride Bromide, Phase Diagram, Barogram, Total Pressure Measurements, Thermodynamic Data
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	TEI-XML for	default:Reihe_B/54/ZNB-1999-54b-0487.pdf
	Identifier	ZNB-1999-54b-0487
	Volume	54

77	Author	Hans Bock, Norbert Nagel, Peter Eller, Herrn Professor, Manfred Eigen	Requires cookie*
	Title	Wechselwirkungen in Molekülkristallen, 153 [1 -3]. Wirt/Gast-Einschlußverbindungen von N,Nf-Ditosyl-/?-phenylendiamin- Derivaten: Die Kristallstrukturen von N,N'-Di(4-ethyl-benzosulfuryl)-/?- phenylendiamin und seinen Aggregaten mit Aceton und Cyclopentanon Interactions in Molecular Crystals, 153 [1 -3]. Host/Guest-Inclusion Compounds of N,N'-Ditosyl-/?-phenylenediamine Derivatives: The Crystal Structures o f N,N'-Di(4-ethyl- benzosulfuryl)-/?-phenylenediamine and its Aggregates with Acetone and Cyclopentanone
	Reference	Z. Naturforsch. 54b, 491—500 (1999); eingegangen am 26. Oktober 1998
	Published	1999
	Keywords	N, N'-Di(4-ethyl-benzosulfuryl)-p-phenylenediamine, Inclusion Compounds, Ketone Guest Molecules, Crystal Growth, Structures
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	TEI-XML for	default:Reihe_B/54/ZNB-1999-54b-0491.pdf
	Identifier	ZNB-1999-54b-0491
	Volume	54

78	Author	Hans Bock, Norbert Nagel, Peter Eller, Herrn Professor, Manfred Eigen	Requires cookie*
	Title	Wechselwirkungen in Molekülkristallen, 154 [1 -3]. Wirt/Gast-Einschlußverbindungen von NjN'-Ditosyl-p-phenylendiamin- Derivaten: Die Kristallstrukturen von N,N'-Di(4-nitro-benzosulfuryl)-/?- phenylendiamin und seinen Wasserstoffbrücken-Addukten mit Cyclo- pentanon, Cyclohexanon, Tetrahydrofuran, N,N-Dimethylformamid- sowie Pyridin Interactions in M olecular Crystals, 154 [1 -3]. Host/Guest-Inclusion Compounds o f N,N'-Ditosyl-/?-phenylenediamine Derivatives: The Crystal Structures o f N,N'-Di(4- nitro-benzosulfuryl)-/?-phenylenediamine and its Hydrogen-Bonded Adducts with Cyclopentanone, Cyclohexanone, Tetrahydrofurane, N,N-Dimethylformamide as well as Pyridine
	Reference	Z. Naturforsch. 54b, 501—514 (1999); eingegangen am 26. Oktober 1998
	Published	1999
	Keywords	N, N'-Di(4-nitro-benzosulfuryl)-p-phenylenediamine, Inclusion Compounds, Hydrogen Acceptor Guest Molecules, Crystal Growth, Structures
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	TEI-XML for	default:Reihe_B/54/ZNB-1999-54b-0501.pdf
	Identifier	ZNB-1999-54b-0501
	Volume	54

79	Author	F. K. Ubela, H. Billb, H. H. Ag, Em An	Requires cookie*
	Title	Low Temperature Crystal Growth and Structure of Ordered Ba7F12Cl2
	Abstract	of composition Ba7F12Cl2 were obtained by a reaction at room temperature be tween Ba2+/Cl"/F_ in a gel of agar-agar/water. The hexagonal crystals have space group P6, «=1064.69(8), c=417.89(5)pm, V=410.24(8) 106 pm3 and Z=l. The anions form a propeller type network located in tunnels parallel to the chex axis; the chloride ions are located at the center on the propeller axes. The Ba2+ ions are coordinated by a (distorted) tricapped trigo nal environment of fluoride and chloride anions. Disorder is present for one particular Ba2+ site. The average structure is isotypic with the structure of Pb7F)2Cl2.
	Reference	Z. Naturforsch. 54b, 515—518 (1999); received November 30 1998
	Published	1999
	Keywords	Bariumfluorochloride, Hexagonal Crystal Structure, Crystal Growth, Low Temperature Gel Method Crystals
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	TEI-XML for	default:Reihe_B/54/ZNB-1999-54b-0515.pdf
	Identifier	ZNB-1999-54b-0515
	Volume	54

80	Author	Z. Naturforsch	Requires cookie*
	Title	Darstellung chiraler heterocyclischer /?-Aminosäureester
	Abstract	/3-Amino-acid Esters, Bicyclic Heterocyclic Compounds, Intramolecular 1.3-Dipolar Cycloaddition, Nitrones, Stereocontrol Chiral /3-amino alcohols were successively prone to N-benzylation, O-allylation and oxida tion of the resulting benzylamino group to give nitrones 3 which on hydrolysis afforded chiral hydroxylamines H0-NH-CH(R)-CH?-0-C H 2-CH=CH2 ((S)-4: R = Me, Bn, /Pr. (R)-4: R = Et). Swern oxidation of methyl 2,2-dimethyl-3-hydroxypropionate (16) and treatment of the resulting aldehyde 17 with hydroxylamines (S)-4b (R = Bn) or (R)-4d (R = Et) provided nitrones 18 that underwent an intramolecular 1,3-dipolar cycloaddition on heating yielding the bicyclic /3-amino-acid esters 19b and ent-19d, respectively. Reductive cleavage of the N,0-bond of compounds 19 afforded the eight-membered ring compounds 20b and ent-20d, re spectively. N-Benzylalaninol (22) was treated with /3-bromo-methacrylate to give the amino alcohol 23. Swern oxidation and subsequent treatment with N-ferf-butylhydroxylamine provided the bicyclic ester 26a (R = r-Bu) via the corresponding nitrone 24. Oxime 25 was prepared in an analogous way as 24 with unsubstituted hydroxylamine. It underwent an intramolecular 1.3-dipolar cycloaddition yielding 26b on heating in toluene. Reduction of 26a afforded the pyr-rolidine-carboxylic ester 27a.
	Reference	Z. Naturforsch. 54b, 519—531 (1999); eingegangen am 20. November 1998
	Published	1999
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	TEI-XML for	default:Reihe_B/54/ZNB-1999-54b-0519.pdf
	Identifier	ZNB-1999-54b-0519
	Volume	54

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