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'X ray' in keywords Facet section ZfN Section B [X]

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1

1	Author	EdwardW. Abel, StuartA. Mucklejohn, T.Stanley Cameron, RuthE. Cordes	Requires cookie*
	Title	The Dimeric Phosphinimine Complex [CdI2(HN: PPh3)2]2 Containing N-H --I Hydrogen Bonds
	Reference	Z. Naturforsch. 33b, 339—340 (1978); received December 5 1977
	Published	1978
	Keywords	X-ray, Crystal Structure, Phosphinimine
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	TEI-XML for	default:Reihe_B/33/ZNB-1978-33b-0339_n.pdf
	Identifier	ZNB-1978-33b-0339_n
	Volume	33

2	Author	W. Stoeger, A. Rabenau	Requires cookie*
	Title	Tl6Ag2Iio9 ein Polyiodid mit Ag2-Paaren Darstellung, Eigenschaften und Kristallstruktur Tl6Ag2Iio, a Polyiodide with Ag2 Pairs Preparation, Properties, and Crystal Structure
	Abstract	TleAg2Iio forms hexagonal crystals with metallic luster. Under its own I2-pressure the m.p. is 302 °C. In vacuum or under inert gas TleAg2Iio decomposes above 170 °C forming 1 mole of I2. The space group is P62c with the lattice constants a = 10.480 A, c = 13.415 A and Z = 2. TleAg2Iio is built up by a framework of TIöIö with channels parallel to the c-axis. These channels contain Ag2 pairs with an Ag-Ag distance of 2.98 A and I\| _ -polyiodide ions, respectively.
	Reference	Z. Naturforsch. 33b, 740—744 (1978); eingegangen am 21. April 1978
	Published	1978
	Keywords	X-ray, Structure Determination, Polyhalides
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	TEI-XML for	default:Reihe_B/33/ZNB-1978-33b-0740.pdf
	Identifier	ZNB-1978-33b-0740
	Volume	33

3	Author	G. Struckmeier, J. Engel, U. Thewalt	Requires cookie*
	Title	Molekül-und Kristallstruktur des 5.5' -Diethoxycarbonyl-3.3' -diethyl-4.4' -dimethyl-pyrromethen-hydrobromids Crystal and Molecular Structure of 5,5'-Diethoxycarbonyl-3,3'-chethyl-4,4'-cÜmethyl-pyiTomethene Hydrobromide
	Abstract	The crystal and molecular structure of the title compound has been determined by X-ray diffraction. The compound possesses an (almost) planar Z configuration. The ions form ion pairs in the solid state: each bromide anion is connected via two hydrogen bonds with a cation. The crystal data are: space group P2i/n with Z = 4; cell dimensions a = 14.097(2), b = 11.591(2), c = 14.133(3) A, ß = 106,22(2)°.
	Reference	Z. Naturforsch. 33b, 753—755 (1978); eingegangen am 12. April 1978
	Published	1978
	Keywords	Pyrromethenes, X-ray, Molecular Structure
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	TEI-XML for	default:Reihe_B/33/ZNB-1978-33b-0753.pdf
	Identifier	ZNB-1978-33b-0753
	Volume	33

4	Author	Dieter Weber	Requires cookie*
	Title	CHsNHsSnBraJa-z = 0-3), a Sn(II)-System with Cubic Perovskite Structure
	Abstract	CH3NH3SnBr^l3 -.x [x = 0—3) has the cubic perovskite structure with the unit cell parameters a = 5.89 A {x = 3), a = 6.01 A (x = 2) and a = 6.24 A (x = 0) and Z = 1. The compounds show intense colour and conducting property. The U9 Sn Mössbauer data are consistent with the high symmetry environment of the Sn(II)-ion. A bonding model, using a "p-resonance-bonding", can explain the properties of the cubic system. The synthesis is described.
	Reference	Z. Naturforsch. 33b, 862—865 (1978); eingegangen am 5. Mai 1978
	Published	1978
	Keywords	Synthesis, X-ray, Mössbauer Spectra
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	TEI-XML for	default:Reihe_B/33/ZNB-1978-33b-0862.pdf
	Identifier	ZNB-1978-33b-0862
	Volume	33

5	Author	F. Fehér, B. Engelen	Requires cookie*
	Title	Beiträge zur Chemie des Schwefels, 116 [1] Kristall-und Molekülstrukturen von 1.2.4.5-Benzotetrathiepin und 3-Methyl-1.2.4.5-benzotetrathiepin Contributions to the Chemistry of Sulfur, 116 [1] Crystal and Molecular Structures of 1,2,4,5-Benzotetrathiepine and 3-Methyl-1,2,4,5-benzotetrathi
	Abstract	The structures of 1,2,4,5-benzotetrathiepine and 3-methyl-l,2,4,5-benzotetrathiepine were determined by X-ray structure analysis. The constitution of the molecules, which was proposed by way of spectroscopic data, could be verified. The conformation of the seven-membered rings is the chair form. The position of the methyl group in 3-methyl-1,2,4,5-benzotetrathiepine is equatorial with respect to the seven-membered ring. Details of the conformations are discussed. Bond distances and angles are compared with those in other molecules, which have similar structures.
	Reference	Z. Naturforsch. 34b, 426—430 (1979); eingegangen am 18. Oktober 1978
	Published	1979
	Keywords	X-ray, Cyclosulfanes, Conformation
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	TEI-XML for	default:Reihe_B/34/ZNB-1979-34b-0426.pdf
	Identifier	ZNB-1979-34b-0426
	Volume	34

6	Author	Paul Binger, MichaelJ. Doyle, Carl Krüger, Yi-Hung Tsay	Requires cookie*
	Title	Metallacycloalkane, III [1] Darstellung und Charakterisierung von a.a'-Dipyridyl-Nickelacyclopentan Preparation and Characterisation of a,a'-Bipyridyl-nickelacyclopentane
	Abstract	The title compound was synthesised from bis-l,5-cyclooctadienenickel, a,a'-bipyridyl and 1,4-dibromobutane in 83% yield and its structure determined by X-ray diffraction (a = 16.600, b = 10.837, c = 14.815 Ä; ß = 153.05°; C2/c, Z = 4; symmetry: C2 with square planar coordinated nickel; Ni-C: 1.949 A). a,a'-Bipyridylnickelcyclopentane reacts with maleic anhydride or methylacrylate under reductive elimination to give cyclobutane in 75 and 57% yield; considerable amounts of butenes are formed, in addition to cyclobutane, upon reaction with borontrifluoride-dibutylether or on thermolysis.
	Reference	Z. Naturforsch. 34b, 1289—1292 (1979); eingegangen am 16. Mai 1979
	Published	1979
	Keywords	Nickelacyclopentane, Preparation, Metallacycloalkane, X-ray
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	TEI-XML for	default:Reihe_B/34/ZNB-1979-34b-1289.pdf
	Identifier	ZNB-1979-34b-1289
	Volume	34

7	Author	B. Engelen, C. Freiburg	Requires cookie*
	Title	Kristallstruktur von Mangan(II)sulfit-Trihydrat, a-MnS03 * 3 H20 Crystal Structure of Manganese(II)sulfite Trihydrate, a-MnS03 * 3 H2O
	Abstract	The structure of a-MnS03 • 3 H20, space group P2i/n, Z = 4, Dm = 2.42, Dx = 2.425gcm-3, a = 6.6501(3), b = 8.9065(4), c = 8.7925(4) Ä, ß=* 96.105(3)°, was solved by the Patterson method and refined by Fourier and least-squares methods. All H atoms were located. The final R's are 2.1/3.2% for the 1749 observed/2280 measured reflexions. Coordination of Mn is octahedral involving O atoms from three water molecules and three different sulfite groups. MnOß octahedra are linked through sulfite sulfur. The Mn-0 distances range from 2.149(2) to 2.314(2) A. The S-0 distances of the sulfite group are 1.529(2), 1.529(2) and 1.544(2) A. The first two are elongated by one, the latter by two H bonds. The O-S-O angles are 103.25(9), 104.18(9) and 104.35(9)°.
	Reference	Z. Naturforsch. 34b, 1495—1499 (1979); eingegangen am 9. Juli 1979
	Published	1979
	Keywords	X-ray, Sulfites, Sulfite Hydrates
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	TEI-XML for	default:Reihe_B/34/ZNB-1979-34b-1495.pdf
	Identifier	ZNB-1979-34b-1495
	Volume	34

8	Author	Hans Siebert, Walther Jentsch	Requires cookie*
	Title	Rhombohedrally Crystallizing Zinc Hexacyanometalates(III) Zn3[M(CN)e]2
	Abstract	The preparation of a non-cubic modification of water-free hexacyanometalates(III) Zn3[M(CN)6]2 (M = Cr, Fe, Co) is described. The X-ray powder diagrams of these compounds have been indexed rhombohedrally, space group Dgd-R"3c, Z = 2.
	Reference	(Z. Naturforsch. 36b, 123—124 [1981]; eingegangen am 17. September 1980)
	Published	1981
	Keywords	X-ray, Zinc, Cyanometalates
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	TEI-XML for	default:Reihe_B/36/ZNB-1981-36b-0123_n.pdf
	Identifier	ZNB-1981-36b-0123_n
	Volume	36

9	Author	Barbara Balbach, Reinhold Alt, ManfredL. Ziegler	Requires cookie*
	Title	Structural Investigations on Four-Membered Ring Systems, III* Crystal and Molecular Structures of frattS-2,4-Bis(trimethylsilyl)-2,4-dihydro-l,3-dithietane- 1.1.3.3-tetroxide, 2,2,4,4-Tetramethyl-3-pyrrolidinocyclobutanone and 2.2.4.4-Tetramethyl-l-phenyl-3-pyrrolidinocyclobutanol
	Abstract	The molecular structures of the title compounds have been determined by X-ray methods. In the bis(trimethylsilyl) substituted dithietane the (CH3)3Si groups are in trans position; the C2S2-ring is planar. In the cyclobutanone the pyrrolidine group occupies an equatorial position, as does the phenyl group in the cyclobutanol. In the latter the hydroxyl group is trans to the pyrrolidine ring. The four-membered carbon rings are folded.
	Reference	Z. Naturforsch. 37b, 1005—1013 (1982); eingegangen am 6. April 1982
	Published	1982
	Keywords	X-ray, Cyclobutanol, Dithietanetetroxide
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	TEI-XML for	default:Reihe_B/37/ZNB-1982-37b-1005.pdf
	Identifier	ZNB-1982-37b-1005
	Volume	37

10	Author	H. Erbert, W. Roesky, Mathias Noltem, GeorgeM. Sheldrick	Requires cookie*
	Title	Synthese und Struktur des Trifluoracetyldicyanomethanids Synthesis and Structure of Trifluoroacetyldicyanom ethanide
	Abstract	A suspension of NaCN in CH3CN was treated with excess of C2F4. The resulting red solution was evaporated to dryness and a red amorphous solid remained. One part of this solid was dissolved in water and a solution of Ph4AsCl was added. During the work-up procedure two salts were isolated, yellow [Ph4A s'][C F 3C (0)C (C N)2~] l a and red [Ph4A s+][(NC)2CC(CN)C(F)NC(CN)2_] 2a. The products were characterized on the basis of field desorption mass spectroscopy for positive and negative ions, l a was further characterized by an X-ray single crystal investigation.
	Reference	Z. Naturforsch. 40b, 883 (1985); eingegangen am 7. März 1985
	Published	1985
	Keywords	X-Ray, Carbanion, Fluorine, Nitrile
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	TEI-XML for	default:Reihe_B/40/ZNB-1985-40b-0883.pdf
	Identifier	ZNB-1985-40b-0883
	Volume	40

11	Author	Gertrud Weiler, Gottfried Huttner, Laszlo Zsolnai, Heinz Berke	Requires cookie*
	Title	Phosphordonor-substituierte Formylmangan-Komplexe Phosphorous Donor Substituted Formyl Manganese Complexes
	Abstract	Phosphonomanganese complexes (CH 3 0) 2 (0)PMn(C0)3[P(0CH 3)3] 2 (lb), (CH 3 0) 2 (0)PMn(C0) 2 [P(0CH 3) 3 ] 3 (lc) are obtained via demethylation of the corresponding cationic substituted carbonylmanganese compounds with KHB(secBu) 3 . The reaction of NaBH 4 in methanol with cationic phosphorus donor substituted carbonyl manganese compounds leads to formyl complexes (OC) 3 L 2 MnCHO (L = P(OCH 3) 3 (3a), L = P(OEt) 3 (3c), L -P(0*Pr) 3 (3d), L = PPh 3 (3e)) and (OC) 2 [P(OCH 3) 3 ] 3 MnCHO (3b). 3d decomposes thermally to give an (OC) 3 [P(OzPr) 3 ] 2 MnH and an (0C) 2 [P(0/Pr) 3 ] 3 MnH complex. The latter has been characterized by an X-ray structure determination.
	Reference	Z. Naturforsch. 42b, 203—209 (1987); eingegangen am 22. August 1986
	Published	1987
	Keywords	Formyl, Hydride Complexes, X-Ray
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	TEI-XML for	default:Reihe_B/42/ZNB-1987-42b-0203.pdf
	Identifier	ZNB-1987-42b-0203
	Volume	42

12	Author	ManfredL. Ziegler, Klaus Blechschmitt, Harald Bock, Ernst Guggolz, RichardP. Korswagen	Requires cookie*
	Title	Über die Reaktivität von [(CH 3 ) 2 N] 6 W 2 (W=W) gegenüber CS 2 /S 8 und CS 2 /Se, Röntgenstrukturanalyse von [(CH 3 ) 2 NCS 2 ] 2 W(S)(S 2 ) Reactivity of [(CH 3 ) 2 N] 6 W 2 (W=W) Towards CS 2 /S 8 and CS 2 /Se 8 . X-Ray Structure Analysis of [(CH 3 ) 2 NCS 2 ] 2 W(S)(S 2 )
	Abstract	In this paper we report two improved preparation methods for [(CH 3) 2 N] 6 W 2 (W=W) (1), one starting from WC1 4 (yield 51%), and a second one starting from W 2 C1 6 (THF) 4 (ca. 60% yield). We have studied the reactions of 1 with different nucleophiles, among them triphenylalkylidenphos-phoranes (like Ph 3 P=CH 2 and Ph 3 P=CHPh • LiCl; Ph = phenyl), sulfur and CS 2 . 1 reacts with S 8 and CS 2 in hexane to yield the two new compounds (Me 2 NCS 2) 2 WS(S 2) (4) and W(CS 2 H)(Me 2 NCS 2) 2 (5), both containing dithiocarbamato ligands formed by insertion of CS 2 into the W-N bond. The two mononuclear compounds were characterized spectroscopically, in the case of 4 an X-ray diffraction structure analysis was performed. The reaction of 1 with Se and CS 2 , leads to the compounds 4, (Me 2 NCS 2) 2 W 2 S 4 (6) and [(Me 2 N) 2 C]CS 2 (7), which were also characterized spectroscopically. No Se-containing compounds could be isolated. 4 crystallizes monoclinically, C 5 2h -P2Jn, with a = 648.6(3), b = 1346.7(6) and c = 1745.9(7) pm, ß = 91.85(3)°, V = 1524xl0 6 pm 3 , Z = 4. The structure of the seven-coordinate tungsten compound is discussed and compared to complexes with similar ligands and geometry.
	Reference	Z. Naturforsch. 43b, 590—598 (1988); eingegangen am 28. Dezember 1987
	Published	1988
	Keywords	Reactivity, Synthesis, X-Ray
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	TEI-XML for	default:Reihe_B/43/ZNB-1988-43b-0590.pdf
	Identifier	ZNB-1988-43b-0590
	Volume	43

13	Author	HerbertW. Roesky, Ulrich Seseke, Mathias Noltemeyer, GeorgeM. Sheldrick	Requires cookie*
	Title	Darstellungen und Strukturen viergliedriger Metall-Stickstoff-Ringe Preparations and Structures of Four-Membered Metal-Nitrogen Rings
	Abstract	Ph 3 P=NSiMe 3 (1) reacts with InCl 3 , SnCl, and FeCl, to yield (Ph,P=N) 2 (InCl 2) 2 • 2 DMF (2a), (Ph 3 P=N) 2 Sn 2 Cl 4 • 2 CH 3 CN (3a) and (Ph 3 P=N) 2 (FeCl 2) 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)Cl 3 group in the four-membered ring.
	Reference	Z. Naturforsch. 43b, 1130—1136 (1988); eingegangen am 29. März 1988
	Published	1988
	Keywords	Indium, Tin, Iron, X-Ray
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	Identifier	ZNB-1988-43b-1130
	Volume	43

14	Author	Z. Naturforsch	Requires cookie*
	Title	Übergangsmetall-substituierte Diphosphene, XXIV [ 1 ]
	Abstract	Cheletrope [1 +4]-Cycloaddition von Azodicarbonsäureestern und -amiden an das metallsubstituierte Diphosphen (i75-C5M e5)(CO)2F e -P = P -Mes* (Mes* = 2,4,6-Bu3C6H 2). Struktur von (i/5-C5M e5)(CO)2F e -P (= P -M e s )\|N (C 0 2E t)N = C (0 E t)Ö \| Transition M etal Substituted Diphosphenes, XXIV [1] Cheletropic [1+4] Cycloaddition of Azodicarboxylic Esters and Amides to the Metal Substituted Diphosphene (^5-C5Me5)(CO)2F e -P = P -M e s * (Mes* = 2,4,6/Bu3C6H 2). Structure o f (^5-C5M e5)(CO)2F e -P(= P -M es)[N (C 0 2Et)N = C (0 E t)0 ]. L othar Weber, Holger Bastian, Achim Müller [2] und H artm ut Bögge [2] The diphosphenyl complex (>75-C 5M e5XCO)2F e -P = P -M e s * (1) (M es* = 2,4,6rBu3C6H2)
	Reference	Z. Naturforsch. 47b, 231—2 (1992); eingegangen am 9. Juli/26. September 1991
	Published	1992
	Keywords	Diphosphene, Cycloaddition, Azodicarboxylates, X-Ray
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	TEI-XML for	default:Reihe_B/47/ZNB-1992-47b-0231.pdf
	Identifier	ZNB-1992-47b-0231
	Volume	47

15	Author	PeterG. Jones, M. Artina, Näveke Und Arm, Blaschette	Requires cookie*
	Title	Polysulfonylamine, XXXI [1] Kristallstruktur von (1-Trichlormethylthio- 4-dimethylaminopyridinium)dimesylamid bei -9 5 °C Polysulfonylamines, XXXI [1] Crystal Structure o f 1-Trichloromethylthio- 4-dimethylaminopyridinium Dimesylamide at -9 5 °C
	Abstract	The crystal structure o f the title com pound was determined at -9 5 °C. It crystallizes in space group P 1 with a = 577.5(3), b = 820.2(3), c = 1916.6(8) pm, a = 83.34(2), ß = 82.83(2), y = 83.61(2)° and Z = 2. The final R value was 0.034 for 3019 unique observed reflections. The presence o f aggregates o f four ions (two cations and two an ions) in the solid state is observed, with short cat-ion-anion contacts Sn — 0 (290 pm) and Cl --O (298 pm). The bond lengths o f the 4-dimethyl-aminopyridinium moiety o f the cation suggest a semiquinoid resonance form with a double bond to the nitrogen o f the dim ethylam ino group and two localized double bonds in the ring. The ring, the dimethylamino group (except H atom s) and the Sn atom are coplanar. The S " -N bond length is 170.3 pm, the N -S " -C angle 99.6°. The S ° -C bond is approximately perpendicular to the ring plane.
	Reference	Z. Naturforsch. 47b, 441—4 (1992); eingegangen am 17. September 1991
	Published	1992
	Keywords	Pyridinium, Dimesylamide, Polysulfonylamine, X-Ray
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	TEI-XML for	default:Reihe_B/47/ZNB-1992-47b-0441_n.pdf
	Identifier	ZNB-1992-47b-0441_n
	Volume	47

16	Author	M. Ustafa Ate, HansJoachim Breunig, KlausH. Ebert, Rose Kaller, M. Artin Dräger, Ulrich Behrens	Requires cookie*
	Title	Strukturen von Tetramesityldistiban (Mes4Sb2) und Trimesitylstiban (M es3Sb) Structures of Tetramesityldistibane (Mes4Sb2) and Trimesitylstibane (Mes3Sb)
	Abstract	The crystal structure of tetramesityldistibane consists of isolated Mes4Sb2 molecules in the trans conformation (average distance S b -C 219 pm, distance S b -S b 284.9(1) pm, angles SbC2 9 7 °-100°, Sb2C 92°-109°). In the structure o f trimesitylstibane there are stacks of isolated tri gonal pyramidal Mes,Sb molecules (average distance S b -C 218 pm, angles SbC-, 104 -106°).
	Reference	Z. Naturforsch. 47b, 503—508 (1992); eingegangen am 18. O ktober 1991
	Published	1992
	Keywords	Tetramesityldistibane, Trimesitylstibane, X-Ray
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	Identifier	ZNB-1992-47b-0503
	Volume	47

17	Author	K. Urt Merzweiler, Ludwig Brands, Jürgen Spohn	Requires cookie*
	Title	Neue In2P2-Vierringe
	Abstract	Synthese und Kristallstrukturen von [{iPrIn(//-fBu2P)Cl}2] und [{Me3SiCH2In(/i-fBu2P)Cl}2l New Four-M em bered In2P2 Rings. Snythesis and Crystal Structures of [{/PrIn(//-/Bu2P)Cl}2] and [~{Me3SiCH2In(//-/Bu2P)Cl}2] The reaction of organoindium halides R InC l2 with /Bu2PSiMe3 leads to compounds of the type [{RIn(jU-rBu2P)Cl}2] (R = /P r : 1, M e3SiCH2: 2). According to the crystal structure deter minations 1 and 2 contain planar In7P, rings. The In atoms are coordinated to two bridging /Bu,P groups, a terminal alkyl group and a term inal
	Reference	Z. Naturforsch. 48b, 1315—1320 (1993); eingegangen am 29. M ärz 1993
	Published	1993
	Keywords	Indium, Phosphorus, X-Ray
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	Identifier	ZNB-1993-48b-1315
	Volume	48

18	Author	M. Arkus Brylak, Wolfgang Jeitschko	Requires cookie*
	Title	U3TiSb5, U3VSb5, U3CrSb5, and U3MnSb5 with "Anti"-Hf5Sn3Cu Type Structure
	Abstract	The title compounds have been prepared from the elem ental com ponents by arc-melting and subsequent annealing. Single crystals of U 3TiSb5 and U 3M nSb5 were obtained from a tin flux and their structures were determined from single-crystal X-ray data: P 63/mcm, Z = 2; a = 913.9(2), c = 611.2(1) pm, R = 0.011 (233 structure factors, 14 variables) for U 3TiSb5 and a = 916.8(2), c = 613.2(1) pm, R = 0.015 (427 structure factors, 14 variables) for U 3MnSb5. The lattice constants of the isotypic compounds are: a -908.2(2), c = 608.3(2) pm for U 3VSb5 and a -911.0(1), c = 611.5(1) pm for U^CrSb^. The structure of these antimonides may be regarded as an "anti"-type structure of Hf5Sn3Cu with the antimony atoms on the hafnium sites, while the positions of the uranium and transition metal atoms correspond to the posi tions of the tin and copper atoms. A comparison o f the interatomic distances of UVTiSbs with those of U 3Sb4, USb2, and a-antimony suggests oxidation numbers according to (U +III)3Ti+,v(S b l_III)3(S b 2_,I)2, where the Sb2 atoms form weakly bonded chains.
	Reference	Z. Naturforsch. 49b, 747—752 (1994); received D ecem ber 16 1993
	Published	1994
	Keywords	Lattice Constants, Antimonides, X-Ray
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	TEI-XML for	default:Reihe_B/49/ZNB-1994-49b-0747.pdf
	Identifier	ZNB-1994-49b-0747
	Volume	49

19	Author	Norbert Kuhn3, Riad Fawzi3, M. Anfred Steimann3, Jörg Wiethoff3, D. Ieter Bläserb, Roland Boeseb	Requires cookie*
	Title	Synthese und Struktur von 2-Imino-l,3-dimethylimidazolin [1] Synthesis and Structure of 2-Imino-l,3-dimethylimidazoline [1]
	Abstract	Deprotonation of the 2-amino-1,3-dimethylimidazolium salt 5 (obtained through methyla-tion of 2-am ino-l-m ethylim idazole (4)) by KH gives 2-im ino-l,3-dim ethylim idazoline 6. The trimethylsilylimino compound 14 is formed on the reaction of 6 with chlorotrimethylsilane in the ratio 2:1. Further reaction with chlorotrimethylsilane gives the silylated aminoimidazo-lium salt 15. The X-ray structures o f 5 and 6 are reported.
	Reference	Z. Naturforsch. 50b, 1779—1784 (1995); eingegangen am 23. Mai 1995
	Published	1995
	Keywords	Imidazole, Imine, X-Ray
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	Identifier	ZNB-1995-50b-1779
	Volume	50

20	Author	Norbert Kuhna, Hans Bohnena, Gerald Henkelb, Jörg Kreutzbergb	Requires cookie*
	Title	5-Tetramethyl-2-methylenimidazoline -an Olefin with Ylidic Properties [ 1]
	Abstract	A facile synthesis of l,3,4,5-tetramethyl-2-methylenimidazoline 5 (Im) starting from the pentamethylimidazolium ion (8) and KH is described. Boranes react with 5 to give the adducts ImBHi (11) and ImBF3 (18). With Mel and CH3C(0)C1 the imidazolium salts ImMe+ (19) and Im C (0)M e+ (20) are obtained. CS2 gives the zwitterionic compound ImCS2 (24) which is transformed into the cationic thiocarboxylic ester ImC(S)SCH2Cl+ on treatment with CH2C12. Reaction with chlorotrimethylsilane gives the imidazolium ion ImSiMe^ (26) which may be transferred into the disilylated imidazolium ion 28 via deprotonation and subsequent silylation, the silylated olefin 27 being the intermediate. Similarly, the cations ImSiR2Cl+ (29; R = Me, Ph) are obtained from 5 and the silanes R2SiCl2. The neutral adduct ImSnPh2Cl2 (32) is formed in the reaction of 5 with Ph2SnCl2. Iodine reacts with 5 to give the charge-transfer adduct Im l2 (35), which can be further transferred into the imidazolium salt Im l+I^ (36). verhilft Imidazolin-Derivaten des Typs 1 durch die Dominanz der Grenzstruktur 2 zu einer Ylid-artigen Bindungssituation. Als Belege können die Eigen schaften der 2-Chalkogenoimidazoline 1 (X = S [3,41, Se [4 -6 ], Te [4,7]) sowie des 2-Iminoimi-dazolins 3 (1 ,8 ] gelten. Die bekannte Polarisierung der olefinischen Dop pelbindung durch Substituenten mit +M-Charak-ter ist im Falle der Enamine [9] gut untersucht; durch Einbindung der Stickstoff-Atome des 1,1-Endiamins 4 in ein fünfgliedriges Ringsystem wird eine bemerkenswert hohe Basizität des Methylen kohlenstoffs erreicht [10]. Hierzu analog läßt sich durch Einbau eines olefinischen Kohlenstoffs in ein System zyklisch konjugierter 7 r-Elektronen gleich falls eine starke Polarisierung der olefinischen Dop pelbindung erreichen [11]. Die Kombination beider Effekte führt zum System des 2-Methylenimidaz-olins. Synthese und strukturelle Charakterisierung des Tetramethyl-Derivats 5 sind Gegenstand einer vorläufigen Mitteilung [12]. Über die Kupplungsre aktion von 5 zum Methinium-Kation 6 [13] sowie seine koordinationschemische Fixierung an Metall zentren (7) [14, 15] haben wir bereits an anderer Stelle berichtet.
	Reference	Z. Naturforsch. 51b, 1267—1278 (1996); eingegangen am 8. März 1996
	Published	1996
	Keywords	Imidazoles, Olefins, X-Ray
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	Identifier	ZNB-1996-51b-1267
	Volume	51

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