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'Heterocycles' in keywords

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1	Author	Uwe Klingebiel, Dieter Bentmann	Requires cookie*
	Title	Benzo(c)-l / 4 .2-thiazol, ein neues bicyclisches 1 Orr-System Benzo(c)-l A 4 ,2-thiazol. a New Bicyclic 10 ^-System
	Abstract	In the reaction of lithiated N-(fluorodimethyl-silyl)-2,4,6-trimethylaniline with bis(trimethyl-silyl)-sulfurdiimide LiF is eliminated and a benzo(c)-l A 4 ,2-thiazol is formed. Trifluoroacetic acid reacts with this thiazol to give the trifluoro-acetate.
	Reference	(Z. Naturforsch. 34b, 123—124 [1979]; eingegangen am 28. September 1978)
	Published	1979
	Keywords	Lithio-aminofluorosilane, Sulfurdiimide, Heterocycle, Trifluoroacetate
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	TEI-XML for	default:Reihe_B/34/ZNB-1979-34b-0123_n.pdf
	Identifier	ZNB-1979-34b-0123_n
	Volume	34

2	Author	Adonis Georgiades, H. P. Latscha	Requires cookie*
	Title	Reaktion von Triphenylbismutan mit aliphatischen Dicarbonsäuren Reactions of Triphenylbismuthan with Aliphatic Dicarbonic Acids
	Abstract	By the reaction of Bi(C6Hs)3 with oxalic, malonic, succinic and maleic acids, five-, six-and seven-membered heterocycles with Bi-and O-atoms are formed. During the reaction two phenyl groups are cleaved off.
	Reference	Z. Naturforsch. 35b, 1000—1001 (1980); eingegangen am 18. Dezember 1979/8. April 1980
	Published	1980
	Keywords	Heterocycles, Triphenylbismuthan, Aliphatic Dicarbonic Acids
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	Identifier	ZNB-1980-35b-1000
	Volume	35

3	Author	Martin Dräger	Requires cookie*
	Title	5-Chlor-5-phenyl-l-oxa-4.6-dithia-5-stannocan, ein diplanarer Übergangszustand bei der Racemisierung der Wanne-Sessel- Konformation in einem 8-Ring [1] 5-Chloro-5-phenyl-l-oxa-4,6-dithia-5-stannocane, a Diplanar Transition State for the Racemisation of the Boat-Chair Conformation in an Eight-Membered Ring [1]
	Abstract	The title compound has been synthesized from PhSnCl3 and the disodium salt of bis(2-mercaptoethyl)ether. The crystal structure has been determined and refined to R — 0.033. The conformation of the eight-membered heterocycle is slightly disordered and represents a diplanar form, which is generally considered the transition state near the saddle point of the energy surface between the two enantiomers of the boat-chair con-formation. The configuration around tin is a trigonal bipyramid with equatorial sulfur atoms, an equatorial phenyl group and with axial atoms CI and O (transannular distance Sn--0 241 pm).
	Reference	Z. Naturforsch. 36b, 437—440 (1981); eingegangen am 4. Februar 1980
	Published	1981
	Keywords	Tin, Heterocycles, Conformation, Transition State
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	TEI-XML for	default:Reihe_B/36/ZNB-1981-36b-0437.pdf
	Identifier	ZNB-1981-36b-0437
	Volume	36

4	Author	R. M. Mohareb, S. M. Fahmy	Requires cookie*
	Title	Activated Nitriles in Heterocyclic Synthesis: A Novel Synthesis of Pyridazine, Pyrimidine, Pyridine and Pyrano[4,3-b]pyridine Derivatives
	Abstract	Diethyl-3-amino-2-cyano-2-pentendioate (1) reacts with aromatic amines and aminohetero-cyclic compounds to yield amide derivatives (2 c—h). The latter derivatives were utilised in syn-thesis of pyridazines (4a, b), pyrimidine (6), pyridone (9) and pyrano[4,3-b]pyridine (16a, b) derivatives via reaction with aryldiazonium chloride, trichloroacetonitrile, sodiummethoxide and cinnamonitrile derivatives, respectively.
	Reference	Z. Naturforsch. 40b, 664—668 (1985); received December 5 1984
	Published	1985
	Keywords	Activated Nitriles, Heterocycles, Pyridazine Derivatives
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	TEI-XML for	default:Reihe_B/40/ZNB-1985-40b-0664.pdf
	Identifier	ZNB-1985-40b-0664
	Volume	40

5	Author	HerbertW. Roesky, Karsten Swarat, Frank Edelmann	Requires cookie*
	Title	Darstellung eines cyclischen Ferrocenderivates mit Wolfram (VI) Preparation of a Cyclic Ferrocene Derivative of Tungsten(VI)
	Abstract	Ph2PC 5 H4FeC 5 H4PPh2 (1) reacts with Me3SiN3 with evolution of nitrogen to yield (Me3SiN = PPh2C 5 H4)2Fe (2). Treatment of 2 with WF6 results in the formation of (C 5 H4PPh2N)2FeWF4 (3). 3 is a rare example of a metal complex containing two metal atoms in very different oxidation states.
	Reference	Z. Naturforsch. 43b, 231—232 (1988); eingegangen am 13. Oktober 1987
	Published	1988
	Keywords	Phosphorus, Heterocycles, Mass Spectra
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	TEI-XML for	default:Reihe_B/43/ZNB-1988-43b-0231.pdf
	Identifier	ZNB-1988-43b-0231
	Volume	43

6	Author	Amal Haoudi-M, Ahmed Azzah, Hans-Georg Mazzah, M. Schmidt, H. Athias Noltemeyer, W. Erbert, Roesky	Requires cookie*
	Title	Synthese und Struktur von achtgliedrigen Titan-und Zirkon-haltigen Siloxanringen Synthesis and Structure of Eight-Membered Titanium and Zirconium Containing Siloxane Rings
	Abstract	Reaction o f (fBu)2Si(OH)2 with TiCl4, TiBr4, T il4, and ZrCl4 affords eight-membered rings
	Reference	Z. Naturforsch. 46b, 587—5 (1991); eingegangen am 23. Juli 1990
	Published	1991
	Keywords	Titanium, Zirconium, Siloxane, Heterocycles
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	TEI-XML for	default:Reihe_B/46/ZNB-1991-46b-0587.pdf
	Identifier	ZNB-1991-46b-0587
	Volume	46

7	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

8	Author	Alexander Lichtblau, Hans-Dieter Hausen, Wolfgang Kaim	Requires cookie*
	Title	First Structural Characterization of an Easily Oxidized Derivative o f 1,4-Dihydroquinoxaline
	Abstract	The first crystal structure analysis o f a 1,4-dihydroquinoxaline is described by example o f the l,4-bis(re/-/-butyldimethylsilyl) derivative. In the solid state, this molecule exhibits a non-planar heterocycle with a dihedral angle o f 156.3° along the N -N axis in the boat-shaped 87r electron ring system. The alkyl groups o f the Si(/er/-Bu)M e2 substituents are arranged as to minimize steric repulsion. Despite the reduced n electron conjugation due to non-planarity, the com pound is oxidized reversibly to an EPR detectable radical cation at -0 .5 9 V vs. ferro cene in dichloromethane. However, the second oxidation to the fully aromatic dication is elec-trochemically irreversible. A comparison with previously obtained results illustrates the struc tural flexibility o f the non-aromatic 1,4-dihydro-1,4-diazine ring system which is strongly affected by rather weak non-bonded interactions.
	Reference	Z. Naturforsch. 48b, 713 (1993); eingegangen am 21. Dezember 1992
	Published	1993
	Keywords	Heterocycles, Organosilicon Compounds, Crystal Structure, Cyclic Voltammetry, Conformation
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	TEI-XML for	default:Reihe_B/48/ZNB-1993-48b-0713.pdf
	Identifier	ZNB-1993-48b-0713
	Volume	48

9	Author	Eva Estradaa, AntonR. Iekerb	Requires cookie*
	Title	Electrosynthesis of 2-Alkyl-4(3H)-quinazolinones
	Abstract	Electroreduction of 2-nitrobenzonitrile in a variety of alcohols leads to 2-alkyl-4(3 H)-quinazolinones via incorporation of the alkyl chain of the alcohols under cyclization. Physical properties and spectroscopic data of the quinazolinones and a probable pathway of their formation are given.
	Reference	Z. Naturforsch. 49b, 1566—1568 (1994); received July 7 1994
	Published	1994
	Keywords	Cathodic Reduction, 2-Nitrobenzonitrile Ring Closure, Alcohols, Heterocycles
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	TEI-XML for	default:Reihe_B/49/ZNB-1994-49b-1566.pdf
	Identifier	ZNB-1994-49b-1566
	Volume	49

10	Author	Wolfgang Kaim, Jörg Fees	Requires cookie*
	Title	The New Tetrafunctional i t Acceptor Ligand 3,6-Bis(2'-pyrimidyl)-l,2,4,5-tetrazine (bmtz): Diruthenium Complexes of bmtz and of its 1,4-Dihydro Form
	Abstract	Synthesis, physical properties and the coordination with two [Ru(bpy)2]2+ complex frag ments are described for 3,6-bis(2'-pyrimidyl)-l,2,4,5-tetrazine (bmtz), the first compact ligand which offers four equivalent a-diimine chelate sites. Spectroelectrochemistry of intensely blue {(a-bmtz)[Ru(bpy)2]2}"+, n = 4, reveals a very facile reduction (n -3) at -0 .4 0 V vs. FeCp2+/o and a metal oxidation (n = 5) at +1.18 V to a diruthenium (II/III) mixed-valent form which exhibits an intervalence transfer absorption at 1490 nm. The corresponding complex {(M-H2bm tz)[Ru(bpy)2]2}4+ with the 1,4-dihydro form H 2bmtz of the tetrafunctional ligand is oxidized in two steps at 0.58 and 1.07 V vs. FeCp2+/°.
	Reference	(Z. Naturforsch. 50b, 123—127 [1995]; received August 26 1994)
	Published	1995
	Keywords	Heterocycles, Complex Ligands, Ruthenium Compounds, Electrochemistry, Mixed Valency
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	TEI-XML for	default:Reihe_B/50/ZNB-1995-50b-0123.pdf
	Identifier	ZNB-1995-50b-0123
	Volume	50

11	Author	Z. Einab, A. H. Ozien, *. A., -W Areth, A. O. Sarhan, H. Assan, A. H. El-Sherief, A. Bdalla, M. M. Ahm Oud	Requires cookie*
	Title	A Convenient One-Pot Synthesis of Pyrazolo[3,4-d]pyrimidines and s-Triazolo[3,4-b][l,3?5]thiadiazines
	Abstract	The reaction of 5-am ino-3-aryl-l-phenylpyrazoles (la-d) with formaldehyde and secondary amines in boiling ethanol gave the corresponding 4-alkylaminomethyl derivatives (2a-f) and bis-(4-pyrazolyl)methane (4a,b) as byproduct. Such reaction with primary aliphatic and aro matic amines at room temperature afforded 1,3,5-trisubstituted (5a-h) and 1,3.5,7-tetrasubsti-tuted tetrahydropyrazolo[3,4-d]pyrimidines (8a-k) respectively in good yield. Similarily, the Mannich reaction of 5-m ercapto-3-phenyl-l,2,4-triazole (9) with secondary amines, in boiling ethanol, and primary aromatic amines, at room temperature, gave 2 -substituted aminomethyl derivatives (lOa-c) and (14a-g) respectively,while with primary aliphatic amines, p-toluidine and p-anisidine,at room temperature,and with other primary aromatic amines, in boiling etha nol, afforded the cyclized products l,2,4-triazolo[3,4-b]thiadiazines (13a-e); (15f,g) and (15a-e), respectively.
	Reference	Z. Naturforsch. 52b, 1401—1412 (1997); received June 19 1997
	Published	1997
	Keywords	Pyrazoles, Heterocycles, Triazoles, 'H NM R Spectra
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	TEI-XML for	default:Reihe_B/52/ZNB-1997-52b-1401.pdf
	Identifier	ZNB-1997-52b-1401
	Volume	52

12	Author	Max Herberhold, Silke Gerstmann, Bernd Wrackmeyer	Requires cookie*
	Title	Tetrakis(sulfurdiimido)silane, -germane and -stannane
	Abstract	Two tetrakis(sulfurdiimido)silanes [Si(NSNR)4 (R = rBu la, SiMe3 lb)], two germanes [Ge(NSNR)4 (R = rBu 2a, SiMe3 2b)] and one stannane [Sn(NSN?Bu)4Sn 3a] were prepared and characterised by 'H, l3C, i5N, 29Si and ll9Sn NMR spectroscopy in solution, and 3a was also studied in the solid state by 1 l9Sn CP/MAS NMR. Whereas la,b and 2a,b are monomeric in solution, the 119Sn NMR data suggest that 3a is associated both in solution and in the solid state, and that the tin atoms are hexa-coordinated. The attempted stepwise synthesis of la by using one, two, three or four equivalents of K[(NSN)rBu] led to mixtures of la with Cl3Si(NSNrBu) 4a, Cl2Si(NSN/Bu)2 5a, and ClSi(NSNfBu)3 6a. Only one sulfurdiimido ligand of the silane la reacted with hexachlorodisilane by oxidative addition and cleavage of the Si-Si bond to give the new heterobicyclic derivative 7a which is held together by two different coordinative N-Si bonds.
	Reference	Z. Naturforsch. 53b, 573—580 (1998); received March 30 1998
	Published	1998
	Keywords	Silicon, Germanium, Tin, Sulfur Diimides, Heterocycles, NMR Data
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	TEI-XML for	default:Reihe_B/53/ZNB-1998-53b-0573.pdf
	Identifier	ZNB-1998-53b-0573
	Volume	53

13	Author	R.R G Upta, M. Kum, Rakesh Kumar	Requires cookie*
	Title	Studies on Diamagnetic Susceptibility of Biologically Active Heterocycles, Part 2 Diamagnetic Susceptibilities of 4H-l,4-Benzothiazines and their Sulfones
	Reference	(Z. Naturforsch. 41b, 110 [1986]; received July 11 1985)
	Published	1986
	Keywords	4H -l, 4-B enzothiazines, Sulfones, Heterocycles, Diamagnetic Susceptibility
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	TEI-XML for	default:Reihe_B/41/ZNB-1986-41b-0110.pdf
	Identifier	ZNB-1986-41b-0110
	Volume	41

14	Author	Structure, M. Spectroscopy, H.-D Agnetism, WolfgangK. Hausena, Aim, Andreas Schulz3, MichaelM. Oscherosch3, Jeanne Jordanovb, C.E A, -CE N Grenoble	Requires cookie*
	Title	Erstmaliger Nachweis von ;r-;r-Dimerenbildung bei stabilen 1,4-Dialkylchinoxalinium-Radikalkationen. Struktur, Spektroskopie und Magnetismus First Evidence for 7t-7r-Dimerization of the Stable 1,4-Dialkylquinoxalinium Radical Cations
	Abstract	Crystal and molecular structure analysis o f 1,4-diethylquinoxalinium iodide shows a virtual ly planar quinoxaline ring with 11 conjugated 7r-electrons. In contrast to the triiodide o f the I,4,6,7-tetramethyl derivative or to the tetraphenylborate salt o f 1,4-diethylquinoxalinium cat ion radical the iodide exhibits 7r-7r-dimerized radical cations in the solid state with synplanar ethyl groups and a rather small intermolecular distance o f about 315 pm between the 7r-planes o f the primarily interacting 1,4-diazine rings. Solid state magnetic measurements between 2 and 300 K show considerably diminished magnetic m om ents due to partial spin-pairing, and UV/VIS spectroscopic measurements in acetonitrile reflect the 7r-7r-interaction in solution through the appearance o f a long-wavelength absorption band.
	Reference	Z. Naturforsch. 48b, 1181—1186 (1993); eingegangen am 1. Juni 1993
	Published	1993
	Keywords	Heterocycles, Radical Cations, Structure, M agnetism, A ssociation Phenomena
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	TEI-XML for	default:Reihe_B/48/ZNB-1993-48b-1181.pdf
	Identifier	ZNB-1993-48b-1181
	Volume	48

15	Author		Requires cookie*
	Title
	Reference	(Z. Naturforsch. 31b, 1436—1437 [1976]; eingegangen am 18. Juni 1976)
	Published	1976
	Keywords	Tetramethyl-l, 2-dioxa-4, 5-diazine, Photooxidation, Heterocycles, Luminol-Chemiluminescence
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	TEI-XML for	default:Reihe_B/31/ZNB-1976-31b-1436_n.pdf
	Identifier	ZNB-1976-31b-1436_n
	Volume	31

16	Author	Klaus Beelitz», Klaus Praefcke, -A, Salo Gronowitz	Requires cookie*
	Title	Pyrido [2,3-d] thieno [3,2-b] [6H]thiopyran - ein neues heterocyclisches Ringsystem [1] Pyrido [2,3-d]thieno[3,2-b] [6 H]thiopyran - a New Heterocyclic Ring System [1]
	Abstract	UV irradiation of S-(3'-thienyl)2-chloro-thionicotinate (1) in benzene solution leads via dehydrohalogenation and cj clization in competition to a-cleavage to formation of thio-lactone 2 besides aldehyde 3 and disulphide 4. 2 contains a new heterocyclic ring system which has been confirmed by spectroscopic methods. Einführung
	Reference	Z. Naturforsch. 34b, 1573—1575 (1979); eingegangen am 4. Juli 1979
	Published	1979
	Keywords	Organic Sulfur Compounds, Heterocycles, Thiolester, a-Cleavage, Dehydrohalogenation, Photocyclization, Aromatic Photosubstitution
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	TEI-XML for	default:Reihe_B/34/ZNB-1979-34b-1573.pdf
	Identifier	ZNB-1979-34b-1573
	Volume	34

17	Author	Claudia Bäk, Klaus Praefcke	Requires cookie*
	Title	und dessen Cycloreversion Organic Sulfur Compounds, XLVII [1] Dimerization of Monothiobenzil to a 1,3-Dithietane and its Cycloreversion
	Abstract	The thermal dimerization of monothiobenzil (lc) to a 1,3-dithietane (2c) and the photochemical cycloreversion of this heterocycle to 1 c is described.
	Reference	Z. Naturforsch. 35b, 372—375 (1980); eingegangen am 26. November 1979
	Published	1980
	Keywords	Heterocycles, Organic Sulfur Compounds, a-Oxothiones, 1, 3-Dithietans, 1, 3-Oxathiols, Photoreactions
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	TEI-XML for	default:Reihe_B/35/ZNB-1980-35b-0372.pdf
	Identifier	ZNB-1980-35b-0372
	Volume	35

18	Author	Josef Hahn, Tina Nataniel	Requires cookie*
	Title	Synthese und Eigenschaften von 3,6-Diorgano-3,6-dithio
	Abstract	l,2,4,5,3,6-tetrathiadiphosphorinanen; eine neue Möglichkeit zur Knüpfung von S—S-Bindungen Synthesis and Properties of 3,6-D iorgano-3,6-dithio-l,2,4,5,3,6-tetrathiadiphosphorinanes; a New Possibility of Forming S—S Bonds
	Reference	Z. Naturforsch. 42b, 1263 (1987); eingegangen am 15. Mai 1987
	Published	1987
	Keywords	3, 6-Diorgano-3, 6-dithio-l, 2, 4, 5, 3, 6-tetrathiadiphosphorinanes, 3, 5-Dimethyl-3, 5-dithio-l, 2, 4, 3, 5-trithiadiphospholan, Heterocycles, Formation of S -S Bonds
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	TEI-XML for	default:Reihe_B/42/ZNB-1987-42b-1263.pdf
	Identifier	ZNB-1987-42b-1263
	Volume	42