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21Author    Bernhard Glaser, ErwinP. Mayer, Heinrich Nöth, Wilfried Rattay, Ulrich WietelmannRequires cookie*
 Title    Beiträge zur Chemie des Bors, 190 [1] Synthese und Molekülstruktur von 1,2-Dihydroboreten und Azadiboretidinen Contribution to the Chemistry of Boron, 190 [1] Synthesis and Molecular Structure of 1,2-Dihydrodiboretes and Azadiboretidines  
 Abstract    [2+2]-Cycloadditions of 9-Fluorenylidentetramethylpiperidinoboranes have been studied with selected olefines, acetylenes and iminoboranes. No reactions with olefines were observed. While propiolic methylester reacts exclusively at the carbonyl bond producing the oxaboretane 5, alkines such as diethylamino-alkines, cyclo-octine and phenylacetylene provide access to the'1,2-dihy-droboretenes 6, 3 and 2. Tetramethylpiperidinoiminoboranes make 1.2.4-azadiboretidines 7 available. 6a and 7a contain a folded four-membered ring as shown by X-ray structure analysis. There is only a weak 1,3-intraannular interaction due to BN-;r-bonding of the boron atoms with their exocyclic amino group. 
  Reference    Z. Naturforsch. 43b, 449—456 (1988); eingegangen am 10. Dezember 1987 
  Published    1988 
  Keywords    Reactivity of Aminomethyleneboranes, Transannular Interaction, X-Ray, 1, 2-Dihydroboret Derivatives, 1, 24-Azadiboretidine Derivatives 
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 TEI-XML for    default:Reihe_B/43/ZNB-1988-43b-0449.pdf 
 Identifier    ZNB-1988-43b-0449 
 Volume    43 
22Author    CeyhanK. Ayran, Saim ÖzkarRequires cookie*
 Title    Synthesis and N M R Study of ( rf-l ,4-diphenyl-l ,3-butadiene)tricarbonyl- chromium(O)  
  Reference    Z. Naturforsch. 47b, 1051 (1992); received March 3 1992 
  Published    1992 
  Keywords    Chromium carbonyl, 1, 4-Diphenylbutadiene 
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 TEI-XML for    default:Reihe_B/47/ZNB-1992-47b-1051_n.pdf 
 Identifier    ZNB-1992-47b-1051_n 
 Volume    47 
23Author    Requires cookie*
 Title    Cleavage Reactions o f 5-Arylazo Derivatives o f l-M ethyl-2-benzyl-2-im idazolin-4-ones  
 Abstract    N azm i A b d e l L a t if K a s s a b , A b d e l H a m id H a k h a s h , and S a n n a O sm a n A b d A lla h The 5-arylazo-l-methyl-2-benzyl-2-imidazolin-4-ones (la-c) undergo ring cleavage 
  Reference    (Z. Naturforsch. 30b, 603—605 [1975]; received March 10 1975) 
  Published    1975 
  Keywords    Rearrangement Reaction, 1, 2, 4-Triazinones, Grignard Reaction 
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 TEI-XML for    default:Reihe_B/30/ZNB-1975-30b-0603.pdf 
 Identifier    ZNB-1975-30b-0603 
 Volume    30 
24Author    Nazmi Abd, Elatife Kassab, Sanaa Osman Abdallah, Hamed Abdel, Reheem Ead, Doreya ZakiRequires cookie*
 Title    Some New Tetrahydrothiopyrano[2,3-d]thiazole-2-thione Derivatives and their Biological Activities 3-Phenyl-2,4  
  Reference    (Z. Naturforsch. 31b, 376—379 [1976]; received August 14 1975) 
  Published    1976 
  Keywords    thiazolidinedithiones, 1, 4-Cycloaddition, Heterodienes, Synthesis, Biological Activities 
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 TEI-XML for    default:Reihe_B/31/ZNB-1976-31b-0376.pdf 
 Identifier    ZNB-1976-31b-0376 
 Volume    31 
25Author    EricaL. Weinberg, J.Thomas Burton, MichaelC. Baird, Max HerberholdRequires cookie*
 Title    A Novel Isomerization of an Electron-Rich Alkene  
 Abstract    Displacement of 2-methvlpropene from [Fp(Me2C = CH2)]BF4 (Fp = (/?5-C5H5)Fe(CO)2) by Z-1,2-dimethoxyethylene (Z-DME) gives [Fp(Z-DME)]BF4. Displacement by E-1,2-dimethoxyethylene (E-DME), in contrast, does not give the expected complex of E-DME, but rather the complex of the Z-alkene. A mechanism involving scission of the C = C bond of the coordinated alkene to give a bis-carbene intermediate is proposed. 
  Reference    Z. Naturforsch. 36b, 485—487 (1981); received February 9 1981 
  Published    1981 
  Keywords    Organoiron Complexes, Olefin Isomerization, 1, 2-Dimethoxyethylene 
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 TEI-XML for    default:Reihe_B/36/ZNB-1981-36b-0485.pdf 
 Identifier    ZNB-1981-36b-0485 
 Volume    36 
26Author    Hubert Schmidbaur, Thomas CostaRequires cookie*
 Title    Synthese eines Doppel-Carbodiphosphorans und seiner Vorstufen Synthesis of a Double-Carbodiphosphorane and its Precursors  
 Abstract    The reaction of 1,4-dibromobutane with bis(diphenylphospliino)methane (1) yields two products, one of which is identified as butane-l,4-bis[diphenyl(diphenylphosphinomethyl)-phosphonium bromide] (3 a). Transylidation of this bis-phosphonium salt using two equiv-alents of (CH3)3P = CH2 affords the bis-ylide [CH2CH2P(C6H5)2 = CH-P(C6H5)2]2 (4) in high yields. This conversion can be reversed on treatment of 4 with etheral HCl (to give 3b). Methylation of 4 with CH3I occurs at phosphorus, however, and produces the bis-semiylide salt (5), [CH2CH2P(C6H5)2CHP(C6H5)2CH3]2 2e 2Iö. Transylidation of 5 (again with (CH3)3P = CH2) leads to the bis-carbodiphosphorane (6), [CH2CH2P(C6H5)2 = C = P(C6H5)2CH3]2. All compounds were characterized by elemental and detailed NMR analyses. The second product of the above quaternisation reaction is a cyclic bis-phosphonium salt (2) with a seven-membered ring structure. 
  Reference    Z. Naturforsch. 37b, 677—79 (1982); eingegangen am 9. Februar 1982 
  Published    1982 
  Keywords    1, 4-Dibromobutane, Transylidation, Carbodiphosphorane, Bis-carbodiphosphorane, Ylides 
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 TEI-XML for    default:Reihe_B/37/ZNB-1982-37b-0677.pdf 
 Identifier    ZNB-1982-37b-0677 
 Volume    37 
27Author    Richard Neidlein, Dagmar Knecht, Alfred Gieren, Catalina Ruiz-PérezRequires cookie*
 Title      
 Abstract    The synthesis of 1 by reaction of phenanthro[9,10-c]-l,2,5-selenadiazole with ethylmagnesium-bromide and TeCI 4 is described; the X-ray structure analysis is reported. 
  Reference    (Z. Naturforsch. 42b, 84—90 [1987]; eingegangen am 9. August 1986) 
  Published    1987 
  Keywords    Chalkogen-Diimides, 1, 2, 5-Telluradiazole, X-Ray 
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 TEI-XML for    default:Reihe_B/42/ZNB-1987-42b-0084.pdf 
 Identifier    ZNB-1987-42b-0084 
 Volume    42 
28Author    Hans Möhrle, Heinz DwuletzkiRequires cookie*
 Title    Acylation Reactions of Enamines  
 Abstract    The ratio of isomeric enaminones, obtained by acylation of enamines with acid chlorides in the presence of triethylamine, depends on the possibility of forming isomeric enoles of the inter-mediate cyclobutanone adducts. 
  Reference    Z. Naturforsch. 42b, 503—506 (1987); eingegangen am 30. Oktober 1986 
  Published    1987 
  Keywords    Enamines, Enaminones, 1, 4, 5, 6-Tetrahydropyridines 
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 TEI-XML for    default:Reihe_B/42/ZNB-1987-42b-0503.pdf 
 Identifier    ZNB-1987-42b-0503 
 Volume    42 
29Author    Gabriele Rebera, Jürgen Riede3, Nils Wibergb, Gerhard Wagnerb, Gerhard MüllerRequires cookie*
 Title    Silaheterocyclen: Molekülstruktur eines 3-Oxa-2  
 Abstract    ,4,6,7-tetrasiIabicycIo[3.1.1]heptans Silaheterocycles: Molecular Structure of a 3-Oxa-2,4,6,7-tetrasilabicyclo[3.1.l]heptane A ccording to an X-ray structure analysis l,5-b is(di-rm -butylrnethylsilyl)-2,2.4.4,6.6,7,7-octa-m ethyl-3-oxa-2,4,6,7-tetrasilabicyclo[3.1. l]heptane (1) is a rigid bicyclic m olecule consisting o f a 1,3-disilacyclobutane ring whose 2,4 positions are bridged by a M e:Si —O —SiM e: fragment. The four-m em bered ring is non-planar with a dihedral angle o f 33.8° along the C —C axis. The intraring valence angles at carbon are significantly smaller than those at silicon leading to a transannular Si • • • Si distance o f only 2.558(1) Ä (triclinic, space group P I with a = 9.125(2), b = 12.668(2), c = 15.499(3) Ä , a = 101.25(1), ß = 87.87(1), y = 96.88(1)°. V = 1744.4 Ä 3, R (w R) = 0 .0 4 4 (0 .0 5 1) for 316 refined parameters and 5156 observables). 
  Reference    Z. Naturforsch. 44b, 796—799 (1989); eingegangen am 17. März 1989 
  Published    1989 
  Keywords    Crystal Structure Cyclic D isiloxane, 1, 3-Disilacyclobutane 
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 TEI-XML for    default:Reihe_B/44/ZNB-1989-44b-0796.pdf 
 Identifier    ZNB-1989-44b-0796 
 Volume    44 
30Author    Christian Müller, ThomasG. Meyer, Michael Farkens, R.Alf Sonnenburg, Reinhard SchmutzlerRequires cookie*
 Title    Zur Chemie der 4,6-D ioxo-l,3,5,2 A3-triazaphosphinane. Teil II*. Darstellung von 4,6-Dioxo-l,3>5,2 A3-triazaphosphinanen  
  Reference    Z. Naturforsch. 47b, 760—7 (1992); eingegangen am 30. Dezember 1991 
  Published    1992 
  Keywords    1, 3, 5-Triorganosubstituted Biurets, 1, 3, 5-Triorgano-Substituted 4, 6-D ioxo-l, 3, 5, 2A 3-triazaphosphinanes, N M R Spectra, M ass Spectra 
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 TEI-XML for    default:Reihe_B/47/ZNB-1992-47b-0760.pdf 
 Identifier    ZNB-1992-47b-0760 
 Volume    47 
31Author    Tristram Chivers, Masood Parvez, Peter ZoricakRequires cookie*
 Title    Preparation and X-Ray Structure of 4-BrC6H4CNSC(Cl)N  
 Abstract    The title compound was obtained in 82% yield by the intramolecular cyclization of 4-BrC6H4C(NSCCl3)[N(SiMe3)2] in CH2CI2 at 23°C. It crystallizes in the triclinic system, space group PI, a = 7.957(3) Ä, b = 10.864(5) A, c = 5.625(1) A, a = 95.94(3)°, ß = 97.79(2)°, 7 = 100.72(3)°, V = 469.2(3) A3, and Z -2. The bond lengths of the planar C2N2S ring indicate partial 7r-delocalization. 
  Reference    Z. Naturforsch. 52b, 557—559 (1997); received September 5 1996 
  Published    1997 
  Keywords    Crystal Structure, 1, 2, 4-Thiadiazole, Intramolecular Cyclization 
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 TEI-XML for    default:Reihe_B/52/ZNB-1997-52b-0557.pdf 
 Identifier    ZNB-1997-52b-0557 
 Volume    52 
32Author    Z. Ah Id, M. Aq, L+-, M. Ashooda, H. Asan, KevinT. Pott, M. Alik++, C., T. Anveer, A., N. Izam Ic, W. OlfgangRequires cookie*
 Title    Syntheses of Anomeric Pairs of New C-Nucleosides via 1,3-Dipolar Cycloaddition Reaction, Part I  
 Abstract    A convenient pathway to a variety of ß-and a-C-nucleosides has been developed by utiliz­ ing 1,3-dipolar cycloaddition reactions of various exocyclic and endocyclic heterocyclic ylides with ß (5a) and a (5b) anomers of ethyl 3-(2',3'-0-isopropylidene-5'-0-trityl-D-ribofurano-syl) propiolate, respectively. Assignment of configuration at exposition of the C-nucleosides could be made by a comparative study of the properties of corresponding a and ß anomers with a reasonable degree of certainity. 
  Reference    Z. Naturforsch. 52b, 1383—1392 (1997); received July 21 1997 
  Published    1997 
  Keywords    C-Nucleosides, 1, 3-Dipolar Cycloadditions 
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 TEI-XML for    default:Reihe_B/52/ZNB-1997-52b-1383.pdf 
 Identifier    ZNB-1997-52b-1383 
 Volume    52 
33Author    Tristram Chivers, Xiaorong Li, Masood ParvezRequires cookie*
 Title    Preparation and X-Ray Structure of 3,5-Dimethyl-1,4-dichloro-1,2,6- thiadiazine-1 -oxide  
 Abstract    The title compound was obtained by the reaction of 3,5-dimethyl-2//-l,2,6-thiadiazine-l,l-dioxide with PCI5 in chloroform. It crystallizes in the monoclinic system, space group P2\/c, a = 7.521(7) A, b = 8.400(4) A, c = 13.908(4) Ä, ß = 100.35(4)°, V = 864.4(8) A3, and Z = 4. The S(VI) atom lies 0.43 A out of the plane of the 7r-delocalized NCCCN unit. The mean S-N bond distance is 1.569(3) A. 
  Reference    Z. Naturforsch. 53b, 532—534 (1998); received December 18 1997 
  Published    1998 
  Keywords    Crystal Structure, 1, 2, 6-Thiadiazines, Sulfanuric Chloride 
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 TEI-XML for    default:Reihe_B/53/ZNB-1998-53b-0532.pdf 
 Identifier    ZNB-1998-53b-0532 
 Volume    53 
34Author    U. D. Rutkow Ski, P. StrauchRequires cookie*
 Title    Oxidative S-S-Kopplung von 1,2-Dithiooxalat durch intramolekulare Redoxreaktion der Selen(II)-und Tellur(II)-Komplexe O xidative S-S C oupling o f 1,2-D ithiooxalate by Intramolecular R edox Reaction o f the Selenium (II) and Tellurium (II) C om plexes  
 Abstract    The reaction of sodium monochalcogenopentathionates, Na2[Y(S20 3)2] (Y = Se, Te) with potassiumdithiooxalate in a water/methanol solution in presence of large cations (e. g. Ph4P+, Ph4As+ or BzlPh3P+) yields complexes of the type [Y(dto)2]2~ (Y = Se, Te). These complexes are of limited stability and undergo a redox reaction in solution. As the main product of this redox process the 3,4-dithiahexane-2,5-dione-l,6-di(thiocarboxylate) was isolated and characterized by X-ray structure analysis as the benzyltriphenylphosphonium salt (monoclinic space group P2^/c, Z = 2, a = 8.899(5) A, b = 16.458(2) Ä, c = 16.034(6) A and ß = 98.02(2)°). With Te_+ (Y = Te) as the coordination center we have been able to isolate the intermediate complex (Ph4P)2[Te(dto)2], 
  Reference    (Z. Naturforsch. 54b, 73—76 [1999]; eingegangen am 13. August 1998) 
  Published    1999 
  Keywords    1, 2-Dithiooxalate, X-Ray Data, Disulfide 
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 TEI-XML for    default:Reihe_B/54/ZNB-1999-54b-0073.pdf 
 Identifier    ZNB-1999-54b-0073 
 Volume    54 
35Author    Bettina Eichhorn, Heinrich NöthRequires cookie*
 Title    New Diazasilaphosphetidines and their Precursors  
 Abstract    A series of aminosilanes (R 'H N bSiR : have been prepared. In case of bulky substituents R' the aminolysis of Ph^SiCb stops at the (R'HN)ClSiPh2 stage. Replacement of the Cl atom is achieved with LiNHR' which allows the synthesis o f mixed bisaminosilanes (R'HN)(R"HN)SiPh2. The X-ray structures of three of these compounds have been determined. There are no intermolecular N-H -N hydrogen bonds in these compounds in the solid state. Several 1,3,2,4-diazaphosphetidines have been synthesized using bis(N-lithioamino)silanes and bis(N-lithioamino)phosphanes . Amongst these the heterocycle 18 possesses an almost planar four membered N iSiP ring system. 
  Reference    Z. Naturforsch. 55b, 352—360 (2000); received January 18 2000 
  Published    2000 
  Keywords    Bis(monoorganylamino)diorganylsilanes, 1, 3, 2, 4-Diazasilaphosphetinides 
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 TEI-XML for    default:Reihe_B/55/ZNB-2000-55b-0352.pdf 
 Identifier    ZNB-2000-55b-0352 
 Volume    55 
36Author    ProfG. Dr, MlostonRequires cookie*
 Title    Metallkomplexe  
 Abstract    mit funktionalisierten Schwefelliganden, XV [1]. Reaktionen von Platin(0)-Komplexen mit 1,2,4-Trithiolanen, 1,2,4,5-Tetrathianen, 1,2,3,5,6-Pentathiepanen sowie Thioketonen. Kristallstrukturanalyse von (Ph3P)2Pt(772-Ph2C=S) M etal Com plexes o f Functionalized Sulfur C ontaining Ligands, XV [1]. Reactions of Platinum(O) Com plexes w ith 1,2,4-Trithiolanes, 1,2,4,5-Tetrathianes, 1,2,3,5,6-Penta-thiepanes as well as Thioketones. X -R ay Structure A nalysis o f (Ph3P)2Pt(/72-Ph2C=S) W olfgang W eigand2, R alf W ünsch3, C hristian R obl3, Grzegorz M lostonb, Heinrich N öthc und M anfred Schm idt0 3,3,5,5-Tetraphenyl-1,2,4-trithiolane (1) reacts with twofold excess of (Ph3P)2Pt(?/2-C2H4) (4) to give a 1:1 mixture of the complexes (Ph3P)2Pt (SCPh2S) (6a) and (Ph3P)2Pt(?/2-Ph2C=S) (7a). Treatment of 3,3,6,6-tetraphenyl-l,2,4,5-tetrathiane (2) with a fourfold excess of 4 yields [Pt2(PPh3)4(/j-S)2] (8) and the platinum(O) compound 7a. The reaction of the 1,2,3,5,6-pentathiepane 3 with a fourfold excess of 4 affords a 1:1:1 mixture of 8, the platinum(O) complex 7b and the bis-thiolato platinum(II) complex 6b. The thioketone complexes 7a-c were formed in smooth reactions of 4 with the thioketones 5a-c. The molecular structure of (Ph3P)2Pt(?/2-Ph2C=S) (7a) has been established by single-crystal X-ray analysis. 
  Reference    Z. Naturforsch. 55b, 453—458 (2000); eingegangen am 28. Februar 2000 
  Published    2000 
  Keywords    1, 2, 4-Trithiolanes, Thioketones, Platinum Complexes 
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 TEI-XML for    default:Reihe_B/55/ZNB-2000-55b-0453.pdf 
 Identifier    ZNB-2000-55b-0453 
 Volume    55 
37Author    Florian Breitsameter, Peter Mayer, Alfred SchmidpeterRequires cookie*
 Title    Die Kondensation von Ylidylchlorphosphanen mit Phosphanen und Bis(diphenylphosphanyl)methan und -amin The Condensation o f Ylidyl Chlorophosphines with Phosphines and Bis(diphenylphosphino)methane and -amine  
 Abstract    Ylidyl chlorophosphanes 1 and dichlorophosphanes 2 react with trimethylsilyl phosphanes to yield the ylidyl diphosphanes 3, 4,5, 7 and the 2-ylidyl triphosphanes 8. From the reaction of compounds 1 with lithium diphosphanyl amide and diphosphanyl methanide result the ylidyl diphosphonium ylides 11 and ylidyl diphosphinimines 13. The former rearrange to give the ylidyl triphosphanyl methanes 12. The chloromethyl diphosphinimine 13c enters a cyclization to give the 1,2,3,5-azatriphosphole derivative 14, the structure of which has been solved by X-ray analysis. From the reaction of ylidyl bis(chlorophosphanes) 17 and 20 with the same reagents the 1,2,4,5-tetraphosphinine derivative 18 and the 1,2,3,5,6-azatetraphosphinine derivatives 19 and 21 are obtained. 
  Reference    Z. Naturforsch. 55b, 519—526 (2000); eingegangen am 21. Februar 2000 
  Published    2000 
  Keywords    Phosphonium Ylides, Diphosphanes, 1, 2, 3, 5-Azatriphospholes 
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 TEI-XML for    default:Reihe_B/55/ZNB-2000-55b-0519.pdf 
 Identifier    ZNB-2000-55b-0519 
 Volume    55 
38Author    M.S S A A Haw AliRequires cookie*
 Title     
 Abstract    The synthesis and antimicrobial activity of a series of the title thiones were examined. Reaction of such thiones with hydrazonoyl halides, resulted in ring transformation to give 5-acylhydrazono derivatives of 1,3,4-thiadiazoles. The mechanisms of the studied reactions are discussed. 
  Reference    Z. Naturforsch. 55b, 546—552 (2000); received February 4. 2000 
  Published    2000 
  Keywords    Ring-Chain Tautomerism Heterocyclic Ring Transformation, 1, 3, 4-Thiadiazoles 
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 TEI-XML for    default:Reihe_B/55/ZNB-2000-55b-0546.pdf 
 Identifier    ZNB-2000-55b-0546 
 Volume    55 
39Author    Max Herberhold3, Yan-Xiang Chenga, Guo-Xin Jinb, Wolfgang Milius3Requires cookie*
 Title     
 Abstract    ,r-Di(terf-butyl)metallocenium Cations. The X-Ray Crystal Structures of [M(C5H4'Bu)2]PF6 (M = Fe, Co) and [ C o ^ H / B u ^ C o C ^ The hexafluorophosphate salts [Fe(C5H4'Bu)2]PF6 (1) and [C o ^H /B u ^lP F ö (2) crystal­ lize in isotypic structures with centrosymmetric cations which have a staggered (transoid) conformation of the exactly parallel ring ligands (conformational angle r = 180°). The 
  Reference    Z. Naturforsch. 55b, 814—820 (2000); received May 26 2000 
  Published    2000 
  Keywords    1, 1 '-Disubstituted Ferrocenes, Ferrocenium Cations, Cobaltocenium Salts 
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 TEI-XML for    default:Reihe_B/55/ZNB-2000-55b-0814.pdf 
 Identifier    ZNB-2000-55b-0814 
 Volume    55 
40Author    Jörg Fleischhauer3, Sven Gabriel3, Dieter Enders3, Anja Nühring3, Axel WollmerbRequires cookie*
 Title    CD-Spectroscopic Investigations for the Determination of the Absolute Configuration of a-Alkylated 1,4-CycIohexanedione Derivatives  
 Abstract    The absolute configuration of the conformationally flexible six membered ring system 2-me-thyl-and 2,6-dimethyl-l,4-cyclohexanedione monoethylene acetal was determined by compar­ ison of measured and calculated CD spectra. The rotational strengths were calculated by means of the CNDO/S-method assuming R at the stereogenic center. The results were compared with the predictions made by the octant rule. The enantiomerically pure material was synthesized via the corresponding SAMP-and RAMP-hydrazones. 
  Reference    Z. Naturforsch. 55b, 1011—1014 (2000); received July 3 2000 
  Published    2000 
  Keywords    1, 4-Cyclohexanedione Derivatives, Absolute Configuration, CD Spectra 
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 TEI-XML for    default:Reihe_B/55/ZNB-2000-55b-1011.pdf 
 Identifier    ZNB-2000-55b-1011 
 Volume    55 
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