bluuebunny/crossref_metadata_2025_split huggingface dataset:
Vergleichende Untersuchungen zur Photosynthese und Atmung der Blätter von Schwefelmangelpflanzen
Authors: Willenbrink Johannes 
Published: February 2015

In the course of our investigations on sulfur metabolism in higher plants possible changes of photosynthesis and respiration induced by sulfur deficiency have been studied. Leaves of S-deficient and normal tomato plants were illuminated in the presence of 14CO2 for various times. After subsequent lyophilization, chloroplasts were isolated using a non-aqueous procedure which prevents leaching of hydrophilic substances out of the plastids. The time course of distribution of phosphoglycerate, sugar mono- and -diphosphates, and of malate between chloroplasts and the cytoplasm was calculated from the 14C-incorporation into the fractions obtained.
Neither a significant difference in the 14C-fixation rate nor remarkable changes of sites of synthesis and of transport of photosynthetic products between chloroplasts and cytoplasm could be observed between normal and S-deficient leaves. However, in S-deficient leaves the percentage of the sugar monophosphates is higher than normal even after 7 min photosynthesis, the 14C-activity in starch is twice as high as in normal leaves, whereas sucrose was labelled only weakly.
The respiration rate measured manometrically, is on a unit leaf area basis, similar to that of normal leaves; protein is not useful as a reference figure owing to the reduced protein content of the deficient leaves. Infiltration of discs of leaves with 14C-sucrose and subsequent measurement of the various 14C-labelled metabolites resulted in a strongly reduced labelling of citrate, malate, aspartate, and glutamate as compared with normal leave cells. Alanine was found to be more radioactive.
Since in addition citrate was less radioactive after 4 min dark fixation of 14CO2 we suggest from our results that the citrate cycle may be inhibited directly or indirectly by S-deficiency and that direct oxidation may dominate in the degradation of glucose in the S-deficient leaf cell.
N.N' -Dimethylacetamidinderivate des Aluminiums, Galliums und Indiums / N,N'-Dimethylacetamidin Derivatives of Aluminium, Gallium and Indium
Authors: Gerstner Franz , Weidlein Johann 
Published: February 2015

Abstract
The interaction of N,N'-dimethylacetamidine with trialkyl derivatives of aluminium, gallium and indium yields dialkylmetal compounds of the structural formula R2M(N2Me2CMe) (M = Al, Ga and In). According to the vibrational data the M2N4C2 skeletons of these dimeric products form a centrosymmetric puckered eight-membered ring, probably with C2h symmetry. The IR-and Raman spectra of the amidine HN(Me)C(= NMe)Me are discussed.
Kinetics of the Alkaline Solvolysis of Trichloroacetate Ion in Water-Ethanol Solutions
Authors: Issa I. M. , Diefallah E . M. , Mahmoud M. R. , El-Nady A. M. 
Published: February 2015

Abstract
Alkaline Solvolysis, Trichloroacetate Ion The alkaline solvolysis of trichloroacetic acid in water-ethanol mixtures have been studied in the presence of 0.40-0.80 M sodium hydroxide within the temperature range 35-70 °C. The rate constant increased with progressive addition of the organic solvent. The dielectric constant effect on the reaction rate was investigated. The radius of the activated complex at different temperatures was calculated. The isocomposition and isodielectric energies as well as the thermodynamic parameters of activation were calculated and their significance in terms of solvent composition has been discussed. It was concluded that the reactant state is extensively higher solvated than the transition state by the highly polar (water) solvent.
Dibrom(dimethylamino)alan und Diiod(dimethylamino)alan. Darstellung und Kristallstruktur / Dibromo(dimethylamino)alane and Diiodo(dimethylamino)alane. Preparation and Crystal Structure
Authors: Ahmed Aftabuddin , Schwarz Wolfgang , Hess Heinz 
Published: February 2015

Abstract
The title compounds were prepared by reaction of dimethylaminoalane with mercury - (II) dibromide and diiodide, respectively, and investigated by X-ray diffraction. Both compounds build structures isotype with that of dichloro(dimethylamino)alane. The molecules exist as dimers with a planar four-membered ring of alternating aluminium and nitrogen atoms. These atoms are four-coordinated. The following bond lengths are found: Al-N 1.94 and 1.95 Å, Al-Br 2.26 Å, Al-I 2.49 Å, N-C 1.50 and 1.55 Å.
Formation of Copper(II) Complexes of 1,3-Diamino-2-propanol in Aqueous Solution
Authors: Lajunen Lauri H.J. , Kivekäs Raikko 
Published: February 2015

Abstract
The complex formation between Cu2+ ions and 1,3-diamino-2-propanol has been studied potentiometrically at 25 °C, constant ionic strength equal to 0.1 M NaClO4, and pH 5-11. The nature of the complexes has been established by examining the standard deviations and values of the agreement index R of different models.
Reactions with Heterocyclic Diazonium Salts, II Synthesis of Some New Pyrazolo[1,5-c]-as-triazines and 1,2,4-Triazolo[1,5-c] -as-triazines
Authors: Elnagdi Mohamed Hilmy , Hamza Elmoghayar Mohamed Rifaat , Fahmy Shereif Mahmoud , Ibraheim Mohamed Kamal Ahmed , Alnima Hikmat Hussein 
Published: February 2015

3-Phenylpyrazole-5-diazonium chloride (2) couples with benzoylacetonitrile and with phenacylthiocyanate to yield the corresponding hydrazone derivatives 3 a, b. Whereas 3 a cyclised into the pyrazolo[1,5-c]-as-triazine derivative (4a) upon treatment with concentrated sulphuric acid via elimination of water, treatment of 3 b with the same reagent under the same conditions has resulted in elimination of thiocyanic acid and the formation of the pyrazolo[1,5-c]-as-triazine derivative (4b).
Treatment of 2 with aqueous sodium acetate has afforded the corresponding 3-phenyl-5-diazopyrazole (6). The latter reacted readily with dipolarophiles to yield pyrazolo- [1,5-c]-as-triazine derivatives. Pyrazolo[1,5-c]-as-triazines has also been formed upon treatment of 6 with active methylene compounds. The mechanism of reaction of 2 and 6 with active methylene compounds is discussed.
Diazotization of 5-amino-3-ethyl-1,2,4-triazole nitrate (7) has afforded the corresponding diazonium derivative which coupled with benzoylacetonitrile and with acetoacetanilide to yield the corresponding hydrazones 9 a, b. The latter could be cyclised into 1,2,4-triazolo[1,5-c]-as-triazines by the action of concentrated sulphuric acid
Chemilumineszenz der SO2-Oxidation / Chemiluminescence of SO2-Oxidation
Authors: Stauff Joachim , Jaeschke Wolfgang 
Published: February 2015

Abstract
The reactions of diluted aqueous solutions of SO2 resp. HSO3-ions with MnO4-or Ce4+ ions in the pH range 1-4 produce chemiluminescence in the spectral region of 450-600 nm. Measurements of the time course of the light emission and their simulation on an analog computer led to a reaction scheme in which a recombination product of primarily formed HSO3 radicals -of a lifetime of about 1 second -appears as precursor of electronically excited SO2 molecules. The participation of singlet oxygen can be excluded because at least the reaction with Ce4+ ions proceeds also in the absence of oxygen.
Cyclische Oxyphosphorane mit dem Spinlabel 4-Oxy-1-oxyl-2.2.6.6-tetramethylpiperidin / Spin-Labeled Cyclic Oxyphosphoranes 4-Oxy-1-oxyl-2,2,6,6-tetramethylpiperidine
Authors: Storzer Werner , Röschenthaler Gerd-Volker 
Published: February 2015

Abstract
Several spin-labeled oxyphosphoranes have been prepared by oxydative addition of biacetyl and hexafluoroacetone to phosphites containing the 4-oxy-1-oxyl-2,2,6,6-tetra-methylpiperidine group. The new compounds have been characterised by ESR and 31P NMR spectroscopy as well as by mass spectra.
Zur Synthese seitenkettenhydroxylierter Tetrahydrocannabinol / Synthesis of Side Chain Hydroxylated Tetrahydrocannabinols
Authors: Lötz Friedhelm , Kraatz Udo , Körte Friedhelm 
Published: February 2015

Abstract
The potential ⊿8 -tetrahydrocannabinol meta-bolites (6a, b) were synthesized starting from (+)-trans-p-menthadien-(2,8)ol(1) (2) and the resorcyl-alkyl esters (3a, b).
AB2X2-Verbindungen im CaAl2Si2-Typ, IV [1] Zur Struktur der Verbindungen CaZn2Sb2, CaCd2Sb2, SrZn2Sb2 und SrCd2Sb2 / AB2X2 Compounds with the CaAl2Si2 Structure, IV [1J The Crystal Structure of CaZn2Sb2, CaCd2Sb2, SrZn2Sb2, and SrCd2Sb2
Authors: Mewis Albrecht 
Published: February 2015

Abstract
The four ternary compounds CaZn2Sb2, CaCd2Sb2, SrZn2Sb2, and SrCd2Sb2 have been prepared and investigated by X-ray methods. They are isotypic and crystallize trigonally in a CaAl2Si2-type structure (space group P3̅m 1-D3
3d) with the following constants:
CaZn2Sb2 a = 4.441 ± 0.001 Å, c = 7.464 ± 0.002 Å;
CaCd2Sb2 a = 4.649 ± 0.001 Å, c = 7.597 ± 0.002 Å;
SrZn2Sb2 a = 4.500 ± 0.001 Å, c = 7,716 ± 0.002 Å;
SrCd2Sb2 a = 4.709 ± 0.001 Å, c = 7.822 ± 0.003 Å.
Organoborierung von Alkinylstannanen, VI [1] Allenbildung bei einer Deorganoborierung / Organoboration of Alkynylstannanes, VI [1] Formation of an Allene by Deorganoboration
Authors: Wrackmeyer Bernd 
Published: February 2015

Abstract
The thermal decomposition of some 1,1-bis(trimethylstannyl)-2-dialkylborylalkenes leads unexpectedly to substituted allenes. The structural information is based on 1H, 11B, 13C and 119Sn NMR data and also on the strong IR band at 1882 cm-1.
Reaktionen von Phosphoryliden mit Übergangsmetall-Verbindungen, V [1] / 1-Diphenylphosphinyl-AlkyMentriphenylphosphoran-carbonyl-chrom- und -eisen-Komplexe / Reactions of Phosphorus Ylides with Transition Metal Compounds, V [1] 1-Diphenylphosphinyl Alkylidenetriphenylphosphorane Carbonyl Chrom and Iron Complexes
Authors: Knoll Lothar 
Published: February 2015

Abstract
The synthesis of new ylide complexes is reported. They are synthesized by the reaction of (CO)5CrP(C6H5)2Cl and (CO)4FeP(C6H5)2Cl with phosphorus ylides (C6H5)3P = CHR (R = CH3, H) and characterized by their IR, 1H NMR and 31P NMR spectra.
1.3-Diondioxime und ihre Metall(II)-Komplexe mit den Ionen Nickel(II), Palladium(II) und Platin(II) / 1,3-Dionedioximes and their Metal(II) Complexes with Ions Niekel(II), Palladium(II) and Platinum(II)
Authors: Gottstein N. , Keller H. J. 
Published: February 2015

Several alkyl and aryl substituted 1,3-dionedioximes, like acetylacetonedioxime, have been reacted with nickel(II), palladium(II) and platinum(II) in aqueous or alcoholic solution. Two kinds of complexes were obtained:
(i) those with stoichiometry metal: ligand = 1 : 1 and
(ii) bis(l,3-dionedioximato)metal(II) complexes.
None of the isolated solid compounds showed any sign of appreciable intermolecular metal metal interactions. An attempt to enhance intermolecular interaction by oxidizing the compounds with iodine lead to the destruction of all of the complexes.
Synthesis and Some Reactions of Naphthoylacetanilides
Authors: Ali M. I. , El-Morsy M. M. S. , Hassan N. M. , Sharaf M. 
Published: February 2015

Abstract
The structure of some naphthoylacetanilides (1) obtained from a new route of synthesis is elucidated via inspection of IR, NMR, and mass spectral data. Napthoylacetanilides condensed with one or two moles of aromatic aldehyde to give 2-(naphthoyl)-cinnamanili-des (2) or 3-aryl-2,2′-dinaphthoyl-glutaric acid dianilides (3). Compound 2b added phenylmercaptan to give 3-phenyl 3-phenylthio-2-naphthoyl-propananilide (4). Reduction of 2b gave 2-benzyl 2-(2-naphthoyl)acetanilide (5). 1 is coupled with aryldiazonium salt to give 2-oxo naphthoylacetanilides-2-arylhydrazones (6). The mechanism of the reactions is discussed.
Nachbargruppeneffekte bei der Aminolyse von Estern, II Die Aminolyse von 2-(2-Hydroxybenzyl)phenylacetaten / Neighboring Group Effects in the Aminolysis of Esters, II The Aminolysis of 2-(2-Hydroxybenzyl)phenylacetates
Authors: Böhmer Volker , Wörsdörfer Klaus 
Published: February 2015

Abstract
The aminolysis of 2-(2-hydroxybenzyl)phenyl acetates with n-butylamine in dioxane is much faster than for the corresponding 2-(2-methoxybenzyl)phenyl acetates or 2-methyl-phenyl acetates. The kinetic results can be explained by two equivalent mechanisms. Both of them include the formation of a 1:1-complex between 2-(2-hydroxybenzyl)phenyl acetate and n-butylamine which is formed in an equilibrium. The reaction of this complex according to a second order rate law seems to be more probable than the reaction of the free ester according to a third order rate law.
Wolfram-Carbonylkomplexe mit Stickstoff-Wasserstoff-Liganden [1] / Tungsten Carbonyl Complexes with Nitrogen Hydride Ligands [1]
Authors: Sellmann Dieter , Brandl Alfred , Endeil Ralf 
Published: February 2015

Abstract
Synthesis, properties and reactions of [(OC)5W]2N2H2, [(OC)5W]2N2H4, (OC)5WN2H4, (OC)5WNH3, [(OC)4PØ3W]2N2H4, [(OC)4PØ3WN2H4], [(OC)5W-N2H2-W(CO)4PØ3], [(OC)5W-N2H2-W(CO)4P(CH3)3] and [(OC)5WNHCH3NHC6H5] are reported. The hydrazine complexes are synthesized by ligand exchange from the corresponding tetra-hydrofuran complexes. Oxidation by various oxidizing agents yields the diazene complexes, in most cases very low yields. Substitution of CO by phosphanes leads to reduced stability of the compounds. All complexes undergo base catalysed H-D exchange yielding the corresponding ND derivatives; the diazene complexes show a much faster exchange than the corresponding hydrazine and ammonia complexes, which is explained by the higher acidity of the N2H2 protons. The diazene complexes disproportionate under base catalysis to hydrazine and dinitrogen compounds, the latter of which loose the N2 ligand immediately. The diazene ligand of [(OC)5W]2N2H2 cannot be alkylated by reactions with (CH3)2SO4, LiCH3 or CH2N2; instead, LiCH3 as well as CH2N2 cause disproportionation to N2H4 and N2 complexes. UV irradiation of [(OC)5W]2N2H2 in THF leads to substitution of CO by THF. The THF complexes can be converted to the phosphane substituted diazene complexes. The IR, UV-VIS and 1H NMR spectra of the (OC)5W complexes are nearly identical to those of the analogous Cr and Mo compounds. The unsymmetrical phosphane diazene complexes, however, show a quartet of the N2H2 protons in the 1H NMR spectra with coupling constants of 25-26 Hz for the protons on the NN double bond. This value points to a trans configuration of the diazene ligand and its complexes respectively.
Benzo-benzothiopyranoquinoline Derivatives of Possible Antiparasitic Activity
Authors: Zayed A. , Metri J. 
Published: February 2015

Abstract
For possible antiparasitic activity, benzo-benzothiopyranoquinoline-6-malonaldehyde was synthesized and condensed with hydrazine hydrate, Phenylhydrazine and/or 0-phenylenediamine. This afforded pyrazole, phenylpyrazole and diazepin derivatives respectively.
Structural Effects on Nitrile Infrared Integrated Intensities of Alpha,Beta-Diaryl Cyanoethylenes: Hammett and Quantum Chemical Approaches
Authors: Juchnovski Ivan , Kuzmanova Rositza , Tsenov Jordan , Kaneti José , Binev Ivan 
Published: February 2015

Abstract
The nitrile infrared intensities of a series of a,β-diaryl cyanoethylenes were juxtaposed to the associated substituent constants, HMO and SCF-MO indices and fair to excellent correlations were established. The competitive resonance of the nitrile group with alpha-and beta-aryl substituents is discussed. HMO calculations were used to estimate the steric hindrance to conjugation caused by polycyclic substituents and SCF-MO calculations were made to obtain uniform predictions of nitrile intensities and frequencies for hetero-cyclic derivatives of acrylonitrile.
Über Cyanatomercurate M2Hg3(NCO)8 (M = K, Rb, Cs) - Synthesen, Kristallstrukturen und Schwingungsspektren / On Cyanatomercurates M2Hg3(NCO)8 (M = K, Rb, Cs) - Syntheses, Crystal Structures and Vibrational Spectra
Authors: Thiele Gerhard , Hilfrich Peter 
Published: February 2015

Abstract
By mixing aqueous solutions of Hg(CH3COO)2 and MOCN (M = K, Rb, Cs) the tri-clinic compounds M2Hg3(NCO)8 are formed. In a first approximation the crystal structure analysis indicates isolated Hg(NCO)2 molecules besides K+ and NCO- ions. As in the range of van der Waals radii additional NCO-neighbours are noticed the mercury atoms are surrounded by distorted octahedra. The octahedra around 2/3 of the Hg form infinite chains as in KHg(NCO)3 which are linked together by additional Hg(NCO)2 molecules. Therefore the compound can be formulated as a double salt 2 KHg(NCO)3 • Hg(NCO)2. The vibrational spectrum is discussed. Rb2Hg3(NCO)8 is isotypous while the caesium salt has a double cell volume.
Semiempirische SCF-Rechnungen an den angeregten Zuständen von Hydroxy Cumarinen / Semiempirical SCF-Calculations of the Excited States of Hydroxycoumarines
Authors: Fabian Walter 
Published: February 2015

Abstract
Semiempirical SCF-calculations show that the fluorescence bands of 7-hydroxycoumarin at 1.87 · 104-1,92 · 104 cm-1 are most probably due to a phototautomeric form. A topological rule is evaluated to explain the dependence of the fluorescence intensity upon the position of the hydroxyl group in the various isomeric hydroxycoumarines
Die gas-chromatographische Untersuchung der bei der UV-Bestrahlung von Uracil und Thymin in Lösung und in der Eismatrix gebildeten Produkte / Gas-chromatographic Investigation of Products Formed by UV Irradiation of Uracil and Thymine in Solution and Ice Matrix
Authors: Fahr Egon , Roth Georg Ph. , Wüstenfeld Peter 
Published: February 2015

Abstract
By gas-chromatographic analysis of products prepared by UV irradiation of uracil in water, acetonitrile or ice matrix resp. of thymine in actonitrile could be demonstrated, that in all cases all four cyclobutane dimers are formed
Die Struktur des 2.3.4.6.7.8-Hexamethyl-2.3.4.6.7.8-hexaphosphabicyclo- [3.3.0] octans (PMe)6C2H2 / The Structure of 2,3,4,6,7,8-Hexamethyl-2,3,4,6,7,8-hexaphosphabicyclo[3,3,0]octane (PMe)6C2H2
Authors: Schnering Hans-Georg von , May Wolfgang 
Published: February 2015

Abstract
One of the diastereomeres of 2,3,4,6,7,8-hexamethyl-2,3,4,6,7,8-hexaphosphabicyclo-[3,3,0]octane (PMe)6C2H2 crystallizes in the space group P21/n with four molecules per unit cell. Two independent molecules are nearly identical in shape but differ by inter-molecular packing. The five-membered rings have a skew chair conformation with all exocyclic methyl groups in axial positions leading to a staggered all-trans conformation of the bicyclic system. The mean bond lengths are P-P = 220.9 pm, P-C = 185.9 pm and C-C = 151.9 pm.
Zur Kristallstruktur von Sr6(CrO4)3Cl / On the Crystal Structure of Sr5(CrO4)3Cl
Authors: Müller-Buschbaum Hk. , Sander K. 
Published: February 2015

Abstract
Single crystal X-ray investigation shows that Sr5(CrO4)3Cl is not isotypic with the apatite structure as being affirmed up to now. Chlorine occupies a position other than z = 0.250 implying the lower symmetry C6
6-P 63.
As a consequence one strontium coordination sphere changes from octahedral to trigonal prismatic.
Kristallisationsvorgänge bei melallreichen Rubidiumoxiden / Crystallisation Processes in Metal Rich Rubidium Oxides
Authors: Deiseroth H. J. , Simon A. 
Published: February 2015

Abstract
On the basis of X-ray investigations a structural model for the orientational disorder of Rb9O2 clusters in the rubidium suboxide Rb6O is derived, which is in accordance with details of the thermal analysis of the ordering process.
In the second part the thermal and structural investigations of a metastable phase of the probable composition Rb6,33O are described. The phase is formed by warming quenched samples RbxO (9 >x > 7) to co. 140 K and decomposes at ca. 183 K. Its cubic structure bears relationships to the structure of rubidium as well as to YB66 (replacing B12 icosahedra in the latter compound by Rb atoms).
A special DTA instrument used for the investigation of Rb6,33O is described.
Montanin-C, A New Furanoid Diterpene from Teucrium montanum L
Authors: Malakov Peter Y. , Papanov Georgi Y. , Mollov Nikola M. , Spassov Stefan L. 
Published: February 2015

Abstract
A new furanoid diterpene of clerodane type, Montanin-C (1) is isolated from the bitter fraction of the arial parts of Teucrium montanum L., spread in Bulgaria. Its structure is established on the basis of spectral evidance and chemical transformations.
Untersuchung von isomeren Tripeptiden und Derivaten des Thyrotropin-,Releasing" Hormons durch Elektronenstoß- und Felddesorptions-Massenspektrometrie / Investigation of Isomeric Tripeptides and Thyrotropin-Releasing Hormone Derivatives by Electron Impact and Field Desorption Mass Spectrometry
Authors: Lüderwald I. , Przybylski M. , Ringsdorf H. , Silberhorn D. , Kaibacher H. , Voelter W. 
Published: February 2015

Abstract
The complementary informations from field desorption and electron impact mass spectra of free tripeptides and thyrotropine releasing hormone derivatives can be used to determine primary structure and molecular weight. Characteristic and diagnostic fragmentation pathways, the formation of diketopiperazines and the temperature-dependent tendency to form amine fragments and diketopiperazines will be discussed.
Crystal and Molecular Structure of a New Linear Chain Compound: Bis(diphenylglyoximato)platinum(III)perchlorate
Authors: Endres H. , Keller H. J. , Sand H. van de , Dong Vu 
Published: February 2015

Abstract
The reaction of bis(diphenylglyoximato)platinum(IV) diiodide with AgClO4 in benzene yields red brown needles of the compound bis(diphenylglyoximato)platinum(III) perchlorate (A) and crystals of bis(diphenylglyoximato)platinum(III) perchlorate which contains additionally between one and one and a half moles of benzene per formula unit (B). Both compounds are highly hygroscopic and instantaneously change their color to black-green in a humid atmosphere. Crystals of A are tetragonal, a = 20.325(2), c - 6.519(4) Å, space group D8
4h-P4/ncc, Z = 4. The structure consists of stacks of [Pt(dpg)2]+ cations with equidistant Pt-Pt separations of 3.259(4) Å. The Perchlorate ions are disordered in channels formed by the cation columns. Crystals of B are triclinic, a = 14.29(3), b = 13.54(2), c -10.34(3) Å, a = 85.2(2), β = 113.2(2), γ = 93.9(2)°.
Groups Übergangsmetall-substituierte VB-Elementsysteme, 12 [1] Ein- und zweikernige Übergangsmetallkomplexe mit Dihalogenarseneinheiten / Transition Metal Substituted VB Element Systems, 12 [1] Mono-and Dinuclear Transition Metal Complexes with Dihalogenarsenic
Authors: Malisch Wolfgang , Panster Peter , Alsmann Robert 
Published: February 2015

The reaction of ASCl3 with the transition metal anions [η5-C5H5(CO)3M]⊖ (M = Cr, Mo, W) yields the arsenic transition metal complexes η5-C5H5(CO)3M-AsCl2, which readily form trans-η5-C5H5(CO)2LM-AsCl2 in the presence of phosphorus donors [L = P(OCH3)3, P(CH3)2C6H5].
Addition of M(CO)5-groups on the trivalent arsenic occurs with THF · M′(CO)5 (M′ = Cr, Mo) leading to the arsenic bridged dinuclear complexes η5-C5H5(CO)3Cr-AsCl2-M′(CO)5. Controlled Cl/F-exchange at the bridged species can be achieved by use of AgBF4.
Ein Beitrag zur Zusammensetzung des Insektizides "Toxaphen®" Gaschromatographisch-massenspektroskopische Charakterisierung eines öligen und eines kristallinen Anteils des technischen Toxaphens und dessen insektizide Wirksamkeit / A Contribution to the Composition of the Insecticide "Toxaphene®" Gaschromatographic-Masspectroscopical Characterisation of the Oily and the Crystalline Fraction of Technical Toxaphene and their Insecticidal Activity
Authors: Parlar H. , Nitz S. , Michna A. , Körte F. 
Published: February 2015

Abstract
Technical Toxaphene can be separated in two fractions by recrystallisation which are investigated with the help of GC/MS and toxicological methods. Especially the Retro-Diels-Alder-fragmentations give specific informations on the structure of highly chlorinated bornane derivatives representing the main components of the technical mixture. For this study lower chlorinated bornanes are used as model substances. Toxicological investigations show that both fractions have lower activity than technical toxaphene.