bluuebunny/crossref_metadata_2025_split huggingface dataset:
Darstellung und Kristallstruktur von CaRh2B2 und CaIr2B2 / Preparation and Crystal Structure of CaRh2B2 und CaIr2B2
Authors: Schmidt Bernd , Jung Walter 
Published: February 2015

The isotypic compounds CaRh2B2 and CaIr2B2 were prepared and investigated by X-ray methods. They crystallize orthorhombic in space group Fddd-D2h
24 with lattice constants
CaRh2B2: a = 1060.6 ± 0.4 pm,
b = 924.0 ± 0.4 pm,
c = 583.2 ± 0.2 pm.
CaIr2B2: a = 1072.7 ± 0.4 pm,
b = 925.7 ± 0.4 pm,
c = 587.7 ± 0.2 pm.
The structure contains isolated boron-atoms and can be derived from the CeCo3B2- or CaCu5-type of structure, respectively.
Darstellung und Kristallstruktur von Li2In und Li13In3 / Preparation and Crystal Structure of Li2ln and Li13ln3
Authors: Stöhr Joachim , Müller Wiking , Schäfer Herbert 
Published: February 2015

Abstract
Li2In crystallizes isotypic with Li2Ga, space group Cmcm-D2a
17, a = 476.3(1), b = 1001.7(3) and c = 473.5(1) pm, the In-atoms build up zig-zag-chains. Li13In3 forms a new structure type, f.c.c., space group Fd 3m-Oh
7, a = 1355.6(2) pm; it can be described as an ordered variant of the b.c.c. package with isolated In-atoms.
Siliciumverbindungen mit starken intramolekularen sterischen Wechselwirkungen, VII [1]. Tri-tert-butylsiliciumpseudohalogenide / Silicon Compounds with Strong Intramolecular Steric Interactions, VII [1]. Tri-tert-butylsilicon Pseudohalides
Authors: Weidenbruch Manfred , Pesel Helge 
Published: February 2015

Abstract
Tri-tert-butylchlorosilane reacts with potassium pseudohalides in the presence of catalytic amounts of the crown ether 18-crown-6 to give the tri-tert-butylsilicon pseudo-halides (t-C4H9)3SiX (X = CN, NCO, NCS, N3) in good yields. These new compounds are characterized by IR, 1H NMR, and mass spectra. In the absence of the crown ether no reaction occurs. Treating tri-tert-butylsilane with AgX (X = CN, SCN) gives the silicon pseudohalides in low yields.
Fluorierung von Platin(IV)amminkomplexen in wäßriger Lösung / Fluorination of Ammine Complexes of Platinum(IV) in Aqueous Solution
Authors: Jander Jochen , Mayer Hans Otto 
Published: February 2015

Abstract
Unlike chlorination fluorination of ammine complexes of platinum(IV) in aqueous solution does not lead to haloamido complexes. Instead, the triammine complexes [Pt(NH3)3Cl3]Cl and [Pt(NH3)3(NCl2)2Cl]Cl yield no definite main product, and the tetrammine and pentammine complexes trans-[Pt(NH3)4Cl2]Cl2, [Pt(NH3)4(NCl2)Cl]Cl2, [Pt(NH3)5Cl]Cl3, and [Pt(NH3)5(OH)]Cl3 form the sparingly soluble complex trans -[Pt (NH3)4Cl2](H2F3)2 · 2H2O as the main product.
tert-Butylphosphin-Komplexe von Gold(I)-und Silber(I)-halogeniden/tert-Butylphosphine Complexes of Gold(I) and Silver(I) Halides
Authors: Schmidbaur Hubert , Aly Aref A. M. 
Published: February 2015

Abstract
From HAuCl4 and tri-tert-butyl phosphine in methanol the gold(I) complex [(CH3)3C]3P-Au-Cl (1) has been synthesized and converted into the bromide 2 and iodide 3, using KBr and KI, respectively, in acetone solvent. The corresponding P-Cl functional complexes [(CH3)3C]2PCl-AuCl (4) and (CH3)3CPCl2 - AuCl (5) could be obtained from (carbonyl)gold chloride ClAu(CO) and the chlorophosphine in benzene, with evolution of CO.
The di-tert-butyl-phosphine analog, [(CH3)3C]2PH - AuCl (7) results from a lowtemperature reduction of HAuCl4 with this phosphine. All these gold(I) complexes are soluble in many solvents as monomers. The corresponding silver compounds, prepared from [(CH3)3C]3P and AgCl, Br, I in an inert solvent, appear to be oligomers, however, and showed dimer or tetramer association in halocarbon or benzene solvent. Infrared and 1H, 13C, 31P NMR spectra have been used for further characterization of the compounds.
Solvent Extraction Study of Nickel(II) and Cobalt(II) with I-Phenyl-3-methyl-4-benzoylpyrazol-5-one (PMBP-OH)
Authors: Patel A. N. , Qureshi A. M. 
Published: February 2015

Abstract
The extraction of nickel(II) from aqueous hydrochloric acid solution by I-phenyl -3-methyl-4-benzoylpyrazol-5-one (PMBP·OH) dissolved in carbon tetrachloride has been studied. The extraction of nickel(II) from the aqueous solution in the range of 1.0-5.0 M hydrogen ion concentration has been found to be much higher compared to that of cobalt(II). The extraction of nickel with PMBPOH is simple, fast and selective. The composition of the extracted species in solution as well as in solid form have been studied. The IR bands for the reagent and the metal complexes are reported.
Cyclopentadienyl Titanium(IV) Complexes with Phenylisocyanate
Authors: Parashar G. K. , Bharara P. C. , Mehrotra R. C. 
Published: February 2015

Abstract
Complexes of the type
CpTi(OR)3-n[N(Ph)COOR]n where R = Et, Pri and But, n = 1, 2 or 3, have been synthesized by the reactions of cyclopentadienyl titanium trialkoxides with phenylisocyanate. All these complexes have been characterized by the elemental analysis and infrared spectra.
Beiträge zur Chemie des Bors, XCVII Eine Untersuchung des Substituentenaustausches zwischen Trithiadiborolanen / Contributions to the Chemistry of Boron, XCVII An Investigation of the Substituent Exchange between Trithiadiborolanes
Authors: Nöth Heinrich , Taeger Tilman 
Published: February 2015

Abstract
The substituent exchange between trithiadiborolanes has been studied by the 10B isotope technique. A simultaneous exchange of the substituent and the boron atom to which the substituent is bound was observed. This result is explained by a mechanism comprising a conformationally flexible ten membered ring as an intermediate. The exchange occurs not only between differently substituted trithiadiborolanes but also between trithiadiborolanes of one sort.
Reaktion des Orthovanadinsäure-tri-tert-butylesters mit Monocarbonsäuren / Reaction of Tris-tert-butylorthovanadate with Monocarboxylic Acids
Authors: Preuss Fritz , Woitschach Joachim 
Published: February 2015

Abstract
Tris-tert-butylorthovanadate VO(OC4H9)3 undergoes reaction with monocarboxylic acids to yield monomeric VO(OC4H9)(RCOO)2; no VO(OC4H9)2(RCOO) or VO(RCOO)3 could be isolated from the reaction mixture. Polymeric dioxovanadium(V)-monocarbox-ylates(VO2RCOO)n are formed by thermolysis or partial hydrolysis of VO(OC4H9)(RCOO)2; the reaction mechanism is studied and discussed. Syntheses of Ba[VO2(CH3COO)3], Ba[VO2(C2H5COO)3] and N(C4H9)4[V4O8Br(CH3COO)4] are described. All compounds obtained are characterized by IR and 1H NMR spectroscopy as well as by chemical reactions. The carboxyl groups are mostly acting as bidentate ligands.
RbSb3S5 · H2O, ein neuer Formel-und Strukturtyp bei Thioantimoniten / RbSb3S5 · H2O -a New Formula and Structure Type in the Group of Thioantimonites
Authors: Volk Klaus , Schäfer Herbert 
Published: February 2015

Abstract
RbSb3S5 · H2O has been prepared and its structure determined. The compound crystallizes triclinic, P1̄ with a = 1053.6(5) pm, b = 893.8(5) pm, c = 599.0(5) pm, α = 87.09(5)°, β = 100.33(5)° and γ = 102.39(5)°. SbS4-ψ-trigonal bipyramids and SbS3-ψ-tetrahedra are connected together to sheets separated by Rb-ions and water molecules.
Na3(AlSi)Te4 -das erste Hypotelluroalumosilikat / Na3(AlSi)Te4 -the First Hypotelluroalumosilicate
Authors: Weis Jürgen , Schäfer Herbert 
Published: February 2015

Abstract
Na3(AlSi)Te4 has been prepared and analytically characterized. The compound is monoclinic, C2/m, with a = 747 ± 1 pm, b = 434 ± 1 pm, c = 852 ± 1 pm, β = 107.4° ±0.1. The structure can be described as a variant of the a-NaFeO2-type. One half of the octahedral sites is occupied by Na ions while in the other half of these holes Na ions and Al-Si-dumbbells in the ratio 1:1 are randomly distributed.
Kohlenstoffe als Katalysatoren für die Oxydation von schwefliger Säure / Carbons as Catalysts for the Oxidation of Sulfurous Acid
Authors: Zuckmantel Michaela , Kurth R. , Boehm H. P. 
Published: February 2015

Abstract
Conductometric measurements of the catalytic oxydation of dilute aqueous sulfurous acid were used in the comparison of various carbon catalysts, e.g. active charcoals and carbon blacks. The oxidation rate is proportional to (Po2) 1/2 and to the amount of adsorbed HSO3- ions. Basic surface oxides are responsible for the HSO3 -adsorption. The catalytic activity of a carbon is influenced also by other factors than the concentration of basic surface oxides. It is changed by heat treatment of the carbon as well as by chemical treatment of its surface. Treatment with ammonia at 600 °C increases its activity dramatically, absolutely inactive carbon blacks were rendered highly active.
Azido-chelatkobalt(III)-Komplexe / Azido Chelate Cobalt(III) Complexes
Authors: Beck Wolfgang , Kemmerich Timm , Böhme Heiko 
Published: February 2015

Abstract
The preparation and characterization of a series of azido chelate complexes of cobalt(III), N3Co(chel)2B (chel = anionic bidentate ligand, B = base e.g. PPh3, P(OEt)3) and N3Co(chel′)B (chel′ = anionic tetradentate ligand) is reported. In addition, analogous chelate cobalt(III) complexes containing the pesudo halides NCO-, NCS -, CN -, C ≡ CR-, C(CN)3-, CH2NO2- have been prepared.
Ternary Complexes in Solution, XXX Increased Stability Through Intramolecular Stacking in Mixed-Ligand Cu 2+ and Zn 2+ Complexes of 2,2′ -Bipyridyl and Carboxymethyl Aryl Derivatives
Authors: Farkas Etelka , Fischer Beda E. , Griesser Rolf , Rheinberger Volker M. , Sigel Helmut 
Published: February 2015

Abstract
The stability constants of ternary Cu 2+ and Zn 2+ complexes, each of which contains 2,2′-bipyridyl and a carboxymethyl aryl sulfide, were determined in 50% aqueous dioxane. A comparison of the stability of these ternary complexes with those formed with simple carboxylates demonstrates an enhanced stability of the carboxymethyl aryl sulfide containing mixed ligand complexes. This enhanced stability is not due to a thioether-metal ion interaction, but due to an intramolecular aromatic stacking interaction between the aryl moiety of the carboxymethyl aryl sulfide and 2,2′-bipyridyl. Indeed, by UV difference spectra and by PMR measurements it is possible to show that a binary (metal ion-free) stacked adduct between the aromatic moieties of the two mentioned ligands is formed. Furthermore, by studying the binary and ternary systems of Zn 2+ or Cu 2+ , 2,2′-bipyridyl and hydrocinnamate, i.e. 3-phenylpropionate (-S-of carboxymethyl phenyl sulfide is replaced by -CH2-), it becomes obvious that the thioether moiety is not essential for the observation of an enhanced stability of the ternary complexes. PMR shift studies of 2,2′-bipyridyl/Zn 2+ /carboxymethyl aryl sulfide systems confirm the presence of stacking in the corresponding ternary complexes. Depending on the kind of the ternary metal ion complex the stability enhancement, due to the intramolecular stacking between the aromatic parts of the coordinated ligands, is between about 0.2 to 0.5 log unit.
Oxidation von Mercapto-Carbonyl-Mangankomplexen / Oxidation of Mercapto Carbonyl Manganese Complexes
Authors: Küllmer Volker , Röttinger Erika , Vahrenkamp Heinrich 
Published: February 2015

Abstract
Chemical oxidation of the mercapto carbonyl manganese complexes (Me3P)2(CO)3Mn-SX (1), (Me3P)2(CO)5Mn2(SX)2 (2), and (CO)8Mn2(SX)2 (3) (X = H, SnMe3) were investigated. From the SH complexes no identifiable products could be obtained. For X = SnMe3, the iodine oxidation of 2 yielded (Me3P)2(CO)5Mn2S2 (5), that of 3 gave (CO)15Mn4S4 (7), both containing bridging disulfide ligands. The crystal structure of 7 was determined.
Zur Darstellung und Kristallstruktur des SrZnSb2 / On the Preparation and Crystal Structure of SrZnSb2
Authors: Brechtel Erwin , Cordier Gerhard , Schäfer Herbert 
Published: February 2015

Abstract
SrZnSb2 has been prepared and characterized analytically and structurally. The compound crystallizes in the orthorhombic system with a = 2305 ± 5 pm, b = 437 ± 1 pm, c = 446 ± 1 pm, Pnma-D2h
16. Zn- and Sb-atoms form distorted fourfold pyramids, connected by common edges in the basis to two-dimensional sheets. These sheets are separated by double layers of Sr-atoms in which further Sb-atoms are located building four-cornered networks.
Ligandenfeldspektroskopische Untersuchungen an Übergangsmetall -Aluminium -Tetraalkoxiden / Ligand Field Spectroscopic Studies of Transition Metal Aluminium-Tetraalkoxides
Authors: Stumpp Eberhard , Hillebrand Uwe 
Published: February 2015

Abstract
The preparation and the electronic spectral properties of compounds M[Al(OR)4]2 (M = Co, Ni, Cu and R = CH3, C2H5, n-C3H7, n-C4H9) are described. The spectral data are used in conjunction with ligand field theory in deducing the structures of the compounds. The spectrum of green Ni[Al(OR)4]2 is interpreted as a Ni(OR)6 octahedron sharing faces with two Al(OR)4 tetrahedrons. It is proposed that Co 2+ and Cu 2+ are in a distorted octahedral coordination. The alkoxide ligands have been fitted into the spectrochemical and the nephelauxetic series. They are close to H2O in this series.
Semiempirische SCF-Rechnungen zur Hydroxypyridin-Pyridon-Tautomerie / Semiempirical SCF-Calculations on the Hydroxypyridine-Pyridone-Tautomerism
Authors: Fabian Walter 
Published: February 2015

Abstract
The electronic spectra of a series of substituted 4-hydroxypyridones are calculated by the CNDO/CI-method. Best agreement between observed and calculated transition energies is obtained when the geometry of the pyridone-form is assumed. In addition, MINDO/2-calculations predict the pyridone tautomer to be the more stable one in most cases.
The Delayed Luminescence of Tryptophan in Aqueous LiCl Solutions at 77 K
Authors: Yamashita Shozi , Tomita Giiti 
Published: February 2015

Abstract
The effect of LiCl on the delayed luminescence caused by the recombination of photo -ejected electrons with tryptophan cations in aqueous solutions was investigated at 77 K. The luminescence intensity strongly depended on LiCl concentration. At high LiCl concentrations, the intensity of the fast decay component of the recombination fluorescence decreased to a constant value, whereas that of the slow decay component inversely increased. The intensity of the recombination phosphorescence was weak and unchanged in low LiCl concentration range but increased steeply above 7 M LiCl. NO3̄, electron scavenger, quenched both the recombination fluorescence and phosphorescence, but the degree of the quenching decreased rapidly in the order of the fast decay component of the recombination fluorescence, the slow decay component of the recombination fluorescence, the recombination phosphorescence. Furthermore, the quenching efficiency of NO3̄ for each recombination luminescence was found to diminish with increasing LiCl concentration. The distribution of photo-ejected electrons to shallow-and deep-traps, dependent on LiCl concentration, was discussed from results obtained.
Über eine neue Präparationstechnik in der Feststoffchemie, I Hochtemperatursynthesen mit CO2-Laser / A New Preparation Technique in Solid State Chemistry, I High Temperature Reactions with CO2-Laser
Authors: Müller-Buschbaum Hk. , Pausch H. 
Published: February 2015

Abstract
A new high temperature method using a CO2-Laser radiation is reported. Its application on solid state reactions in air or in defined gas atmospheres is described.
Über die Darstellung und röntgenographische Untersuchung von Cu2SrGeS4 und Cu2BaGeS4 / On the Preparation and X-ray Investigation of Cu2SrGeS4 and Cu2BaGeS4
Authors: Teske Chr. L. 
Published: February 2015

Abstract
Single crystals of Cu2SrGeS4 and Cu2BaGeS4 were prepared by using molten bromides as solvents. The compounds crystallize isotypically to their homologous thiostannates(IV) [1, 2]. (Cu2SrGeS4: Space group P32, a = 614,3, b = 614,3 and c = 1528,2 pm; Cu2BaGeS4: Space group P31, a = 621,5, b - 621,5 and c = 1553,4 pm). The atomic parameters and interatomic distances are reported.
Tetraquecksilbermethane, II [1]Tetrakis(halogenoquecksilber)-methane C(HgX)4 (X = F, Cl, Br und I): Synthesen und Schwingungsspektren / Tetramercurimethanes, II [1]Tetrakis(halomercuri)methanes C(HgX)4 (X = F, Cl, Br und I): Syntheses and Vibrational Spectra
Authors: Breitinger Dietrich , Morell Wilfred , Grabetz Knut 
Published: February 2015

Abstract
The complete series of tetrakis(halomercuri)methanes C(HgX)4 (X = F, Cl, Br and I) was prepared by metathesis of tetrakis(acetoxymercuri)methane and aqueous hydrofluoric acid and solutions of halides (Cl-, Br-, and I-), respectively. All compounds are insoluble in most common solvents, but partly soluble in dimethylsulfoxide. Complete vibrational spectra indicate more or less ideally tetrahedral molecules C(HgX)4 in all cases. The originally triply degenerate valence vibrations of the CHg4 entities and the force constants for the C-Hg bonds show distinct correlations with the electronegativities of the halides X. On the other hand the totally symmetrical valence vibrations of CHg4 were found to be highly sensitive to variations in X, mainly due to coupling with the valence vibrations of the Hg-X-groups of the same symmetry species. Some analogies in the vibrational behaviour of the CHg4 fragments and of the isosteric NHg4 core in tetramercurioammonium complexes were observed and discussed.
Na3Cu4S4-ein Thiocuprat mit unverknüpften 1
∞[Cu4S4] -Ketten / Na3Cu4S4-a Thiocuprate with Isolated 1
∞[Cu4S4]-Chains
Authors: Burschka Christian 
Published: February 2015

Abstract
Na3Cu4S4 can be prepared by fusion reaction of copper with Na2CO3 and sulfur at 600 °C. The structure (orthorhombic, Pbam, a= 14,624(6), 6 = 7,163(3), c = 3,771(1)Å; Z = 2) solved from x-ray diffractometer data (R = 0,024; 391 obs. reflections) shows unlinked copper-sulfur chains of the kind already observed in two-dimensional copper-sulfur networks.
Cyclotri(λ3-phospliazane) / Cyclotri(λ3-phosphazanes)
Authors: Zeiss Werner , Barlos Kleomenis 
Published: February 2015

Abstract
P-perhalogenated cyclotri(λ3 -phosphazanes) 3 a, b are obtained from the reaction of 1 or 2 with excess PX3 (X = Cl, Br). Under mild reaction conditions 4-7 are found to be intermediates. The existence of a six-membered ring trimer is proven by NMR and mass spectroscopy. No dimer (XPNMe)2 could be detected.
Beiträge zum thermischen Verhalten von Sulfaten, IV* Neues zum Verhalten von PbSO4 bei höherer Temperatur / Contributions to the Thermal Behaviour of Sulfates, IV* New Facts About the Behaviour of PbSO4 at Higher Temperature
Authors: Spieß Manfred , Gruehn Reginald 
Published: February 2015

Abstract
Thermal Behaviour, Crystal Structures, Modifications Using the high temperature Guinier technique the transformation of the room temperature form N-PbSO4 to the cubic high-temperature form H-PbSO4 was observed. The nonquenchable H-PbSO4 modification crystallizes in the α-NaClO4-type with a(900°) = 7,23 Å, Z = 4 and dX-ray (900 °C) = 5,33 g/cm3 . The thermal dilatation of N-and H-PbSO4 was measured.
Crystal Structure of (NH4)2[Mo3S(S2)6] Containing the Novel Isolated Cluster [MO3S13]2-
Authors: Müller A. , Pohl S. , Dartmann M. , Cohen J. P. , Bennett J. M. , Kirchner R. M. 
Published: February 2015

Abstract
The novel tri-nuclear metal-sulfur cluster [Mo3S(S2)6]2- can be obtained as its ammonium salt by the reaction of a Moiv containing aqueous solutions with polysulfide. Its crystal and molecular structure has been determined by a single crystal X-ray study. The crystals are monoclinic (space group Cm, with a = 11.577(6) Å, b = 16.448(7) Å, c = 5.716(2) Å, β = 117.30(3)°, V = 967.2 Å3 , Z = 2, dexptl. = 2.54(2) g/cm3 , dcal = 2.54 g/cm3). The structure consists of isolated [Mo3S(S2)6]2- units, with three Mo atoms at the vertices of a triangle. There are bridging as well as terminal S2
2--ligands lying above and below the Mo3-plane (bond distances: Mo-Mo = 2.722 Å, Mo-S(terminal) = 2.435, Mo-S(bridging) = 2.452, Mo3-S = 2.353(4) Å and S-S = 2.04 Å (mean values)).
Catalytic Oxygenation of 3-Methylindole by Co(II)-Schiff Base Planar Complexes
Authors: Nomiya Kenji , Wako Nahoko , Komiyama Tomoko , Miwa Makoto 
Published: February 2015

Abstract
N,N′-Ethylenebis(acetylacetoniminato)Co(II),Co(acacen),and N,N′-ethylenebis(benzoyl acetoniminato)Co(II), Co(bzacen), catalyze the oxygen incorporation into 3-methylindole to give o-formylaminoacetophenone selectively. The adducts formation process of three components, that is, substrate, planar cobalt complex and molecular oxygen, and the following catalytic oxygen incorporation process were confirmed by manometric measurements of oxygen uptake, gas-chromatographic analyses of products and electronic spectra of intermediate oxygen adducts. The mechanism was further justified by the study of 1H NMR spectra on overall reactions.
Elementorganische Verbindungen mit o-Phenylenresten, IV [1]Synthese von 2.3.7.8.12.13-Hexamethoxytribenzo[b.e.h] [1.4.7]- trithiacyclononatrien / Organometalloidal Compounds with o-Phenylene Substituents, IV [1]Synthesis of 2,3,7,8,12,13 - Hexamethoxytribenzo [b,e,h] [1,4,7] trithiaonin
Authors: Weiss Tilman , Klar Günter 
Published: February 2015

Abstract
The synthesis of the title compund, starting from 1,2-dimethoxybenzene, is described.
Zur elektrocyclischen Ringöffnung von Cyclopropylhalogeniden bei der Reaktion mit Natriumiodid in Aceton / Electrocyclic Ring Opening of Cyclopropyl Halides in the Course of their Reaction with Sodium Iodide in Acetone
Authors: Luckenbach Reiner , Müller Nikolaus 
Published: February 2015

Abstract
Reaction of cyclopropyl halides with sodium iodide in acetone (i.e. under typical SN2-conditions), proceeds via ring opening to allylic systems finally yielding 1,5-hexadienes upon dimerisation; ring-retained products were not detected. Application of the Wood-ward-Hoffmann rules lends strong support to a cationic synchronous mechanism. This is also confirmed by kinetic measurements proving this reaction to be first order over all. The kinetic data are shown to fit the Hammett equation using σ-values for cyclopropyl bromides and σ+-values for geminal cyclopropyl dichlorides, respectively. The validity of the Woodward-Hoffmann-De Puyrule (according to which in synchronous reactions leaving groups situated endo are strongly favored over those situated exo) is tested in corresponding experiments involving condensed ring systems.
Transalkylierung und protonenkatalysierte C-C-Spaltung bei n-Butyl-und n-Pentylbenzol in der Gasphase / Transalkylation and Proton Catalyzed C-C-Cleavage of Gaseous n-Butyl and w-Pentyl Benzenes
Authors: Wesdemiotis C. , Schwarz H. , Sande C. C. Van de , Van Gaever F. 
Published: February 2015

Abstract
The investigation of several 13carbon and deuterium labelled n-butyl and n-pentyl benzenes demonstrate that chemical ionization (reagent gas: methane) induces specific carbon-carbon bond cleavages of the alkyl group. The extent of competing reaction channels as for instance direct alkene elimination versus dealkylation/reprotonation is analyzed. Partial hydrogen exchange processes between reagent ions and substrate molecules are restricted to the phenyl ring. Intramolecular exchange reactions between the side chain and the aromatic ring which are typical for the open shell molecular ions of alkyl benzenes are not observed for analogous closed shell cations.