bluuebunny/crossref_metadata_2025_split huggingface dataset:
Metallkomplexe mit biologisch wichtigen Liganden, CL [1]. 1,1-Dithiolato-Komplex von Palladium(II), Platin(II) und Gold(I) aus Diphenylmethylenglycinester sowie N,N-Dimethylglycinester und Schwefelkohlenstoff
Authors: Lang Markus A. , Sünkel Karlheinz , Ponikwar Walter , Beck Wolfgang 
Published: August 2018

The 1,1-dithiolates Ph2C═N-C(CO2Et)═CS2
2− and Me2NC(CO2Et)═CS2
2− from diphenylmethylene glycine ethylester or N,N-dimethylglycine ester and CS2 react under basic conditions with chlorophosphine compounds of Pd(II), Pt(II) and gold(I) to give the complexes Ph2C═N-C(CO2Et)═CS2ML2, Me2N-C(CO2Et)═CS2ML2 (M = Pd, Pt; L = PPh3, 2L = Ph2PCH2CH2PPh2) and Ph2C═N-C(CO2Et)═CS2(AuPPh3)2, and Me2N- C(CO2Et)═CS2(AuPPh3)2.
The structures of the palladium complex Ph2C═N-C(CO2Et)═CS2Pd(PPh3)2 and of diphenylmethylene- L-alanine ethylester were determined by X-ray diffraction. Besides this S,S-complex also the (less stable) S,O-isomer could be detected.
Reactivity of Alkoxyethynyl(trimethyl)silane, -germane and -stannane towards Trialkylboranes. Organometallic-Substituted Enol Ethers
Authors: Wrackmeyera Bernd , Gruener Sergej V. , Zolotareva Alla S. 
Published: August 2018

Abstract
Methoxyethynyl(trimethyl)silane (1a) reacts at 100°C very slowly with triethylborane (4) to give a mixture of alkenes, one of which is the 1,1-organoboration product (Z)-1-methoxy-1-trimethylsilyl- 2-diethylboryl-but-1-ene (7a). Methoxyethynyl(trimethyl)germane (2a) reacts within minutes at 60 - 70°C with 4, tripropylborane (5) and 9-ethyl-9-borabicyclo[3.3.1]nonane (6) by 1,1-organoboration in the usual regio- and stereospecific way to give the corresponding alkenes (9a - 11a). The analogous reactions of the ethoxyethynyl(trimethyl)germane (2b) require longer heating and are accompanied by decomposition of 2b. Ethoxyethynyl(trimethyl)stannane (3b) reacts with the trialkylboranes 4- 6 already below room temperature by 1,1-organoboration to give the alkenes (12b - 14b) in quantitative yield. The compound 3b also reacts with the alkenes, e.g. 9a, 13b, 14b, to give novel organometallicsubstituted dienes. All products were characterised by multinuclear magnetic resonance spectroscopy (1H, 11B, 13C, 29Si, and 119Sn NMR).
Verbindungen mit Pentelid-Hanteln M2: AI
II M6 und AII
11M10 (A = Rb, Cs, Ba; M = Sb, Bi) / Compounds with Pentelide Dumbbells M2: AI
11M6 and AII
11M10 (A = Rb, Cs, Ba; M = Sb, Bi)
Authors: Emmerling Franziska , Längin Nina , Pickhard Frank , Wendorff Marco , Röhr Caroline 
Published: August 2018

Abstract
The new ternary alkali pentelides A11M6 (A = Rb, Cs; M = Sb/Bi) all contain non electron-precise isolated dumbbells statistically composed of Sb/Bi. Their phase ranges as determined from single crystal data were found to be on the Sb-rich side of the overall composition A11Sb6−xBix in the case of the Rb compound (i. e. Rb11Sb5.4Bi0.6: orthorhombic Immm, a = 766.7(3), b = 1052.2(3), c = 1732.7(6) pm, Z = 4, R1 = 0.0554), and on the Bi-rich side of the overall composition A11Sb6−xBix in the case of A = Cs (i.e. Cs11Sb1.6Bi4.4). In the series of known alkaline earth compounds A11M10, containing pentelide dumbbells among isolated Zintl anions, a redetermination of the structure of Ba11Sb10 (orthorhombic, Immm, a = 1265.3(2), b = 1316.1(3), c =1947.2(5) pm, Z = 4, R1 = 0.0724) shows, that it represents a distorted variant of the tetragonal Ho11Ge10 structure type. This distortion is not only of crystallographic importance, as it results in a major change in the nature of the anions and their bonding, which is supported by DFT band-structure calculations. Likewise, the Zintl phase BaSb2 (monoclinic, P21/m, a = 1167.9(9), b = 438.1(5), c = 1257.1(9) pm, β = 100.53(2)°, Z = 6, R1 = 0.0648) crystallizes with a superstructure of the CaSb2-type previously reported.
Orthoamide, LX [1]. N,N,N’,N’-Tetraformylhydrazin – ein breit anwendbares Formylierungsmittel für aromatische Verbindungen / Orthoamide, LX [1]. N,N,N’,N’-Tetraformylhydrazine – a Formylation Agent for Aromatic Compounds of Wide Scope
Authors: Kantlehner Willi , Haug Erwin , Scherr Oliver , Stoyanov Edmont V. , Mezger Jochen , Ziegler Georg 
Published: August 2018

Keywords
The reagent system formed from N,N,N’,N’-tetraformylhydrazine (3) and aluminum chloride allows the formylation of aromatic compounds. The scope of the method is comparable with the Olah formylation and the Groß-Rieche procedure, since benzene and fluorobenzene can be formylated. Two formyl groups are transferred from 3 to the aromatic nuclei when a molar ratio 4:1:4 (aluminum chloride/3/aromatic compound) is chosen.
Fries Rearrangement of Aryl Formates Promoted by BCl3. Mechanistic Evidence from 11B NMR Spectra and DFT Calculations
Authors: Bagno Alessandro , Kantlehner Willi , Kreß Ralf , Saielli Giacomo 
Published: August 2018

Abstract
The Fries rearrangement of model aryl formate esters, promoted by boron trichloride, has been investigated by means of NMR spectroscopy (both experimental and computational) and by DFT calculations. Firstly, the 11B NMR chemical shifts of a series of model boron compounds have been predicted by GIAO-B3LYP/6-31G(d,p) calculations, in order to make predictions of the chemical shifts of transient reaction intermediates observable by 11B NMR. Such 11B spectra for the reaction of two esters (phenyl and 3-methyoxyphenyl formates) have been obtained, and are found to follow different patterns which can be rationalized on the basis of computed chemical shifts. Secondly, DFT calculations (B3LYP/6-31G(d,p) level) have been employed to investigate several mechanistic pathways of the rearrangement of phenyl formate. It is found that the pathways leading to the lowest activation energies are those in which formyl chloride is generated from a complex between phenyl formate and BCl3, which then acts as the formylating agent.
The Coupling-Isomerization Approach to Enimines and the First Sequential Three-Component Access to 2-Ethoxy Pyridines
Authors: Dediu Oana G. , Yehia Nasser A. M. , Müller Thomas J. J. 
Published: August 2018

Abstract
The coupling-isomerization reaction (CIR) of electron-deficient halides 1 with N-[1-(hetero)arylprop-2-ynyl] tosyl amides 2 leads to the formation of N-tosyl enimines 3, in good to excellent yields. These electron deficient heterodienes are perfectly suited for Diels-Alder reactions with inverse electron demand. In the sense of a one-pot reaction a three-component CIR-cyclocondensation sequence of 1, 2a, and diethyl ketene acetal gives rise to the formation of 2-ethoxy 6-(p-anisyl)pyridines 4 in moderate to good yields.
Reactivity of Tetracyclic Iminium Salts of the Benzo[f]pyrido[2,1-a]- isoindole and Azepino[2,1-a]benzo[f]isoindole Type, with a Preliminary Analysis of their Interactions with Nucleic Acids*
Authors: Maas Gerhard , Herz Hans-Georg , Scheppach Elke , Susanne Barbara , Schneider Hans-Jörg 
Published: August 2018

Abstract
Hydride reduction of the tetracyclic isoindolium salt derivatives 2a - c yields the neutral isoindole derivatives 9-chloro-1,2,3,4,6,6a,7,12b-octahydrobenzo[ƒ]pyrido[2,1-a]isoindole (3a), 4,4a,5,7,8,9,10,10a-octahydropyrido[2,1-a]thieno[3,2-f]isoindole (3b), and 10-chloro- 2,3,4,5,7,7a,8,13b-octahydro-1H-azepino[ƒ]pyrido[2,1-a]isoindole (3c). Oxidation of 3a with selenium dioxide is accompanied by a ring transformation and yields 8-chloro-5,5a,6,12-tetrahydrobenzo[g]pyrrolo[1,2-b]isoquinolin-12-one (4). Deprotonation of isoindolium salt derivatives 2a,c,d yields cyclic enamines which undergo ring expansion with dimethyl acetylenedicarboxylate resulting in compounds with the 4,5,6,8,8a,9-hexahydroazocino[2,1-a]benzo[ƒ]isoindole (6a), 4,6,7,9,9a,10-hexahydro-5H-azonino[2,1-a]benzo[ƒ]isoindole (6c) and 4a,5,7,8,9,10-hexahydro- 4H-azonino[2,1-a]thieno[3,2- ƒ]isoindole (6d) skeleton. Interactions of 2 with double-stranded nucleic acids are characterized by relatively large NMR upfield shifts (0.25 ppm) and signal broadening (by about 45 Hz) of aromatic ligand signals, indicating at least partial stacking with nucleobases. Rather small effects are observed, however, in melting point and viscosity increase with double strands; this is tentatively ascribed to competitive interactions with unfolded polymer parts.
The Pd(II) Complex of a Bidentate Di(benzimidazol-2-ylidene) Ligand
Authors: Hahn F. Ekkehardt , Fehrena Thorsten von , Wittenbecher Lars , Fröhlich Roland 
Published: August 2018

Abstract
The pale yellow palladium(II) dicarbene complex cis-[PdI2(L)], 2 (L = 1,3-bis-(3-neopentylbenzimidazol- 2-ylidene)-2,2-dimethylpropane) was synthesized by the reaction of PdI2 with an N1,N1’- 2,2’-dimethylpropane-bridged dibenzotetraazafulvalene 1 in tetrahydrofuran. The X-ray structure analysis revealed a mononuclear complex with a palladium(II) center coordinated in a slightly distorted square-planar fashion by the bidentate carbene ligand and two iodo ligands.
Synthesis and Characterization of Diarylthiourea Derivatives of Tungsten Carbonyl
Authors: Srivastava Amar , Shrimal A.K. , Nath Amar 
Published: August 2018

Abstract
Reactions of five sym-diarylthioureas (L), viz,, sym-diphenylthiourea (dptu), sym-di-o-tolylthiourea (dottu), sym-di-p-tolylthiourea (dpttu), sym-di-o-anisylthiourea (doatu) and sym-di-α- naphthylthiourea (dαntu) with W(CO)6 have been performed both by reflux and ultra-violet irradiation methods in which only monosubstituted products [(L)W(CO)5] are obtained. Several mixed ligand tungsten carbonyl derivatives, viz., [(o-phen or 2,2’-bipy)(L)W(CO)3] and [(Ph3P or Ph3As)(L)W(CO)4] have also been synthesized. Halogenation of [(L)W(CO)5] yielded heptacoordinated [(L)W(CO)4X2] (X = Br or I). The complexes have been characterized by microanalytical data, conductivity and IR measurements. The C-O stretching force constants and CO-CO stretch-stretch interaction constants of [(L)W(CO)5] derivatives have also been evaluated from the IR spectra.
A New Clerodane Diterpene and Other Constituents from Ajuga chamaepitys ssp. laevigata
Authors: Topçu Gülaçtı , Kökdil Gamze , Türkmen Zeynep , Voelter Wolfgang , Adou Eba , Kingston David G. I. 
Published: August 2018

Abstract
From Ajuga chamepitys ssp. laevigata, a new clerodane diterpene, ajugalaevigatic acid, has been isolated besides five known compounds, a diterpene, (13S)-15-hydroxylabd-8(17)-en-19-oic acid, a steroidal glucoside, 3-O-β -D-glucopyranosyl-stigmasta-5,25-diene, and triterpenes,α- and β -amyrin and ursolic acid. Their structural elucidation is based on NMR and MS spectroscopic analyses. For the new compound 2D NMR experiments were carried out. Ajugalaevigatic acid was tested against a panel of cytotoxic cell lines, and only found to be active against the A2780 human ovarian cancer cell line.
Interesting Behavior of Acetone under the Willgerodt-Kindler Reaction Conditions
Authors: Darabi Hossein Reza , Aghapoor Kioumars , Nakhshab Leila 
Published: August 2018

Abstract
A one-pot synthesis of thiomorpholides 1 - 3 is introduced. The Willgerodt-Kindler reaction of acetone with sulfur and morpholine gives selectively one of the products 1 - 4 depending upon the proper choice of the reaction condition. The formed products are strongly dependent on the experimental conditions. The pathways of the reaction toward the formation of each product are also proposed.
The Solid Solution TmNi1–x–yIn1+x
Authors: Lukachuk Mar’yana , Kalychak Yaroslav M. , Pöttgen Rainer 
Published: August 2018

Abstract
The thulium nickel indide TmNiIn forms solid solutions TmNi1−x−yIn1+x. Several samples have been prepared by arc-melting of the elements under argon. The structure of TmNiIn contains two crystallographically different nickel sites. The Ni1 atoms have a trigonal prismatic coordination by indium, while the Ni2 sites have six thulium neighbors in a trigonal prismatic arrangement. The Ni1 sites show defects in the solid solution, while the Ni2 sites have Ni2/In mixing with a maximal occupancy of 32 at.-% indium. The structures of three single crystals of solid solutions have been refined, leading to the compositions TmNi0.88In1.10 (a =747.06(7), c = 367.8(1) pm, wR2 =0.0342, 323 F2 values, 16 variables), TmNi0.80In1.16 (a= 752.94(7), c =366.5(1) pm, wR2=0.0475, 503 F2 values, 16 variables), and TmNi0.76In1.21 (a = 758.4(1), c = 366.68(7) pm, wR2 = 0.0949, 226 F2 values, 16 variables). The crystal chemical peculiarities and the differences in chemical bonding are briefly discussed.
Über die Dialkaliacetylendicarboxylate Na2(C2(COO)2)(H2O)4 und K2(C2(COO)2)(H2O) / On Dialkali Acetylenedicarboxylates Na2(C2(COO)2)(H2O)4 and K2(C2(COO)2)(H2O)
Authors: Billetter Heinrich , Pantenburg Ingo , Ruschewitz Uwe 
Published: August 2018

Abstract
From aqueous solutions containing acetylenedicarboxylic acid and Na2CO3 or KOH single crystals of Na2(C2(COO)2)(H2O)4 (P21/n, Z = 2) and K2(C2(COO)2)(H2O) (P1̅, Z = 2) were obtained by slow evaporation of the solvent. In Na2(C2(COO)2)(H2O)4 the sodium atom is co-ordinated almost octahedrally by three water molecules and three oxygen atoms of the carboxylate ligands. These octahedra are connected to layers, which are held together by hydrogen bonds. In K2(C2(COO)2)(H2O) two crystallographic distinct potassium ions exist both seven co-ordinate by oxygen atoms stemming from water molecules and carboxylate ligands. These KO7 polyhedra are linked to a threedimensional structure by the bifunctional carboxylate anions and the water molecules.
An Internally Coordinated Metalla[14]-crown-5 System with a Pentagonal-dipyramidal Coordination Geometry of the Central Titanium Atom
Authors: Unger Gesa , Erker Gerhard , Kehr Gerald , Fröhlich Roland 
Published: August 2018

Abstract
Treatment of the dilithiated dibenzotetraethyleneglycol reagent [(o-C6H4OLi)-(OCH2CH2)2O- (o-C6H4OLi)] (5) with TiCl4 · 2 THF gave the corresponding metal complex [{(o-C6H4O-) - (OCH2CH2)2O-(o-C6H4O-)}TiCl2] (6). The X-ray crystal structure analysis of 6 revealed that all five oxygen atoms are located in one plane and bonded to titanium in a pentagonal-dipyramidal geometry with the two chloride ligands being oriented trans to each other in the apical positions.
Protoilludane-Type Sesquiterpenes, Echinocidins A and B, from a Mycelial Culture of Echinodontium tsugicola
Authors: Shiono Yoshihito , Seto Takayuki , Kamata Manabu , Takita Chinatsu , Suzuki Shinsuke , Murayama Tetsuya , Ikeda Michimasa 
Published: August 2018

Abstract
Two novel protoilludane sesquiterpenoids, echinocidins A (3) and B, (4) have been isolated from an artificial liquid culture of the basidiomycetous fungus Echinodontium tsugicola and their structures clarified spectroscopically. Echinocidin A (3) accelerated primary root growth to 117% and echinocidin B to 180% of controls at a concentration of 100 ppm.
Formation of an Iron(III) Oxo Cubane Core Fe4(μ4-O)4 from FeCl3 and the Unsymmetrical Tripodal Ligand N[(CH2CH2NH2)(CH2CH2OH)(CH2CH2CH2OH)]
Authors: Hahn Ekkehardt , Jocher Christoph , Lügger Thomas 
Published: August 2018

Abstract
The coordination chemistry of the unsymmetric, aliphatic, tetradentate tripodal ligand N[(CH2CH2NH2)(CH2CH2OH)(CH2CH2CH2OH)] H4-1 with iron chlorides was investigated. The disodium salt of the deprotonated ligand Na2(H2-1) reacts with FeCl3 to yield a yellow precipitate which upon recrystallization from DMSO/CH2Cl2 gives red crystals of the octanuclear iron(III) complex [{FeIIICl(H2-1)}4FeIII
4(μ4-O)4Cl4] 2 ・ 4CH2Cl2 containing a central Fe4(μ4-O)4 cubane core. Crystals of 2 ・4DMF were obtained by slow oxidation of the green iron(II) complex obtained from ferrous chloride and Na2(H2-1) after recrystallization from DMF. The structure determination of 2 ・4CH2Cl2 also revealed the presence of the iron(III) oxo cubane core. The core is surrounded by four iron atoms each coordinated by η4-(H2-1)2- and Cl- ligands.
Development of A Novel Solid-State pH Sensor Based on Tin Oxide Thin Film
Authors: El-Agez Taher M. , Al-Saraj Manal R. , Abdel-Latif Monzir S. 
Published: August 2018

Abstract
A solid-state pH sensor was fabricated using a transparent conductive tin oxide film on a glass substrate. The coating of the glass substrate was achieved by a novel simple chemical vapor deposition (CVD) procedure. The response time of the pH sensor was substantially reduced when a thin graphite film was deposited onto the tin oxide conductive film. The sensor slope was found to increase as the temperature of the solution was increased. The performance of the sensor was investigated in the pH range from 0.3 to 11.0. A straight-line calibration graph was achieved throughout the whole range tested, especially when the solution temperature was 80 ℃. The working pH range was found to decrease on the expense of the lower range as the temperature was decreased. Results obtained by the suggested sensor compares very well with conventional pH electrodes where the square of the correlation coefficient was 0.999.
Diastereomeric Halfsandwich Rhenium Complexes Containing Thiolate and Thioaldehyde Ligands
Authors: Dilsky Stefan , Schenk Wolfdieter A. 
Published: August 2018

Abstract
The reaction of diastereomeric methyl rhenium complexes [CpRe(NO)(NMDPP)(CH3)] (NMDPP = neomenthyl-diphenylphosphine) and [CpRe(NO)(PAMP)(CH3)] (PAMP = phenyl-2- anisyl-methylphosphine) with thiols in the presence of HBF4 gave thiolate complexes [CpRe(NO)(NMDPP)(SCH2Ph)] and [CpRe(NO)(PAMP)(SCH2R)] (R = Ph, 4-C6H4Cl, 4-C6H4OMe, 2-C4H3O, CH3, CH=CH2). Treatment of [CpRe(NO)(PAMP)(THF)]BF4 with the thiols and Na2CO3 gave the same compounds under neutral conditions. Similarly, the reaction of the chelate complex {CpRe(NO)[κP(Ph)(Me)(CH2C4H3κS)]}BF4 with thiols and NaOEt yielded the ring-opened products {CpRe(NO)[P(Ph)(Me)(CH2C4H3S)](SCH2R)} (R = Ph, 4-C6H4Cl, 4-C6H4OMe). One of the benzylic hydrogen atoms can be abstracted with [Ph3C]BF4 to give the diastereomeric thiobenzaldehyde complexes [CpRe(NO)(PAMP)(S=CHR)]BF4 (R = Ph, 4-C6H4Cl, 4-C6H4OMe) and {CpRe(NO)[P(Ph)(Me)(CH2C4H3S)](S=CHPh)}BF4. In these products, the thioformyl group is predominantly η2(C,S) coordinated to rhenium, but in a few cases the corresponding η1(S) isomers were also detected by IR and NMR spectroscopy.
Multidentate Aminoalkoxides. Synthesis and Complexation Behavior to Lithium and Sodium
Authors: Müller Gerhard , Schätzle Torsten 
Published: August 2018

Abstract
The tris(dimethylaminomethyl)-substituted alcohol (R2NCH2)3COH (R = Me: 1) was synthesized by reaction of 1-chloro-2,3-epoxy-2-chloromethylpropane with a large excess of 40% aqueous HNMe2 in 95% yield as colorless liquid (b.p. 87 ­­°C/1 mbar). Similar syntheses led to the respective amino alcohols with R = Et, CH2Ph. The dimethylamino alcohol 1 was characterized crystallographically as hydrochloride salt 2. Reaction of 1 with elemental sodium in toluene gave the tetrameric alcoholate [(Me2NCH2)3CONa]4 (3) which has a heterocubane structure in the solid state. In addition to three oxygen atoms, each sodium atom is coordinated by two amino groups from two different adjacent ligands (Na-N 2.529(3)/2.628(3) Å ). Reaction of 1 with LiNMe2 afforded the lithium alcoholate which crystallized as dimeric mixed-anion aggregate [(Me2NCH2)3COLi·LiNMe2]2 (4). It has a four-rung ladder structure consisting of two four-membered Li(NMe2)LiO rings connected through a central LiOLiO ring. All ligand amino groups are lithium-coordinated (Li-N 2.117(6)/2.101(6)/2.218(6) Å) as is the amido nitrogen atom (Li-N 1.964(6)/2.027(6) Å). Reaction of 1 with LitBu in n-hexane also led to deprotonation at oxygen. In addition, in one ligand one methyl group is deprotonated, in a second one two methyl groups are lithiated leading to doubly and triply charged anions, respectively. The product crystallizes as the dimeric mixed-anion aggregate [(−H2CN(Me)CH2)(Me2NCH2)2CO−·5 Li+· (−H2CN(Me)CH2)2(Me2NCH2)CO−]2 (5) having a core of 10 Li+ cations, 4 alcoholate oxygen atoms, and 6 N(Me)-CH2
− groups.
N-Benzyl- und N-Heptyl-substituierte Tetraazacyclododecane / N-Benzyl and N-Heptyl Substituted Tetraazacyclodecanes
Authors: Schumann Herbert , Kuse Katharina , Dechert Sebastian 
Published: August 2018

Abstract
1,5-Bis(methylsulfonyloxi)-3-aza-3-p-toluenesulfonylamidopentane (1) reacts with 4-benzyl-1,7- bis(p-toluenesulfonyl)diethylenetriamine (2) and 4-benzyl-1,7-bis(p-nitrophenylsulfonyl)diethylenetriamine (3) and Cs2CO3 yielding 1-benzyl-4,7,10-tris(p-toluenesulfonyl)-1,4,7,10-tetraazacyclododecane (9a) and 1-benzyl-4,10-bis(p-nitrophenylsulfonyl)-7-p-toluenesulfonyl)-1,4,7,10-tetraazacyclododecane (10a), respectively. The corresponding dimers 1,13-bis(benzyl)-4,7,10,16,19,22- hexa(p-toluenesulfonyl)-1,4,7,10,13,16,19,22-octaazacyclotetracosane (9b) and 1,13-bis(benzyl)- 4,10,16,22-tetra(p-nitrophenylsulfonyl)-7,19-bis(p-toluenesulfonyl)-1,4,7,10,13,16,19,22-octaazacyclotetracosane (10b) could not be isolated but detected by mass spectroscopy. The reactions of 1 with 4-heptyl-1,7-bis(p-nitrophenylsulfonyl)diethylenetriamine (5) and Cs2CO3 results in the formation of 1-heptyl-4,10-bis(p-nitrophenylsulfonyl)-7-p-toluenesulfonyl)-1,4,7,10-tetraazacyclododecane (11) and 1 reacts with 4-benzyl-diethylenetriamine (4) and Cu(O2CCH3)2 forming the dimeric copper complex [{C6H5CH2N(CH2CH2NH2}2Cu(μ-Cl)OSO2CH3]2 (12). The 1H and 13C NMR spectra of the new compounds as well as the single crystal X-ray structure analyses of 9a, 11, and 12 are reported and discussed.
Metal Complexes of Biologically Important Ligands, CLVI [1]. Metal Complexes of 4-Iodo-L-phenylalanine. Oxidative Addition of 4-Iodo-L-phenylalanine Ester to Palladium(0)
Authors: Kayser Bernd , Beck Wolfgang 
Published: August 2018

Abstract
4-Iodo-L-phenylalanine gives with the chloro bridged compounds [(Et3P)PtCl2]2, [(Et3P)PdCl2]2 and [Cp*IrCl2]2 the N,O-chelate complexes (L)(Cl)M[NH2-C(H)(CH2C6H4I)CO2] (M = Pt, Pd, Ir; L = PEt3, Cp* ) (1 - 3). Oxidative addition of N-protected 4-iodo-L-phenylalanine methylester to Pd(dba)2 in the presence of 2,2’-bipyridyl or of triphenylphosphine affords the p-phenyl metallated amino acids (bipy)(I)Pd[C6H4CH2C(H)(NHR)CO2Me] (4,5) and (PPh3)2 (I)Pd[C6H4CH2C(H)(NHR) CO2Me] (6,7). Oxidative addition of the coordinated 4-iodo-Lphenylalaninate in (Et3P)(Cl)M[NH2C(H)(CH2C6H4I)CO2] to Pd(dba)2 was also observed.
A Novel Crown-Ether Stabilized Oxonium Halogenochalcogenate(IV): [H7O3(Bis-dibromo-dibenzo-30-crown-10)][Se2Br9]·1.5CH2Cl2
Authors: Hammerschmidt Adrienne , Beckmann Illenora , Läge Mechtild , Krebs Bernt 
Published: August 2018

Abstract
The title compound [H7O3(bis-dibromo-dibenzo-30-crown-10)][Se2Br9] ·1.5CH2Cl2 (1) was isolated from a solution of SeBr4 and dibenzo-30-crown-10 in CH3CN/CH2Cl2 containing a small amount of hydrobromic acid. During the reaction the crown ether is brominated by HBr. The compound crystallizes in the monoclinic space group P21/n with a = 17.688(11), b = 14.921(6), c = 20.521(12) Å , β = 97.71(5)°, and Z = 4. 1 is a novel example in the series of supramolecular halogenochalcogeno acids prepared in our group in which different oxonium cations are stabilized and encapsulated by crown ethers. Especially in this class of superacids complexation by cyclic polyethers offers covenient and variable possibilities for the controlled synthesis of oxonium cations. In the present case the large dibenzo-30-crown-10 ring systems are able to stabilize trinuclear [H7O3]+ cations within their cavities. Besides the macromolecular cations and some dichloromethane solvent molecules, the crystal structure of 1 contains molecular [Se2Br9]− ions with approximate D3h symmetry, each consisting of two face-sharing SeBr6 octahedra.