bluuebunny/crossref_metadata_2025_split huggingface dataset:
Chemical Basis for High Activity in Oxygenation of Cyclohexane Catalyzed by Dinuclear Iron(III) Complexes with Ethereal Oxygen Containing Ligand and Hydrogen Peroxide System
Authors: Ito Sayo , Okuno Takashi , Itoh Hiroki , Ohba Shigeru , Matsushima Hideaki , Tokii Tadashi , Nishida Yuzo 
Published: August 2018

Abstract
The crystal structures of two binuclear iron(III) complexes with linear μ-oxo bridge, Fe2OCl2 (tfpy)2 (ClO4)2 ·2CH3CN and Fe2OCl2(epy)2(ClO4)2 were determined, where (tfpy) and (epy) represent N,N-bis(2-pyridylmethyl)-tetrahydrofurfurylamine and N,N-bis(2-pyridylmethyl)-2-ethoxyethylamine, respectively. Their structural features are essentially the same as that of the corresponding linear binuclear complex with (tpa)-complex, Fe2OCl2(tpa)2(ClO4)2, where (tpa) is tris(2-pyridylmethyl)amine; the ligands (tfpy) and (epy) act as a tetradentate tripod-like ligand, and Fe-O (ethereal oxygen atom; these are located at the trans-position of bridging oxo-oxygen atom) distances are 2.209(4) and 2.264(2) Å for (tfpy) and (epy) compounds, respectively. These two (tfpy) and (epy) complexes exhibited much higher activity for the oxygenation of cyclohexane in the presence of hydrogen peroxide than that of the (tpa) complex. In contrast to this, the former two complexes exhibit negligible activity for the decomposition of hydrogen peroxide, whereas the catalase-like function of the (tpa) compound is remarkable. These are indicating that an active species for oxygenation of cyclohexane, which is assumed to be an iron(III)-hydroperoxide adduct with η1-coordina­tion mode, should be different from that is operating for decomposition of hydrogen perox­ide; for the latter case formation of a (μ-η1:η1-peroxo)diiron(III) species being stressed. The EHMO calculation showed that electronic interaction between the monodentate hydroperox­ide adduct of the binuclear iron(IIl)-(tfpy) compound and the tetrahydrofuran ring of the ligand system may lead to facile peroxide-tetrahydrofuran linkage formation, and the interac­tion described above should promote the O-O cleavage of the peroxide ion heterolytically. Based on these discussions, it was concluded that heterolytic O-O bond cleavage of the iron(III)-hydroperoxide adduct caused by electronic interaction with organic moiety contain­ing an ethereal-oxygen and by approach of the substrate which donates electron to the perox­ide adduct should play an important role in producing a high-valent iron-oxo species in these systems. In the case of (tpa) complex, formation of a hydroperoxide adduct linking with the ligand system seems to be unfavorable because of both the steric and electronic reasons.
Novel Electrochemically Derived Dimers of Methylated Uracils
Authors: Bojarska Elżbieta , Kamiński Jarosław , Stolarski Ryszard , Kazimierczuk Zygmunt 
Published: August 2018

Abstract
Electrolysis of acetic acid/sodium acetate solutions of N-methylated uracils results in the formation of 5-substituted methyl and acethoxy derivatives. Electrolysis of trifluoroacetic acid/potassium trifluoroacetate solutions of N-1-and N-3-methylated uracils provided, be­ sides 5-trifluoromethyl derivatives, novel N-C uracil dimers. In the case of 1,3-dimethyluracil in trifluoroacetic acid. N-l demethylathion was also observed.
Synthese von 2,2-DiphenylethyI-substituierten Silanen -Molekülstruktur von Trichlor-2,2-diphenylethylsilan /Syntheses of 2,2-Diphenylethyl-Substituted Silanes -Molecular Structure of Trichloro-2,2-diphenylethylsilane
Authors: Dautel J. , Abele S. , Schwarz W. 
Published: August 2018

Abstract
Hydrosilylation of 1,1-diphenylethylene with trichlorosilane leads in high yields to trichloro-2.2-diphenylethylsilane (1), which was investigated spectroscopically as well as by X-ray structure determination. The compound crystallizes monoclinically in the acentric space group Cc {a = 1002.4, b = 1573.8, c = 979.7 pm, β = 106.27°, Z = 4}; the bonding parameters show no special features. By fluorination with zinc(II) fluoride in diethylether and by reduction with “Red-Al” in toluene, the corresponding SiF3 (2) and SiH3 derivatives (3) are received, respectively.
Synthese und Kristallstruktur von Perhydro-1,4-benzoxazino[2,3-n]phenoxazin/Synthesis and Crystal Structure of Perhydro-1,4-benzoxazino[2,3-n]phenoxazine
Authors: Kläui Wolfgang , Schoger Susanne , Nieger Martin 
Published: August 2018

Abstract
The oxidation of trans-2-aminocyclohexanol with nitrobenzene in the presence of catalytic amounts of iron inter alia yields perhydro-1,4-benzoxazino[2,3-n]phenoxazine (1). This compound has been characterized analytically, spectroscopically and by X-ray diffraction. It is postulated that the oxidation of the 2-aminoalcohol leads to the intermediate formation of a 1,2-dione. The direct synthesis of 1 from trans-2-aminocyclohexanol and 1,2-cyclohexandione supports this hypothesis.
Enantioselektive Katalyse, 109 Neue erweiterte chirale Bipyridine/Enantioselective Catalysis, 109 New Expanded Chiral Bipyridines
Authors: Brunner Henri , Poleschak Ingo 
Published: August 2018

Abstract
Optically active two and three layer nitrogen ligands were synthesized by reacting the N-BOC-protected aminoalcohols (1S,2S)-2-amino-1 -phenyl-1,3-propanediol and (S)-2-amino-1,4-butanediol with chloromethyl-benzoic acid chlorides. Expansion was carried out at the chlo-romethyl substituents via nucleophilic substitution with N-methylated (R)-1-phenylethylamine. The deprotected substances were N-benzylated and reacted with 6,6′-bis(bromomethyl)-2,2′-bipyridine to give the new optically active expanded bipyridine ligands.
Darstellung, Kristallstruktur und Schwingungsspektren von Rubidiumperoxoniobat (Rb3NbO8) / Preparation, Crystal Structure, and Vibrational Spectra of Rubidiumperoxoniobate (Rb3NbO8)
Authors: Haeuseler H. , Wagener M. , Müller H. 
Published: August 2018

Abstract
The crystal structure of Rb3NbO8 (SG I4̅2m, Nr. 121) has been determined on single crystals to a final R = 0.041. The structure is isotypic to the K3CrO8 type. Vibrational spectra of the title compound have been recorded on powdered samples and are discussed with respect to the internal vibrations of the peroxo-group and the dodecahedral NbO8
3- ion. The stretching vibrations of the O2
2- groups are found at 838 (Raman) and 813 cm- 1(IR). A factor group analysis for the K3CrO8 type is given.
Synthesis and Characterization of the Manganese Pyroarsenate Mn2As2O7 · 2H2O
Authors: Stock N. , Stucky G. D. , Cheetham A. K. 
Published: August 2018

Abstract
The manganese pyroarsenate hydrate, Mn2As2O7 · 2 H2O, has been obtained as a single phase product using hydrothermal methods and the structure has been determined by single crystal X-ray diffraction. The title compound crystallizes in the monoclinic space group P21/n with a = 6.6576(4), b = 14.555(1), c = 7.8147(5) Å, β = 94.935(1)°, V = 754.46(8) Å3 and Z = 4. The manganese ions are each coordinated to five oxygen atoms and a water molecule in a distorted octahedral arrangement. Edge-sharing MnO6 octahedra form chains which are connected to a three-dimensional framework by As2O7
4- ions. The pyroarsenate anion, which attains a nearly eclipsed conformation, has a mean As-O distance for the terminal As-O bonds of 1.669(2) Å, while for the bridging oxygen atom a mean value of 1.757(2) Å is observed. Magnetic susceptibility measurements indicate the presence of high-spin Mn2+ ions. Thermogravimetric as well as IR and Raman spectroscopic studies of Mn2As2O7 · 2 H2O are presented.
Alkalimetall-Oxosilicate A6[Si3O9] und A6[Si2O7] (A = Rb, Cs): Darstellung und Kristallstruktur/ The Alkaline Metal Oxo-Silicates A6[Si3O9] and A6[Si2O7] (A = Rb, Cs): Preparation and Crystal Structure
Authors: Hoch C. , Röhr C. 
Published: August 2018

Abstract
The title compounds were synthesized via reaction of quartz and AO2 (A = Rb, Cs) with the elemental alkali metals. Their crystal structures were determined on the basis of single crystal X-ray data. All compounds crystallize in the monoclinic system with space group P21/c and lattice constants a = 656.0(l)/684.7(3), b = 1329.7(3)/1375.7(4), c = 1647.6(3)/1703.6(8) pm, β = 107.78(3)/108.23(2)°, Z = 4 (A6[Si3O9], A = Rb/Cs) and a = 668.59(8)/711.4(1), b = 911.37(9)/952.1(2), c = 1121.09(9)/1192.7(7) pm, β = 125.52(9)/126.22(3)°, Z = 2(A6[Si2O7], A = Rb/Cs) respectively. The rubidium and cesium compounds are isotypic with the corresponding potassium silicates.
Notizen: Efficient Medium-Scale Synthesis of 2-Bromo-5-tert-butylbenzene-1,3-dicarbaldehyde
Authors: Klingele Marco H. , Kersting Berthold 
Published: August 2018

Abstract
A short and efficient multi-gram synthesis of the title compound has been designed which al­lows its preparation from commercially available material in only three steps in overall yields of 60-70 % .
Complexation of Organic Dyes by Peptides Built of Lysine and Glutamic Acid Amides
Authors: Mehlmann Heinz , Olschewski Daniel , Olschewski Andrey , Feigel Martin 
Published: August 2018

Abstract
Two amide libraries, Fmoc-[Lys(aci)]4-Gly-resin (1) (aci = 2-naphthylcarbonyl, 1-adamantylcarbonyl and benzyloxycarbonyl) and Fmoc-[δ-Glu(α-amidei)]4-Gly-resin (2) (amidei = morpholineamide, piperidineamide, (N´-phenyl)-piperazineamide), have been synthesized from the corresponding Fmoc-protected amino acid derivatives. Beads of the libraries complex organic dyes (crystal violet and Sudan black) differently according to the sequence of residues in 1 or 2. The results are considered a step towards artificial receptors for small organic molecules build from linear oligoamides.
Bis(triphenylphosphoranylidene)ammonium Dicyanoaurate(I)
Authors: Liau Ruei-Yang , Ehlich Hendrik , Schier Annette , Schmidbaur Hubert 
Published: August 2018

Abstract
Partially 13C-labeled alkali dicyanoaurates M[Au(CN)2] were prepared and investigated by NMR and IR spectroscopy in aqueous solution. For the range of concentration investigated the data obtained under standard conditions provided no evidence for anion association. The salt [Ph3PNPPh3][Au(CN)2] was also prepared and the crystal structure of the dichloromethane solvate determined. There is no anion aggregation in the crystal, and short contacts of the anions are only discernible with the solvent molecules. A literature survey of crystal structure data for dicyanoaurate(I) salts (almost 35 entries) show that inter-anionic contacts are only observed in structures with small cations or with cations exerting a directional influence.
Die neuen Oxobismutate(III) Cs6Bi4O9, K9Bi5O13 und A2Bi4O7 (A = Rb, Cs) / The New Oxobismutates(III) Cs6Bi4O9, K9Bi5O13 and A2Bi4O7 (A = Rb, Cs)
Authors: Emmerling Franziska , Röhr Caroline 
Published: August 2018

Abstract
The title compounds were synthesized at a temperature of 700 °C via oxidation of elemental Bi with the hyperoxides AO2 or via reaction of the elemental alkali metals A with Bi2O3. Their crystal structures have been determined by single crystal x-ray diffraction. They are dominated by two possible surroundings of Bi by O, the ψ-trigonal-bipyramidal three (B) and the ψ-tetrahedral four (T) coordination. Cs6Bi4O9 (triclinic, spacegroup P1̄, a = 813.82(12), b = 991.60(14), c = 1213.83(18) pm, α = 103.658(2), β = 93.694(3), γ = 91.662(3)°, Z = 2) contains centrosymmetric chain segmentes [Bi8O18]12- with six three- (T) and two four-coordinated (B) Bi(III) centers. K9Bi5O13 (monoclinic, spacegroup P21/c, a = 1510.98(14), b = 567.59(5), c = 2685.6(2) pm, β = 111.190(2)°, Z = 4) is a mixed valence compound with isolated [BivO4]3- tetrahedra and chains [BiIII
4O9]6- of two T and two B coordinated Bi. In the compounds A2Bi4O7 (A = Rb/Cs: monoclinic, C2/c, a = 2037.0(3) / 2130.6(12), b = 1285.5(2) / 1301.9(7), c = 1566.6(2) / 1605.6(9) pm, β = 94.783(3) / 95.725(9)°, Z = 8) ribbons [Bi4O6O2/2]2- are formed, which are condensed to form a three-dimensional framework.
Metal Directed One-Pot Syntheses: Mono-, Di- and Tetra-Nuclear Clusters [1]
Authors: Saalfrank Rolf W. , Reimann Uwe , Hampel Frank , Goebel Cornelia , Herbst-Irmer Regine 
Published: August 2018

Abstract
Upon reaction of HL1 1 (picoline-tetrazolylamide) with cobalt(II) acetate under aerobic conditions or with copper(II) acetate, the mono-nuclear complex [CoIII(L1)3] 3 and the di-nuclear complex [Cu2(L1)4] 4 were generated. In 3 and 4, (L1)− exclusively coordinates across its nitrogen donors. However, when HL2 5 (picoline-tetrazolylthioamide) was reacted with copper- or nickel acetate, the di-nuclear cluster [Cu2(L2)4] 6 and the tetra-nuclear cluster [Ni4(L2)8] 7, respectively, were isolated. Contrary to 3 and 4, in 6 and 7, (L2)− also coordinates across sulfur.
New Coordination Polymers Based On Transition Metal Squarates And Pyrazine Ligands
Authors: Näther Christian , Greve Jan , Jeß Inke 
Published: August 2018

Abstract
Three new coordination polymers have been prepared by hydrothermal reaction of squaric acid, pyrazine and the metal halides FeCl2 · 4H2O, CoBr2 and NiBr2. In their crystal structures the metal atoms are coordinated by four water molecules and two pyrazine ligands within slightly distorted octahedra. The pyrazine ligands connect the metal atoms via μ-N,N’-coordination to linear chains which are connected via hydrogen bonding. The squarate dianions are not coordinated to the metal atoms and are located between the chains. The thermal behaviour of all compounds was investigated using TG-DTA-MS measurements. A complex behaviour for all compounds is found and the decomposition temperatures increase from Fe to Ni. From these investigations there are no hints for the occurrence of stoichiometric intermediate compounds.
Synthesis of 2-Phenylisothiazol-3(2H)-One 1,1-Dioxides: Inhibitors of Human Leukocyte Elastase
Authors: Gütschow Michael , Pietsch Markus , Taubert Kathleen , Freysoldt Tonia H. E. , Schulze Bärbel 
Published: August 2018

Abstract
A series of 2-phenylisothiazol-3(2H)-one 1,1-dioxides 14a - q were synthesized by oxidation of isothiazolium perchlorates 12. The inhibition of the serine proteases cathepsin G, chymotrypsin and human leukocyte elastase (HLE) by 14 was investigated. Some 4,5-diphenyl substituted derivatives ( 14i - k) were found to inhibit HLE in a time-dependent manner and exhibited kobs/[I] values > 500 M−1s−1. 14k (kobs/[I] = 2400 M−1s−1), was the most potent HLE inhibitor of this series. Kinetic investigations led to the conclusion that 2-phenylisothiazol-3(2H)-one 1,1-dioxides interact with HLE at the active site as well as at another binding site, resulting in a complex type of inhibition.
A Zwitterionic Platinum Complex with a Carbene Ligand
Authors: Marx Thiemo , Wesemann Lars , Hagen Siegbert , Pantenburg Ingo 
Published: August 2018

Abstract
A new stannaborate complex of platinum is prepared from the reaction of [Bu3MeN]2[trans- (Et3Pt)2Pt(SnB11H11)2] and 1,3-diisopropyl-4,5-dimethylimidazol-2-ylidene (dpdmiy). [trans- (Et3P)2Pt(SnB11H11)(dpdmiy)] has been analyzed by X-ray crystallography and NMR spectroscopy.
New One- and Two-Dimensional Heterometallic Cu/Cd Halogeno or Thiocyanato Bridged Coordination Polymers Synthesized Directly from Elemental Copper and Cadmium Oxide in the Presence of Ethylenediamine
Authors: Pryma Oksana V. , Petrusenko Svitlana R. , Kokozaya Vladimir N. , Shishkin Oleg V. , Zhigalko Marina V. , Linert Wolfgang 
Published: August 2018

Abstract
Three heterometallic Cu/Cd complexes [Cu(en)2CdBr4]·dmso (1), [Cu(en)2CdI4]·dmf (2) and [{Cu(en)2}3Cd(NCS)6](NCS)2 (3) have been synthesized by means of an open-air reaction of unactivated copper powder, cadmium oxide, NH4X (X = Br, I, NCS) and ethylenediamine in non-aqueous solvents, like dmso, dmf and CH3OH. The selection of a counter-anion in the initial ammonium salt provides a facile approach to the controlled assembly of one- or two-dimensional extended networks. Crystallographic investigations reveal that 1 and 2 possess 1D structures via semi-coordination (Cu2+ . . .X) and hydrogen bonds (NH2 . . . OSolv) forming chains with a zigzag arrangement of copper and cadmium atoms. In complex 3 the cadmium atom of each Cd(NCS)6
4− anionic block forms bridges with Cu(II) ions via the sulfur atoms of thiocyanate groups to give 2D polymeric sheets, featuring two different ring sizes, one a 32-membered ring [Cu4Cd4(μ−SCN−S,N)8] and the other a 16- membered ring [Cu2Cd2(μ−SCN−S,N)4]. It is noteworthy, that 3 shows a quite rare Cd(NCS)6
4− fragment with N-bonded thiocyanate groups.
Atomvolumen, Packungsdichte und chemische Bindung in festem Iod unter Druck / Atomic Volume, Packing Density and Chemical Bonding in Solid Iodine under Pressure
Authors: Trömel Martin , Hübner Sven , Taxer Karlheinz 
Published: August 2018

Abstract
The volume changes of solid iodine under pressure are discussed with respect to the packing density of the atoms and to valence. The packing density of solid iodine which is 0.805 under ambient pressure increases to 0.976 in monoatomic iodine-II, 0.993 in iodine-III, and 1 in fcc iodine-IV. Simultaneously, the valence increases from 1 in the free molecule to 1.78 in the crystal structure under ambient pressure, 2.72 - 2.81 in iodine-II, 2.86 - 2.96 in iodine-III, and 3 in fcc iodine-IV. The valence then remains constant up to about 180 GPa and rises moderately to 3.15 at the highest investigated pressure of 276 GPa. Parameters for calculating bond numbers, valences and atomic volumes of densely packed halogens, hydrogen, oxygen, and nitrogen are given.
Absolute Konfiguration von (+)-1,2,3,4,6,7,8,8a-Octahydro-6-isochinolon- 8a-carbonsäuremethylester und die Stereochemie einer Kupfer-katalysierten asymmetrischen Michael-Reaktion / Absolute Configuration of Methyl (+)-1,2,3,4,6,7,8,8a-Octahydro-6-isoquinolone-8a-carboxylate and Stereochemistry of a Copper-Catalyzed Asymmetric Michael Reaction
Authors: Christoffers Jens , Frey Wolfgang , Scharl Heiko , Baro Angelika 
Published: August 2018

Abstract
Enantiopure Boc-protected piperidine derivative (+)-5c, with a quaternary stereocenter, was obtained by copper-catalyzed, L-valine diethylamide-mediated Michael reaction. For determination of the absolute configuration, 5c was derivatized by cyclization with pyrrolidine/AcOH to give compound 6 with bicyclo[4.4.0]-constitution, deprotection of the amino function with TFA and subsequent reaction with 2-iodobenzoic acid to yield the crystalline bicyclic amide 7. X-ray crystallographic analysis confirmed the constitution of compounds 5c and 6 and established the (R) configuration of 7. Thus, starting Michael addition product (+)-5c has to be (S) configured, because an epimerization at the quaternary stereocenter is excluded. This result is in accordance with our working model of the Cu-catalyzed, auxiliary-assisted Michael reaction.
Reactions of 3-Chloropropeniminium Salts with Aminopyridines. Synthesis of N-Pyridylpyridinium and Pyrido[1,2-a]pyrimidinium Salts
Authors: Girreser Ulrich , Heber Dieter , Rostaie-Gerylow Mojgan , Schütt Martin 
Published: August 2018

Abstract
N-(Pyridyl)pyridinium salts 7 and 8 as well as 4-phenylpyrido[1,2-a]pyrimidinium salts 4 and 12 have been prepared by reactions of 3-aryl-3-chloropropeniminium salts 5 with aminopyridines (6) using glacial acetic acid as solvent. 2-Phenylpyrido[1,2-a]pyrimidinium salts 2 are formed when ethanol is used as the solvent. The condensation of 2-aminopyridine (6a) with 3-chloro-2,3- dehydromorpholino-2-carbiminium salt 13 is described. The HSAB principle of Pearson is discussed to explain the different regioselective ring closure reactions.
Cleavage of a Dibenzotetraazafulvalene to Yield a Rh(I) Carbene Complex
Authors: Hahn F. Ekkehardt , Fehren Thorsten von , Wittenbecher Lars , Fröhlich Roland 
Published: August 2018

Abstract
The reaction of the dibenzotetraazafulvalene C6H4(NC2H5)2C=C(NC2H5)2C6H4, 1 = 1, with [(COD)Rh(μ-Cl)2Rh(COD)] proceeds via cleavage of the C=C double bond and yields the carbene complex [(COD)RhCl(1)], 2. The X-ray structure analysis shows 2 to be a mononuclear complex with a rhodium(I) center coordinated in a slightly distorted square-planar fashion.
Iridoid and Phenylethanoid Glycosides from Phlomis nissolii and P. capitata
Authors: Kırmızıbekmez Hasan , Piacente Sonia , Pizza Cosimo , Dönmez Ali A. , Çaliș İhsan 
Published: August 2018

Abstract
A new iridoid glucoside, lamiidic acid was isolated from Phlomis nissolii, along with one known iridoid glucoside, lamiide and 13 phenylethanoid glycosides, verbascoside, isoverbascoside, leucosceptosides A and B, martynoside, arenarioside, forsythoside B, alyssonoside, lamiophlomiside A, samioside, integrifoliosides A and B, and hattushoside. A new iridoid glucoside, ipolamiidic acid was isolated from Phlomis capitata together with two known iridoid glucosides, lamiide and ipolamiide. The known phenylethanoid glycosides, isoverbascoside, forsythoside B, alyssonoside and hattushoside, a known lignan glycoside, liriodendrin, three flavonoid glycosides, luteolin 7-O- (6”-O-α-L-rhamnopyranosyl)-β -D-glucopyranoside, luteolin 7-O-(6”-O-β -D-apiofuranosyl)-β -Dglucopyranoside and chrysoeriol 7-O-β -D-glucopyranoside, an acyclic monoterpene, betulalbuside A, and a quinic ester derivative, chlorogenic acid were also obtained and characterized. The structures of the isolated compounds were elucidated by means of spectroscopic (HRESI-MS, 1D and 2D NMR) evidence.
Unprecedented Coordination Environment in Poly-{μ-bis(methylthienyltellane)( chlorido)(thienyl)platinum(II)}
Authors: Oilunkaniemi Raija , Laitinen Risto S. , Ahlgrén Markku 
Published: August 2018

Abstract
The reaction of methylthienyltellane TeMeTh (Th = thienyl, C4H3S) and [PtCl2(NCPh)2] affords in addition to the main product [PtCl2(TeMeTh)2], also small amounts of yellow crystalline [PtCl(Th)(TeMeTh)2]n that exhibits unprecedented quasi-octahedral coordination environment around platinum(II). There are four weak Pt-Te bonds of 2.898(1) and 3.419(1) Å forming an approximate squareplane the quasi-octahedral coordination being completed by a Pt-Cl bond of 2.400(2) Å and a Pt-C bond of 1.998(8) Å of a discrete thienyl ring. The TeMeTh acts as a bridging ligand. Tellurium shows a distorted tetrahedral coordination and the weak Pt-Te bonds can be rationalized in terms of sharing one tellurium electron lone-pair by two adjacent platinum centers. The closest contacts between the polymer chains involve thienyl rings.
Ethenetetracarbonitrile and Heterocyclization of Symmetrical Dithiobiurea as well as Thioureidoethylthiourea Derivatives
Authors: Hassan Alaa A. , Mourad Aboul-Fetouh E. , El-Shaieb Kamal M. , Abou-Zied Ashraf H. 
Published: August 2018

Abstract
N,N’-Disubstituted hydrazinecarbothioamides 6a - c and substituted thioureidoethylthioureas 12a - c react with ethenetetracarbonitrile (TCNE) in ethyl acetate or chlorobenzene to form the derivatives of pyrazole 7, 8; thiadiazole 10, 11 thiadiazepine 9, thiadiazepane 13, imidazolidine 14 and diazepine 15.
Metal Complexes of Biologically Important Ligands, CLV [1]. Some Derivatives of 4-Ethynylphenylalanine
Authors: Enzmann Armin , Beck Wolfgang 
Published: August 2018

Abstract
The benzoyl protected 4-ethynyl-L-phenylalanine methyl ester gives with octacarbonyldicobalt and ethylene-bis(triphenylphosphine)platinum(0) the complexes Co2(CO)6(HC≡CR) and (Ph3P)2 Pt(HC≡CR) (R = p-C6H4CH2CH(CO2Me)N(HCOPh).
The heterocumulene [Cp(Ph3P)2Ru=C=C(H)R]+BF4
− (R = p-C6H4CH2C(H)N(H)-Boc is formed from [Cp(Ph3P)2Ru]+BF4
− and N-t-Boc-4-ethynylphenylalanine methyl ester. The alkynyl bridged tetraamino acid with a tetraphenylmethane backbone C[p-C6H4C≡C-p-C6H4-CH2CH(CO2Me)NH-t- Boc]4 was synthesized from tetrakis(4-iodophenyl)methane and N-Boc-4-ethynylphenylalanine methyl ester by Sonogashira coupling.