bluuebunny/crossref_metadata_2025_split huggingface dataset:
Kinetic Study of Ligand Exchange Reactions of Bis(1,5-cyclooctadiene)nickel(0) with 2,2′-Bipyridine, 4,4′-Dimethyl-2,2′-bipyridine, and 4,4′,5,5′-Tetramethyl-2,2′-bipyridine
Authors: Abla Mahmut , Yamamoto Takakazu 
Published: May 2004

Abstract
Ligand exchange reactions of bis(1,5-cyclooctadiene)nickel(0), Ni(cod)2, with bpy, DMbpy, and TMbpy (bpy = 2,2′-bipyridine, DMbpy = 4,4′-dimethyl-2,2′-bipyridine, TMbpy = 4,4′,5,5′-tetramethyl-2,2′-bipyridine) in THF and DMF have been investigated kinetically. The reaction obeys the pseudo first-order kinetics, R = −d[Ni(cod)2]/dt = kobs[Ni(cod)2], with respect to the concentration of Ni(cod)2 in both the solutions. In THF, the kobs value linearly increases with [L] at a low concentration region of the exchanging ligand L; but it levels off at high concentrations of L and approaches a limiting value (e.g., about 1.0 × 10−4 s−1 at 25 °C). Addition of cod to the THF solution accelerates the exchange reaction. On the other hand, in DMF, the rate of the reaction (R) obeys the second-order rate law, R = k[Ni(cod)2][L], over a wide range of [L]. In DMF, the k value is independent of the concentration of cod added. Based on the kinetic results and NMR analysis, a reaction mechanism involving coordination of bpy, cod, or DMF to Ni(cod)2 to form a 20 e intermediate complex is proposed. DMbpy and TMbpy have a reactivity comparable to that of bpy in THF. In DMF, their reactivity increases in the order of bpy &lt; DMbpy &lt; TMbpy at 25 °C.
Aggregation, Complexation with Guest Molecules, and Mesomorphism of Amphiphilic Phthalocyanines Having Four- or Eight Tri(ethylene oxide) Chains
Authors: Kobayashi Nagao , Higashi Ryuji , Ishii Kazuyuki , Hatsusaka Kazuaki , Ohta Kazuchika 
Published: May 2004

Abstract
Zinc and metal-free amphiphilic phthalocyanines (pcs) substituted by four or eight tri(ethylene oxide) chains (3,6,9-trioxadecyloxy groups) {(H2(4EGpc), [Zn(4EGpc)], H2(8EGpc), and [Zn(8EGpc)] in Fig. 1)} have been prepared in order to study their aggregation in water, dioxane, and dioxane/water mixtures, their complexation phenomena with guest molecules in benzene, and mesomorphism in the neat state. In particular, tetra-substituted pcs have C4h symmetry and do not contain other positional isomers. [Zn(8EGpc)] forms aggregates in water and water–organic solvent mixtures; the extent of this was examined by electronic absorption and fluorescence spectroscopy. 1H NMR and fluorescence spectroscopy indicated that H2- and [Zn(8EGpc)] form inclusion complexes with quinones in benzene via hydrogen bonding. Benzoquinones with more hydroxy groups form complexes more effectively, plausibly laterally outside of the pc plane. From the higher field shift of the 1H singals of 2,2′-dihydroxy-1,1′-binaphthyl (BINAP) in the presence of [Zn(8EGpc)], BINAP molecules were suggested to lie above or below the pc plane. The mesomorphism of H2(8EGpc), [Zn(4EGpc)], and H2(4EGpc) was studied. In the case of H2(8EGpc), the discotic hexagonal ordered columnar (Dho) phase was seen in the range of from room temperature to 265 °C. However, liquid-crystalline phases were not observed for H2(4EGpc) and [Zn(4EGpc)].
Reductions of {RuNO}6-Type Nitrosyls. Characteristics of the Two-Electron Reduction Species Isolated as a Complex Having a Formally Negatively Charged μ-Nitrosyl ({RuNO}8–{RuNO}8) and the One-Electron Reduction Species Generated Electrochemically ({RuNO}7)
Authors: Nagao Hirotaka , Nagao Noriharu , Yukawa Yasuhiko , Ooyama Dai , Sato Yoshinobu , Oosawa Tohru , Kuroda Hiroshi , Howell Frank Scott , Mukaida Masao 
Published: May 2004

Abstract
The reaction between cis-[Ru(NO)(H2O)(bpy)2]3+ ({RuNO}6) and formic acid gives [{Ru(μ-NO)}2(bpy)4]2+ (2) ({RuNO}8–{RuNO}8), along with some other products species: cis-[Ru(NO)(OCHO)(bpy)2]2+ (1)({RuNO}6), and cis-[Ru(OCHO)(H2O)(bpy)2]+. The μ-nitrosyl complex (2) consists of two cis-Ru(bpy)2fragments connected by two formally negatively charged bridging nitrosyl ligands. Electrochemical study of the complex shows that two successive one-electron oxidation waves to give [{Ru(μ-NO)}2(bpy)4]4+({RuNO}7–{RuNO}7) are found. The generated two-electron oxidation species is disintegrated to afford a one-electron reduction species, cis-[Ru(NO·)(CH3CN)(bpy)2]2+ ({RuNO}7), along with a small amount of an unexpected nitro species, cis-[Ru(NO2)(CH3CN)(bpy)2]+. The characteristics of electrochemically generated one-electron reduction species cis-[Ru(NO·)X(bpy)2](n−1)+ ({RuNO}7) (X = H2O, OCHO) are investigated in the connection. During the degradation process of the one-electron reduction species, a nitrosyl-to-nitro conversion was found to proceed in cis-[Ru(NO·)(H2O)(bpy)2]2+, via the formation of cis-[Ru(NO·) (CH3CN)(bpy)2]2+ mentioned above; this is the first observation which explains the electrochemically-induced nitrosyl-to-nitro conversion observed in the reduction process of {RuNO}6-type complexes.
Substituent Effects on Fluorescent Properties of Imidazo[1,2-a]pyridine-Based Compounds
Authors: Tomoda Haruhiko , Hirano Takafumi , Saito Shojiro , Mutai Toshiki , Araki Koji 
Published: May 2004

Abstract
In order to search for novel fluorescent organic compounds, 20 derivatives of imidazo[1,2-a]pyridine (1) were synthesized, and their fluorescent properties were studied. Though the parent compound 1 (λfl = 370.5 nm, Φ = 0.57 in ethanol) was in the liquid state at ambient temperature, 2-phenylimidazo[1,2-a]pyridine (5), 2-(2-naphthyl)imidazo[1,2-a]pyridine (16), 7-methylimidazo[1,2-a]pyridine (3), 7-methyl-2-phenylimidazo[1,2-a]pyridine (12), and 7-methyl-2-(2-naphthyl)imidazo[1,2-a]pyridine (17) were found to give thermally stable solid compounds (mp 55—190 °C) without much affecting the fluorescent properties of the parent compound (λfl = 374—381 nm, Φ = 0.50—0.78 in ethanol). Among the 4′-substituted 2-phenyl derivatives, it was found that the introduction of the strong electron-donating amino and dimethylamino groups (2-(4-aminophenyl)imidazo[1,2-a]pyridine (7) and 2-[4-(dimethylamino)phenyl]imidazo[1,2-a]pyridine (8), respectively) caused marked red shift of their fluorescence (λfl = 445 and 446 nm, respectively, in ethanol), thus providing the way for tuning the fluorescence color of the IP derivatives. The observed red shift of the fluorescence of 7 and 8 was ascribed to the contribution of the excited intramolecular charge transfer state.
A 12-Porphyrin System: Syntheses of Peptide Porphyrins with Multiple Histidines and the Aggregation Behavior in the Presence of Hemin
Authors: Ushiyama Masato , Yoshino Atsushi , Yamamura Takeshi , Shida Yasuo , Arisaka Fumio 
Published: May 2004

Abstract
We succeeded in combining multiple-histidine peptides with porphyrins; that is to say, we synthesized three peptide porphyrins consisting of α4-meso-tetrakis(o-aminophenyl)porphyrin, α4-H2TAPP, and amphiphilic peptide, α4-(PepA18)n(AG)4−n-H2TAPP (n = 1, 3, and 4; PepA18 = EEALEKHEKALEKHEKAG), in the liquid phase. These compounds were designed to construct multiple porphyrin systems; in other words, each peptide attached on the H2TAPP was designed to contain two histidines. The stability of the porphyrins, (AG)4-H2TAPP and (AG)1(Boc-AG)3-H2TAPP, as well as the coupling conditions between the porphyrin fragments and the 16-residue peptide, EEALEKHEKALEKHEK, to give α4-(PepA18)n(AG)4−n-H2TAPP (n = 1, 3, and 4) were studied in detail with respect to the temperature, solvents, coupling reagents, additives, and amines. This search revealed that the combination of DMF/benzotriazol-1-yl-oxy-tris(pyrrolidino)phosphonium hexafluorophosphate (PyBOP)/N,N-diisopropylethylamine is suitable for the purpose. The search also clarified that it is possible to synthesize α4-(PepA18)4-H2TAPP and α4-(PepA18)3(AG)1-H2TAPP selectively by choosing the coupling additives 1-hydroxy-7-azabenzotriazole (HOAt) and 1-hydroxybenzotriazole (HOBt), respectively.
All of the compounds showed 40% helicity in a solution (phospate buffer, pH = 7.0) containing 2,2,2-trifluoroethanol (TFE). The UV-vis and circular-dichroism spectrophotometric titrations of Fe(III) protoporphyrin IX chloride, B, with α4-(PepA18)4-ZnTAPP, A, indicated that up to three equivalents of B were incorporated into A in a buffer solution containing 15% TFE. Sedimentation-equilibrium ultracentrifugation experiments showed that A is a dimer in the solution, and that this dimer is transformed to a trimer when B is incorporated into A. These results suggest that A achieves a 12-porphyrin system consisting of different kinds of metalloporphyrin.
Crystal Structures of Unsolvated Lithiosilanes with Si–Si Bonds
Authors: Nanjo Masato , Sekiguchi Akira , Sakurai Hideki 
Published: May 2004

Abstract
The molecular structures of lithiopentamethyldisilane ([LiSiMe2SiMe3]4, 1a), 2-lithio-1,1,2,3,3-pentamethyl-1,3-diphenyltrisilane ([LiSi(SiMe2Ph)2Me]2, 1b), and 2-lithio-1,1,1,3,3,3-hexamethyl-2-phenyltrisilane ([LiSi(SiMe3)2Ph]2, 1c) have been determined by X-ray diffraction. The silyllithium 1a is a tetramer in the solid state with intramolecular Li···CH3 agostic interactions. The silyllithiums 1b and 1c are dimers with intramolecular lithium-phenyl interactions. The latter adopts a molecular structure with not only an intramolecular Li–Ph interaction, but also an intermolecular Li···CH3 agostic interaction. The structures of these organometallic derivatives show novel features not observed in solvent-coordinated lithiosilanes. These features provide valuable insights into structures that differ markedly from those of lithiosilanes containing coordinated donor solvent molecules.
Guest-Exchange and Guest-Release via Gas–Solid Contact in Clathrate Crystals Based on 2,5-Bis(9-hydroxyfluoren-9-yl)thieno[3,2-b]thiophene as a Host Compound
Authors: Kuruma Koji , Nakagawa Hiro-o , Imakubo Tatsuro , Kobayashi Keiji 
Published: May 2004

Abstract
The host compound 2,5-bis(9-hydroxyfluoren-9-yl)thieno[3,2-b]thiophene (1) afforded clathrate crystals represented by the formula (1)(guest)2 for the guests EtOH, n-PrOH, and i-PrOH. Their X-ray crystal analyses revealed that the host frameworks are isostructural. The guest molecules, which are embedded in a channel-type of host void, were exchanged with other guest species by vapor contact. Upon exposure of these crystals to methanol vapor, guest elimination was induced to give the guest-free host 1 crystal [β-form, P1-, a = 13.111(4), b = 13.724(3), c = 9.766(3) Å, α = 97.11(2), β = 98.64(3), γ = 64.56(2)°, V = 1565.3(8) Å3]. The crystal thus obtained is a polymorphic form of the guest-free 1 crystal which is obtained by recrystallization from dichloromethane [α-form, P21/n, a = 17.403(3), b = 20.654(4), c = 8.695(1) Å, β = 99.73(1)°, V = 3080.4(9) Å3]. Once the guest molecules have been lost, gas-sorptive enclathration was not accomplished for either of these polymorphic host crystals; host 1 does not act as an apohost.
Catalytic Performance of Tantalum–η2-Alkyne Complexes [TaCl3(R1C≡CR2)L2] for Alkyne Cyclotrimerization
Authors: Oshiki Toshiyuki , Nomoto Hiroshi , Tanaka Kouji , Takai Kazuhiko 
Published: May 2004

Abstract
Structurally characterized tantalum–η2-alkyne complexes [TaCl3(η2-EtC≡CEt)L2] (1, L2 = 1,2-dimethoxyethane (DME); 2, L = py) acted as catalysts for the cyclotrimerization of terminal alkynes. The catalytic reaction proceeded at 25 °C within few hours and the trisubstituted benzenes were obtained without the formation of linear oligomers. A new tantalum complex having a terminal alkyne ligand, [TaCl3(η2-Me3SiC≡CH)(dme)] (3), was prepared, and its catalytic performance was also investigated.
Both Enantiomers of N-Boc-indoline-2-carboxylic Esters
Authors: Kurokawa Masayuki , Sugai Takeshi 
Published: May 2004

Abstract
An immobilized form of Candida antarctica lipase (Chirazyme L-2) catalyzed enantioselective hydrolysis (E &gt; 1000) of N-Boc-indoline-2-carboxylic acid methyl ester. The reaction proceeded efficiently at 60 °C, a temperature over the melting point of substrate, in the conversion of 49.9% to provide the hydrolyzed product, (S)-carboxylic acid with &gt;99.9% ee and the unreacted (R)-ester with 99.6% ee. A newly developed expeditious route to the racemic substrate (a total of six steps, 60% yield), starting from aniline and ethyl α-methylacetoacetate, established the scalable chemo-enzymatic synthesis of the desired compounds in both enantiomerically pure forms.
Ethyl Acetate as a Pro-Reducing Agent in an One-Pot Reductive Deamination of Nitroanilines
Authors: Bacherikov Valeriy A , Wang May-Jane , Cheng Shu-Yun , Chen Ching-Huang , Chen Kuo-Tung , Su Tsann-Long 
Published: May 2004

Abstract
The one-pot reductive deamination of mono or dinitro substituted anilines to the corresponding nitrobenzenes by using ethyl acetate or ethanol was compared. It revealed that ethyl acetate is more suitable for the reductive deamination of mononitroanilines, while ethanol is more appropriate for dinitroanilines.
Evidence of the Hypsithermal Verified Using the Racemization Rate Constant of Amino Acids: An Estimation of Paleo-Ground Temperatures
Authors: Takano Yoshinori , Kudo Junya , Kaneko Takeo , Kobayashi Kensei , Ishikawa Yoji , Marumo Katsumi 
Published: May 2004

Abstract
The kinetics of a racemization reaction for aspartic acid in boreal terrestrial sediment core samples was investigated in detail to determine the rate constant (kASP) and the difference of the paleo-ground temperatures. The Arrhenius plot between the rate constant (kASP) and the literature data of corresponding temperatures is defined as
Log kASP = 16.1 − 5820/T
where T is the absolute temperature (K). From the beginning of the Holocene, estimated annual ground temperatures increased to reach the warmest period, after which a slight decrease was observed. The present findings are geologically consistent with the global transgression period called “the Hypsithermal”.
The Synthesis of (±)-Monomorine I Starting with the Palladium-Catalyzed Carbonylative 1,4-Acylation of an Organozinc Chloride
Authors: Yuguchi Motoki , Tokuda Masao , Orito Kazuhiko 
Published: May 2004

Abstract
The synthesis of the indolizidine alkaloid (±)-monomorine I has successfully been achieved by a new route starting with a one-pot four-component connecting reaction based on a palladium-catalyzed carbonylative 1,4-addition of an organozinc halide to a α,β-enone in an atmosphere of carbon monoxide.
Reduction of Light-Decomposition and Enhancement of Photocatalysis of Photocatalyst by Au-Coat
Authors: Nemoto Yoshihiro , Hirai Takayuki 
Published: May 2004

Abstract
A photocatalyst can be used for various applications. Such materials are semiconductors which are stable to photoirradiation, for example, TiO2. Most of these materials require UV light. There are many kinds of semiconductors which are unstable to photoirradiation, but which have a visible light response. In this study, it is shown that a thin Au film or Au nano particles on the surface of the photocatalyst reduced the photodecomposition of the photocatalyst. Although the surfaces of the samples were completely covered by Au, photocatalytic activity was observed in all the Au-coated samples. The Au-coating on the surface enhances the photocatalysis of a coated photocatalyst.
The Radiation-Induced Coloration of Amorphous Photochromic Dithienylethene Films
Authors: Irie Setsuko , Kim Myeong-Suk , Kawai Tsuyoshi , Irie Masahiro 
Published: May 2004

Abstract
The radiation-induced coloration of bulk amorphous films of five photochromic diarylethenes was studied with the aim of developing reusable, sensitive color dosimeters. The films contain an extremely high concentration of diarylethenes. The most intense coloration was observed for the film containing 1,2-bis(2,4-dimethyl-3-thienyl)perfluorocyclopentene having 3-phenyl-4-diphenylyl substituents. The color disappeared upon irradiation with visible light. The coloration increased linearly with an increase in the absorbed dose up to 3000 Gy. The relative sensitivity of radiation-induced coloration among the five derivatives qualitatively agreed with the sensitivity of photo-induced coloration from UV light (254 nm) irradiation.
Evolution of Synthetic Strategies for Highly Functionalized Natural Products: A Successful Route to Bryostatin 3
Authors: Ohmori Ken 
Published: May 2004

Abstract
A convergent asymmetric synthesis of the antineoplastic marine macrolide, bryostatin 3 (1), has been achieved. This synthesis relied upon stereo-controlled construction of two major fragments, the top-half fragment 2 and the bottom half fragment 3, and their coupling by the Julia–Lythgoe olefination and Yamaguchi macrolactonization. The top-half fragment 2 could successfully be synthesized by tandem connection of the three key fragments. The bottom-half fragment 3 was prepared by the union of vinyl iodide 39 and α-alkoxy aldehyde 30.
Cause for Unusually Large Thermal Hysteresis of Spin Crossover in [Fe(2-pic)3]Cl2·H2O
Authors: Nakamoto Tadahiro , Bhattacharjee Ashis , Sorai Michio 
Published: May 2004

Abstract
Thermodynamic properties of an iron(II) spin crossover complex [Fe(2-pic)3]Cl2·H2O (2-pic: 2-picolylamine or 2-aminomethylpyridine), for which an unusually large thermal hysteresis with a width of [Tc(↑) − Tc(↓) = 91 K] in its spin-state transition has been observed by 57Fe Mössbauer spectroscopy, were investigated by adiabatic heat capacity calorimetry. Contrary to the previous observation, the preliminary DTA result showed much smaller thermal hysteresis around 200 K, with a width of [Tc(↑) − Tc(↓) = 12 K]. The present heat capacity measurement by adiabatic calorimetry revealed that there exists a metastable low-spin low-temperature phase, besides the stable low-spin low-temperature phase and that this complex undergoes stabilization from the metastable low-spin phase to the stable low-spin phase accompanied by a large heat evolution when the sample is annealed around 200 K. The stable low-spin phase exhibited a phase transition to the high-spin high-temperature phase around 280 K upon heating. The high-spin state was found to be always undercooled down to ∼200 K. The large thermal hysteresis earlier reported for the title complex turns out to be apparent and is caused by the existence of the metastable low-spin phase. Moreover, another intermediate metastable (low-spin?) phase was found when the sample in the metastable low-spin phase was heated from 150 K at a heating rate of ∼5 K h−1. This metastable phase exhibited a phase transition to the undercooled high-spin phase at ∼265 K.
Single-Crystalline Photochromism of a Diarylethene Dimer
Authors: Kobatake Seiya , Kuma Shunpei , Irie Masahiro 
Published: May 2004

Abstract
A fluorene derivative having two diarylethene units at the 9,9′-positions was synthesized, and the photochromic behavior was examined in a single-crystalline phase as well as in solution. Upon irradiation with ultraviolet light (λ = 313 nm), a hexane solution of the diarylethene dimer (1a) turned blue. The blue solution was found to contain the one closed-ring form dimer (1b) and the two closed-ring form dimer (1c). Both 1b and 1c returned to 1a upon irradiation with visible light (λ &gt; 500 nm). The photocyclization quantum yields of 1a to 1b and 1b to 1c were determined to be 0.46 and 0.29, respectively. The photocycloreversion quantum yields of 1c to 1b and 1b to 1a were 5.8 × 10−3. The single crystal of the dimer exhibited photochromism. The diarylethene chromophores were aligned almost perpendicular to each other in the crystal, and one of the units in the dimer could be selectively isomerized by irradiation with linearly polarized light.
Spectroscopic Observation of the Dimerization Reactions of the 9-Phenylcarbazole Cation Radical in Acetonitrile
Authors: Oyama Munetaka , Matsui Jun 
Published: May 2004

Abstract
The dimerization reaction processes of the 9-phenylcarbazole cation radical (PCZ•+) in acetonitrile (AN) were observed using an electron-transfer stopped-flow method. Although the lifetime of PCZ•+ in AN is less than a few hundred milliseconds, the dynamic transformation of the absorption spectra of PCZ•+ was successfully observed in AN for the first time with the proposed method. By observing the changes in the absorption spectra in the visible region, the decrease in PCZ•+ and the concurrent increase in the dimer cation radical were observed with isosbestic points. In addition, in the presence of neutral PCZ, the acceleration of the dimerization of PCZ•+ was clearly confirmed. Consequently, in the presence of PCZ, the rate law was determined to be −d[PCZ•+]/dt = 3Kk′[PCZ•+]2[PCZ], where 3Kk′ is 1.4 × 109 M−2 s−1. This means that the reaction mechanism involves a two-step interaction with the catalytic effect of neutral PCZ. Although the difference in the reactivity had already been known between PCZ•+ and the triphenylamine cation radical, the reaction mechanism has been clarified to be different in both cases.
A Reaction Network for Triglycine Synthesis under Hydrothermal Conditions
Authors: Mitsuzawa Shigenobu , Yukawa Tetsuyuki 
Published: May 2004

Abstract
It has been hypothesized that chemical evolution leading to the origin of life might have occurred in hydrothermal environments on primitive Earth. To examine this hypothesis, we investigated how the polymerization of amino acids proceeds under high-temperature and high-pressure conditions. We investigated a reaction network consisting of glycine and oligoglycines up to trimer, and the condensation/hydrolysis reactions among these molecules. We determined the rate constants of these reactions in experiments employing a flow reactor at 200 °C and 25 MPa. We found that two condensation reactions of glycine, which yield diglycine and diketopiperazine as products, have larger equilibrium constants under these conditions than at 25 °C. This result supports the hypothesis that hydrothermal conditions are thermodynamically favorable for chemical evolution. We also found that triglycine formation is mediated by diketopiperazine at 200 °C and 25 MPa. This implies that diketopiperazine acts as an important intermediate in the polymerization process of amino acids, which might have occurred in hydrothermal environments on primitive Earth.
Crystal Structure and Ionic Conduction Mechanism of AgHgSX (X = Br, I)
Authors: Moro’oka Masakazu , Ohki Hiroshi , Yamada Koji , Okuda Tsutomu 
Published: May 2004

Abstract
New Ag+ ionic conductors AgHgSX (X = Br, I) were synthesized by solid-state reactions of AgX (X = Br, I) and HgS. AgHgSI shows a phase transition at 578 K. The crystal structure of the high temperature phase has been determined to be P212121 (No. 19) by the Rietveld refinement using the powder X-ray diffraction pattern. The electric conductivity at 500 K measured by the AC impedance method was 2.6 × 10−4 S cm−1 for the high temperature phase of AgHgSI, 1.2 × 10−4 S cm−1 for the low temperature phase of AgHgSI, and 1.1 × 10−4 S cm−1 for AgHgSBr. The charge density analysis of the AgHgSX (X = Br, I) clearly showed the Ag+ ionic conduction path when analyzed by the Maximum Entropy Method (MEM) combined with Rietveld analysis.
Preparations of Low-Spin Tetra Cyano Iron Complexes of N-Benzyl-1,2-ethanediamine and Its Oxidative Dehydrogenation: Isolation of the Intermediate with Monoimine Ligand
Authors: Goto Masafumi , Ohse Yasuhiko , Koga Sayuri , Kudo Yuka , Kukihara Rinko , Kurosaki Hiromasa 
Published: May 2004

Abstract
The oxidation of tetracyano(N-benzyl-1,2-ethanediamine) with one equivalent oxidant, hydrogen peroxide or peroxodisulfate, under neutral or basic conditions yielded tetracyano(2-benzylimino-ethylamine)ferrate(II), owing to an acceleration of disproportionation by the presence of N-benzyl substituents. Further oxidation yielded the corresponding conjugated 1,2-diimineferrate(II) complex.