bluuebunny/crossref_metadata_2025_split huggingface dataset:
Mechanism of the Optical Activation of α-Substituted Carbonyl Compounds via Optically Active Immonium Salts
Authors: Matsushita Hajime , Tsujino Yasuko , Noguchi Masao , Yoshikawa Sadao 
Published: July 2006

Abstract
The degree of the optical activations of racemic α-substituted carbonyl compounds via the formation of optically active immonium salts and the subsequent hydrolysis were largely affected by acids used for the hydrolysis of the enamines. The ratio of the diastereomeric immonium salts depends on the temperature. There is a relationship between the configuration of the optically activated carbonyl compounds and those of amines used. These suggest that the optical activation is due to the asymmetric transformation.
Thermal Separation Column with Vertical Barriers. I. Analytical Studies on the Thermal Separation Column Having Vertical Barriers
Authors: Sasaki Kazuo , Yoshitomi Tsutomu , Miura Norio 
Published: July 2006

Abstract
The effect of installing a couple of vertical flow barriers inside a double cylinder-type thermal separation column has been studied analytically. The method of analysis is entirely similar to that developed by Jones and Furry. The only change is that an additional parameter, which specifies the location of the barriers, has been introduced. The results indicated that the installation of barriers retards the convectional velocity and leads to a remarkable increase in the equilibrium separation. With the optimum design, which is achieved by locating barriers at 5/8 parts of the half-width of the wall spacing, the logarithmic equilibrium separation will become 4 times greater than that in the open column.
Reactions of Transition Metal Dihydrides. VII. Further Investigations on Charge-Transfer Interaction between σ-Basic Metal Hydrides and Organic π-Acceptors
Authors: Nakamura Akira , Otsuka Sei 
Published: July 2006

Abstract
Charge transfer (CT) absorptions between transition metal polyhydrides, e.g. MH2Cp2 (Cp=η-C5H5; M=Mo, W), FeH2(dppe)2, MH4(dppe)2(dppe=Ph2PCH2CH2PPh2; M=Mo, W), and organic π-acceptors such as maleic anhydride were measured. The position of the CT bands gave an Ip value of 6.3 eV for WH2Cp2. The value indicates transfer of electron from the filled non-bonding metal orbital to the acceptors. Role of the electron donor-acceptor interactions prior to insertion or substitution of transition metal hydrides is discussed.
Synthesis of 3′-Deoxykanamycin B (Tobramycin)
Authors: Takagi Yasushi , Miyake Toshiaki , Tsuchiya Tsutomu , Umezawa Sumio , Umezawa Hamao 
Published: July 2006

Abstract
3′-Deoxykanamycin B (tobramycin) was prepared from kanamycin B. 3′,4′:4″,6″-Di-O-cyclohexylidene derivative (2) of penta-N-ethoxycarbonylkanamycin B was 2″-O-benzoylated and the 3′,4′-O-cyclohexylidene group was selectively and quantitatively removed by treatment with 1 mol equivalent of water in N,N-dimethylformamide (DMF) to give the de-3′,4′-O-cyclohexylidene derivative (4). Regioselective tosylation in pyridine at −20 °C gave the 3′-O-tosyl derivative (5) in 70% yield. Despite the 1,3-diaxial interaction in the transition state, replacement of the tosyl group with iodide was successfully performed in high yield with NaI in DMF. Hydrogenolysis of the iodo derivative (6) and subsequent removal of the protecting groups gave 3′-deoxykanamycin B (10) in ≈25% overall yield from kanamycin B. Confirmation of the 3′-deoxy group was performed by measurement of Δ[M]TACu of 3′-deoxyneamine which was obtained from 10 by hydrolysis.
Thermal Separation Column with Vertical Barriers. II. Performance of a Thermal Separation Column with Vertical Barriers
Authors: Sasaki Kazuo , Miura Norio , Yoshitomi Tsutomu 
Published: July 2006

Abstract
The performance of a newly designed thermal separation column has been examined. The apparatus was constructed along the line of mathematical analysis developed in the preceding paper. The column was basically composed of two coaxial cylinders inside of which two additional cylinders of fine stainless steel screen were installed to control the gas flows in the column. An equimolar mixture of argon and nitrogen was used as the test gas. A definite improvement in the magnitude of equilibrium separation was demonstrated in accordance with the theory. In addition, the rate of attainment of steady state was found not so much different from that with open column when temperature exceeded 140 °C or more.
Direct Observation of Dienol Intermediates in Photochemical Deconjugation of an α,β-Uusaturated Ketone. Photoisomerization of 1-Acetylcyclooctene
Authors: Noyori Ryoji , Inoue Hiroshi , Katô Masao 
Published: July 2006

Abstract
The photolysis of 1-acetylcyclooctene in acetonitrile solution leads to 3-(α-hydroxyethylidene)cyclooctene (two stereoisomers). Structures of the stable 1,3-dienols have been elucidated on the basis of their spectral data and chemical behavior. The dienols are highly air-sensitive. Upon heating, or by the action of an acid or base, they are converted to 3-acetylcyclooctene. In methanol-O-d, 3-acetylcyclooctene-3-d is formed. These findings provide the first, unambiguous evidence for the intervention of 1,3-dienol intermediates in photochemical deconjugation of an α,β-unsaturated ketone into the β,γ isomer.
Studies of the π,π* Absorption Bands of 2,6-Dimethyl-4-pyrone
Authors: Kuboyama Akira , Sato Yoshikuni , Arano Hiroshi 
Published: July 2006

Abstract
The π,π* S-S absorption spectra of 2,6-dimethyl-4-pyrone in solutions up to the vacuum UV region were obtained. Based on the results of the MO calculations, the assignment and characterization of the observed π,π*, bands were studied, together with the assignment of the π,π* bands near 250 nm of 4-pyrone.
Photochemical Addition Reactions of Methanol and Ethanol to 1,4-Diaminoanthraquinone
Authors: Yamada Kimiho , Shosenji Hideto , Fukunaga Seiki , Hirahara Kazuyoshi 
Published: July 2006

Abstract
Photochemical reactions of 1,4-diaminoanthraquinone in methanol and/or ethanol yielded solvent adducts, 4a and 4b. The reactions proceeded via an upper triplet state. The quantum yields were 0.013–0.019 at 280 nm.
Effects of Quinones on the Protonation Reaction of TCNQ Anion Radical; The Role of a Protonated Quinone as a Strong Electron Acceptor
Authors: Yamagishi Akihiko , Yamada Mutsuo 
Published: July 2006

Abstract
Various kinds of substituted p-benzoquinones (Q) have been found to accelerate the rate of the reaction between 7,7,8,8-tetracyanoquinodimethane(TCNQ) anion radical and hydrogen chloride in acetonitrile. The stoichiometry of the reaction is altered by the presence of Q from 2TCNQ\ewdot+2H+=TCNQ+H2TCNQ to 2TCNQ\ewdot+2H++Q=2TCNQ+QH2. In case of p-benzoquinone, the rate of the disappearance of TCNQ\ewdot is expressed by v=k[TCNQ\ewdot] [Q] [H+], where k=3.0×108 M−2 s−1 at 8 °C. From these results, it is concluded that a protonated quinone QH+ is an active species which accepts an electron from TCNQ\ewdot.
Photo-induced Reaction of 2-Alkoxy-3-bromo-1,4-naphthoquinones with Acetylenes: Formation of 2-Aryl-substituted Naphtho[2,3-b]furan-4,9-diones
Authors: Otsuki Tetsuo 
Published: July 2006

Abstract
2-Aryl-substituted naphtho[2,3-b]furan-4,9-diones 3 were obtained as a major product in the photo-chemical reaction of 2-alkoxy-3-bromo-1,4-naphthoquinones with acetylenes.
Solid-State Circular Dichroism Spectra of Tris(diamine)cobalt(III) Complexes: Decomposition into E and A2 Components
Authors: Kuroda Reiko , Saito Yoshihiko 
Published: July 2006

Abstract
Solid-state circular dichroism spectra of some tris(diamine) cobalt(III) complexes were measured. Each CD band region was decomposed into E and A2 components by combining the CD spectra in uniaxial single-crystals and in microcrystalline states. The observed values of R(E) and R(A2) were compared with the theoretical calculation of Mason and Seal based on dynamic coupling method. The agreements are generally good for those complexes with five-membered chelate rings, however, there are some discrepancies for six- and seven-membered chelate ring cases.
Magnetic Circular Dichroism of the Iron(III) Porphins
Authors: Kobayashi Hiroshi , Higuchi Tadatoshi , Eguchi Ken 
Published: July 2006

Abstract
Magnetic circular dichroism (MCD) spectra were measured of some low-spin and high-spin Fe(III) porphins in a rigid matrix of polymethyl methacrylate(PMMA) for a variety of temperature. Some of the most prominent MCD, extrema of the low-spin Fe(III) porphins showed a remarkable enhancement of the intensity at reduced temperatures, while no appreciable increase was observed in the absorption intensity. The temperature dependence of the MCD dispersion of the low-spin Fe(III) porphins arises, in principle, from a change in the Boltzmann distribution between the ground Kramers doublet splitting in a magnetic field, however, the MCD enhancement observed in the Soret region can correctly be interpreted only when the excited states described by a product wave function of the porphin B state and the spin-orbit coupling substates of low-spin iron(III) d5 system are split by a configuration interaction with the “porphin to iron(III)” charge-transfer excited states.
Vibrational Spectra and Rotational Isomerism of Alkyl Vinyl Ethers
Authors: Sakakibara Masaaki , Inagaki Fuyuhiko , Harada Issei , Shimanouchi Takehiko 
Published: July 2006

Abstract
The rotational isomerism of methyl vinyl ether, ethyl vinyl ether, and n-butyl vinyl ether has been studied by means of the vibrational spectra and normal frequency calculations. The enthalpy difference between the skew and cis isomers in the liquid state of methyl vinyl ether has been determined to be 1440±160 cal/mol. Series of C–O torsional transitions in the cis well have been observed for methyl vinyl ether and methy-d3 vinyl ether in the region near 230 cm−1 and analyzed. It has been concluded for ethyl vinyl ether that the cis-trans form (CT) is stable in the solid state and that three forms, CT, SG′, and ST, coexist in the liquid and gaseous states. The spectra in the solid state of n-butyl vinyl ether are consistent with the calculated frequencies of the CTTT form.
Metal Complexes of Amino Acids. IX. Carbon-13 Nuclear Magnetic Resonances of Cobalt(III) Complexes
Authors: Ama Tomoharu , Yasui Takaji 
Published: July 2006

Abstract
The 13C NMR spectra of cobalt(III) complexes containing various amino acids as unidentate or bidentate ligands were measured. The relation between the coordination types and the changes of the chemical shifts was clarified. The changes of chemical shift on coordination of α-amino acid to cobalt(III) (NH3+–R–COOH→NH3+–R–COOCo) were about 7 and 1 ppm for the carboxy-carbon and α-carbon, respectively. On the other hand, those on chelation (NH3+–R–COOH→chelated amino acid) were about 15 and 5 ppm for each carbon, respectively. However, the changes of chemical shift on chelation of β-alanine were different from those of α-amino acids.
Photooxygenation of α,β- and β,γ-Unsaturated Enamines in 17-(1-Formylethyl)etiojervanes
Authors: Murai Akio , Sato Chizuko , Sasamori Hiroshi , Masamune Tadashi 
Published: July 2006

Abstract
Photooxygenation of α,β(13,17)- and β,γ(12,13)-unsaturated morpholine enamines (I and II) in 17-(1-formylethyl)etiojervanes by singlet oxygen was carried out under irradiation with fluorescent bulbs. Oxidation of the former (I) afforded the corresponding α,β-unsaturated ketone (III) as the only product which could be isolated, while that of the latter gave two products, one (IV) being a normally oxidized β,γ-unsaturated ketone and the other (VIII) an α,β-unsaturated ketone with the D-ring contracted. Compound (VIII) was not obtained by treatment of IV under the same photooxygenation conditions as for II, indicating that the formation of VIII would not involve IV as an intermediate.
Photochemical Cycloaddition Reactions of α,β-Unsaturated Lactones with Olefins, and Application to Synthesis of Natural Products
Authors: Kosugi Hiroshi , Sekiguchi Shizuo , Sekita Ryû-ichi , Uda Hisashi 
Published: July 2006

Abstract
The photochemical cycloaddition reactions of five- and six-membered α,β-unsaturated lactone derivatives with unsaturated substrates (ethylene, acetylene, 1,1-dimethoxyethylene etc.) have been studied. The parent α,β-unsaturated lactone (γ-crotonolactone) and the β-,γ-, or δ-alkyl substituted derivatives add to ethylene and acetylene in the acetone solutions and to 1,1-dimethoxyethylene in the benzene solutions in so good yields as to utilize them practically for synthesis. α-Phenyl-γ-crotonolactone and β-phenyl-γ-crotonolactone also add to ethylene and acetylene, whereas, α-methyl, β-hydroxy, and β-methoxy derivatives do not. As the synthetic applications of the reactions, the synthesis of (±)-grandisol has been achieved, and the synthetic approach to (±)-canadensolide has also been described.
Chemistry of Nitrosoimines. XIV. Photolysis of 5-Nitrosoimino-4-phenyl-3-phenylimino-1,2,4-thiadiazolidine
Authors: Akiba Kin-ya , Tsuchiya Tohru , Fukawa Isaburo , Inamoto Naoki 
Published: July 2006

Abstract
Photolysis of 5-nitrosoimino-4-phenyl-3-phenyliraino-1,2,4-thiadiazolidine proceeded through π-π* excitation and gave phenylcyanamide and 5-imino-4-phenyl-3-phenylimino-1,2,4-thiadiazolidine as primary products. It was found that other products were produced by the reactions of the primary products. The formation mechanisms have been discussed briefly.
A Study of Catalysis by Metal Phosphate. III. The Dehydrogenation of Alcohols over Cadmium Phosphate and the Influence of CCl4 Addition on the Catalytic Reaction
Authors: Nozaki Fumio , Iimori Yutaka 
Published: July 2006

Abstract
Various alcohols were selectively dehydrogenated over the Cd3(PO4)2 catalyst. The addition of CCl4 during the reaction resulted in a rapid decrease in dehydrogenation activity and in an increase in dehydration activity, accompanied by an evolution of CO2.
Synthetic Reacions by Complex Catalysts. XXXVIII. A New Preparation of Copper(I) Isocyanate(Alkyl Isocyanide) and Its Reactions
Authors: Ito Yoshihiko , Inubushi Yoshinori , Matsumura Shun-ichi , Saegusa Takeo 
Published: July 2006

Abstract
Reaction of ethyl carbamate with Cu2O in the presence of t-butyl isocyanide produces copper (I) isocyanate (t-butyl isocyanide) complex, Cu(NCO)(t-C4H9-NC)2.5 (1), in 93% yield. Complex 1 is also produced in high yield by the reaction of ethyl N-trimethylsilylcarbamate with Cu2O in the presence of t-butyl isocyanide. Complex 1 reacts with alkyl halides in alcohols and with acyl chlorides to afford N-alkylcarbamate (2) and acyl isocyanate (3), respectively, in moderate yields.
The Acidities of Substituted α-Phenylsulfinylacetophenones
Authors: Kunieda Norio , Fujiwara Yoichi , Nokami Junzo , Kinoshita Masayoshi 
Published: July 2006

Abstract
The acidities of eleven meta- and para-substituted α-phenylsulfinylacetophenones (1) were determined potentiometrically in a 50% ethanol solution. pKa values (10.22–12.01) which can be nicely correlated with Hammett’s σ-values were obtained.
Dynamic Behavior of Acetylacetonato, Triphenylphosphine and Alkyl Ligands in NiR(acac)(PPh3)n (R=C2H5, CH3) in Solution and Disproportionation of the Alkylnickel Complexes in Pyridine
Authors: Yamamoto Takakazu , Saruyama Toshio , Nakamura Yoshiyuki , Yamamoto Akio 
Published: July 2006

Abstract
Dynamic behavior of acetylacetonato (acac), triphenylphosphine (PPh3) and ethyl (in the case of 1) ligands of NiR(acac)(PPh3)n (R=C2H5, n=1 (1); R=CH3, n=2 (2)) in solution has been studied. PPh3 ligand(s) in 1 and 2 exchange rapidly on NMR time scale with free PPh3 in solution. Addition of excess PPh3 makes the exchange rate much faster and an SN2 mechanism is proposed to explain the acceleration effect. 31P-NMR spectrum of 1 in pyridine shows that the PPh3 ligand is replaced by the solvent molecule. Acac ligands in 1 and 2 also undergo rapid interchange on NMR time scale. The activation energy for the acac interchange is about 10 kcal/ mol. On standing a specifically deuterated ethylnickel complex, Ni(CH2CD3)(acac)(PPh3) 1-d3 in solution, the hydrogens and deuteriums in the ethyl group were scrambled. Appearance of the methyl proton signals in the 1H-NMR spectrum of the deuterated ethylnickel complex after the treatment in solution demonstrates the occurrence of the H–D scrambling in solution. Both 1 and 2 undergo disproportionation reactions in pyridine. The rate of the disproportionation is second-order with respect to the concentration of 2.
The Crystal and Molecular Structure of Zinc Complex of 2-Chlorobenzoic Acid. II. The Crystal and Molecular Structure of μ3-Hydroxo-tri-μ-(2-chlorobenzoato)dizinc(II) Dihydrate
Authors: Nakacho Yoshifumi , Misawa Takeshi , Fujiwara Takaji , Wakahara Akio , Tomita Ken-ichi 
Published: July 2006

Abstract
C21H12O6Cl3Zn2OH·2H2O crystallizes in the monoclinic space group P21/c: a=12.779, b=23.732, c=14.749 Å, β=147.98°, and Z=4. The structure was determined by the usual heavy atom method and refined to R=0.039. The complex forms polymeric complex chains in the crystalline state. The ligands around two independent zinc atoms form an unusual trigonal bipyramid and an octahedron, respectively; the coordination geometry apparently differs from that found in the crystal structure of bis(2-chlorobenzoato) zinc(II). The correlation between coordination geometry and catalytic action of zinc atom is also discussed.
The Radiolysis of Anthraquinone Dye in Aqueous Solutions
Authors: Suzuki Nobutake , Nagai Takeshi , Hotta Hiroshi , Washino Masamitsu 
Published: July 2006

Abstract
The decoloration yields of an Acid Blue 40 neutral aqueous solution, G(-Dye), obtained from the optical density at 610 nm for the nitrogen-, oxygen-, and N2O-saturated solutions, equaled 0.18, 0.29, and 0.51 in the respective early stages. In view of the effects of NCS− and NO3− on the G(-Dye), the decoloration is attributable to the attacks of the OH radicals and hydrated electrons on the dye. The rate constants for the reactions of the OH radical and the hydrated electron with Acid Blue 40, obtained from competition reactions with various additives, were (6.6±1.2)×109 M−1s−1 and 1.5×1010 M−1s−1 respectively. In the nitrogen-saturated solutions, the G(-Dye) increased markedly upon the addition of alcohols–for example, up to 1.25 upon the addition of 2 mM butyl alcohol. In this case, at the same time, a new absorption band which is attributable to the formation of the reduction products by the attacks of the hydrated electrons and alcohol radicals on the dye appeared at 460–490 nm. This new absorption band disappeared slowly in the presence of oxygen; the rate of this disappearance was 2.8×10−5s−1. On the other hand, in the oxygen-saturated solutions, the G(-Dye) decreased markeld upon the addition of even a small amount of alcohol.
Optical Activity of Biphenyl Derivatives: The π–π* and n-π* Transitions of o,o′-Dinitrobiphenyls
Authors: Hanazaki Ichiro 
Published: July 2006

Abstract
The optical rotatory power for the lower electronic transitions of several o,o′-dinitrobiphenyl derivatives is examined on the basis of a theoretical method previously developed and applied to metal chelate compounds and binaphthyl derivatives. The theoretical energy, absorption intensity, and rotational strength are shown to be in reasonable agreement with the observed absorption and circular dichroism spectra, confirming the applicability of the theory to the optical activity of this simple type of dissymmetric molecules. In addition, the origin of the rotational strength for the n-π* transition is examined in detail. The results indicate that the n-π* transition gains its intensity and rotatory power through the interaction of the nonbonding electrons in a nitro group with the π electron system in the other nitrobenzene ring.
Hydration of Pyridine Bases in Benzene
Authors: Hirose Katsumi , Tanaka Motoharu 
Published: July 2006

Abstract
Hydration of pyridine bases in benzene has been studied by partition at 25 °C, the total concentration of pyridine bases being less than 1.0 M in benzene. The studied pyridine bases include pyridine, 2-methylpyridine, 4-methylpyridine, 2,6-dimethylpyridine, 3,5-dimethylpyridine, 2,4,6-trimethylpyridine, 2-chloropyridine, 2-bromopyridine, 3-bromopyridine and 2,6-dibromopyridine. Hydrated species with different composition are formed: the composition of the hydrated species (base to water ratio) is as follows: (1 : 2) for 2,6-dibromopyridine, (1 : 1) and (1 : 2) for 2-chloro- and 2-bromopyridine, (1 : 1) and (2 : 1) for 3-bromopyridine, (1 : 1), (1 : 2) and (2 : 1) for 4-methylpyridine and pyridine itself, and (1 : 1), (1 : 2), (2 : 1) and (2 : 2) or (2 : 3) for the other methyl derivatives. A linear free energy relationship has been observed between the hydration in benzene for the monomer monohydrate and the protonation in water of the corresponding base.
Molecular Structures of 5-Thiabicyclo[2.1.1]hexane and 7-Thianorbornane as Studied by Gas Electron Diffraction
Authors: Fukuyama Tsutomu , Oyanagi Kazuko , Kuchitsu Kozo 
Published: July 2006

Abstract
Molecular structures of 5-thiabicyclo[2.1.1]hexane and 7-thianorbornane (7-thiabicyclo[2.2.1]heptane) were studied by gas electron diffraction. For 7-thianorbornane the rotational constants obtained by Hirota et al. by microwave spectroscopy were also taken into account. Least-squares analyses gave the following rg bond distances and valence angles (rα for 5-thiabicyclo[2.1.1]hexane and rav for 7-thianorbornane): for 5-thiabicyclo[2.1.1]hexane, (C1–C2, C2–C3)av=1.539±0.016 Å, C1–C6=1.564±0.024 Å, C–S=1.865±0.004 Å, (C–H)av=1.110±0.008 Å, ∠C–S–C=69.5±0.6 ° and the dihedral angles (C1SC4)-(C1C2C3C4)=115.2±1.7° and (C1C6C4)-(C1C2C3C4)=116.1±2.4°; for 7-thianorbornane, C1–C2=1.538±0.006 Å, C2–C3=1.561±0.015 Å, C–S=1.837±0.004 Å, (C–H)av=1.115±0.008 Å, ∠C–S–C=80.2±0.8 °, the dihedral angle (C1C2C3C4)-(C4C5C6C1)=115.0±1.2° and ∠C1H–C–H=106±5°. The uncertainties represent the estimated limits of experimental error. The C–S bond length in 5-thiabicyclo[2.1.1]hexane is longer than that in dimethyl sulfide by 0.06 Å and that in 7-thianorbornane by 0.03 Å. The C–S–C angle in 5-thiabicyclo[2.1.1]hexane is smaller than that in dimethyl sulfide by about 30° and that in 7-thianorbornane by about 11°. The C1–C6 bond in 5-thiabicyclo[2.1.1]hexane is longer than the weighted average of the C1–C2 and C2–C3 bond lengths. The C1–C2 bond in 7-thianorbornane is longer than the C2–C3 bond.
Effect of Temperature on the Infrared Spectroscopic Parameters of Hydrogen Bonds between Some Phenols and Nitrites
Authors: Jawed Inam 
Published: July 2006

Abstract
The effect of temperature on the infrared spectroscopic parameters of hydrogen bonds between a number of phenol-nitrile systems has been studied. The. infrared frequency shift always decreases with increase in temperature. The variation of half width of the hydrogen bonded band, however, is not regular and is within the error of measurement. The intensity of the bonded band shows a general decrease with rise in temperature. All these variations are interpreted as being indicative of the weakening of the hydrogen bond with increase in temperature.
Potassium μ-(trans-Hyponitrito-N,N′-bis{pentacyanocobaltate(III)} and Potassium μ-(Trans-Hyponitrito-O,O′)-Bis{Pentacyanocobaltate(III)}
Authors: Okamura Hiromichi , Miki Eiichi , Mizumachi Kunihiko , Ishimori Tatsujiro 
Published: July 2006

Abstract
K6[Co2(CN)10(N2O2)]·2H2O (orange salt) was prepared by reaction of [Co(NO)(NH3)5]Cl2 with an aqueous solution of potassium cyanide. K6[Co2(CN)10(N2O2)]·4H2O (yellow salt) was obtained by adding an aqueous solution of the orange salt to methanol. On the basis of IR and Raman spectra for their 14NO- and 15NO-salts, and of IR spectra for their gaseous decomposition products, the orange salt is considered to be a linkage isomer of the yellow salt with respect to the trans-hyponitrito bridge. It is presumed that the orange salt is potassium μ-(trans-hyponitrito-N,N′-bis{pentacyanocobaltate(III)}, the yellow salt being potassium μ-(trans-hyponitrito-O,O′)-bis{pentacyanocobaltate(III)}.