bluuebunny/crossref_metadata_2025_split huggingface dataset:
Light Scattering by Oligostyrene Solutions
Authors: Kamata Toshio , Nakahara Hisae , Hattori Shigeru 
Published: July 2006

Abstract
Light-scattering photometers were partially modified in order to measure light scattering by low molecular-weight molecules. Corrections to the molecular weights were then theoretically estimated, when the light scattering due to fluid density fluctuations were approximated by that due to the density fluctuations of a pure solvent. The molecular weight of benzene was determined, in an ethyl methyl ketone solvent, using the light-scattering method prior to the determination of the molecular weights of oligostyrene molecules. Measurements of light scattering by oligostyrene molecules with molecular weights from 600 to 20000 were then carried out. The weight-average molecular weight observed by the light-scattering method was compared with the number-average molecular weights which were determined by the vapor-phase osmometric and NMR methods. The molecular-weight heterogeneity of the specimen is discussed. The second virial coefficient, in the ethyl methyl ketone solvent system, was found to change from negative to positive with increasing molecular weight. It is also shown that the molecular optical anisotropy changes markedly in the range of molecular weights between 2000 and 3000, the change being considered to reflect the conformational changes of oligostyrene molecules.
Hydrogen Bonding between Phenols and Nitriles
Authors: Jawed Inam 
Published: July 2006

Abstract
Hydrogen bonding between a number of para-substituted phenols and nitriles was studied by means of infrared spectroscopy using a longer cell. Thermodynamic quantities were determined and found to be the functions of the electronegativity and inductive effect of the phenol and nitrile substituents respectively except for the complexes of t-butyl cyanide for which the −ΔH values were lower than expected. Some correlations among thermodynamic quantities were also established. Both the sample and the reference cells were heated simultaneously by means of a special heating arrangement which minimized the base line errors and made the intensity measurements more accurate.
The Stereochemistry and Reactivity of Metal-Schiff Base Complexes. II. High Stereoselectivity in (1S,2S)-N,N′-1,2-Cyclohexylenebis-(salicylideneaminato)(sal2-(S,S)-chxn) Cobalt(III) Complexes with Amino Acids and the Optical Resolution of Amino Acids with Cobalt(III)-sal2-(S,S)-chxn
Authors: Fujii Yuki , Sano Mitsuo , Nakano Yoshiharu 
Published: July 2006

Abstract
A series of mixed ligand cobalt(III)–Schiff base complexes with the general formula of [Co(sal2-(S,S)-chxn)(aa)] (aa=gly−, l- and d-ala−, l- and d-val−, l- and d-leu−, l- and d-thr−, or l- and d-trp−) were newly prepared from [Co(sal2-(S,S)-chxn)] and amino acids by air oxidation. All the complexes were found to take, stereoselectively, the Λ-cis-β1(fac)-structure, irrespective of the configuration of the amino acids. On the other hand, the reactions of [Co(sal2-(S,S)-chxn)] with an excess of Dl-amino acids in open air gave [Co-sal2-(S,S)-chxn) (aa)], in which l-amino acids were selectively coordinated except for proline. These stereospecificities were found from the opticalpurity measurement of the unreacted amino acids which had been separated from the reaction solutions by extracting the formed complex with chloroform. The configuration and the optical purities of the unreacted amino acids recovered from 1 : 2 reaction solutions (complex: Dl-amino acid) were as follows: ala, (d, 6–10%); leu, (d, 6–8%); met, (d, 6–8%); ser, (d, 10–12%); thr, (d, 27–30%); asp, (d, 16–18%); glu, (d, 6–8%); phe, (d, 29–31%); trp, (d, 41–43%); pro, (l, 48–50%). These stereoselectivities and stereospecificities were explained in terms of the thermodynamic origin and the stereochemical requirement of the complexes.
Oxidation of Cinnamyl Alcohol with Peracetic Acid in Acidic Solvents
Authors: Ogata Yoshiro , Tomizawa Kohtaro 
Published: July 2006

Abstract
Peracetic acid oxidation of cinnamyl alcohol(1) in tetrahydrofuran(THF) at room temperature has been found to give phenylacetic acid(2), benzaldehyde(4) and cinnamyl acetate(5) as major products. A probable first-formed intermediate, 2,3-epoxy-3-phenyl-1-propanol(7), was detected as its derivative (1-phenyl-1,2,3-propanetriol), and also a probable second intermediate, 1-hydroxy-3-phenyl-2-propanone (3), was detected. 3 was found to be converted to 2 by the Baeyer-Villiger reaction. On the other hand, the peracetic acid oxidation of 1 in methanol gave a methanolysis product of oxirane ring, 3-methoxy-3-phenyl-1,2-propanediol(6a), a small amount of a rearrangement product and benzaldehyde. The peracid oxidation of 1 in various solvents was also studied. A probable reaction mechanism is discussed.
Circular Dichroism Spectra of Cobalt(III) Complexes Containing One or Two Azido, Isothiocyanato, and Nitro Ligands. II. trans-Type Bis[(1R,2R)-1,2-cyclohexanediamine] Complexes
Authors: Yamasaki Kiyoshi , Hidaka Jinsai , Shimura Yoichi 
Published: July 2006

Abstract
The trans dianiono type complexes of cobalt(III) containing (1R,2R)-1,2-cyclohexanediamine, trans-[Co(X)2(R,R-chxn)2]+, and -[Co(X)(X′)(R,R-chxn)2]+ (X and X′=N3−, NCS−, or NO2−) were prepared and their circular dichroism (CD) spectra measured in the visible and ultraviolet regions. The CD and absorption behaviors in the so-called specific absorption band region are compared with those of cis-type bis(ethylenediamine) complexes and discussed in relation to the origin of the specific band. In addition, three isomers of the [Co(NCS)(NH3) (R,R-chxn)2]2+ complex are assigned on the basis of their CD spectra.
Metal Complexes of Amino Acids. X. The Preparation and Characterization of Cobalt(III) Complexes of the Type [Co(N)2(O)4] Containing β-Alanine
Authors: Ama Tomoharu , Higa Matsutake , Koine Norio , Yasui Takaji 
Published: July 2006

Abstract
Three geometrical isomers of the bis(β-alaninato)(oxalato)cobaltate(III) and of the (β-alaninato)(glycinato)(oxalato)cobaltate(III) complexes have been prepared and resolved into their optical isomers. Their structures were assigned on the basis of the electronic absorption, 1H NMR and 13C NMR spectra. The circular dichroism spectra of these complexes have been measured and compared with those of the bis(glycinato)(oxalato)cobaltate(III) complexes.
RhCl(PPh3)3-catalyzed Coupling of Diorganomercurials
Authors: Takagi Kentaro , Hayama Naomi , Okamoto Tadashi , Sakakibara Yasumasa , Oka Shinzaburo 
Published: July 2006

Abstract
RhCl(PPh3)3 has been proved to be an effective catalyst for the reaction of various diorganomercurials to give such coupling products as conjugated diyne, conjugated diene, biaryl, and alkane in good yields under mild conditions. A probable mechanism including the oxidative addition of organomercurials to a rhodium complex and the subsequent reaction of two oxidative-addition adducts to yield the product was presented.
Imidazopteridines. I. Synthesis of Imidazo[1,2-c]pteridine and Its Alkyl Derivatives
Authors: Sugimoto Takashi , Shibata Keiko , Matsuura Sadao 
Published: July 2006

Abstract
The synthesis of imidazo[1,2-c]pteridine and its alkyl derivatives is described. The reaction of 4-aminopteridine with chloroacetaldehyde gave the ring-opened 2-formamido-3-(2-imidazolyl)pyrazine and the isomeric 2-amino-3-(1-formyl-2-imidazolyl)pyrazine but no imidazopteridine. 4-Amino-2-methylpteridine and chloroacetaldehyde similarly gave 2-acetamino-3-(2-imidazolyl)pyrazine in high yield. Hydrolysis of these compounds gave 2-amino-3-(2-imidazolyl)pyrazine, which was used as the key intermediate for the synthesis of the title compounds. Thus it reacted with triethyl orthoformate and homologues to give respectively the parent imidazo-[1,2-c]pteridine and its 6-methyl and 6-ethyl homologues. Their 2,3-dimethyl derivatives were prepared likewise from 2-amino-3-(2-imidazolyl)-5,6-dimethylpyrazine, which in turn was prepared from 4-amino-6,7-dimethyl- or 4-amino-2,6,7-trimethylpteridine.
Synthesis of Tetrahydrospectinomycin
Authors: Suami Tetsuo , Nishiyama Shigeru , Ishikawa Hikaru , Okada Hiroshi , Kinoshita Takeshi 
Published: July 2006

Abstract
Condensation of 1,3-bis-N-(benzyloxycarbonyl)actmamine (2) with 2-O-chloroacetyl-4,6-dideoxy-3-O-p-nitrobenzoyl-α-d-xylohexopyranosyl chloride (8), followed by deacylation and catalytic hydrogenation afforded 5-O-(4,6-dideoxy-β-d-xylohexopyranosyl)actinamine (11). Compound 11 was found to be identical with one of the four tetrahydrospectinomycins. 1H and 13C NMR spectra were determined and analyzed.
Dehydroannulenes. VII. Synthesis of 3,7,10,14-Tetrasubstituted 1,8-Bisdehydro[14]annulenes
Authors: Fukui Kunisuke , Nomoto Tateo , Nakatsuji Shin’ichi , Akiyama Shuzo , Nakagawa Masazumi 
Published: July 2006

Abstract
It was found that dienyne ketones such as 2,2-dimethyl-7-t-butyl-4,6-nonadien-8-yn-3-one, 2,2-dimethyl-7-phenyl-4,6-nonadien-8-yn-3-one and 1,5-diphenyl-2,4-heptadien-6-yn-l-one give the corresponding tetrasubstituted 14-membered cyclic glycols on treatment with a suspension of potassium hydroxide in liquid ammonia. Reactions of the cyclic glycols with tin(II) chloride in organic solvent saturated with hydrogen chloride afforded strongly diatropic tetrasubstituted bisdehydro[14]annulenes.
The Addition Reaction of Acyl Radicals to 9,10-Phenanthrenequinone in the Presence of the Corresponding Aldehydes. A Support for the In-Cage Mechanism of the Photochemical Reaction of 9,10-Phenanthrenequinone with Aldehydes
Authors: Maruyama Kazuhiro , Sakurai Hiroshi , Otsuki Tetsuo 
Published: July 2006

Abstract
Regarding the photochemical reaction of 9,10-phenanthrenequinone, 1, with acetaldehyde, 2, two reaction mechanisms have been proposed: the in-cage mechanism (Eq. 1) and the radical chain mechanism involving an acyl radical as the chain carrier (Eq. 2). For the establishment of the true reaction mechanism, the thermal addition reaction of an acyl radical to 9,10-phenanthrenequinone was investigated. The products in the thermal reaction were the dimeric isomers of the aryloxyl radical, 6, i.e., 4 and 5, which were quite different from the product of the photochemical reaction of 9,10-phenanthrenequinone with acetaldehyde, i.e., 9-acetoxy-10-hydroxyphenan-threne, 3. These results, as well as the estimation of the quantum efficiency for the photochemical reaction, exclude the radical chain mechanism (Eq. 2) and strongly support the in-cage mechanism (Eq. 1) for the photochemical reaction of 9,10-phenanthrenequinone with aldehyde.
Measuremets of the Thermal Transpiration Effects of NO at 90 K and of CO, N2, O2, CH4, and He at 77 K
Authors: Furuyama Shozo 
Published: July 2006

Abstract
The thermal transpiration effect of the title gases was measured by a relative method by using a diaphragm-type pressure transducer. The data fit the Takaishi-Sensui equation [P1⁄P2=(AX2+BX+C\sqrtX+\sqrtT1⁄T2)⁄AX2+BX+C\sqrtX+1)] quite well in the region of X(=P2d2) higher than 0.03 mmHg mm. The values for A, B, and C are 25.5, 9.3, and 0.6 for NO at 90 K, 28.5, 10.5, and 0.6 for CO and N2, 24.0, 9.2, and 0.8 for O2, 44.0, 11.4, and 1.2 for CH4, and 2.96, 0.6, and 1.6 for He at 77 k respectively. The values for the temperature-independent constants, A*, B*, and C* deduced from the values for A, B, and C above, were in agreement with the literature values and/or the estimated values.
On the Low Dimensionality in Organo-magnetic Material: 9-(α-Fluorenylidene-p-chlorobenzyl)-9-fluorenyl
Authors: Yamauchi Jun , Deguchi Yasuo 
Published: July 2006

Abstract
The low-dimensional character in the organic free radical, p-Cl-BDPA, is discussed. The temperature dependence of the g-values can provide a method of discrimination between the short- and long-range-ordering effects, and the organic free radical can be regarded as a one-dimensional organo-magnetic material at first approximation, but its interchain interaction is appreciable, amounting to the order of |J′|J|=0.2; thus, |J′|⁄k=0.88 K.
Formation and Characterization of Lead Monoxide Prepared by the Alkoxy-Method
Authors: Yamaguchi Osamu , Yamadera Minoru , Shimizu Kiyoshi 
Published: July 2006

Abstract
Lead alkoxide was hydrolyzed at various temperatures from 28 to 85 °C. The products consisted of only massicot or litharge, or a mixture of the two for modifications of PbO, depending on the reaction temperature and pH of the suspension.
Synthesis and Properties of 2,8-Dioxabicyclo[3.2.1]octane Derivatives
Authors: Irikawa Hajime , Ishikura Tsukasa , Okumura Yasuaki 
Published: July 2006

Abstract
In order to study the isomerization of daphniphylline into isodaphniphylline, 1,4-dimethyl-2,8-dioxabicyclo[3.2.1]octane-4-carboxylic acid (3), a degrada tion product of daphniphylline, was synthesized from the keto diester and transformed into the 3-oxacyclopentanones (6, 7).
Graft Polymerization on Pulverized Solid Surface. I. Grafting Polystyrene on a Clay Surface Treated with Silane Coupling Agents
Authors: Nakatsuka Takuo , Kawasaki Hitoshi , Itadani Katsuhiko 
Published: July 2006

Abstract
Styrene was graft-polymerized on kaolin clay treated with silane coupling agents e.g. (γ-methacryloyloxypropyl)trimethoxysilane. Although the silane-styrene copolymer was soluble in benzene, the polystyrene-grafted clay swelled in the same medium. A clay-crosslinked, threedimensional structure is suggested and conditions for gelation are also discussed.
On the Behavior of Paramagnetic Species Formed in the Pure V2O5 Crystal under SO2-Oxidation
Authors: Kera Yoshiya , Kuwata Keiji 
Published: July 2006

Abstract
Two types of ESR spectra were found in the highly purified V2O5 crystal under conditions of SO2 oxidation. The shapes and the intensities of the spectra were investigated in detail in the temperature range from 470 to 656 °C under various mixing ratios of SO2 to O2. Below ca. 600 °C a sharp and asymmetric spectrum existed stably, while above that temperature it was replaced by a spectrum with an hfs of 29 lines, the intensities of which always were very weak. The low-temperature-type spectrum was reasonably assigned to the VOSO4 phase, and the high-temperature-type, to an oxygen defect surrounded equivalently by four vanadium ions in the V2O5 phase. The interchange between the two spectra near 600 °C occurred reversibly and was related favorably to the following process in the surface layer of the V2O5 crystal: 2VOSO4=V2O5+SO3+SO2. The change in the working states of a pure V2O5 crystal according to the conditions of SO2 oxidation was discussed.
The Adsorption Mechanism of Methanol on Alkali Halides
Authors: Chikazawa Masatoshi , Kanazawa Takafumi 
Published: July 2006

Abstract
The amounts of methanol adsorbed on (100) planes of the crystals of six alkali halides (LiCl, NaCl, NaBr, KCl, KBr, and KI) and the isosteric heats of their adsorption were measured. For the chloride samples, the order of magnitude of the adsorption heats at a coverage of θ=0.5 was found to be LiCl&gt;NaCl&gt;KCl, while the order for the bromide samples was NaBr&gt;KBr. The monolayer capacities estimated from the adsorption isotherms for KCl and NaBr were in accord with the values calculated by assuming that one methanol molecule is adsorbed on one surface anion of the crystal. In the cases of the NaCl and LiCl salts, whose lattice spacings are smaller than that of NaBr, the methanol molecule was adsorbed on the surface anion with a ratio below 1 : 1. On the other hand, for the KBr and KI samples, whose lattice spacings are larger than that of KCl, alcohol was adsorbed on the surface anion in a ratio above 1 : 1. These phenomena are reasonably interpreted in terms of a relationship between the cross-sectional area of a methanol molecule and the lattice spacing of the salt concerned. An adsorptive mechanism deduced from the isosteric heat curves was compatible with the above explanation.
Semiconducting Properties of (LnI, LnII)CuO4 and of (Ln, A)2CuO4 (Ln=rare earth, A=alkaline earth)
Authors: Kenjo Tadao , Yajima Seishi 
Published: July 2006

Abstract
The ternary oxides, (La,Pr)2CuO4, (Gd,Tb)2CuO4, (La,Tb)2CuO4, (La,Ca)2CuO4 and (La,Ba)2CuO4, were prepared and their semiconducting properties were investigated. When the mean ionic radius of Ln3+ (\barr) is increased, the (La,Pr)2CuO4 compounds transform from semiconductors to metals at a critical \barr value of 1.05 Å. The metal-semiconductor transition which accompanies the shrinkage of the a axis, is explained as being due to the π-bond formation of the Cu–O bond. Compounds in the composition range from La1.3Tb0.7. CuO4 to La1.4Tb0.64CuO4 are peculiar to the (La,Tb)2CuO4 compounds. The crystal structure is the same as that of Ln2CuO4, but it is different from Ln2CuO4 as regards the c/a ratio and resistivity. The doping of 20 mol% CaO or 10 mol% BaO into La2CuO4 lowers the resistivity to tenth of that of La2CuO4.
Structural Studies of Asymmetric Hydrogenation. III. The Crystal Structure of (R)-1-(Methoxycarbonyl)ethyl(R)(+)-α-methylbenzylaminebis(dimethylglyoximato)cobalt(III)
Authors: Ohashi Yuji , Sasada Yoshio 
Published: July 2006

Abstract
The structure of (R)-1-(methoxycarbonyl)ethyl(R)(+)-α-methylbenzylaminebis(dimethylglyoximato)cobalt(III) has been determined by X-ray analysis. The crystal is monoclinic, the space group P21 Z=2 with a=7.899(5), b=16.397(2), c=9.054(7) Å, and β=90.98(7)°. The structure was deduced by the heavy atom method and refined by the block-diagonal least-squares method to a final R value of 0.048 for 2146 observed reflections. The bis(dimethylglyoximato) cobalt moiety is twisted around its long axis, owing to the steric repulsion from the (R)-1-(methoxycarbonyl)ethyl group and the optically active amine. It is proposed that this twist is one of the factors inducing the asymmetry in the hydrogenation catalyzed by the complex of bis(dimethylglyoximato)cobalt and the active amine. At the step of Co–C bond cleavage the reaction proceeds mainly through inversion of the configuration.
The Vibrational Spectra and Rotational Isomerism of Methylvinylsilane and Allylsilane
Authors: Ohno Keiichi , Taga Keijiro , Murata Hiromu 
Published: July 2006

Abstract
The infrared and Raman spectra have been measured for methylvinylsilane, CH2=CHSiH2(–D2)CH3, and allylsilane, CH2=CHCH2SiH3(–D3). The fundamental vibrations have been assigned, and the normal coordinate treatment for possible molecular forms has been carried out. For methylvinylsilane, the cis and skew forms coexist in the gaseous and liquid states, while only the former persists in the solid state. In the liquid state the cis form is more stable by 0.66±0.05 kcal/mol than the skew form. For allylsilane, the form near the skew form predominantly exists in the gaseous, liquid, and solid states.
The Crystal and Molecular Structures of trans-Bis(trimethylphosphine)-[1,2-bis(methoxycarbonyl)vinyl](phenylethynyl)palladium(II)
Authors: Yasuda Takao , Kai Yasushi , Yasuoka Noritake , Kasai Nobutami 
Published: July 2006

Abstract
The X-ray molecular structure of the addition product of trans-HPd(PEt3)2(C≡CPh) with dimethyl acetylene-dicarboxylate has been determined to be [trans-{(MeO2C)HC=C(CO2Me)}Pd(PEt3)2(C≡CPh)]. The crystal belongs to the monoclinic system, space group P21/c, with eight formula units in a cell with dimensions of a=17.844(3), b=9.476(3), c=36.061(4) Å, β=98.18(1)°. Two independent molecules have similar structures except for the conformation of the phenylethynyl groups and one of the triethylphosphine groups. The 1,2-bis(methoxycarbonyl)vinyl and phenylethynyl groups are σ-bonded to the palladium atom. No significant difference is observed between the Pd–C(sp)[2.04(2) and 2.03(2) Å] and Pd–C(sp2)[2.05(2) and 2.06(2) Å] bond lengths. The environment of the palladium atom is approximately square-planar: Pd–P=2.321(5), 2.312(5), and 2.305(5), 2.311(5) Å.
Solution Properties of Phycocyanin. IV. Studies of the Self-association Equilibrium of Phycocyanin in a pH 6.8 Solution
Authors: Iso Naomichi , Mizuno Haruo , Saito Takahide , Nitta Noriko , Yoshizaki Katsuaki 
Published: July 2006

Abstract
The self-association of phycocyanin in a buffer of pH 6.8 with an ionic strength of 0.1 has been studied by sedimentation equilibrium measurements in the temperature range from 5.2 to 25 °C. The self-association of this system increases with a decrease in the temperature. A quantitative evaluation of the experimental data for this system indicates that the type of the association reaction is not a simple mechanism such as a monomer\ightleftharpoonsn-mer, but the discrete monomer\ightleftharpoonstrimer\ightleftharpoonstetramer mechanism is probable. Several thermodynamic quantities, such as the Gibbs free energy change, ΔG°, the enthalpy change, ΔH°, and the entropy change, ΔS°, accompanying the self-association reaction were computed on the basis of the equilibrium constants. From the results, it is considered that the association process is similar to the ordinary crystallization, and that the formation of a tetramer proceeds at a higher concentration than that in which the trimerization reaction is completed.
The Mutual Separation of 227Ac, 227Th, 223Ra, and 223Fr by the Solvent Extraction Technique Using Bis(2-ethylhexyl)phosphoric Acid as an Extractant
Authors: Mitsugashira Toshiaki , Yamana Hajimu , Suzuki Shin 
Published: July 2006

Abstract
The separation and purification of 227Ac, 227Th, 223Ra, and 223Fr were studied by the solvent extraction method using HDEHP (bis(2-ethylhexyl)phosphoric acid) as an extractant. The mutual separation of Ac, Th, and Ra was achieved, and new milking processes for 223Fr and 228Ac are presented.
Hydrolytic Behavior of Oxovanadium(IV) Ions
Authors: Komura Akitoshi , Hayashi Mutsuo , Imanaga Hiroto 
Published: July 2006

Abstract
The hydrolysis of VO2+ was investigated in 0.1 M LiClO4 by potentiometric, conductometric and turbidimetric measurements. The following values of the equilibrium constants were obtained: β11=[VOOH+] [H+]⁄[VO2+]=9.0×10−6 M (M=mol dm−3); β22=[(VO)2(OH)22+][H+]2⁄[VO2+]2=1.9×10−7 M. The solubility product of VO(OH)2 given by Kspl=[VO2+][OH−]2 was found to be 6.6×10−23 M3 from the pH values at which precipitation occurs. Only one species with a stoichiometric ratio VO/OH=2.5 is present in basic solutions in the pH range 9–12. The solubility product of VO(OH)2 given by Ksp2=[H+][(VO)2(OH)5−] is logKsp2=−11.1. A less soluble salt Na(VO)2(OH)5 or NaHV2O5 was isolated from strongly basic solutions. Measurements of Na+ concentration at which the solid phase first appears give logKsp3=−3.74 as its solubility product, Ksp3=[Na+][(VO)2(OH)5−].
Formation and Properties of Strontium Uranates
Authors: Tagawa Hiroaki , Fujino Takeo , Tateno Jun 
Published: July 2006

Abstract
The formation and nonstoichiometry of strontium uranates, especially those with the Sr/U atom ratio around unity, were examined by means of thermogravimetry and X-ray diffraction. The reaction of SrCO3 with U3O8 in air, where Sr/U=1, produced the stoichiometric β-SrUO4, which had an orthorhombic structure. The reactions in vacuum and in hydrogen yielded the products of the composition SrUO3.563 and SrUO3.175, respectively. On the other hand, the reduction of β-SrUO4 in vacuum and in hydrogen gave SrUO3.48 and SrUO3.65, respectively. Stoichiometric SrUO3 was prepared by the reaction of SrO with UO2. The reduction product of β-SrUO4, SrUC4−x, was oxidized in air below 500 °C to α-SrUO4 which was rhombohedral. During the phase transition to β-SrUO4, α-SrUO4 exhibited anomalous behavior; that is, α-SrUO4 was first reduced and then reoxidized to nearly the initial composition with the formation of β-SrUO4. Of the uranates with Sr/U\eweq1, the formations of SrU4O13, SrU2O7, and Sr2UO5 were examined; the single phase SrU2O7 was not obtained. Thermograms for their reduction, followed by the oxidation of the resultants, suggest the existence of the compounds SrU4O11 and SrU2O6.0−6.6. No uranates containing only U(IV) were obtained by hydrogen reduction of the uranates containing U(VI) formed in air at high temperatures.