bluuebunny/crossref_metadata_2025_split huggingface dataset:
Ultraviolet Photoelectron Spectra of α- and β-Polymorphs of Copper Phthalocyanine
Authors: Chen Shang Xian , Seki Kazuhiko , Inokuchi Hiroo , Shi Zurong , Qian Renyuan 
Published: July 2006

Abstract
The ultraviolet photoelectron spectra have been measured for α- and β-forms of copper phthalocyanine at 183 °C, to investigate the correlation of photoemissive behavior with crystal structure. Their threshold ionization potentials were 4.88 and 4.62 eV, with polarization energy of 1.27 and 1.53 eV, respectively. This difference could not be explained by calculation with point charge-point dipole approximation, but calculation with distributed charge on the cation and distributed induced dipoles on the nearest neighbor two molecules gave semi-quantitative agreement with the experimental findings.
Phosphorescence Spectra of p-Dichlorobenzene in Various Matrices at 1.4 K
Authors: Kinoshita Minoru , Goto Narito , Iwasaki Noriko 
Published: July 2006

Abstract
The phosphorescence spectra of p-dichlorobenzene have been obtained at 1.4 K in various hosts; benzene, p-xylene, p-dichlorobenzene, p-dichlorobenzene-d4, and p-dibromobenzene. The long progressions in the b2g, C–Cl bending vibration are indicative of a molecular distortion in the out-of-plane direction. With the aid of the technique of optical detection of zero-field magnetic resonance, the intense 1580 cm−1 band previously ascribed to the ag, ν8a vibration is found to be due to the b3g, ν8h vibration. The appearance of the b3g band with strong intensity suggests a possibility of an additional in-plane distortion of phosphorescent p-dichlorobenzene.
The Synthesis, Properties, and Structure of Bis(N,N-dimethylacetamide)tris(O,O′-diisopropyl dithiophosphato)lanthanum(III)
Authors: Nagai Kiyofumi , Sato Yoshiyuki , Kondo Satoshi , Ouchi Akira 
Published: July 2006

Abstract
The new complex indicated in the title has been synthesized, and its crystal and molecular structure has been determined by the X-ray diffraction method. The crystal was triclinic; space group P\bar1, Z=2, a=23.071(9), b=11.060(11), c=10.793(13) Å, α=120.0(1), β=97.2(2), γ=88.9(2)°. The final R value for 5969 reflections is 0.047. The central lanthanum(III) atom is an octa-coordination and in a dodecahedron geometry, being coordinated with six sulfur atoms of three O,O′-diisopropyl dithiophosphate ligands (iPr2dtp), which span at three m edges, and with two oxygen atoms of both the N,N-dimethylacetamide ligands (dma) at both ends of the remaining m edge. The other [Ln(iPr2dtp)3L2]-type complexes, where Ln=La or Nd; L=dma or N,N-dimethylformamide, have also been obtained. The P=S double bond of the iPr2dtp ligand in the title complex is almost completely delocalized.
Determination of Ethylenediaminetetraacetic Acid and Nitrilotriacetic Acid as Their Iron(III)-Complexes by Reversed Phase High Performance Liquid Chromatography
Authors: Yamaguchi Akihiro , Rajput Allah Rakha , Ohzeki Kunio , Kambara Tomihito 
Published: July 2006

Abstract
The iron(III) complexes with ethylenediaminetetraacetic acid (EDTA, H4edta) and nitrilotriacetic acid (NTA, H3nta) were separated by the ion-association reversed phase high performance liquid chromatography. The retention behavior of iron(III)–nta complex on the column (4.6 mm i.d., 25 cm long) packed with ZORBAX-ODS was seriously affected by the pH of eluent composed of phosphate buffer solution containing tetrabutylammonium bromide and acetonitrile. A mixture of edta and nta in a synthetic sample solution containing the commonly present metal ions was converted to the corresponding iron(III) complexes and determined successfully by the present method.
The Coagulated Ion-exchanger Colorimetry of Cobalt(II)–Thiocyanate Complex
Authors: Suzuki Kin-ya , Ohzeki Kunio , Kambara Tomihito 
Published: July 2006

Abstract
The coagulated ion-exchanger colorimetry was applied to the determination of a trace amount of cobalt(II). Cobalt(II)–thiocyanate complex was fixed by a batch method on the coagulated material composed of fine particles of anion and cation exchangers. The coagulated material was collected on a filter paper and a colored thin layer was prepared. The coloration of the compound was further intensified by dipping the thin layer in a concentrated thiocyanate solution, and the absorbance was determined by a densitometer. The calibration curve showed a good linearity in the range of 1–15 μg of cobalt(II). Iron(III) and copper(II) showed interfering coloration, but these ions were effectively masked by the addition of fluoride and egta, respectively. Zinc(II) gave seriously negative error.
Cooperativity in the Binding of Sodium Dodecyl Sulfate to Amylose
Authors: Yamamoto Masako , Sano Takayuki , Harada Shoji , Yasunaga Tatsuya 
Published: July 2006

Abstract
The binding isotherm of sodium dodecyl sulfate to amylose was potentiometrically investigated by using amyloses of various degrees of polymerization from 32 to 1100. From the Scatchard plots, the binding was found to be cooperative for the amyloses of DP≥76 and Langmuir type for those of DP≤57. By analogous experiments using a series of sodium alkyl sulfates, it was clarified that (1) eight carbon atoms of surfactant are required for the complexation and (2) more than twelve carbon atoms of surfactant are required for the cooperative binding. Thus, the amylose has an interrupted helical structure in solution and the cooperativity arises from the hydrophobic interaction between the surfactants included partly in the helic of amylose.
The Reaction of Sulfur Dioxide with Thiols Catalyzed by Boron Trifluoride Etherate. Evidence for a Possible Intervention of Dithiosulfite as a Reaction Intermediate
Authors: Akiyama Fuminori 
Published: July 2006

Abstract
The reaction of sulfur dioxide (SO2) with 1-propanethiol (NPT), 2-propanethiol (IPT), or 2-methyl-2-propanethiol (TBT) catalyzed by boron trifluoride ethrate (BF3OEt2) was investigated. The ratios of dialkyl trisulfide to dialkyl disulfide obtained (RSSSR/RSSR) at an early stage of the reaction were larger than 1 for the reaction of TBT and less than 1 for the reaction of NPT or IPT. The reaction of dithiosulfites with BF3OEt2 in the presence or absence of thiol was investigated. From a consideration of the similarity of the composition of the sulfides formed in the reaction of dithiosulfites with BF3OEt2 to those in the reaction of SO2 with thiol in the presence of BF3OEt2, the possibility of the intervention of dithiosulfite as a reaction intermediate in the reaction of SO2 with thiol was discussed.
Predominant Intramolecular Pummerer Reactions of Substituted Benzyl p-Tolyl Sulfoxides with Acetic Anhydride
Authors: Itoh Osamu , Numata Tatsuo , Yoshimura Toshiaki , Oae Shigeru 
Published: July 2006

Abstract
In the Pummerer reactions of 18O-labeled benzyl, and 3,5-dichlorobenzyl p-tolyl sulfoxides with a large excess of unlabeled acetic anhydride in the presence of DCC as acid scavenger, the resulted Pummerer reaction products, the α-acetoxy sulfides, were found to have retained substantial amounts of 18O-label of the original sulfoxides, i.e., nearly a half or more. Meanwhile, when optically active benzyl, 3-chlorobenzyl, and 3,5-dichlorobenzyl p-tolyl sulfoxides were allowed to react with excess acetic anhydride in the presence of DCC, the α-acetoxy sulfides, the Pummerer reaction products obtained, were found to have no optical activity. These observations suggest that the acetoxyl migration from sulfur atom to α-carbon is predominantly intramolecular, however, the α-(p-tolylthio) carbenium acetate ion-pair formed during the reaction prior to racemization is less intimate than those which are formed in the reactions of cyanomethyl and (α-carbonyl-substituted methyl) p-tolyl sulfoxides which give the corresponding highly optically active α-acetoxy sulfides.
The Baeyer-Villiger Oxidation of 8-Oxabicyclo[3.2.1]octan-3-ones. Substituent Effects on the Regioselectivity
Authors: Noyori Ryoji , Sato Tsuneo , Kobayashi Hiroshi 
Published: July 2006

Abstract
8-Oxabicyclo[3.2.1]octan-3-one derivatives serve as excellent models that elucidate factors controlling the reactivities and selectivities in the Baeyer-Villiger oxidation. The regioselectivity of the oxidation with trifluoroperacetic acid is markedly affected by the electronic properties of substituents at position α or β to the carbonyl function. Remote effects of the γ-substituents are also of significance. This study has disclosed yet unrecognized through-bond electronic influence and regioselection based on chiral orientation of hydroxyl group in the transient tetrahedral intermediate.
Stereocontrolled General Synthesis of Pyrimidine C-Nucleosides Having Branched-chain Sugar Moieties
Authors: Sato Tsuneo , Watanabe Makoto , Kobayashi Hiroshi , Noyori Ryoji 
Published: July 2006

Abstract
A variety of pyrimidine C-nucleosides bearing branched-chain sugars can be synthesized starting from adequately substituted (1R*,6S*,7S*,8R*)-7,8-isopropylidenedioxy-3,9-dioxabicyclo[4.2.1]nonan-4-ones. The general procedure consists of condensation with t-butoxybis(dimethylamino) methane, giving the corresponding α-dimethylaminomethylene lactones, base-catalyzed heterocycle formation with urea, thiourea, or guanidine, and acid-promoted removal of the isopropylidene protective group. The overall transformation proceeds with retention of the stereochemistry to afford only C-β-glycosyl nucleoside structures.
General Synthesis of Homo-C-nucleosides
Authors: Sato Tsuneo , Noyori Ryoji 
Published: July 2006

Abstract
Lithium aluminium hydride reduction of methyl (2,3-O-isopropylidene-5-O-trityl-β-d-ribofuranosyl) acetate gives 2-(2,3-O-isopropylidene-5-O-trityl-β-d-ribofuranosyl)ethanol. Subsequent tosylation, displacement by cyanide ion, nitrile hydrolysis, and diazomethane methylation afford methyl 3-(2,3-O-isopropylidene-5-O-trityl-β-d-ribofuranosyl)propionate. The base-promoted formylation followed by methylation with methyl iodide forms methyl 2-[(2,3-O-isopropylidene-5-O-trityl-β-d-ribofuranosyl)methyl]-3-methoxyacrylate. Base-catalyzed condensation of the methoxyacrylate and urea followed by deprotection produces 5-[(β-d-ribofuranosyl)methyl]uracil. In a like manner, condensation of the methoxyacrylate with thiourea or guanidine gives, after deblocking, 5-[(β-d-ribofuranosyl)methyl]-2-thiouracil and 5-[(β-d-ribofuranosyl)methyl]isocytosine, respectively. Ozonolysis of the methoxyacrylate yields methyl 3-(2,3-O-isopropylidene-5-O-trityl-β-d-ribofuranosyl)pyruvate, which undergoes condensation with carbamoylmethylenetriphenylphosphorane to furnish a mixture of methyl 2-[(2,3-O-isopropylidene-5-O-trityl-β-d-ribofuranosyl)methyl]fumaramate and 2-[(2,3-O-isopropylidene-5-O-trityl-β-d-ribofuranosyl)methyl]maleimide. Deprotection of the latter leads to 2-[(β-d-ribofuranosyl)methyl]maleimide. Condensation of the keto ester with ethyl hydrazinoacetate followed by cyclization affords 3-[(2,3,O-isopropylidene-5-O-trityl-β-d-ribofuranosyl)methyl]-5-methoxycarbonyl-4-hydroxypyrazole. Ammonolysis of the methyl ester and deprotection furnishes 3-[(β-d-ribofuranosyl) methyl]-5-carbamoyl-4-hydroxypyrazole.
Electron Microscope Studies on Radiography. III. Formation of Lumpish Developed Silver in Radiography
Authors: Hara Hiroshi 
Published: July 2006

Abstract
The shape of developed silver in industrial X-ray films exposed to a high energy radiation has been found mainly lumpish, which differs from the filamentary shape observed in ordinarily-developed photographic films. The formation process and crystalline states of lumpish silver were studied with an electron microscope in comparison with those of filamentary silver. Lumpish silver cannot be in a single uniform crystalline state under a kind of hindrance due to too active a development for regular crystal growth, the thickness of emulsion layer and the concentration of silver halide also have some effects.
Static and Kinetic Studies of the Interaction of Tryptophan with Fluorescein Mercury(II) Acetate by Fluorescence and Absorption Spectrophotometry and by Fluorescence Stopped-fiow Method
Authors: Ohnishi Masatake , Taniguchi Michio , Hiromi Keitaro 
Published: July 2006

Abstract
Fluorescein mercury(II) acetate (FMA) was found to combine with tryptophan (Trp) to form the FMA–Trp complex. The interaction was interpreted in terms of a reversible single-step binding mechanism. The dissociation constant of the complex estimated kinetically by means of the stopped-flow method using the forward and backward rate constants was in good agreement with that obtained by the static method. From comparison with several derivatives of tryptophan, it was found that the protonated amino group and the indole moiety of tryptophan are essential for the complex formation.
Spectrophotometric Determination of Iron(II) after Extraction of Its 4′-(p-Methoxyphenyl)-2,2′: 6′,2″-terpyridine Complex with Tetraphenylborate Anion into Molten Naphthalene
Authors: Lin Jenn-Lin , Chang Lih-Fen , Satake Masatada 
Published: July 2006

Abstract
A new method is described for the extraction of ion-associated complex of iron(II) 4′-(p-methoxyphenyl)-2,2′ : 6′,2″-terpyridine (abbreviated as MPTP) cation with tetraphenylborate (TPB) anion into molten naphthalene. The solid mixture containing the colored complex is dissolved in N,N-dimethylformamide (DMF) and the absorbance was measured at 576 nm. The other factors such as pH, amounts of reagents and naphthalene, shaking time and diverse ions are studied. The method has been applied for the determination of iron in reference materials and practical samples and the results was compared with the conventional 2,4,6-tri(2-pyridyl)-1,3,5-triazine (TPTZ) procedure.
Structural Study of Optical Resolution. XII. The Crystal and Molecular Structure of (−)589-trans-SS-Bis(isothiocyanato)(triethylenetetramine)cobalt(III) μ-(+)-Tartrato(4−)-μ-(+)-hydrogentartrato(3−)diantimonate(III) Tetrahydrate
Authors: Kushi Yoshihiko , Kuramoto Masahiro , Utsuno Shunji , Yoneda Hayami 
Published: July 2006

Abstract
The crystal and molecular structure of the diastereoisomeric salt, (−)589-trans-[Co(NCS)2(trien)][Sb2((+)-tart)((+)-tartH)]·4H2O, has been determined by the X-ray diffraction method. The red crystals were monoclinic, with the space group P21, a=8.987(1), b=15.949(2), c=10.726(1) Å, β=102.57(2)°, and Z=2. The structure was solved by the heavy-atom method and refined by the block-diagonal least-squares method, using 2976 independent reflections, to the final R-value of 0.033. In the complex cation, the conformations of the three five-membered chelate rings are (δλδ), while the absolute configurations of the two asymmetric nitrogen atoms are both S. The mononegative anion has a dimeric structure of [Sb2((+)-C4H2O6)((+)-C4H3O6)]−, in which (+)-C4H2O64− and (+)-C4H3O63− coordinate to two SbIII atoms. The extra hydrogen atom in (+)-C4H3O63− bonds to the free oxygen atom(OTB5) of the carboxylato group, and a short contact is formed between this oxygen atom and a water molecule(OW2); OTB5···OW2 2.43(1) Å. Though six N–H hydrogen atoms are present in the complex cation, three of them form N–H···O hydrogen bonds to the oxygen atoms of the dimeric anion; NTR3···OTA1 2.86(1), NTR4···OTA6 2.86(1), and NTR1···OTB4 3.19(1) Å.
Thiolate-bridged Metal Complexes. Nickel(II), Palladium(II), and Cobalt(III) Binuclear Complexes of 1,5-Diamino-3-pentanethiol
Authors: Murase Ichiro , Ueno Shigehiro , Kida Sigeo 
Published: July 2006

Abstract
A binucleating ligand with thiolate sulfur as a bridging atom, 1,5-diamino-3-pentanethiol (Hdpet) and its metal complexes, Ni2(dpet)2X2 (X=Br, ClO4, NO3, BPh4, and NCS) were synthesized. All the complexes are diamagnetic at room temperature. The Ni(II) and Pd(II) complexes assume binuclear thiolate-bridged square planar coordination. This structure is maintained even in aqueous solution. The electronic spectra of the Ni(II) complexes showed a band at 27.3×103 cm−1 corresponding to the 29.8×103 cm−1 band of [Ni2(dpl)2]2+ which is characteristic of oxo-bridged Cu(II) and Ni(II) complexes and was assigned to the pπ(O)→dσ(metal) transition. Several trials by different methods only resulted in the separation of a single species of Co(III) complex, Co2(dpet)3(ClO4)3. This was characterized as a bioctahedron facially joined at the three thiolate sulfur atoms.
Aromatic Nucleophilic Substitution. XVIII. Kinetics of Reactions of 2-(Acetylamino)ethyl 2,6-Dinitrophenyl Ether and N-Acetyl-N-(2-hydroxyethyl)-2,6-dinitroaniline with Sodium Isopropoxide
Authors: Sekiguchi Shizen , Hirai Motohiko , Tomoto Noboru 
Published: July 2006

Abstract
The kinetics of the reactions of 2-(acetylamino)ethyl 2,6-dinitrophenyl ether (Smiles rearrangement) and N-acetyl-N-(2-hydroxyethyl)-2,6-dinitroaniline with sodium isopropoxide in the DMSO–2-propanol mixture (20 : 80 v/v) was studied. Both reactions were found to rapidly produce the same spiro anionic σ complex, giving N-(2-acetoxyethyl)-2,6-dinitroaniline. Although the rates for formation of the complex were different in both reactions, the rates for rearrangement were the same.
Benzofuran Derivatives. I. On the Effects of Substituents in Benzofuran Syntheses
Authors: Suzuki Tsuneo , Horaguchi Takaaki , Shimizu Takahachi , Abe Teishiro 
Published: July 2006

Abstract
The Rössing’s reaction of 4-substituted 2-acylphenoxyacetic acids give a mixture of benzofurans and 2-benzofurancarboxylic acids. The relative yields of benzofurans and 2-benzofurancarboxylic acids depend on the substituents on the benzene ring of the 2-acylphenoxyacetic acids. Electron-withdrawing substituents such as nitro groups favor the formation of 2-benzofurancarboxylic acids. On the other hand, the formation of benzofurans is favored by the steric hindrance of 2-acyl groups in the reaction of 2-acyl-4-nitrophenoxyacetic acids with anhydrous sodium acetate and acetic anhydride.
Electro-organic Reactions on Organic Electrodes. Part 2. Electrochemical Asymmetric Reduction of Citraconic and Mesaconic Acids on Optically-active Poly(amino acid)-coated Electrodes
Authors: Nonaka Tsutomu , Abe Shigemitsu , Fuchigami Toshio 
Published: July 2006

Abstract
Influence of a number of electrolytic conditions on the asymmetric yield of methylsuccinic acid (2) formed in the electrochemical reduction of citraconic acid (1) on poly(amino acid)-coated electrodes was examined. The asymmetric yield was greatly affected by the conditions, while the absolute configuration of an excess enantiomer((S)-(−)-2) remained unchanged even when a polymer with the reversed configuration of the monomer unit was used. The configuration of the excess enantiomer was also unchanged in the asymetric reduction of mesaconic acid which is the geometrical isomer of 1.
Preparation, Characterization and Stereochemistry of 2-Methyl-2-silabicyclo[2.2.1]heptane Derivatives
Authors: Hosomi Akira , Mikami Masashi , Sakurai Hideki 
Published: July 2006

Abstract
A new class of bicyclic compounds containing a single silicon atom at the bridge, 2-exo- and endo-substituted 2-methyl-2-silabicyclo[2.2.1]heptanes, have been prepared from the corresponding 3-cyclopentenyl-methylhydrosilane by the intramolecular hydrosilylation catalyzed by chloroplatinic acid, and their structures were unquivocally assigned by 1H and 13C NMR spectra. Dramatic crossover from inversion to retention was found in the phenylation of chlorosilanes with phenyllithium and phenylmagnesium bromide in ether. Regio- and stereoselective insertion of dichlorocarbene generated from phenyl(bromodichloromethyl)mercury, or from chloroform and sodium hydroxide in the presence of a phase transfer catalyst, into C(6)–H(exo) bond of 2-silanorbornanes has been observed.
New Industrial Synthesis of Squalane
Authors: Nishida Takashi , Ninagawa Yoichi , Itoi Kazuo , Fujita Yoshiji 
Published: July 2006

Abstract
Squalane is synthesized by the ethynylation reaction of geranylacetone with a complex of 1,3-butadiyne : N-methylpyrrolidone (=1 : 1) in the presence of a KOH catalyst and by hydrogenation with a Raney nickel catalyst, followed by hydrogenation hydrogenolysis with a mixed catalyst of nickel/diatomaceous earth and silica-alumina. An alternative synthesis of squalane from dehydronerolidol is also achieved by oxidative coupling reaction with a copper(II) catalyst under a helium atmosphere.
Extraction–Spectrophotometric Determination of Molybdenum(V) with Imidoyl Derivatives and Thiocyanate
Authors: Patel Khageshwar Singh , Mishra Rajendra Kumar 
Published: July 2006

Abstract
Three new organic reagents derived from N-phenylbenzimidoyl chloride and thiourea, phenylthiourea or thiosemicarbazide react with Mo(V) in strongly acidic media in the presence of thiocyanate ions to give rise red-orange complexes, insoluble in water but soluble in benzene. The nature of the ligands has been described to be as univalent, bidentate chelating agents which may coordinate to Mo(V) to form complexes with the composition of Mo 0.2SCN·SR (SCN denotes thiocyanate ion and SR, deprotonated form of the reagents). The molar absorptivity of the complexes was found to be in the range of (0.8–1.4)×104 l mol−1 cm−1 at λmax, 465 nm. The method is simple, rapid and highly selective for Mo. The ferroalloy elements which are associated with the metal do not interfere with the determination. The method was applied to the analysis of ore and alloy steel samples for Mo.
Studies in Nickel(IV) Chemistry. Kinetics of Electron Transfer from Hydrazine to Tris(dimethylglyoximato)nickelate(IV) in Aqueous Medium
Authors: Acharya Sridhara , Neogi Gautam , Panda Rama Krushna , Ramaswamy Dorai 
Published: July 2006

Abstract
Kinetics of electron transfer from hydrazine(L) to tris(dimethylglyoximato)nickelate(IV), [Ni(dmg)3]2−, follow pseudo-first-order disappearance in the Ni(IV) in aqueous medium in the range 5.0≤pH≤7.0. The pseudo-first-order rate constants (kobsd) increase with increasing [L]0 and attain limiting values at higher relative [L]0. The kobsd-pH profiles at various [L]0 show that the kobsd values register steep decrease with increasing pH till pH≈6.5 tending to level off at higher relative pH. Results are consistent with probable interactions of the one-protonated and two-protonated Ni(IV) species with the protonated substrate, or with the metal ion-substrate complex that might have been formed from trace metal ion and the substrate. The two-protonated Ni(IV) complex apparently reacts several orders of magnitude faster than the one-protonated species.
A New Series of Heptamolybdonickelate(IV) and Manganate(IV). Investigation of the Unusual Magnetic and Electronic Spectral Behavior of the Nickel(IV) Compound
Authors: Roy Ajoy , Chaudhury Muktimoy 
Published: July 2006

Abstract
Two new heteropolymolybdates of nickel(IV) and manganese(IV) of composition K2H8NiMo7O28·6H2O and K2H8MnMo7O28·4H2O with a hitherto unknown 1 : 7 (Ni/Mn : Mo) stoichiometry are reported. X-Ray powder patterns show that they are isomorphous. The electronic spectrum of the nickel(IV) compound exhibits four absorption bands at 16.4, 17.5, 18.3, and 24×103 cm−1, and the room temperature magnetic moment of the compound is abnormally high, 1.78 μB. The rationale for these observations is that there are Ni3+ impurity which occupy interstitial positions in the crystal lattice and as a consequence of dynamic Jahn-Teller distortion the high-spin 4A2g(4T1g) state of the Ni3+ ion lies close to the low-spin ground state 2A1g(2Eg) to get thermally populated to an appreciable extent leading to significant triplet state contribution.
Heats of Solutions of Bolaform Electrolytes in Water
Authors: Tamaki Kunio , Irie Kaoru 
Published: July 2006

Abstract
The heats of solutions of polymethylene-diammonium dichlorides [H3N(CH2)nNH3]Cl2 (n=2–8, 10, and 12) and disodium polymethylene disulfates Na2[O3SO(CH2)nOSO3] (n=2–6, 8, and 10) in water were measured at 15, 25, and 35 °C. The changes in the heat capacity for dissolution, ΔCpo, were obtained from the relation between the heats of soultion and the temperature, and the results were compared with the ΔCpo values for alkylammonium chlorides and sodium alkyl sulfates previously reported.