bluuebunny/crossref_metadata_2025_split huggingface dataset:
Layered Compounds. XLII. Syntheses and Properties of Layered Paracycloheterophanes
Authors: Otsubo Tetsuo , Mizogami Shigeyoshi , Osaka Norihisa , Sakata Yoshiteru , Misumi Soichi 
Published: July 2006

Abstract
A series of multilayered paracyclofuranophanes and paracyclothiophenophanes were synthesized by crossbreeding Hofmann elimination method from mixed quaternary ammonium hydroxides. Their structures and conformations were elucidated by NMR analyses. In electronic spectra, paracyclothiophenophanes exhibited stronge transannular electronic interactions than paracyclofuranophanes whose absorption curves show unexpected resemblance to those of multilayered metaparacyclophanes. Paracyclofuranophanes and [2.2](2,5)furanophane underwent addition reaction with benzyne to give 1 : 1 and 1 : 2 adducts, respectively. Their structures and properties were also studied by spectral measurements.
Total Synthesis of Minosaminomycin
Authors: Iinuma Katsuharu , Kondo Shinichi , Maeda Kenji , Umezawa Hamao 
Published: July 2006

Abstract
A component of the antibiotic minosaminomycin (1), (−)-1d-1-amino-1-deoxy-myo-inositol (4) was synthesized from d-inositol (3) by catalytic oxidation of an axial hydroxyl group followed by reduction of the ketoxime. Minobiosamine, 1d-1-amino-1-deoxy-4-O-(α-d-kasugaminyl)-myo-inositol (2), was synthesized from 2′,4′-di-N-acetylkasuganobiosamine (9) by a similar method, and separated from the two isomers of 2. The total synthesis of 1 was accomplished by coupling 2′,4′-di-N-benzyloxycarbonylminobiosamine (14) and Nα-[(S)-1-benzyloxycarbonyl-3-methylbutylcarbamoyl]enduracididine (15) followed by removal of the protective groups. Compound 14 was derived from 1,2′,4′-tri-N-benzyloxycarbonylminobiosamine through the formation of the cis-1,2-carbamate. A diastereomer of 1 was also synthesized using alloenduracididine.
Preparation and Resolution of (4-Aminobutanoic acidato)bis(ethylenediamine)cobalt(III) Ion
Authors: Kojima Masaaki , Takayanagi Hiromichi , Fujita Junnosuke 
Published: July 2006

Abstract
A new complex containing a seven-membered chelate ring, [Co(amb)(en)2]2+ (amb=4-aminobutanoato ion) was prepared and resolved. The complex is decomposed in 1.0 M HClO4 at room temperature to give [Co(H2O)(Hamb)(en)2]3+ in which the Hamb acts as a unidentate ligand with a free carboxyl group.
Synthesis of Manninotriose Undecaacetate
Authors: Adachi Ryoichi , Suami Tetsuo 
Published: July 2006

Abstract
Manninotriose undecaacetate has been prepared from melibiose. Tritylation of melibiose, followed by acetylation gave 6′-O-trityl-β-melibiose heptaacetate. Detritylation of the compound gave hepta-O-acetyl-β-melibiose, which was condensed with tetra-O-benzyl-d-galactopyranosyl chloride. Deacetylation of the condensation product, followed by hydrogenolysis and acetylation afforded the title compound.
Syntheses with 2-Furylmagnesium Bromides. I. Synthesis of Rosefuran and Sesquirosefuran
Authors: Takeda Akira , Shinhama K\={o}ichi , Tsuboi Sadao 
Published: July 2006

Abstract
The preparation and reactions of 2-furylmagnesium bromide and 3-methyl-2-furylmagnesium bromide (4b) have been studied. Activated 90% magnesium–copper alloy was used to prepare the Grignard reagents. The reaction of 1-bromo-3-methyl-2-butene with 4b gave rosefuran in a 40% yield; that of geranyl bromide with 4b gave sesquirosefuran in a 26% yield.
Multielement Analysis of Deep-Sea Sediments by Photon Activation
Authors: Kato Toyoaki , Sato Nobuyoshi , Suzuki Nobuo 
Published: July 2006

Abstract
A nondestructive photon activation with 30 MeV bremsstrahlung has been applied to the multielement determination in the pelagic sediments in a region of the Pacific Ocean. The abundances for 6 major and 10 trace elements were measured in several deep-sea floors and the core samples, discussion being given on the results. Determination of trace elements such as Cr, Co, Ni, and Sr is valuable because of their geochemical significance.
Potentiomeric and Polarographic Studies on Complex Formation of Cadmium(II) Ion with Ethylenediaminemonoacetic Acid
Authors: Oyama Noboru , Horie Masashi , Matsuda Hiroaki , Ohtaki Hitoshi 
Published: July 2006

Abstract
The complex formation equilibria between Cd(II) ion and ethylenediaminemonoacetic acid (EDMA) were examined by potentiometry in a 1.0 mol dm−3 NaClO4 solution at (25.00±0.02) °C, and it was found that neither protonated nor hydrolyzed complex was formed in the range of pH from 2 to 10. The formation constants of Cd(II)–EDMA complexes as well as the protonation constants of EDMA anion determined were as follows: logβ101=6.86, logβ102=12.32; logβ011=9.97, logβ021=16.71, logβ031=18.76, where βpqr=[MpHqLr]/[M]p[H]q[L]r. The formation constants were also examined polarographically.
Semiintegral Electroanalysis in the Absence of Supporting Electrolyte
Authors: Goto Masashi , Grenness Morten , Oldham Keith B 
Published: July 2006

Abstract
The limiting semiintegral of the current which flows when a stationary electrode is progressively polarized in the presence of electroactive species has been investigated under the condition of no supporting electrolyte present in the solution. The semiintegral, m(t), of the current, i(t), is defined by
m(t)=\fracd^-1/2dt^-1/2i(t)=\frac1π^1/2∫_0^t\fraci(λ)(t-λ)^1/2dλ.
The electroreduction of a number of heavy metal ions has been studied at a mercury drop electrode and it was found that the limiting semiintegral is larger than that observed with excess supporting electrolyte present. The finding is in agreement with a simple theory which considers both diffusion and migration mass transfer processes. The factor by which the limiting semiintegral increases has been shown to depend on the diffusion coefficients and charge numbers of the cation and anion.
Structure and Characterization of Copper(II) and Nickel(II) Complexes with 3-Acetyl-5,6-dimethylpyridazine Hydrazone, the Condensation Product of Biacetyl and Hydrazine
Authors: Okawa Hisashi , Matsumoto Naohide , Kida Sigeo 
Published: July 2006

Abstract
Copper(II) and nickel(II) complexes, MLX2·nH2O (L=C16H24N8; X=Cl−, Br−, NO3−, ClO4−, BF4−; n=0, 2), were obtained by reacting diacetyl with hydrazine in the presence of a metal ion and characterized. The condensation product L was found to be 3-acetyl-5,6-dimethylpyridazine hydrazone. The molecular structure of NiL(ClO4)2·2H2O has been determined, the configuration around the nickel(II) ion being a distorted octahedron.
Photoreaction of 4-Substituted Quinoline N-Oxide and 2(1H)-Quinolinone in Propionic Acid
Authors: Ide Akio , Mori Yukinori , Matsumori Kunihiko , Watanabe Hiroyasu 
Published: July 2006

Abstract
4-Substituted cis-3-ethyl-2-oxo-1,2,3,4-tetrahydro-2-quinoline was formed as a major product, by irradiation of quinoline N-oxide and 2(1H)-quinolinone substituted with an electron-withdrawing group at the C-4 position in propionic acid. Also, the products were confirmed by direct comparison with synthesized compounds.
Chemical Studies on Tuberactinomycin. XI. Semisyntheses of Tuberactinomycin Analogs with Various Amino Acids in Branched Part
Authors: Wakamiya Tateaki , Teshima Tadashi , Sakakibara Hideo , Fukukawa Kiyoshi , Shiba Tetsuo 
Published: July 2006

Abstract
Thirty two semisynthetic tuberactinomycins were prepared by introduction of various amino acids to amino group of tuberactinamine N, a cyclic peptide moiety of tuberactinomycin N and O, which was isolated from natural tuberactinomycin N by acid treatment with liberation of γ-hydroxy-β-lysine of the branched part. Among introduced amino acids, β-amino acids were synthesized from corresponding α-amino acids by modified Arndt-Eistert reaction. After couplings of N-protected amino acids with tuberactinamine N, deprotections were carried out to give semisynthetic tuberactinomycins. From their minimum inhibitory concentrations against many bacteria, it was suggested that a branched part effects significantly to the strength of antimicrobial activities though most important active site must locate in the cyclic peptide moiety, and basicity and/or hydrophobicity of the branched part seemed to strengthen the antibacterial activity especially.
Studies of Peptide Antibiotics. XXXV. Synthesis of Gramicidin S by a Fragment Solid-Phase Method
Authors: Sato Kazuki , Abe Hayao , Kato Tetsuo , Izumiya Nobuo 
Published: July 2006

Abstract
In order to examine the usefulness of a fragment condensation procedure in solid-phase peptide synthesis, gramicidin S (GS) was synthesized by three different procedures such as stepwise elongation, fragment condensation with dipeptide fragments, and fragment condensation with tripeptide fragments. The two fragment condensation procedures gave intermediate peptide derivatives in high yields and in high purity. Such differences in the purity of the intermediate peptides disappeared in the final product, GS dihydrochloride. The GS synthesized by the three procedures exhibited the same antibacterial activities as those of natural GS.
Reaction of Coordinated Phosphines. III. Reaction of Phenyl Compounds of Typical Groups V and VI Elements with Palladium(II) Salts in the Presence of Olefinic Compounds
Authors: Kawamura Teruo , Kikukawa Kiyoshi , Takagi Makoto , Matsuda Tsutomu 
Published: July 2006

Abstract
The reaction of phenyl compounds of typical groups V and VI elements, PhnA and PhnAX2 (n=2, 3; A=P, As, Sb, Bi, S, Se, Te; X=Cl or X2=O), with Pd(II) salts was studied in the presence of olefinic compounds (1-octene and ethyl acrylate) in acetonitrile. The phenyl migration from A to Pd to produce phenylpalladium species, which lead to the phenylation of olefin, was observed for all PhnA and PhnAX2 (except for A=S and Ph3PX2) when Pd(OAc)2 was utilized. The reaction, however, was inhibited or greatly suppressed for the compounds of P and As when PdCl2 was used in place of Pd(OAc)2. The compounds of Sb and Bi readily react with PdCl2. Mechanistic discussion was given in terms of the extent of nucleophilic assistance by acetate ion when Pd(II) attacks the aromatic nucleus electrophilically at the carbon atom bonded to A.
Synthesis and Absolute Stereochemistry of (+)-6,15-Dihydro-6,15-ethanonaphtho[2,3-c]pentaphene as Determined by Exciton Chirality and X-Ray Bijvoet Methods
Authors: Harada Nobuyuki , Takuma Yuki , Uda Hisashi 
Published: July 2006

Abstract
(6R,15R-(+)-6,15-Dihydro-6,15-ethanonaphtho[2,3-c]pentaphene (1) was synthesized from (9R,10R)-(+)-dimethyl 9,10-dihydro-9,10-ethanoanthracene-1,5-dicarboxylate, the absolute configuration of which has been established by the X-ray Bijvoet method and chemical correlations. The CD spectrum of 1 clearly exhibits very strong positive first and negative second Cotton effects due to coupling of the 1Bb transitions (Δε268.0=+931.3 and Δε249.7=−720.8; A(=Δε1–Δε2)=+1652.1), the positive sign of the A value being in accord with the positive exciton chirality between the two long axes of the anthracene moieties in 1. The results demonstrate an ideal case of chiral exciton coupling in CD spectra, and provide evidence of the consistency between nonempirical CD exciton chirality and X-ray Bijvoet methods.
Formation of a Charge-Transfer Complex between the 1-Methyl-1-phenylethylperoxyl Radical and Pyridine during Decomposition of 1-Methyl-1-phenylethyl Hydroperoxide
Authors: Fukuzumi Shun-ichi , Ono Yoshio 
Published: July 2006

Abstract
The apparent rate constant for the self-reaction of 1-methyl-1-phenylethylperoxyl radicals (RO2.) in the presence of pyridine was determined from simultaneous measurements of the rate of oxygen generation and the concentration of the peroxyl radical during the decomposition of 1-methyl-1-phenylethyl hydroperoxide with lead dioxide. The apparent rate constant decreased markedly with an increase in the concentration of pyridine, which clearly demonstrates the low reactivity of RO2· in the presence of pyridine. This behavior is taken as evidence that the charge-transfer complex between the peroxyl radical and pyridine is formed and that the reactivity of complexed peroxyl radicals is much lower than that of uncomplexed peroxyl radicals. The equilibrium constant for the formation of the charge-transfer complex has been determined to be 0.55 M−1 at 293 K and the values of −ΔH and −ΔS were found to be 31 kJ mol −1 and 109 J mol−1 K−1, respectively.
Mechanism of the Photochemical Ring Expansion of N-Vinyl-2-pyrrolidone. Estimation of the Recombination-Time of Biradical
Authors: Shizuka Haruo , Ogiwara Toshio , Morita Toshifumi 
Published: July 2006

Abstract
The photochemical ring expansion of N-vinyl-2-pyrrolidone (NVP) has been carried out at 254 nm. The reaction quantum yield depends a great deal on the solvnet viscosity and temperature. The recombination time of the biradical of RP produced by Norrish type I fission was estimated to be ≈10−10 s by application of the Einstein and Smoluchowski-Debye equations. The spin inversion of the biradical in a solvent cage is also discussed according to Kaptein’s theory of the radical-pair mechanism.
ESR and ENDOR Studies of the Ion Pairs of Double-, Triple-, and Quadruple-layered [2.2]Paracyclophane Radical Anions and Alkali Metal Cations
Authors: Iwaizumi Masamoto , Kita Shouichi , Isobe Taro , Kohno Masahiro , Yamamoto Takamitsu , Horita Hisanori , Otsubo Tetsuo , Misumi Soichi 
Published: July 2006

Abstract
The radical anions of double-, triple-, and two kinds of quadruple-layered [2.2]paracyclophane XX\ewdot, XDX\ewdot, XDDX(C2h)\ewdot and XDDX(D2)\ewdot were examined by means of ESR and ENDOR spectroscopy. The spin distributions in these radical anions are largely polarized by interaction with counter ions. An MO calculation has been attempted to account for the observed ion-pairing effects. It is shown by the calculations that the observed ion-pairing effects can be explained by the ion-pair models where the cation is located above the center of the outermost benzene ring. It is also shown that the potassium ion migrates from one side of the radical molecule to the other in a loosely bound ion pair of XDX\ewdot in a 1,2-dimethoxyethane(DME)-tetrahydrofuran(THF) 1:1 mixed solvent, as in the ion pair of XX\ewdot with the potassium ion in DME-THF (2:1) which has been previously reported by Gerson et al. Such migration of cations in ion pairs was not observed for the quadruple-layered [2.2]paracyclo-phane radical anions.
Fluorescence and Laser Photolysis Studies on the Intramolecular Exciplex Systems in Micellar Solutions
Authors: Masuhara Hiroshi , Kaji Katsumi , Mataga Noboru 
Published: July 2006

Abstract
The behavior of intramolecular exciplex systems consisting of pyrene and N,N-dimethylaniline was studied in cationic, anionic and neutral micellar solutions. These systems are favorable for the study of photoinduced CT interaction in micellar systems, since (i) a pair of donor-acceptor is always solubilized in the micelle and (ii) the complicated effect of the intermolecular interaction can be prevented. No exciplex emission was detected and relative quantum yields as well as lifetimes were measured on the monomer fluorescence. The results are interpreted by assuming two solubilized forms in the micelle-water interface. Efficient quenching occurs in the dodecyltrimethylammonium chloride solution irrespective of the length of the methylene chain, suggesting a different solubilization from the cases of other detergents. The efficient quenching is ascribed to the rapid ion-pair formation in the micelle-water interface, which was directly demonstrated by the ns laser photolysis method.
The Structural Role of the Aluminum Ion in Alkali Aluminophosphate Glass Containing Less Than 50 mol% of P2O5
Authors: Kishioka Akira 
Published: July 2006

Abstract
Several series of alkali (Na and K) aluminophosphate glasses with a constant P2O5 content of less than 50 mol % were prepared. From the infrared absorption spectra of these glasses, and also from the paper chromatograms of aqueous solutions of these glasses, we obtained the following results: The PO43− ion increased with an increase in the amount of Al2O3 when the P2O5 content was kept constant. The PO43−/P2O5 ratio in the glass increased with an increase in the Al2O3 content, whereas it decreased with an increase in the P2O5 content. In the composition of 32.5 mol % of P2O5, the glass containing exclusively PO43−-type ions as a phosphate species was found. The PO43−/Al3+ ratio was smaller than unity in the case of a lower Al2O3 content and larger than unity in the case of a higher Al2O3 content. From these results, the structural role of the Al3+ ion can be revealed as follows: In the glass with a lower Al2O3 content, two kinds of Al3+ ions exist–(1) the Al3+ ion, which forms the P–O–Al linkage by the substitution of the P5+ ion in the P–O–P linkage, and (2) the Al3+ ion, which does not form such a linkage, whereas in the glass with a higher Al2O3 content all the Al3+ ions substitute the P5+ ion to form the P–O–Al linkage.
Evaluation of PAC, TAC, 2-IAC as Metallochromic Indicators in the EDTA Titrations of Nickel
Authors: Wada Hiroko , Nakazawa Osamu , Takada Hajime 
Published: July 2006

Abstract
The rates of color change of 2-(2-pyridylazo)-4-methylphenol (PAC), 2-(2-thiazolylazo)-4-methylphenol (TAC) and 2-(2-imidazolylazo)-4-methylphenol (2-IAC) during EDTA–nickel titration have been determined. The rate is a thousand times greater for TAC and 2-IAC than for PAC. From equilibrium considerations, the rate of color change and the color contrast change, an evaluation of PAC, TAC, and 2-IAC as metallochromic indicators for nickel is given. The optimum pH ranges with TAC and 2-IAC are from 6 to 7 and from 5 to 7, respectively, at 80 °C. With PAC, the titration should be conducted with boiling at pH 4–5. 2-IAC is the best indicator due to the good visual color contrast and the wide pH range over which it is applicable.
Preparation of Optically Active 1,3-Diphenyl-1,3-propanediamine (dppn) and the Circular Dichroism of trans-[CoCl2-(S,S-dppn)2]+ and [Co(S,S-dppn)3]3+
Authors: Arakawa Sumio , Kashiwabara Kazuo , Fujita Junnosuke , Saito Kazuo 
Published: July 2006

Abstract
1,3-Diphenyl-1,3-propanediamine (dppn) was prepared from 1,3-diphenyl-2-propen-1-one. The meso and racemic isomers were isolated. The racemate was resolved into enantiomers with (+)D-di-O-benzoyltartrate. The absolute configuration of the free diamine was determined by comparing the circular dichroism (CD) spectrum of trans-[CoCl2(S,S- or R,R-dppn)2]+ with that of trans-[CoCl2(R,R-2,4-pentanediamine)2]+. The absolute configurations of Δ- and Λ-[Co(S,S-dppn)3]3+ were also assigned on the basis of the CD spectra.
Infrared Spectra of 1,3-Butadiene Adsorbed on Alumina-supported Metal Catalysts at Various Temperatures
Authors: Soma Yuko 
Published: July 2006

Abstract
The infrared spectra of 1,3-butadiene adsorbed on Pd, Ni, and Co catalysts were measured while changing the adsorption temperature. These catalysts behaved differently in butadiene adsorption, and π-adsorbed butadiene was the major adsorbed species below 0 °C on Pd and Ni. This π-species was easily hydrogenated to produce butene at the same temperature.
Determination of Magnetic Susceptibilities of Diamagnetic Liquids by an Improved Viscometer Method
Authors: Sueoka Kazuo , Ikeda Toshio 
Published: July 2006

Abstract
An improved viscometer method is presented for the determination of the magnetic susceptibility of a liquid with a complete exclusion of the oxygen effect. The method was found to be excellent even in determining the magnetic susceptibilities of diamagnetic liquids, giving results accurate to within ±0.05%. The influence of air (or oxygen) was also discussed.
Hydrogen Isotope Effect on the Radical Addition of the Hydrogensulfite Ion to Allyl Alcohol in Aqueous Solutions
Authors: Miyata Teijiro , Sakumoto Akihisa , Washino Masamitsu 
Published: July 2006

Abstract
A study of the radiation-induced addition of HSO3− to allyl alcohol was carried out in D2O–H2O mixtures. It was found that a linear relationship held between the apparent rate constant of NaHSO3 consumption and the atom fraction of deuterium in the mixture, and that the hydrogen atom abstraction from HSO3− by HOCH2\dotCH-CH2SO3− was the rate-determining step. The kinetic isotope effect of this abstraction was 4.38.
Rhodium Complex Catalyzed Hydrogenation of α,β-Unsaturated Aldehydes to Unsaturated Alcohols
Authors: Mizoroki Tsutomu , Seki Katsumi , Meguro Shun-ichi , Ozaki Atsumu 
Published: July 2006

Abstract
Rhodium complexes were found to be effective in catalyzing selective hydrogenation of cinnamaldehyde to cinnamyl alcohol in the presence of strongly basic amine such as triethylamine or N-methylpyrrolidine under oxo reaction conditions. The selectivity of analogous hydrogenation of aliphatic unsaturated aldehyde was poorer than that of aromatic aldehyde. When a catalytic amount of triphenylphosphine was added, the selectivity was drastically changed to exclusive formation of hydrocinnamaldehyde. In order to elucidate the nature of rhodiumamine interaction, Rh2Cl2(CO4) was immobilized on a cross-linked chloromethylated polystyrene which was functionalized with pyrrolidine, the polymer amine acting as a tertiary amine. The polymer–rhodium complex was found to be stable and to effect the selective hydrogenation of cinnamaldehyde, while addition of triphenylphosphine seemed to liberate the rhodium complex from the polymer. It is concluded that a rhodium–amine–carbonyl complex is responsible for the selective hydrogenation of α,β-unsaturated aldehyde to the unsaturated alcohol.
Preparation of 5,5-Bis(ethoxycarbonyl)-5,6-dihydro-3,7-diaryl-4H-1,2-diazepines and Their Halogenations
Authors: Tsuge Otohiko , Kamata Kichinosuke , Yogi Seiichi 
Published: July 2006

Abstract
5,5-Bis(ethoxycarbonyl)-5,6-dihydro-3,7-diaryl-4H-1,2-diazepines (4) were prepared by the condensation of α-bromoacetophenone azines with diethyl malonate in the presence of sodium ethoxide. Halogenation of 4 afforded 7,7-bis(ethoxycarbonyl)-2,5-diaryl-3,4-diazanorcaradiene, 4,6-dihalodihydrodiazepines, 1-halodiazanorcaradienes, and/or 4,4,6,6-tetrachlorodihydrodiazepine, whose relative yields depended upon the reaction conditions. Dehalogenation of the halogenated products was also investigated.
The Absolute Configuration of Sepiapterin
Authors: Matsuura Sadao , Sugimoto Takashi , Tsusue Motoo 
Published: July 2006

Abstract
The absolute configuration of sepiapterin was determined to be 2-amino-7,8-dihydro-6-(S)-lactoyl-4(3H)pteridinone from an analysis of the l-lactic acid produced from sepiapterin by oxidation cleavage in a sodium borate solution.
The Intramolecular Hydrogen Abstraction Reaction in the Photolysis of Aminated 1,4-Naphthoquinones
Authors: Maruyama Kazuhiro , Kozuka Tadashi , Otsuki Tetsuo 
Published: July 2006

Abstract
Photolysis of aminated 1,4-naphthoquinones 1a–c in liquid phase was investigated. After photolysis and successive autoxidation, 2-(3-pyrrolin-1-yl)-1,4-naphthoquinone 1a gave 2-(1-pyrrolyl)-1,4-naphthoquinone 3 quantitatively. However, in the reaction, 2-(1-pyrrolydinyl)-1,4-naphthoquinone 1b and 2-(2-methoxycarbonyl-1-pyrrolidinyl)-1,4-naphthoquinone 1c afforded the corresponding hetero-ring opened products; 2-(4-oxobutylamino)-1,4-naphthoquinone 5 and 2-(4-methoxycarbonyl-4-oxobutylamino)-1,4-naphthoquinone 8 in good yields. Possible mechanisms for the formation of 3, 5, and 8 are presented.
A Semi-empirical NDDO Method for All-valence-electron Systems. II. Extension to Compounds Containing Nitrogen and/or Oxygen
Authors: Kikuchi Osamu , Maeda Akira 
Published: July 2006

Abstract
A semi-empirical NDDO method is extended to compounds containing nitrogen and/or oxygen, and is applied to the evaluation of the molecular geometries and excitation energies of the compounds and of the heats of reactions relating to them. The agreement between the calculated and observed values is comparable with that previously attained for hydrocarbons except for the conformations of NH3 and CH3NH2.