bluuebunny/crossref_metadata_2025_split huggingface dataset:
13C Spin-lattice Relaxation and Molecular Structure. II. The Application of 13C Spin-lattice Relaxation Times (T1) to Assignments of Signals in the Proton-decoupled 13C NMR Spectrum of 5-Ethyl-5H-dibenzophosphole
Authors: Hayashi Teruyuki , Nakanishi Hiroshi 
Published: July 2006

Abstract
The spin-lattice relaxation times (T1) of the 13C nuclei in 5-ethyl-5H-dibenzophosphole (1) were studied. The 13C NMR signals of the quarternary carbons of 1 in the aromatic region, whose assignments are very difficult by other techniques, were successfully assigned by means of the spin-lattice relaxation method. The dipolar relaxation terms and their reciprocal values were calculated by the use of the internuclear-distances between the carbon nuclei and hydrogen or phosphorus ones, and were compared with the observed T1 values. It was found by studying the observed T1’s of the ethyl group in 1 that the rotation around the C–P bond is more strongly restricted than that around the C–C single bond.
α,β-Unsaturated Carboxylic Acid Derivatives. XIV. The Synthesis and Reduction of Diels-Alder Adducts from Ethyl 3-Nitro-2-alkenoates and Cyclopentadiene
Authors: Shin Chung-gi , Kosuge Yasuhiro , Yamaura Masanori , Yoshimura Juji 
Published: July 2006

Abstract
The Diels-Alder reactions of cyclopentadiene with ethyl (E)- and (Z)-3-nitrocrotonate were carried out to give only the (2+4)-nitro adduct as a mixture of three diastereomers, while that of the diene with ethyl (Z)-3-nitrocinnamate gave two kinds of cycloaddition products, (2+2)- and (2+4)-nitro adducts. All the nitro adducts were reduced with aluminum-amalgam to give the corresponding mono- and dihydroxyamino compounds, in which vicinal endo-ethoxycarbonyl-endo-hydroxyamino derivatives cyclized readily to give tricyclic compounds containing isoxazolidinone ring. The stereochemistry of all the new compounds were established on the basis of IR and NMR spectroscopic analyses.
Polyelectrolyte Complexes of Chitosan with Sodium Carboxymethyldextran
Authors: Fukuda Hiroshi , Kikuchi Yasuo 
Published: July 2006

Abstract
Mixing of chitosan with sodium carboxymethyldextran having opposite charge gave rise to the formation of novel water-insoluble precipitates. The mole ratios of N/COO− in the polyelectrolyte complexes thus prepared were estimated to be 0.248–1.658. It was found that pH, mole ratio of N/Na and the order of mixing play an important role in determining the composition ratio of N/COO− in the polyelectrolyte complexes. IR spectroscopic studies, blood clotting test, elementary analyses, the color reaction with Toluidine Blue and studies on solubility of polyelectrolyte complexes revealed that there is no noticeable interactions between –COOH groups and –OH groups. However, the –NH3+ groups in chitosan participate in the binding with carboxymethyldextran, probably through its –COO− groups, in the polyelectrolyte complexes. It seems that the number of binding sites between –NH3+and -COO− groups in the polyelectrolyte complexes at pH 3.0 is smaller than those prepared at pH 6.5. Both the polyelectrolyte complexes prepared at pH 3.0 and 6.5 suppressed the coagulation of blood. This anti-thrombogenic property should be related to elution of anti-thrombogenic carboxymethyldextran.
Formation of Cyanonitro-3-cyclohexen-1-ones in the Reaction of Tetramethylbenzonitriles with Fuming Nitric Acid
Authors: Suzuki Hitomi , Inoue Akiyoshi , Koge Mamie , Hanafusa Terukiyo 
Published: July 2006

Abstract
The reaction of 3,4,5,6-tetramethylbenzene-1,2-dicarbonitrile with fuming nitric acid at room temperature yielded appreciable amounts of 3,4-dicyano-5,6-dinitro-2,2,5,6-tetramethyl-3-cyclohexen-1-one and 3,4-dicyano-6-hydroxy-5-nitro-2,2,5,6-tetramethyl-3-cyclohexen-1-one in addition to the expected side-chain substitution products. 2,3,5,6-Tetramethylbenzonitrile similarly gave 3-cyano-5,6-dinitro-2,2,4,5-tetramethyl-3-cyclohexen-1-ones as minor products. The structures of these nitro ketones have been assigned by spectral methods and a probable mechanistic pathway to their formation is presented.
Sulfur-Carbonyl Interaction in Rigid β-Keto Sulfides
Authors: Tabushi Iwao , Tamaru Yoshinao , Yoshida Zen-ichi 
Published: July 2006

Abstract
The electron donating ability of sulfur to a positively charged center through space was examined by means of ultraviolet spectroscopy. 7-Thiabicyclo[2.2.1]heptan-2-one and -2,5-dione exhibited finely separated charge transfer band (from divalent sulfide to carbonyl) at 260 nm in UV spectra, the longest wave-length for S–Cco charge transfer band so far reported. The assignment of these CT bands was confirmed by comparison with relevant reference compounds.
Synthesis of Indole Derivatives by Cu2O-Catalyzed Cyclization of o-(α-Cyanoalkyl)phenyl Isocyanides and o-[α-(Methoxy-carbonyl)alkyl]phenyl Isocyanides
Authors: Ito Yoshihiko , Inubushi Yoshinori , Sugaya Toru , Kobayashi Kazuhiro , Saegusa Takeo 
Published: July 2006

Abstract
o-(Cyanomethyl)phenyl isocyanide and o-(methoxycarbonylmethyl)phenyl isocyanide were heated with a catalytic amount of Cu2O in benzene to give 3-cyanoindole and 3-(methoxycarbonyl)indole in 86 and 92% yields, respectively. Lithiations of o-(cyanomethyl)phenyl isocyanide and o-(methoxycarbonylmethyl)phenyl isocyanide with butyllithium at −78 °C followed by the reaction with alkyl halides such as methyl iodide, allyl bromide, butyl bromide, benzyl bromide and methyl α-bromoacetate afforded the corresponding o-(α-cyanoalkyl)phenyl isocyanides and o-[α-(methoxycarbonyl)alkyl]phenyl isocyanides. o-(α-Cyanoalkyl)phenyl isocyanides and o-[α-(methoxycarbonyl)alkyl]phenyl isocyanides thus obtained were also cyclized by Cu2O catalyst producing 3-alkyl-3-cyano-3H-indoles and 3-alkyl-3-(methoxycarbonyl)-3H-indoles, respectively, in moderate yields.
Stereochemistry of Nucleophilic Addition Reactions. 6. Synthesis of Isoxazoline N-Oxide Derivatives from Methyl 4,6-O-Benzylidene-2,3-dideoxy-3-nitro-α-d-erythro-hex-2-enopyranoside with Some S-Ylides
Authors: Sakakibara Tohru , Sudoh Rokuro 
Published: July 2006

Abstract
In the reactions of dimethyloxosulfonium methylide, dimethylsulfonium ethoxycarbonylmethylide, and dimethylsulfonium phenacylide with the title compound, axial attack predominates over equatorial attack, particularly in the case of dimethylsulfonium phenacylide equatorial attack being no longer observed. Axial attack afforded exclusively 1,4-addition products (isoxazoline N-oxide derivatives), whereas equatorial attack gave only 1,2-addition products (cyclopropane and stabilized ylide, respectively). Discussion is given on such high selectivities.
The Thermal Decomposition Process of Calcium Sulfite
Authors: Matsuzaki Ryoko , Masumizu Hagio , Murakami Nagisa , Saeki Yuzo 
Published: July 2006

Abstract
The thermal decomposition of calcium sulfite at temperatures below 880 °C in an argon stream was examined. Also, the reaction between calcium sulfate and calcium sulfide, which were formed during the decomposition process of calcium sulfite, was examined. The thermal decomposition process of calcium sulfite can be represented as follows: on heating calcium sulfite, the reaction, CaSO3→CaO+SO2, occurs above about 600 °C. Above about 680 °C, the reaction, 4CaSO3→3CaSO4+CaS, occurs besides the above reaction. Furthermore, the reaction between calcium sulfate and calcium sulfide which are formed during the decomposition process of calcium sulfite, 3CaSO4+CaS→4CaO+4SO2, occurs above about 780 °C.
Analysis of the NMR Line Shape Dually Modulated by the Chemical Exchange and by the Scalar Coupling Relaxation. 13C NMR Spectrum of the Trimethylaluminum Dimer
Authors: Yamamoto Osamu , Yanagisawa Masaru 
Published: July 2006

Abstract
13C methyl signals of the trimethylaluminum dimer, broadened by the chemical exchange and the scalar coupling interaction with 27Al, were analyzed in order to obtain the rates of the bridge-terminal exchange of the methyl groups. The exchange rates were compared with those obtained from the 1H resonance, and a good agreement was obtained. A brief discussion is given of some advantages and difficulties of the analysis.
The Anodic Voltammetry of Deoxyribonucleic Acid at a Glassy Carbon Electrode
Authors: Yao Toshio , Wasa Tamotsu , Musha Soichiro 
Published: July 2006

Abstract
Deoxyribonucleic acid was oxidized in two steps at a glassy carbon electrode. The peak currents had the characteristics of adsorption currents, but if the surface of the electrode was not fully covered by the adsorbed polynucleotide molecule the peak currents had rather the characteristics of diffusion-controlled currents.
Synthesis of 4-Methyl-1,2-oxathiin 2,2-Dioxide
Authors: Akiyama Tetsuo , Sugihara Masaki , Imagawa Takeshi , Kawanisi Mituyosi 
Published: July 2006

Abstract
The reaction of isoprene with the SO3-DMF complex afforded isoprene δ-sultone (3) in a 48% yield. The addition of bromine to 3 gave a dibromo product (4) and successive treatment of 4 with triethylamine in benzene and with triethylamine in the presence of silver tetrafluoroborate gave 4-methyl-1,2-oxathiin 2,2-dioxide in an 18% yield.
Synthetic Photochemistry. XII. The Sensitized Photooxidation Reaction of Some Spirocyclic Derivatives of Vinylcyclopropanes
Authors: Takeshita Hitoshi , Hatsui Toshihide , Iwabuchi Ryuta , Itoh Shinji 
Published: July 2006

Abstract
The dye-sensitized photooxidation of the Diels-Alder adducts prepared from 2-substituted tropones and spiro[2.4]hepta-4,6-diene was caried out. A marked difference in the reactivities was observed between the two structural types of adducts; 3,3-ethylene derivatives gave nor-epoxides, but 5,5-ethylene derivatives resulted in the recovery of the starting materials.
The Reaction of Decaborane with Carbonyl Compounds
Authors: Tanaka Toyosuke , Matsuda Tsuneo , Kimijima Katsunori , Iwasaki Yuichi 
Published: July 2006

Abstract
Decaborane formed adducts with cyclohexanones, 2-octanone, acetaldehyde, or acetone, which were cleft in the presence of water into alcohols, boric acid, and hydrogen. Olefins and boroxins as secondary products were identified.
New Synthesis of γ-Hydroxyglutamic Acid
Authors: Kusumi Takenori , Kakisawa Hiroshi , Suzuki Shinnichiro , Harada Kaoru , Kashima Choji 
Published: July 2006

Abstract
γ-Hydroxyglutamic acid was prepared easily via 3-ethoxycarbonyl-5-methoxycarbonyl-2-isoxazoline, which was the 1,3-dipolar adduct of methyl acrylate and ethyl cyanoformate N-oxide.
Bromine-81 Nuclear Quadrupole Resonance and Aluminum-27 Nuclear Magnetic Resonance in AlBr3 Complexes
Authors: Okuda Tsutomu , Ishihara Hideta , Yamada Koji , Negita Hisao 
Published: July 2006

Abstract
The Zeeman effect on 81Br NQR and the quadrupole effect on 27Al NMR in l·AlBr3 complexes (L=KBr, POBr3, and H2S) were studied at room temperature. It was found that the 27Al quadrupole-coupling constant for these complexes decreases with decreasing coupling constant of the 81Br atom in –AlBr3 and that the atomic arrangement about the Al atom has C3V symmetry in POBr3·AlBr3 and H2S·AlBr3. In the latter complex, H2S molecule is reorientated at room temperature. The amount of charge transfer in these complexes was estimated on the basis of the Townes-Dailey theory and the bond angle ∠Br–Al–Br was found to depend on the amount of the charge transfer. The temperature dependence of the 81Br NQR frequencies was observed in order to obtain information about molecular motion in H2S·AlBr3 and POBr3·AlBr3.
Generation of Olefin Metathesis Catalysts from W(CO)6 and Group IVa Metal Halides under Photochemical Conditions
Authors: Nagasawa Megumu , Kikukawa Kiyoshi , Takagi Makoto , Matsuda Tsutomu 
Published: July 2006

Abstract
Irradiation of a solution of W(CO)6 and group IVa metal halides in benzene by UV light gave the olefin metathesis catalysts, of which the combination W(CO)6–TiCl4 was the most effective. Association of the coordinatively unsaturated W(CO)5 and TiCl4 was suggested to be a key step in the formation of a catalytically active complex. A survery was also made for other W(CO)6–MXn combinations for photo-generation of metathesis catalyst.
Electrostatic Force Study with Floating Wave Function. Comparative Study on the Origins of the Molecular Shapes of CH3+ and NH3
Authors: Nakatsuji Hiroshi , Matsuda Kazuo , Yonezawa Teijiro 
Published: July 2006

Abstract
The force and density origins of the molecular shapes of CH3+ and NH3 are studied comparatively on the basis of the floating wave functions which satisfy the Hellmann-Feynman theorem for the forces acting on the terminal protons. It is confirmed quantitatively that the previous concepts of the electrostatic force (ESF) theory correctly grasp the origins of the molecular shapes. Namely, the density-guiding rule which states that the nuclei are pulled in the direction of the electron-cloud reorganization i.e., the electron-cloud preceding and incomplete following), is verified as the density origin. The force origin which is the AD and EC forces reflects and quantifies the density origin. The roles of the other forces are also easily predicted by the ESF theory.
The Effects of Halide Ions on the Radiation-induced Decoloration of Azo and Anthraquinone Dyes in N2O-saturated Aqueous Solutions
Authors: Suzuki Nobutake , Tokunaga Okihiro , Washino Masamitsu 
Published: July 2006

Abstract
The radiation-induced decoloration of azo and anthraquinone dyes was studied in N2O-saturated aqueous solutions containing halide ions. In the N2O-saturated solutions, the decoloration yield, G(–Dye), increased markedly upon the addition of Br− and I−, which are efficient scavengers of the OH radical. In the nitrogensaturated solutions, however, the G(–Dye) decreased upon the addition of Br− and I−. Such an increase in the G(–Dye) upon the addition of Br− and I− in the N2O-saturated solutions is mainly attributable to the attacks of the halide radical anions, Br2− and I2−, on the ring structure of the dyes. On the other hand, the G(–Dye) was not changed upon the addition of Cl− in the N2O-saturated solution. This may be attributable to the very slow rate of the formation of Cl2− in a neutral solution.
Phase Equilibria in the Lu2O3–V2O3–V2O5 System at 1200 °C
Authors: Kitayama Kenzo , Katsura Takashi 
Published: July 2006

Abstract
The phase equilibria in the Lu2O3–V2O3–V2O5 system were established at 1200 °C. In this system, Lu2O3, LuVO3 LuVO4, V2O3, V3O5, V4O7, V5O9, V6O11, V7O13, and three new compounds Lu7V3O16, Lu2V2O7, and LuV4O8 are stable. LuVO4, V2O3, VO2, Lu7V3O16, Lu2V2O7, and LuV4O8 have non-stoichiometric compositions. The relationships between the composition and the −logPO2 values of the solid solutions were obtained from the thermogravimetric results. On the basis of the phase equilibria, the standard Gibbs free energies of several reactions were determined. The spacings, relative intensities, and densities of new compounds were also determined.
Liquid-phase Oxidation of Hydrocarbons with Molecular Oxygen. I. The Effects of Metal Ions and Their Ligands on Product Distribution in the Oxidation of Tetralin in Acetic Acid
Authors: Mizukami Fujio , Imamura Juichi 
Published: July 2006

Abstract
Metal-ion catalyzed oxidation of tetralin and metal-ion catalyzed decomposition of α-tetralin hydroperoxide (THP) were carried out in acetic acid in both the presence and absence of an additive. It was found that the rate-determining step in the oxidation of tetralin is the decomposition of THP. The results also suggest that the decomposition of THP with cobalt catalysts proceeds by the inner-sphere mechanism. In the oxidation of tetralin catalyzed by first-transition-metal ions, excepting vanadium, cobalt showed the highest activity and the lowest selectivity of hydroperoxide, and chromium showed the highest ratio of α-tetralone to α-tetralol (On/Ol). The order of the activities of metal acetates in producing oxidation is in agreement with that of the activities of metal acetates in producing decomposition. Such agreement was also found for Co(acac)3, Cr(acac)3, Mn(acac)2, and Fe(acac)3 catalysts. For oxidation with Co(OAc)2·4H2O and Cr(OAc)3, the product distributions were examined for various conversions of tetralin. In the both cases, the On/Ol ratios increase with increasing tetralin conversion. However, the mechanisms responsible for the increase in the On/Ol ratio appear to be different.
Metalloporphyrins. III. Photoinduced Acylamination of Zinc Porphyrins by Use of Acyl Azides
Authors: Ichimura Kunihiro 
Published: July 2006

Abstract
Visible light irradiation of a solution of zinc octaethylporphin (ZnOEP) in the presence of acyl azide gives zinc complex of 5-acylamino-2,3,7,8,12,13,17,18-octaethylporphin together with a small amount of zinc complex of 21-acylamino-2,3,7,8,12,13,17,18-octaethylporphin. Zinc 5,10,15,20-tetraphenylporphin (ZnTPP) is coverted into zinc complex of 21-acylamino-5,10,15,20-tetraphenylporphin in a similar way. The pyrolysis of the N-acylaminated ZnOEP affords the rearrangement product in addition to ZnOEP, while N-acylaminated ZnTPP is converted into ZnTPP on heating. The spectroscopic properties of these photoproducts are given.
The Reactions of a Variety of Diazo Compounds with Sulfur Dioxide in Ethanol
Authors: Tanabe Toyoshige , Nagai Toshikazu 
Published: July 2006

Abstract
The reactions of several diazomethanes bearing a variety of substituents with sulfur dioxide were carried out in ethanol. The reaction of a diazomethane possessing an electron-releasing group gave the olefin as the major product. On the contrary, the ethyl ethers were predominantly afforded from the reactions of the diazomethanes containing an electron-withdrawing group. Moreover, the ethyl alkanesulfonates were obtained in the cases bearing the substituent of an intermediate electronic character. The observed product distribution is interpreted in terms of the nucleophilicity of the α-carbon atom of the diazomethane: the preference of the formation of sulfene by the electrophilic attack of SO2 on the diazomethane to the acid-catalyzed decomposition by ethyl hydrogen sulfite reflects the nucleophilicity of the α-carbon atom in the diazomethane.
Syntheses and Reactions of 10-(2,2′-Biphenylylene)-9-phenanthrone Derivatives and Some Consideration of Ethyl Isomers in Their Analogous Series
Authors: Ooya Takao , Minabe Masahiro , Suzuki Kazuo 
Published: July 2006

Abstract
The Wagner-Meerwein rearrangement of 9′-methyl-9,9′-bifluoren-9-ol yielded 10-(2,2′-biphenylylene)-9-methylenephenanthrene. Ozonolysis of the phenanthrene afforded 10-(2,2′-biphenylylene)-9-phenanthrone. This pinacolone was converted into 2′-(9-fluorenyl)biphenyl-2-carboxylic acid. Oxidation of 4,9′-bifluoren-9-one, which was obtained by ring closure of the acid, gave 9′-hydroxy-, 9′-benzyl-, and 9′-benzyloxy-4,9′-bifluoren-9-one. Isomers of 2,2′-diethyl-9,9′-bifluorene-9,9′-diol were obtained by reduction of 2-ethyl-9-fluorenone. The pinacols were rearranged to the corresponding pinacolones, which were cleaved into carboxylic acids. The structural assignment of these isomers was made by spectral analyses.
The Reactions of Group V Metal Amide with Sulfur Dioxide
Authors: Ando Fumio , Koketsu Jugo , Ishii Yoshio 
Published: July 2006

Abstract
Tris(dialkylamino)-arsines (I), -stibines (II), and -bismuthines (III) react with sulfur dioxide to give the corresponding tetraalkylsulfurous diamides and the corresponding metal oxides or polymers containing the metals. The reactivity of these metal amides in view of the fastness of the initial reactions follows the order III&gt;II&gt;I, however, the yields decrease in the order I&gt;II&gt;III. Tris(dialkylamino)phosphines, on the other hand, give hexaalkylphosphoric triamides and hexaalkylphosphorothioic triamides in a ratio of 2 : 1. The reactivity of the various phosphorus compounds toward sulfur dioxide increases with increasing nucleophilicity of the phosphorus atom; P(NEt2)3&gt;Ph2PNEt2&gt;Ph2POEt&gt;PhP(OEt)2&gt;P(OEt)3. The reaction mechanism of compounds (I), (II), and (III) with sulfur dioxide is different from that of the phosphorus amides.
Synthetic Studies on Quinoxaline Antibiotics. Synthesis of Quinoxaline-2-carbonyl Tetradepsipeptide Derivatives Related to Triostin A
Authors: Shin Masaru , Inouye Ken , Otsuka Hideo 
Published: July 2006

Abstract
The synthesis is described of four quinoxaline-2-carbonyl (Qxc) tetradepsipeptide derivatives, Qxc–d-Ser[Z–MeCys(Bzl)–MeVal]–Ala–OH, Qxc–d-Ser[Bpoc–MeCys(Bzl)–MeVal]–Ala–OBut (2), Qxc-d-Ser(Z–MeVal)–Ala–MeCys(Bzl)–OH, and Qxc–d-Ser(Bpoc–MeVal)–Ala–MeCys(Bzl)–OBut, corresponding to the partial structure of a quinoxaline antibiotic, triostiin A. The Qxc group was introduced at the dipeptide or tripeptide stage with Qxc–ONp as acylating agent. Qxc–d-Ser–Ala–OBut and Qxc–d-Ser–Ala–MeCys(Bzl)–OBut were acylated with Z–MeVal–OH by using p-toluenesulfonyl chloride as activating agent to give the desired depsipeptides in excellent yields, whereas the acylation with Bpoc–MeVal–OH by the same procedure was unsuccessful. The latter could be achieved by the N,N′-carbonyldiimidazole method, though the yields were relatively low. The treatment of compound 2 with an aqueous acetic acid–formic acid mixture for removal of the Bpoc group brought about concomitant formation of cyclo[–MeCys(Bzl)–MeVal–].
Polymeric Alkoxyalkylaluminum Compounds by Novel Reductive Cleavage of Saturated Cyclic Ethers. A New Organometallic Reagent in Organic Synthesis
Authors: Sumitani Mitsuhiro , Kanemitsuya Kazuhiko , Yasuda Hajime , Tani Hisaya 
Published: July 2006

Abstract
Insertion of aluminum to the C–O–C bond of saturated cyclic ethers by the HgCl2–ZnCl2–MeI catalyst system led to the reductive cleavage of 5, 6, and 7 membered ring ethers to give polymeric alkoxyalkylaluminum compounds. The relative rate of the reaction was increased in the order of tetrahydrofuran, 3-methyltetrahydrofuran, 2-methyltetrahydrofuran, 2,5-dimethyltetrahydrofuran, tetrahydropyran, oxepane, 7-oxabicyclo[2.2.1]-heptane, and 2-methyltetrahydropyran. The cleaved cyclic ethers are bonded with aluminum atoms bifunctionally and the resulting polymeric aluminum compound gave dideuterio alcohols upon deuterolysis. Addition reaction of allyl halides and reduction of chloral with the aluminum compound provided a novel route for the preparation of unsaturated alcohols.
Magnitude of Mercury Levels in Fish Muscle Tissue from South Carolina Waters
Authors: Koli Andrew K , McClary Edward 
Published: July 2006

Abstract
Many of the world’s great gastronomic materpieces are based on fish from both freshwater and saltwater. The danger for human health, due to fish consumption, has been very well recognized. A survey of mercury residues in freshwater fish was undertaken to see if the problem of the magnitude of mercury contamination was evident in the South Carolina Fishery. These investigations were initiated to determine mercury levels in fish from a variety of South Carolina Waters. Samples of fish from freshwater sources all over the state of South Carolina were collected during 1974 and 1975. The species composition of the collections generally reflects the fish populations of the water sampled. Mercury determinations were made on 100 samples of fish taken from 22 locations covering 46 South Carolina counties. Triplicate samples of fish tissues were analyzed using flameless atomic absorption procedures. Findings of this report are that magnitude of mercury levels of fish from Lake Jocassee and Edisto River have been found to be higher than other waterways surveyed. Mercury levels exceeding the U. S. Food and Drug Administration guideline of 0.5 ppm have been found in Brown Trout, Pike and Mudfish. Different patterns of mercury concentration occurred between different tissues. Larger fish contain higher concentration of mercury than do smaller fish of the same species.
CNDO/2 Calculations of MeSEt, MeS-n-Pr, MeS-n-Bu, (Et)2S, EtS-n-Pr, EtS-n-Bu, and (n-Pr)2S
Authors: Ohsaku Masaru , Bingo Norihisa , Fujiwara Hiroshi , Murata Hiromu 
Published: July 2006

Abstract
CNDO/2 sp calculations were carried out for MeSEt, MeS-n-Pr, MeS-n-Bu, (Et)2S, EtS-n-Pr, EtS-n-Bu, and(n-Pr)2S. The stable conformations of these molecules were discussed.