bluuebunny/crossref_metadata_2025_split huggingface dataset:
Modified Preparation of Sodium Guaiazulenide and Reaction of the Reagent with 3-Formylguaiazulene
Authors: Kurokawa Shinji 
Published: July 2006

Abstract
As a modification for facilitating small-scale reactions, sodium N-methylanilinide was prepared from sodium hydride and N-methylaniline instead of by the usual method from sodium, N-methylaniline, and naphthalene (as assistant). Sodium N-methylanilinide, made by this procedure, was successively converted to sodium guaiazulenide, the formation of which was checked by tracing known reactions. The reaction of the reagent with 3-formylguaiazulene was also studied, and found to yield 4-substituted 2-formyl-1,4-dihydroguaiazulene and 6-substituted 2-formyl-3,6-dihydroguaiazulene. In this case, nucleophilic addition of guaiazulenide anion occured not at the carbonyl group but at the 6- and 8-positions of the seven-membered ring of formylguaiazulene, accompanied by formyl group and hydrogen migrations.
A Highly Stereoselective Synthesis of Trisubstituted Ethylenes from α-Trialkylsilyl Ketones
Authors: Obayashi Michio , Utimoto Kiitiro , Nozaki Hitosi 
Published: July 2006

Abstract
A novel procedure for preparing trisubstituted ethylenes stereoselectively is based on the reaction of α-trialkylsilyl-substituted ketones with alkyllithium reagents and on the following highly discriminative elimination of the silyl and oxido (or hydroxyl) groups from the resulting adducts. The syn-elimination of both groups is observed under basic conditions, while the reaction proceeds in anti-fashion on acid treatment. Furthermore α-trimethylsilylated ketones are shown to be readily obtained from 2-trimethylsilyl-2,3-dialkyloxiranes. The reaction sequence is applied to the stereoselective synthesis of tetrahomonerol which has been obtained from the codling moth.
A Theoretical Treatment of the Difference in the Fragmentation of Urea and Acetamide
Authors: Takagi Tsutomu , Oiwa Masayoshi 
Published: July 2006

Abstract
The difference in the hydrogen migration in urea and acetamide under electron impact has been discussed from the standpoint of the all-valence electron semi-empirical SCF-MO theory (CNDO/2). The features of the molecular ion in the ground state and the hydrogen-migration models for both compounds were estimated based on the variations in the total and the partitioned energies. The variation in the total energy with the hydrogen migration in urea was smaller than that in acetamide. Moreover, the bonding interaction between carbon and nitrogen becomes weak; the cleavage of the migrated molecular ion to NH3 was predicted. On the other hand, the weak bonding interaction between carbon and carbon in acetamide does not change through the migration of hydrogen. It is predicted that the α-cleavage in the C–C bond will occur in preference to the migration of hydrogen. Finally, in acetamide, it was found that the possibility of the migration of hydrogen is lower than that in urea, judging from the variations in the total and the partitioned energies.
Electron Spin Resonance Study of the Pyramidal Geometry around the Tervalent Carbon Atom of the Bicyclo[2.1.1]hexan-5-yl Radical
Authors: Kawamura Takashi , Hayashida Shigeru , Yonezawa Teijiro 
Published: July 2006

Abstract
The bicyclo[2.1.1]hexan-5-yl and the 5-deuteriobicyclo[2.1.1]hexan-5-yl radicals have been examined using ESR. A comparison of the spectra confirmed that geometry around C5 is pyramidal and showed highly stereoselective long-range spin-transfer from C5 to the endo proton on C6; a(H6endo)=28.22 and a(H6exo)=0.49 G. A potential curve for the out-of-plane bending motion of the C5–H5 bond, selected from the trial curves gave a reasonable simulation of the temperature dependence and isotope effects on a(H5) and a(H6endo). The curve has two minima with a relatively low barrier to inversion; the geometry of the C5–H5 bond bent in the exo direciton has been estimated as approximately 0.9 kcal/mol more stable than that with the C5–H5 bond located in the endo direction.
Studies on Biologically Active Pteridines. I. The Synthesis of 6-(1R)[and (1S)](1-Hydroxyethyl)- and 6-(1S)and (1S)]-(1,2-Dihydroxyethyl)-2-amino-4-hydroxypteridines
Authors: Sugimoto Takashi , Matsuura Sadao 
Published: July 2006

Abstract
2-Amino-4-hydroxy-6-[(1S)-1, 2-dihydroxyethyl] pteridine has been synthesized by the condensation of 2,4,5-triamino-6-hydroxypyrimidine and d-threose phenylhydrazone, followed by oxidation of the intermediate carried out by adding the condensate to a mixture of K3[Fe(CN)6], KI, and H2O2 in an acidic solution. The 6-(1R)-1,2-dihydroxyethyl isomer and the 6-(1R) [and (1S)] -1-hydroxyethyl analogues have also been synthesized in a similar way. By applying the present method, biopterin has been obtained in 28% yield.
Continuous Removal of Heavy Metals by the Lime Sulfurated Solution (Calcium Polysulfide) Process
Authors: Aratani Toshiro , Yasuhara Shigeki , Matoba Hitoshi , Yano Takeo 
Published: July 2006

Abstract
A continuous wastewater treatment system was developed for the Lime Sulfurated Solution Process which had already been tested in a batch, stirred tank and ascertained to be an effective chemical precipitation process. The removability of heavy metals was investigated with the continuous treatment system, consisting of a plant composed of H2S desorber, reactor, thickener, sand filter, and H2S desorber. The sulfide ion dissolved in treated water was desorbed as H2S by a mixed gas of air and CO2 and recycled in the reactor to precipitate heavy metals. It has been found that: (1) by the recycling use of H2S, the continuous treatment system can remove heavy metals with less coagulant than in the batch, stirred vessel, (2) desorption of the dissolved sulfide ion by the mixed gas decreases the sulfide ion concentration in the treated water below 0.2 ppb, and (3) the conditions for the removal of heavy metals can be detected immediately by a sulfide ion electrode meter.
On the Mechanism of Formation of Furotropones from (4-Halogeno-2-butenyloxy)tropones
Authors: Takeshita Hitoshi , Tajiri Kozo , Kouno Isao 
Published: July 2006

Abstract
Pyrolysis of 2-[(E)-4-bromo-3-butenyloxy]tropone and 2-[(E)-4-bromo-2-methyl-2-butenyloxy]tropone produced 3-methyl-3-vinyl-2,3-dihydro-8H-cyclohepta[b]furan-8-one and 3-isopropylidene-2,3-dihydro-8H-cyclohepta [b]furan-8-one, which established the involvement of 3,3-sigmatropy for furotropone formation.
Effect of Inorganic Additives on the Reactions of Isomeric Transition-Activated 80Br and 82Br in the Gaseous HBr–CH4 System
Authors: Kondo Kenjiro , Yagi Masuo 
Published: July 2006

Abstract
The effects of various inorganic additives with and without dipole moments on the product yield distributions have been examined in the CH4–H80mBr and CH4-H82mBr systems. Indications were that the ion-clusters formed in the reactions of IT-activated 80Br and 82Br play an important role in determining individual product yield distributions.
Electrode Reactions of Several Transition Metal Ions in Aqueous Polyelectrolyte Solutions as Studied by DC and Fourier Transform Polarography
Authors: Imai Noboru , Hirota Michio , Umezawa Yoshio , Fujiwara Shizuo 
Published: July 2006

Abstract
The kinetic parameters, ks for several metal ions are decreased down to 1/10–1/50 in the presence of sodium polyacrylate, although the diffusion of metal ions in the same system differs little with and without sodium poly aclylate.
A Theoretical Consideration of the 13C NMR Chemical Shift of Protonated Systems. I. The Acetone–Sulfuric Acid System
Authors: Ando Isao , Kondo Masahiro , Nishioka Atsuo , Watanabe Shosuke 
Published: July 2006

Abstract
A quantum-chemical method has been developed using a point-charge model to calculate the 13C chemical shift for protonation in an acidic solution. This method has been applied to the acetone-sulfuric acid system; the gross tendencies between the observed and calculated results agree.
Calculations of the Rate Constants for the HX+NO\ightleftharpoonsHNO+X Reactions (X=H, F, Cl, Br, and I)
Authors: Higashihara Tetsuo 
Published: July 2006

Abstract
The rate constants for these hydrogen-transfer reactions:
HX+NO\ightleftharpoonsHNO+X(X=H,F,Cl,Br,and I)
have been calculated by means of the transition-state theory combined with the BEBO method over the temperature range of 250–4000 K. The calculated rate constants were then compared with the experimental kinetic data.
Synthesis and Characterization of (Salicylideneaminoalkyl)phosphonatocopper(II) and [(N-Salicylideneglycylamino)alkyl]phosphonatocopper(II)
Authors: Murase Ichiro , Martell Arthur E 
Published: July 2006

Abstract
The titled compounds have been synthesized by a template reaction of aminoalkylphosphonic acids or glycylaminoalkylphosphonic acids and salicylaldehyde with copper(II) ion. The square-planar structures have been proposed by analogy with corresponding structures of N-salicyclideneglycine or N-salicylideneglycylglycine chelates. The deprotonated peptide nitrogen coordination was confirmed by IR-spectra for the phosphonopeptides chelates.
The Solvent Extraction of Uni- and Bivalent Metal Picrates by Dibenzo-24-crown-8
Authors: Takeda Yasuyuki 
Published: July 2006

Abstract
The overall extraction equilibrium constants (Kex) for the 1:1:1 and 1:1:2 complexes of dibenzo-24-crown-8 (DB24C8) with several uni- and bivalent metal picrates between benzene and water have been determined at 25 °C. The Kex sequences of the uni- and bivalent metal ions with DB24C8 are Tl+&gt;Cs+&gt;Ag+&gt;Rb+&gt;K+&gt;Na+&gt;&gt;Li+ and Ba2+&gt;&gt;Pb2+&gt;&gt;Sr2+&gt;Ca2+, respectively. DB24C8 shows the highest selectivity for Ba2+ among all the alkali and alkaline earth metal ions, but no selectivity for the alkali metal ions. The extractability of DB24C8 for the alkali metal ions is not sensitive to the ratio of the ionic size to the cavity size of DB24G8. The plots of logKex values vs. reciprocal crystal ionic radii of the alkali and alkaline earth metals give straight lines, indicating that these straight lines are related to Born’s formula of solvation free energy.
An MO Study of Organic Sulfur Compounds. Comparison with the Corresponding Oxygen Compounds
Authors: Matsushita Toshio , Osamura Yoshihiro , Misawa Nobuaki , Nishimoto Kichisuke , Tsuno Yuuho 
Published: July 2006

Abstract
The contribution of 3d orbitals of sulfur atom to the electronic structures of the sulfur compounds, H2CS, CH3SH, C6H5SH, and C6H5SCH3 have been studied by means of ab initio MO method. The results have been compared with those of the corresponding oxygen compounds in order to clarify the peculiar properties of the sulfur compounds. The global molecular properties are scarcely affected by the 3d orbitals of sulfur atom since they are energetically highly located. However, the local characters such as charge distributions and LUMO are largely varied by the participation of 3d orbitals.
Kinetics of the Reduction Reaction of Tetranitromethane by Thiosulfate Ion in the Absence and Presence of Copper(II) Ion in Aqueous Mixtures of Methanol and Ethanol
Authors: Kimura Masaru , Shukutani Makiko 
Published: July 2006

Abstract
The kinetics of the reduction reaction of tetranitromethane by the thiosulfate ion in the absence and presence of the copper(II) ion have been investigated in aqueous solution and aqueous mixtures of methanol and ethanol. The mechanism of reaction has been thought to be the following:
C(NO2)4+S2O32−\xrightarrowk1C(NO2)3−+NO2+S2O3−
Cu(II)+S2O32\xrightarrowk2Cu(I)+S2O3−
C(NO2)4+Cu(I)\xrightarrowk3C(NO2)3−+NO2+Cu(II)
2S2O3−\xrightarrowrapidS4O62
The rate constants k1 and k2 have been determined under several conditions. The value of k1 was hardly affected by ionic strength, permittivity, and acetate ion concentration in the reaction solution, whereas k2 was markedly increased with decreasing ionic strength (μ), permittivity (D), and acetate ion concentration. For k2, plots of logk2 vs. μ1⁄2⁄(1+μ1⁄2 and logk2 vs. 1/D gave linear relationships. Under the specified conditions the k2-term in the reaction mechanism accounts for up to 90% of the reaction, the reaction being composed of a copper(II) catalyzed-chain reaction.
Adsorption Behavior of Phosphate Ion on the Iron(III) Complex of a Chelating Resin
Authors: Takeshita Ryoichi , Yoshida Isao , Ueno Keihei 
Published: July 2006

Abstract
Phosphate ion in 0.1 M (1 M=1 mol dm−3) sodium chloride solution was adsorbed selectively on the iron(III) complex of a chelating resin. Coordination unsaturated sites of the resin-bound iron(III) ion were considered to be the adsorption sites for phosphate ion, predominating species being dihydrogenphosphate ion (H2PO4−). Adsorption capacity of the resin increased with the increasing amount of iron(III) ion loaded on the chelating resin, while the molar ratio of the adsorbed phosphate ion to the resin-bound iron(III) ion became less than unity, indicating that only a fraction of the resin-bound iron(III) ion acts as the adsorption site at higher iron content. The steric and electrostatic interactions among the phosphate ions in the resin matrix may interfere with the stoichiometric adsorption of phosphate ion on the resin-bound iron at higher iron content.
The Determination of Berberine by Ion-pair Extraction-Titration, with Tetrabromophenolphthalein Ethyl Ester as the Indicator
Authors: Tsubouchi Masahiro 
Published: July 2006

Abstract
A method has been developed for the determination of berberine as a quinolizinium medicine. The method is based on the solvent extraction-titration of an ion pair. Sodium tetraphenylborate is used as the titrant, with tetrabromophenolphthalein ethyl ester as the indicator in the presence of chloroform. In the two-phase titration, the proposed procedure gives sharp end points as the organic phase changes from blue to yellow. The aqueous phase is colorless throughout the titration. From a p(berberine)-pH diagram, a theoretical titration curve is constructed. The titration curve at pH 6.5 is not too far from the ideal case.
Allylation of Nucleic Acid-Bases with Triallyl Phosphate
Authors: Tanabe Toshizumi , Yamauchi Kiyoshi , Kinoshita Masayoshi 
Published: July 2006

Abstract
Triallyl phosphate alkylated uracil (N-1), thymine (N-1), cytosine (N-1), adenine (N-3 and N-9), and guanine (presumably N-1 or N-7) in a water solution at 60 °C (pH values were 10–10.5 for uracil, thymine, cytosine, and adenine, and 12 for guanine), giving the corresponding allyl derivatives in considerable yields.
The Synthesis of 3′-Methoxy-2′,4,4′,6′- and 2′-Methoxy-3′,4,4′,6′-tetrahydroxychalcone and Some Quinochalcones and a Comparison of Them with Carthamin
Authors: Obara Heitaro , Onodera Jun-ichi , Abe Satoshi 
Published: July 2006

Abstract
3′-Methoxy-2′,4,4′,6′- and 2′-methoxy-3′,4,4′,6′-tetrahydroxychalcone, 2′,4,4′-trihydroxy-, 2′,4-dihydroxy-4′-methoxy-, and 2′-hydroxy-4,4′-dimethoxy-3′,6′-quinochalcone have been synthesized, and their properties have been compared with those of carthamin.
Synthesis of Coleon U 12-Methyl Ether
Authors: Matsumoto Takashi , Takeda Shoji 
Published: July 2006

Abstract
Reduction of 11-benzoyloxy-12-methoxyabieta-8,11,13-trien-7-one with sodium borohydride, followed by dehydration of the resulting alcohols with p-toluenesulfonic acid, afforded the corresponding 6,8,11,13-tetraene derivative. This was converted into 11-benzoyloxy-12-methoxyabieta-8,11,13-trien-6-one (8) via an epoxide. The 6-oxo compound (8) was reduced with lithium aluminium hydride. Subsequent oxidation of the resulting alcohol with m-chloroperbenzoic acid afforded 6β-hydroxy-12-methoxyabieta-8,12-diene-11,14-dione. This compound was further transformed into 11,14-diacetoxy-12-methoxyabieta-8,11,13-trien-6-one (13) by a series of reactions: Jones oxidation, reduction with a mixture of zinc powder and hydrochloric acid, and acetylation. The diacetate (13) was then oxidized with Jones reagent and the 6,7-dioxo product was immediately converted into 11-acetoxy-6,14-dihydroxy-12-methoxyabieta-5,8,11,13-tetraene (15) by repeated column chromatography on silica gel. The tetraene (15) was finally hydrolyzed with hydrobromic acid to give coleon U 12-methyl ether.
A Convenient Synthesis of α-(2-Benzothiazolylthio)alkanoates by Cleavage of β-Keto Esters with 2-Benzothiazolesulfenamides
Authors: Torii Sigeru , Tanaka Hideo , Okumoto Hiroshi 
Published: July 2006

Abstract
α-(2-Benzothiazolylthio)alkanoates were prepared by the reaction of β-keto esters with 2-(morpholinothio)benzothiazole in refluxing alcohols. Sulfenylating cleavage of α-methoxycarbonylcycloalkanones afforded the corresponding ω-alkoxycarbonyl- and/or ω-carbamoyl-α-(2-benzothiazolylthio)alkanoates.
Zeeman Absorption Spectra of 2,3-Dichloro-9,10-anthraquinone Crystals
Authors: Sano Mizuka , Narisawa Takatoshi , Izawa Kohji , I’Haya Yasumasa J 
Published: July 2006

Abstract
Polarized T←S0 absorption spectra were measured for 2,3-dichloro-9,10-anthraquinone melt-grown single crystals in a magnetic field of 50 kOe. From the analysis of the Zeeman absorption patterns, the lowest triplet state of 2,3-dichloro-9,10-anthraquinone in the crystalline state has been assigned to 3A1(ππ*). The c-polarized first absorption peak at 21734.7 cm−1 has been interpreted as gaining intensity mainly from an x-polarized transition from the ground state to a B1(nπ*) perturbing singlet state, which is directly spin-orbit-coupled with the y spin-sublevel of the 3A1 state. The a- and b-polarized first peaks, at 21733.9 and 21733.6 cm−1, respectively, have been interpreted as gaining intensity through the configurational mixing of the 3A1(ππ*) state with a nearby 3B1(nπ*) state.
An ESR Study of the Photolysis of N-Nitrosodialkylamines
Authors: Elliot A John , Wan Jeffrey K S 
Published: July 2006

Abstract
The nitroxide radicals which are formed when acidic, neutral, and alkaline solutions containing N-nitrosodialkylamines are photolysed, have been characterized by electron spin resonance spectroscopy. Nitrosamines are found to be photolytically active only in acidic solutions. In neutral and alkaline solutions nitrosamines only participate in secondary reactions involving the alcohol derived radicals. Some possible reaction pathways have been postulated.
Flat-band Potential of p-Type GaP in Acetonitrile Solutions
Authors: Satoh Kiyoshi , Yoneyama Hiroshi , Tamura Hideo 
Published: July 2006

Abstract
An interaction of quinone compounds such as tetrachloro-p-benzoquinone and p-benzoquinone with surface hydroxyl groups of a p-type GaP electrode seems to play an important role in determining the magnitude of photovoltage in acetonitrile solutions. The same holds for p-type InP and Si.
Infrared Emission Spectra of CO2 in the Explosion Reaction of CO and O2 Using a Rapid-Scan Spectrometer
Authors: Tanaka Masako , Nagasaka Shigeo , Sawamura Sadao , Katayama Meiseki 
Published: July 2006

Abstract
The infrared emission spectra of CO2 were observed by means of a rapid-scan infrared spectrometer during the explosion of CO-O2 in a cylindrical vessel. The R-branch band heads of 001-000 and 011-010 were detected. The time dependences of the emission intensities of these band heads, ν1+ν3, and 2ν2+ν3, were studied.
Dissociation Constants of Several Protonated Amines in Propylene Carbonate
Authors: Izutsu Kosuke , Nakamura Toshio , Iijima Izumi 
Published: July 2006

Abstract
The dissociation constants pK(BH+) of five protonated monoamines in propylene carbonate have been determined potentiometrically using a glass electrode which was calibrated in a picric acid-picrate buffer solution. The pK(BH+) values found at 25 °C were 10.1 for aniline, 11.9 for pyridine, 15.9 for ammonia, 17.0 for 1,3-diphenylguanidine, and 17.9 for triethylamine.
Thermochromism of Metal Chelates with Triphenylmethane Complexons in Aqueous Solutions. II. Inhibitive Effects of the Protolysis of Aqua Cu2+ Ion on the Thermochromism of Cu(II)–Xylenol Orange Chelate
Authors: Nakada Shoji , Yamada Mutsuo , Ito Tasuku , Fujimoto Masatoshi 
Published: July 2006

Abstract
Temperature-dependent protolytic equilibrium, Cu(OH2)n2+ \oversetk1\undersetk−1\ightleftharpoons Cu(OH)(OH2)n−1++H+, was found to inhibit thermochromic changes of Cu(II)-Xylenol Orange (XO) chelate in unbuffered weakly acid aqueous solutions. The rate constants, k1 and k−1 at 25 °C and I=0.1 mol dm−3 were evaluated to be 103–104 s−1 and ca. 2×109 mol−1 dm3 s−1, respectively.
The Asymmetric Hydroformylation of Vinyl Acetate
Authors: Watanabe Yoshihisa , Mitsudo Take-aki , Yasunori Yukio , Kikuchi Junichi , Takegami Yoshinobu 
Published: July 2006

Abstract
Vinyl acetate gives selectively (S)-2-acetoxypropanal in 10–24% optical yields by the asymmetric hydroformylation with μ,μ′-dichlorotetracarbonyldirhodium–(−)-DIOP. (R)-Benzylmethylphenylphosphine and neomenthyldiphenylphosphine give low optical yields. The reaction depends essentially on the DIOP/rhodium ratio. Just 2 mol or more of (−)-DIOP per g-atm of rhodium is required for the asymmetric reaction. Other reaction variables (temperatures and pressures of hydrogen and carbon monoxide) have minor effects.
Phase Transfer Catalyzed Reaction of Organic Thiocyanates with Hydroxide Ion
Authors: Yano Yumihiko , Kurashima Akira , Tagaki Waichiro 
Published: July 2006

Abstract
The reactions of 9-fluorenyl, phenacyl, benzhydryl, and benzyl thiocyanates (or the corresponding bromides with sodium thiocyanate) with hydroxide ion under phase transfer conditions afforded 9,9′-bifluorenylidene, 2,3-dibenzoylthiirane, thiobenzophenone and dibenzyl disulfide, respectively.
Neutron Diffraction Study of Aqueous Ionic Solutions. I. Aqueous Solutions of Lithium Chloride and Caesium Chloride
Authors: Ohtomo Norio , Arakawa Kiyoshi 
Published: July 2006

Abstract
The structure factors Sm(Q) for aqueous solutions of LiCl and CsCl at room temperature, including those for heavy water, have been determined by means of the time-of-flight (TOF) neutron diffraction method using an electron linear accelerator (LINAC). Analysis of the diffraction data has been carried out for the aqueous ionic solutions as well as for pure heavy water. The following results were obtained with respect to the structure of the nearest hydration shell: (a) the coordination numbers are 4 for Li+ and 6 for Cl− in the LiCl solution, and 8 for Cs+ and 6 for Cl− in the CsCl solution, (b) the average ion-oxygen distances are 1.90±0.05 Å for Li+, 2.95±0.10 Å for Cs+ and 3.10±0.05 Å for Cl−, and (c) around cations water molecules take the configuration to orient the axis of one of two lone-pair hybrids on a straight line joining an oxygen atom and a cation.
Charge-transfer Absorption Intensity and Magnetic Property of Solid Ion Radical Salts
Authors: Iida Yôichi 
Published: July 2006

Abstract
The electronic spectrum of solid ion radical salt is known to be different from the monomer spectrum of the radical ion and to show an intermolecular charge-transfer transition between ion radicals in the low-energy region. The intensity of the charge-transfer absorption was theoretically obtained by applying one-dimensional half-occupied Hubbard model to the segregated stack of ion radicals of solid ion radical salts. The intensity of the charge-transfer absorption was then correlated to the magnetic properties of those solid ion radical salts.
The Electronic Spectra of Anthraquinone in Shpol’skii Matrices and in Crystals at 4.2 K
Authors: Kanezaki Eiji , Nishi Nobuyuki , Kinoshita Minoru 
Published: July 2006

Abstract
The lower excited singlet and triplet states of 9,10-anthraquinone-d0 and -d8 are examined in normal alkanes and in crystals at 4.2 K with the phosphorescence excitation method. The S←S0 and T←S0 excitation spectra are analyzed by considering environmental effects on and isotopic changes in the vibrational structure. The low energy region of the spectra can be explained without taking the Au origin in close proximity of the B1g origin into account. The latter origin band in the singlet and triplet spectra in hexane and in crystals, respectively, is weaker by a factor of 10−3–10−2 than the strongest vibronic band in the respective regions. No clear evidence has been found about the location of the singlet and triplet Au states in the excitation spectra.