bluuebunny/crossref_metadata_2025_split huggingface dataset:
Convenient Synthesis of 3-Acyl- and 3-Alkyl-1,2-naphthoquinones
Authors: Takuwa Akio , Kai Ryoji 
Published: July 2006

Abstract
3-Acyl-1,2-naphthalenediols prepared by the photoinduced addition reaction of 1,2-naphthoquinone with alkanals were oxidized with Fremy’s salt to give 3-acyl-1,2-naphthoquinones in good yields. The diols were reduced with amalgamated zinc, followed by oxidation to afford 3-alkyl-1,2-naphthoquinones in moderate yields.
Stereochemistry in the Conversion of Phenyldiazomethane into Stilbenes and Spirooxetanes Caused by Tetrahalogenated 1,4-Benzoquinones. Effects of Halogen Substituents
Authors: Oshima Takumi , Nagai Toshikazu 
Published: July 2006

Abstract
Reaction of phenyldiazomethane (1) with tetrafluoro-1,4-benzoquinone (2a) gave isomeric mixtures of stilbenes (3, cis/trans=4.7) and spirooxetanes (4a, cis/trans=1.1) via zwitterion intermediates. Similarly, tetrabromo-1,4-benzoquinone (2c) provided 3 and spirooxetane (4c); however, the cis/trans ratio of 3 dropped to 2.3 and 4c was solely the trans isomer. On the other hand, reaction with tetraiodo-1,4-benzoquinone (2d) afforded no spirooxetane and gave a further reduced isomer ratio of 3 of 1.9.
A Facile, Practical Synthesis of 2-(6-Methoxy-2-naphthyl)propenoic Acid
Authors: Hiyama Tamejiro , Wakasa Noriko , Ueda Tomoko , Kusumoto Tetsuo 
Published: July 2006

Abstract
A facile and practical method for the synthesis of 2-(6-methoxy-2-naphthyl)propenoic acid, a precursor of anti-inflammatory agent naproxen, is described. The method involves (1) Pd-catalyzed ethynylation of 2-bromo-6-methoxynaphthalene, (2) regioselective addition of HX to the triple bond, and (3) Pd-catalyzed carbonylation of the resulting vinyl halide followed by (4) alkaline hydrolysis.
Analysis of Solvent Effects on the Rate of the Cope Rearrangement: Evidence for Its Hydrogen-Bond-Insusceptible Nature
Authors: Mitsuhashi Tsutomu , Yamamoto Gaku 
Published: July 2006

Abstract
The kinetic study was made by 1H NMR for the Cope rearrangement of 4,4-dicyano-5-ethyl-1,5-heptadiene in a variety of solvents at 90°C, which revealed that the reaction is affected by solvent polarity to some extent but is insusceptible to hydrogen bonding with protic solvents, in agreement with our prediction as to solvation of the dipolar transition state for [3,3]sigmatropic reactions.
Heat Capacities and Phase Transitions of Crystalline 1,3,5-Trichloro-2,4,6-trimethylbenzene
Authors: Fujiwara Takahiro , Atake Tooru , Chihara Hideaki 
Published: July 2006

Abstract
Heat capacities were measured of 1,3,5-trichloro-2,4,6-trimethylbenzene by adiabatic calorimetry from 3 to 327 K covering the three stable solid phases, II, III, and IV. The phase transitions, III–II and IV–III, are of first order and accompanied by a hysteresis effect. The IV–III transition occurs at 163.5 K when the crystal cooled slowly from Phase II, whereas the heat capacity anomaly splits into two at 158.7 and 163.5 K if the crystal was cooled rapidly. From the time dependence of Raman spectra at low frequencies, kinetics of transition II–III was studied; it is best explained by diffusionless nucleation mechanism. The thermal hysteresis can be rationalized by assuming the existence of a metastable phase IV′.
Crystal Growth of Transition Metal Fluorides
Authors: Ohtori Norikazu , Yoshikawa Yuzo , Sasaki Ken-ichi , Moriwaki Hisaki , Yokoyama Haruhiko 
Published: July 2006

Abstract
Kinetics of crystal growth of transition-metal fluorides, MF2(M=ZnII and PbII) has been studied by the use of both constant composition and conventional methods. The effective orders in an empirical reaction-rate function of supersaturation were 1.71 (2.0) for ZnF2·4H2O and 0.88 (1.2) for PbF2 (The values in the parentheses are from the conventional method). These findings suggest that the crystals of zinc fluoride grow by a spiral growth (surface reaction) mechanism and lead fluoride by a bulk diffusion controlled mechanism.
X-Ray Crystal Structures of Nickel Complexes with 2-Methyl-8-quinolinol, Ni(mq)2(H2O)2 and Na3Ni3H6(mq)15·H2O
Authors: Yuchi Akio , Shiro Motoo , Murakami Hiroshi , Wada Hiroko , Nakagawa Genkichi 
Published: July 2006

Abstract
Two Ni(II) complexes with 2-methyl-8-quinolinol (Hmq) were prepared and their structures determined by single-crystal X-ray diffraction techniques. In Ni(mq)2(H2O)2, which is orthorhombic, space group Pccn, Z=8 the geometry is trans(O,O), cis(N,N), and cis(H2O,H2O), and the octahedron is appreciably distorted. In Na3Ni3H6(mq)15·H2O, which is monoclinic, space group P21⁄c, Z=4, three binuclear units Ni(1)–Na(1), Ni(2)–Na(2), and Ni(3)–Na(3), are involved. All the Ni atoms are surrounded by three ligands in a mer configuration. The Na(1) and Na(2) atoms are five-coordinated with two ligands and an O atom bridging Na and Ni atoms within a dimer. The Na(3) atom has, together with the ligands, a coordinated water which is hydrogen-bonded to the O atom coordinating to the Ni(3) atom. These dimeric units are infinitely linked by intermolecular hydrogen bonds. Compared to the corresponding complexes of 8-quinolinol derivatives without 2-methyl substituent, the Ni–N is elongated by 0.06–0.12 Å, whereas the Ni–O is shortened by 0.01–0.05 Å. An increase in the bond angle (7–11 deg) between a N atom of a ligand and the donor atom (Y) which occupies the trans position to the O atom of the same ligand, reduces the steric interaction between the methyl group and Y in Hmq complexes. Shorter contacts between ligands in Hmq complexes than those in Hq complexes lead to their lower stabilities and, thus, the lower extractabilities.
Substituent Effects on 15N and 17O NMR Chemical Shifts in 4′-Substituted trans-NNO-Azoxybenzenes
Authors: Sawada Masami , Takai Yoshio , Tanaka Takanori , Hanafusa Terukiyo , Okubo Masao , Tsuno Yuho 
Published: July 2006

Abstract
15N and 17O NMR spectra have been measured for a series of 4′-substituted trans-NNO-azoxybenzenes (AZOXY) and the obtained substituent chemical shift (SCS) values have been analyzed by means of the LSFE equation. Both the resonance and the polar contribution of substituents are important in determining the 15N(β) SCS and the adjacent terminal 17O SCS in the –Nα=Nβ(O)– function of the AZOXY set. The resonance contributions of the AZOXY sets differ from those of the corresponding PYNO sets in view of a depressed pi-acceptor resonance contribution. That is, the resonance susceptibility ratio in the LSFE equation, ρπ+⁄ρπ−, varies from 1.4 (PYNO) to 2–4 (AZOXY) for both 15N and 17O SCS. The results are compared with the 13C SCS of the corresponding positions in the relevant aromatic side-chain systems, and characterized in terms of repulsive pi-acceptor interaction between the substituents and the side-chain pi-electron systems. The importance of such dual resonance susceptibility has been shown for understanding characteristic features of the 15N and the adjacent 17O SCS.
Asymmetric Trasformation of Symmetrical Epoxides to Allylic Alcohols by Lithium (S)-2-(N,N-Disubstituted aminomethyl)pyrrolidide
Authors: Asami Masatoshi 
Published: July 2006

Abstract
Enantioselective deprotonation of symmetrical epoxides was studied by using chiral lithium amide, prepared from (S)-2-(N,N-disubstituted aminomethyl)pyrrolidine and butyllithium. Chiral allylic alcohols were obtained with moderate to high enantiomeric excesses (ee’s) (41–92% ee) from several cyclic and acyclic epoxides employing lithium (S)-2-(1-pyrrolidinylmethyl)pyrrolidide in tetrahydrofuran (THF) in the presence of 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU).
The IR Photochemistry of Organic Compounds. IV. The Infrared Multiple-Photon Decomposition of Cyclic Ethers Induced by a TEA CO2 Laser
Authors: Majima Tetsuro , Ishii Tadahiro , Arai Shigeyoshi 
Published: July 2006

Abstract
The mechanism of the infrared multiple-photon decomposition (IRMPD) of saturated cyclic ethers (1–7) has been systematically studied on the basis of product analysis, particularly with the aim of finding a suitable cyclic ether for oxygen-isotope separation. The main products are H2CO, CO, H2, and lower hydrocarbons. Acetaldehyde is additionally formed in the IRMPD of 1 and 3–6, while acetone is produced only in the IRMPD of 3b. The initial process is the homolytic cleavage of the C–O bond to yield the corresponding biradical with a high internal energy. The biradical decomposes sequentially of through secondary IRMPD to yield the primary products with high internal energies. The decomposition of the biradicals proceeds mainly via β-fission, but also partly via γ-fission. Some of the primary products further decompose sequentially or through secondary IRMPD into stable products. Several radical intermediates are trapped with Br2. The product distributions are clearly dependent on the irradiation parameters. This dependence and the branching ratio are discussed in terms of sequential decomposition, the collisional effect, and the internal energy of the transient species. On the basis of the experimental results, it is suggested that, among cyclic ethers, the best starting ether in the oxygen-isotope separation by a TEA CO2 laser is tetrahydropyran (4).
Studies on the Formation of Magnetite Colloidal Dispersions in the Presence of Poly(vinyl alcohol)
Authors: Yokoi Hiroshi , Yagishita Kazuhiro , Nakanishi Yoichiro 
Published: July 2006

Abstract
The formation of magnetite in aqueous solutions containing Fe3+ and Fe2+ ions in 2:1–1:2 ratio and poly(vinyl alcohol) at room temperature has been studied by magnetic susceptibility and optical absorption measurements. It has been found that the yield reaches a maximum after allowing the solutions at pH 10.5 to stand in a sealed state for 24 h. Transmission electron micrographs for their cast films have revealed that colloidal particles with diameters of 40–100 Å form either chain-like or cluster-like agglomerates. The particles have been identified as magnetite crystals by electron diffraction analysis and by direct observation of the crystal lattice structures.
The Independence of the Counter-Ion Density and the Electric Field from Polyelectrolyte Model Configurations on the Model Surfaces
Authors: Kaneko Tetsuo 
Published: July 2006

Abstract
The polyelectrolyte models of two different configurations are used in order to show that the counter-ion density and the electric field on the surface of a polyelectrolyte model can not be strongly sensitive to the configuration of the model. These models are a layer and a cylinder in which charged groups are packed. Counter-ion densities and electric fields, which appear in water on the surfaces of the layer and the cylinder because of ionic dissociation, are estimated on the basis of the Poisson–Boltzmann equation. Their estimations show that both the counter-ion density and the electric field on the surface of the cylinder are approximately equal to those on the surface of the layer.
Time-Resolved Dissociation of Ionized Propanoic Acid
Authors: Arakawa Ryuichi 
Published: July 2006

Abstract
The appearance energies of C3H5O2+, C3H5O+, C3H4O+, C3H3O+, CHO2+, and C2H5+ from propanoic acid were obtained. The kinetic shifts were observed for the formation of C3H5O2+, C3H5O+, and C3H4O+. The dissociation of ionized propanoic acid is metastable for the loss of a hydrogen atom and water. The results of the metastable-ion-intensity ratios, collisional activation mass spectra and kinetic-energy releases indicate that the propanoic acid ion isomerizes to a more stable enol tautomer prior to dissociation.
X-Ray Structural Studies of Green and Brown Crystals of trans-[CoCl2(N48)]X (N48=1,4,7,10-Tetraazacyclopentadecane, X=NO3−, BF4−, and ClO4−)
Authors: Tsuchimoto Masanobu , Takazawa Hiroyuki , Kita Masakazu , Nonoyama Matsuo , Ohba Shigeru , Saito Yoshihiko , Fujita Junnosuke 
Published: July 2006

Abstract
Crystal structures of green (X=NO3−(1), BF4−(2)) and brown (X=BF4−(3) and ClO4−(4)) salts of trans-[CoCl2(N48)]X (N48=1,4,7,10-tetraazacyclopentadecane) were determined by an X-ray diffraction method. The complex cation is a RSSR(SRRS) isomer for the four chiral nitrogen atoms and has approximate C2 symmetry. Green crystals 1 and 2 are monoclinic and have the chiral space group P21, comprising one antipode of the complex ion by spontaneous resolution, whereas brown crystals 3 and 4 are orthorhombic and a racemate. The eight-membered chelate ring formed by the N48 ligand and the Co atom takes a distorted boat–boat (BB) form in 1 and 2, whereas the conformation is disordered in 3 and 4 with BB (40%) and distorted twist–boat-chair (TBC; 60%) forms at room temperature. At 113 K, the eight-membered chelate ring in 4 takes exclusively the TBC form. The crystal data are as follows: [CoCl2(C11H26N4)]X, monoclinic NO3 salt, 1, P21, a=9.672(3), b=12.285(5), c=7.051(2) Å, β=94.70(3)°, V=835.0(5) Å3, Z=2, T=300(1) K, final R=0.037 for 2381 reflections. Monoclinic BF4 salt, 2, 2, P21, a=9.857(2), b=12.694(2), c=7.065(1) Å, β=94.34(2)°, V=881.5(2) Å3, Z=2, T=300(1) K, final R=0.031 for 1880 reflections. Orthorhombic BF4 salt, 3, Pcab, a=12.816(1), b=22.359(2), c=12.388(1) Å, V=3549.8(5) Å3, Z=8, T=300(1) K, final R=0.095 for 2086 reflections. Orthorhombic ClO4 salt at 300(1) K, 4a, Pcab, a=12.829(1), b=22.376(2), c=12.425(1) Å, V=3566.7(6) Å3, Z=8, final R=0.070 for 1764 reflections; orthorhombic ClO4 salt at 113(2) K, 4b, a=12.630(2), b=22.276(5), c=12.354(2) Å, V=3475.7(11) Å3, final R=0.109 for 2215 reflections.
Preparation and Some Properties of [CoIIorIII{RhIII(aet or l-cys-N,S)3}2]-Type S-Bridged Trinuclear Complexes
Authors: Konno Takumi , Aizawa Sen-ichi , Okamoto Ken-ichi , Hidaka Jinsai 
Published: July 2006

Abstract
The reactions of fac-[Rh(aet)3] (aet=2-aminoethanethiolate) or ΔLLL-fac-[Rh(l-cys-N,S)3]3− (l-cys=l-cysteinate) with [CoCl(NH3)5]2+ produced [CoIII{RhIII(aet or l-cys-N,S)3}2]3+or3−, while the reactions with Co2+ formed [CoII{RhIII(aet or l-cys-N,S)3}2]2+or4− which were oxidized to give [CoIII{RhIII (aet or l-cys-N,S)3}2]3+or3−. These complexes were optically resolved or separated by fractional crystallization or column chromatography, and characterized from their absorption, CD and 13C NMR spectra. The reactions of fac-ΔLLL-[Rh(l-cys-N,S)3]3− with [CoCl(NH3)5]2+ or Co2+ at room temperature proceeded with retention of the starting ΔLLL configuration to give the ΔLLLΔLLL isomer, while the reaction with Co2+ at high temperature (ca. 95 °C) was accompanied by inversion to form the ΔLLLΛLLL, ΛLLLΛLLL, and ΔLLLΔLLL isomers. Cyclic voltammetric measurements of [CoIII {RhIII(aet or l-cys-N,S)3}2]3+or3− in water showed a quasi-reversible redox couple corresponding to the central Co(III)/(II) at ca. −0.3 V vs. Ag/AgCl. Their absorption and CD spectra and cyclic voltammograms are discussed in comparison with those of the corresponding [CoIII{CoIII (aet or l-cys-N,S)3}2]3+or3−.
A Facile Preparation of O-Alkyl Selenocarboxylates and Selenoamides via Se-Alkynyl Selenocarboxylates
Authors: Ishihara Hideharu , Yoshimi Michinari , Hara Nobuhiko , Ando Hiroyuki , Kato Shinzi 
Published: July 2006

Abstract
Se-Alkynyl selenocarboxylates (1) were found to readily react with alcohols and amines to give O-alkyl selenocarboxylates (4) and selenoamides (6) in moderate to good yields, respectively. The formation mechanisms of 4 and 6 via selenoketene and ammonium alkyneselenolate, respectively, are proposed.
Substituent Effects. 22. The Solvolysis of α-t-Butylbenzyl Tosylates
Authors: Tsuji Yutaka , Fujio Mizue , Tsuno Yuho 
Published: July 2006

Abstract
The rates of solvolysis of α-t-butylbenzyl tosylates were determined in 80% aqueous acetone (80A) and 80% aqueous ethanol (80E) for an extended series of substituents. The substituent effect can be linearly correlated in terms of the Yukawa–Tsuno LArSR relationship, with a ρ value of −5.542 and an r value of 1.093 in 80A, and −5.650 and 1.106 in 80E, respectively. The large negative ρ and exalted r values suggest the operation of the kc mechanism in this solvolysis without nucleophilic solvent assistance and methyl participation. From a comparison of the substituent effects, the exalted r value of 1.15 observed in the solvolysis of α-methylbenzyl chlorides can be attributed to the enhanced resonance demand characteristic of secondary benzylic system rather than to a correlational artifact arising from nonlinearity due to SN1–SN2 mechanistic change. The solvolysis of this system can be utilized as an appropriate reference system for the accurate estimation of σ+ constants in various solvents.
Selective and Active Transport of In3+ through N-Nitroso-N-p-octadecylphenylhydroxylamine Ammonium Salt Impregnated Membrane
Authors: Okushita Hiroshi , Shimidzu Takeo 
Published: July 2006

Abstract
Selective and active transport of In3+ was studied through a polypropylene membrane impregnated with N-nitroso-N-p-octadecylphenylhydroxylamine ammonium salt (3). In3+ is selectively concentrated from In3+–Zn2+, In3+–Al3+ and In3+–Zn2+–Al3+ mixtures by an antiport mechanism as a counter flow of H+, respectively. The selective transport of In3+ was found to be attributed to the chelating affinity between 3 and In3+. As a model experiment of the practical use, the separation of In3+ from the solution of containing 10–100 folds of Zn2+ was investigated. The present membrane selectively separates In3+, the separation factor is 200–250. It is suggested that the present membrane system is useful for separation of indium from the ore containing indium such as the zincblende.
Oxidation of Cycloalkanols to the Corresponding Cycloalkanones with Chlorine in the Presence of Nitroxide Radical as a Mediator
Authors: Yamaguchi Masao , Takata Toshikazu , Endo Takeshi 
Published: July 2006

Abstract
A method for the oxidation of cyclic alcohols to the corresponding cyclic ketones with 2,2,6,6-tetramethyl-1-piperidinyloxyl (a mediator) and chlorine is described. This oxidation involves an oxoaminium salt, formed from the nitroxide radical and chlorine, which oxidizes cyclic alcohols to give the corresponding ketones in good yields.
51V NMR Chemical Shift and Anisotropy in Solid Metavanadates
Authors: Hayashi Shigenobu , Hayamizu Kikuko 
Published: July 2006

Abstract
51V NMR spectra of alkali and ammonium metavanadates have been measured with and without magic angle spinning (MAS) of the sample at a high static magnetic field (9.40T). The isotropic chemical shifts have been determined accurately from the MAS spectra, while the principal values of the shift tensor have been estimated from the static spectra. Correlations between the NMR parameters and structural factors have been briefly discussed.
Statistical Thermodynamic Study of Polar Organic Liquids
Authors: Kawai Satoshi , Arakawa Kiyoshi 
Published: July 2006

Abstract
A statistical thermodynamic study of polar organic liquids has been worked out on the basis of the liquid model as an assembly of particles immersed in a uniform background potential, which was proposed in the preceding paper (Bull. Chem. Soc. Jpn., 63, 307 (1990). The liquid model is regarded as a kind of mean field approximation. Calculations of thermodynamic functions of eight polar liquids (acetone, 2-butanone, dimethyl sulfoxide, chlorobenzene, bromobenzene, benzonitrile, nitrobenzene, and aniline) have been performed. The results show that the theory is effectively applicable to four polar liquids (acetone, 2-butanone, dimethyl sulfoxide, and nitrobenzene) as well as to nonpolar ones. However, for other four liquids (chlorobenzene, bromobenzene, benzonitrile, and aniline) some deviations of calculated values from experimental data have been found, which are supposed to occur from some restriction of free rotation of molecules in these liquids. Detailed considerations have been given on this subject.
Electrostatic and Hydrophobic Interactions in the Ion Associations between Tripositive Complex Ions and Sulfonate Anions
Authors: Iida Masayasu , Iwaki Masayo , Matsuno Yumi , Yokoyama Haruhiko 
Published: July 2006

Abstract
The ion associations of [Co(NH3)6]3+, [Cr(en)3]3+(en=ethylenediamine), lel3-[Cr(R-chxn)3]3+ lel3=lel,lel,lel-, and chxn=trans-1,2-cyclohexanediamine), [Co(bpy)3]3+ (bpy=2,2′-bipyridine), [Co(phen)3]3+(phen=1,10-phenanthroline), and [Cr(phen)3]3+ with Cl−, SO42−, CH3SO3−, C6H5SO3−, (CH2SO3)22−, and m-C6H4(SO3)22− were investigated at 25°C by means of conductivity measurements of aqueous mixed electrolyte solutions with a stoichiometrically constant ionic strength of 0.01 mol dm−3. The ion-association constants thus obtained were compared with each other and also with those estimated by the use of electrostatic theories of ion association. Some specific interactions besides such usual electrostatic ones were found to play important roles in the ion associations of SO42− with [Co(NH3)6]3+ and [Cr(en)3]3+, in those of C6H5SO3− and m-C6H4(SO3)22− with [Co(phen)3]3+, [Cr(phen)3]3+, and [Co(bpy)3]3+, and in those of SO42−, C6H5SO3−, and m-C6H4(SO3)22− with lel3-[Cr(R-chxn)3]3+. The specific interactions existing in the first group were presumed to be short-range electrostatic ones, such as hydrogen-bonding, and in the second group, the so-called hydrophobic ones. The complex ion, lel3-[Cr(R-chxn)3]3+, seemed to have both interactions, depending on the counter anions.
Belousov–Zhabotinskii Reaction with 2,3-Diones
Authors: Tsukada Masao , Inamoto Naoki 
Published: July 2006

Abstract
2,3-Butanedione and 2,3-pentanedione have been found to generate chemical oscillations in 2,3-dione/BrO3−/Ce4+/H2SO4 system. The concentration range within which the oscillatory behavior can be observed for each reactant is reported.
Mixture Dependences of OH(2Σ) Produced in the Oxidations of C2H2 and C2H6 in Shock Waves
Authors: Koike Tohru 
Published: July 2006

Abstract
The OH(2Σ) emissions from shock-heated mixtures of C2H2/O2, C2H2/C2H6/O2, and C2H6/O2 diluted in Ar were observed and the mixture dependences of the emissions were obtained. OH(2Σ) production, depending on the test gas mixture, could be in accordance with the view-point that the two oxidations of C2H2 and C2H6 progress by influencing each other.
Mass Spectral Study of Ionized-Hydroxyacetone Dissociation
Authors: Arakawa Ryuichi 
Published: July 2006

Abstract
The ionization and appearance energies of hydroxyacetone (CH3COCH2OH) were obtained. The metastable dissociation of ionized hydroxyacetone involves the loss of a hydrogen atom and CHO. The results of the metastable-ion intensity and collisional activation indicate that the hydroxyacetone ion does not isomerize to the enol tautomers prior to dissociation.
Hexaammineruthenium Complex as Two-Electron Catalyst for Oxygen Evolution by Homogeneous and Heterogeneous Water Oxidation
Authors: Ramaraj Ramasamy , Kaneko Masao , Kira Akira 
Published: July 2006

Abstract
The [Ru(NH3)6]3+ complex is shown to be a two-electron catalyst for homogeneous as well as heterogeneous water oxidation to evolve dioxygen. The oxygen evolution is proposed to proceed by two molecules of the complex through a peroxo-bridged intermediate involving higher oxidation state [Ruv(NH3)6]5+.
Photoinduced Alkylation Reaction of Benzo[f]indole-4,9-dione with Arylalkenes
Authors: Nakagawa Katsuhiko 
Published: July 2006

Abstract
Photoreaction of 1-alkyl-2-methyl-1H-benz[f]indole-4,9-diones (indolequinones) with arylalkenes in benzene gave 3-alkylated products. Irradiation of 1-allyl substituted indolequinone in benzene gave 1,3-hydrogen shift product in the presence or absence of arylalkenes. The fluorescence of 1,2-dimethyl-1H-benz[f]indole-4,9-dione exhibits a large bathochromic shift in polar solvents, indicating polar charge-transfer character for its S1-state.
The Effects of Aromatic Compounds on the Hydrogen-Transfer Reaction to Coal Model Compounds
Authors: Chiba Koji , Tagaya Hideyuki , Suzuki Toru , Sato Shimio 
Published: July 2006

Abstract
A hydrogen-transfer reaction from a hydrogen molecule to benzophenone in 1-methylnaphthalene without a donor was accelerated in the presence of anthracene. Phenanthrene and pyrene were detrimental to the reaction. Dibenzyl ether conversion was also accelerated by the addition of anthracene, pyrene, and fluorene. Conversions of coal model compounds in 1-methylnaphthalene under a hydrogen atmosphere correlated well with conversions in tetralin under a nitrogen atmosphere.