bluuebunny/crossref_metadata_2025 huggingface dataset:
Physicochemical Properties of Eicosane-1,20-bis(trimethylammonium) Dibromide in Aqueous Solution
Authors: Yasuda Masaaki , Ikeda Kenji , Esumi Kunio , Meguro Kenjiro
Published: July 2006

The physicochemical properties of a cationic α,ω-type(bolaform) surfactant, eicosane-1,20-bis(trimethylammonium) dibromide (C20Me6), were investigated by means of surface tension, electrical conductivity, density, dye solubilization, fluorescence, and light scattering. The results obtained for C20Me6 were compared with those for decyltrimethylammonium bromide (C10Me3). The surface tension measurement suggests that C20Me6 has a folded, “wicket-like” conformation at the air–water interface. The cmc of C20Me6 was smaller than that of C10Me3. The apparent ionization degree of C20Me6 was larger, and the polarity of the micellar Stern layer was higher than that of C10Me3. It was found that the C20Me6 micelle has an aggregation number of about 19, a hydrodynamic radius of 16 Å, and a partial molar volume of 480.49×10−3 dm3 mol−1, suggesting that the micelle is nearly spherical; thus, the main alkyl chain is almost stretched, and the outermost region of the micelle is loose.
Potential Distribution in a Fluidized Bed Electrode
Authors: Eskikaya Tülay
Published: July 2006

A study is described on the measurements of potential distribution in the bed and electrolyte of a hydrogen peroxide depolarized fluidized bed electrode consisting of 10 grams of silver coated glass beads in a cell of cyclindrical geometry. The results of potential profiles show that the electrode potentials both in static and fluidized beds were uniform throughout most of the bed. In the latter case, however, the degree of deactivation in the top of the bed is less than for a static bed, which explains current from fluidized bed. The variation of the charge-transfer coefficient along the bed, which is of great importance from the point of the performance of a fluidized bed electrode, is also determined.
Theoretical Studies on the Disproportionation of Carbon Monoxide on Nickel Clusters
Authors: Srivastava Arun K , Kojima Isao , Miyazaki Eizo
Published: July 2006

In the framework of CNDO (Complete neglect of differential overlap method, VOIP (Valence orbital ionization potential) has been evaluated using the method of Anno and Sakai and for exchange integrals Wolfsberg–Helmholtz approximation has been used. With these the problem of parametrization with reference to transition metals becomes rather less troublesome. In its present form the method has been used for studying the disproportionation of carbon monoxide on a nickel cluster having five atoms. A large number of theoretical models were devised, which are based upon various mechanistic possibilities; for each of these, bond energies between different atoms were calculated and plotted against the distance, with an aim of studying the formation and desorption of CO2. The present studies suggest that this reaction may follow a dissociative path, where in the first step one molecule of CO dissociates, leaving adsorbed carbon and oxygen on the Ni surface, followed by subsequent reaction of this adsorbed oxygen with another molecule of CO from the gas phase or it may follow disproportionation.
Synthesis and Characterization of Some New Organophosphonates and Their Adducts with Some Metal Salts
Authors: A. Saad Ebtsam , M. Ramadan Ramadan
Published: July 2006

The synthesis of the new monobasic organophosphonates (C2H5O)RPO(OH), R=benzyl, benzoyl, or butanoyl group, by the hydrolysis of the neutral esters (C2H5O)2RPO is reported. The IR spectra of the new ligands showed that they were existed in solutions as dimers. The pKa values in 50% aqueous ethanol found to be 4.46, 3.98, and 3.48 for the benzyl, butanoyl, and benzoyl derivatives, respectively. These values were consistent with the calculated π-electron charge density. Solid complexes of the benzoylphosphonate with Pr, Eu, Er, and Co metal ions as well as the benzyl–Eu complex were isolated. The complex ratios were found to be 1:2 metal to phosphonate dimer. The octahedral arrangements were completed by the presence of a coordinated bidentate NO3 group. Ionic properties of these complexes were ruled out from conductometric measurements. The IR spectra as well as the calculated π-electron charge density for the benzoyl complexes showed that the preference site for complex formation was from the carbonyl oxygen in contrast with the benzyl one where complexation through the phosphoryl group in addition to the hydroxyl oxygen.
Temperature Dependence of Adsorption of Caesium Ions on Crystalline Hydrous Titanium Dioxide Fibers
Authors: Hayashi Hiromichi , Iwasaki Takashi , Onodera Yoshio , Fujiki Yoshinori
Published: July 2006

The distribution coefficient of caesium ions, Kd, measured as a function of pH at 25–100 °C, decreased with increasing temperature. Enthalpy change of the adsorption of Cs+ on H2Ti4O9·nH2O estimated from the plot of logKd vs. T−1 in the range of 25–85 °C was −4.6 kcal mol−1. Above 95 °C, Kd values were lower than those extraporated from the plot due to a decrease in the crystallinity of the fibers.
Association of Carbon Tetrachloride, Chloroform, and Dichloromethane with Cyclodextrins in Aqueous Medium
Authors: Nishimura Makoto , Deguchi Toshio , Sanemasa Isao
Published: July 2006

The 1:1 host (cyclodextrin, CyD)–guest (CCl4, CHCl3, and CH2Cl2) association constants at 25 °C have been determined by making use of the volatilization rate of guest from aqueous into gaseous phase. No association was observed between γ-CyD and the three guests and between β-CyD and CH2Cl2.
[Cycloalkyl(phenylseleno)methylene]triphenylphosphoranes: Synthesis and Reactions of (Phenylseleno)alkenes
Authors: Minami Toru , Umezu Yasuo , Shikita Shoji , Okada Yoshiharu
Published: July 2006

The Wittig reaction of [cyclopropyl(phenylseleno)methylene]- and [cyclobutyl(phenylseleno)methylene]triphenylphosphoranes with aldehydes produced (Z)- and (E)-(1-cyclopropyl-1-phenylseleno)- and (1-cyclobutyl-1-phenylseleno)alkenes in moderate to good yields. The oxidation of the (E)-selenoalkenes to the corresponding selenoxides and subsequent thermolysis of the selenoxides led to cyclopropyl- and cyclobutylacetylene derivatives in good yields.
Photoaffinity Labeling of Pepsin
Authors: Yonezawa Hiroo , Wada Tetsuya
Published: July 2006

Photoaffinity reagents for pepsin [Ala–Gly–Phe(N3), Gly–Gly–Phe(N3)–Phe–Gly–OEt, Gly–Gly–Phe–Phe(N3)–Gly–OEt] were synthesized by a solution method. The pentapeptides were cleaved rapidly at the peptide bond between two aromatic amino acid residues by pepsin. This shows that Phe(N3) residues of the photoaffinity reagents bind with the S1 or S1′ site of pepsin. Pepsin was irradiated with photoaffinity reagents and the remaining activity was measured. The pepsin activity was decreased more rapidly in the presence of photoaffinity reagents, compared with that in the absence of photoaffinity reagents. Photoaffinity labeling occured at pH 2.0; however, did not occur at pH 4.0. Photoaffinity labeling of pepsin with 3H-labeled Gly–Gly–Phe(N3)–Phe–Gly–OEt showed that about 9% of the pepsin bound covalently with the photoaffinity reagent.
Cis/Trans Isomerization of Perinaphthothioindigo Dye Adsorbed on Silica Gel
Authors: Fukunishi Koushi , Kobayashi Masaya , Morimoto Akihiro , Kuwabara Masaki , Yamanaka Hiroki , Nomura Mototeru
Published: July 2006

The photoinduced and thermal cis/trans isomerization of the title compound adsorbed on silica gel has been studied by the immersion method. The cis/trans photoisomerization of the adsorbed state can be reversibly induced by irradiation. Thermal isomerization of the cis-to trans-isomer proceeds very fast on the surface. The results are compared with those obtained in solution.
Application of Improved Free-Energy Parameters of RNA Stability to Codon–Anticodon Interactions
Authors: Sugimoto Naoki , Sasaki Muneo
Published: July 2006

Free-energy parameters of the RNA duplex stability have been applied in order to investigate the complex between codon oligomers and anticodon loops in transfer RNA. The results suggested that the very large stability of the complex might be due to the stacking interactions of adjacent bases on the codon–anticodon helix and an additional hydrogen-bond formation of the core helix as well as a conformational change of the nucleic acid.
Reaction Behavior of Propylene Oxide in Various Solvents in the Presence of Boron Trifluoride
Authors: Sugiyama Shigeru , Ôhigashi Shinji , Sato Kiyozumi , Fukunaga Sadao , Hayashi Hiromu
Published: July 2006

The reaction behavior of propylene oxide with boron trifluoride was affected remarkably by solvent. In dioxane, the isomerization to propionaldehyde proceeded smoothly and selectively, while the reaction behavior in heptane, benzene, and tetrahydrofuran was quite different from that in dioxane.
Unequivocal Synthesis of the Four d,l-Pairs of 3-Substituted 2-Aminonorbornane-2-carboxylic Acids
Authors: Avenoza Alberto , Cativiela Carlos , Mayoral Jose A , Roy Miguel A
Published: July 2006

The Diels–Alder reaction between methyl α-cyanocinnamate and cyclopentadiene, as a key step in the synthesis of 2-amino-3-phenylnorbornane-2-carboxylic acids, is studied. The cycloadducts can be easily separated and converted into the amino acids through simple reactions.
Heterocycles Synthesis through Reactions of Nucleophiles with Acrylonitriles. 7. A Novel and Facile One-Step Synthesis of 4H-Thiopyrans
Authors: Abdel-Latif Fathy Fahim
Published: July 2006

Several new 4H-thiopyrans were synthesized via a facile one-step method. Structures and reaction mechanisms are also reported and supported by another synthetic routes.
Synthetic Inorganic Ion-Exchange Materials. LII. Ion-Exchange Selectivities of Crystalline Antimonic Acid for Tervalent Metal Ions
Authors: Abe Mitsuo , Hirata Masao , Tsuji Masamichi
Published: July 2006

The determination of selectivity coefficients for tervalent metal ions/hydrogen ions on cubic crystalline antimonic acid (C-SbA) was carried out for Ga3+, Fe3+, Ce3+, Sm3+, Y3+, Sc3+, and In3+ by batch equilibration at 30, 45, and 60 °C in nitric acid media. The selectivity in microamounts showed: Al3+<Tm3+<Ga3+<Yb3+=Y3+<Er3+<Dy3+<Fe3+<Eu3+<Sm3+<Ce3+<La3+<Sc3+=In3+. The ion-exchange isotherms of the systems of tervalent metal ions/hydrogen ions have also been studied on C-SbA. The selectivity coefficients in logarithm scale vs. equivalent fraction of metal ions in exchanger showed almost straight line, indicating monofunctional site with steric effect. In order to interpret the selectivity in microamounts of metal ions, hypothetical equilibrium constant was determined by extrapolating to zero loading of metal ions in C-SbA. From these values, the hypothetical thermodynamic data were calculated and evaluated.
Thermal Decomposition of Ammonium Copper(II) cyclo-Hexaphosphate Cu2(NH4)2P6O18·8.5H2O and Ammonium Calcium cyclo-Hexaphosphate Ca2(NH4)2P6O18·7H2O
Authors: Takenaka Atsushi , Kobayashi Hironobu , Tsuchie Katsumi , Motooka Itaru , Nariai Hiroyuki
Published: July 2006

Ammonium copper(II) and ammonium calcium cyclo-hexaphosphates, Cu2(NH4)2P6O18·8.5H2O and Ca2(NH4)2P6O18·7H2O, were prepared by a wet method. TG-DTA, HPLC-FIA, and X-ray diffraction method were used to investigate the thermal decomposition of the cyclo-hexaphosphates. The effect of humidity on the pyrolysis was also examined by the use of dry N2 gas and humid air. Cu2(NH4)2P6O18·8.5H2O was mainly decomposed to oligophosphates by hydrolysis. Parts of the oligophosphates were changed to poly- (n=1–13) and highpolyphosphates through a condensation. The poly- and the highpolyphosphates were more abundant under the dried conditions. Above 280 °C ammonia was liberated. As the crystalline products, CU2P2O7 was identified at 380 °C, and CU2P4O12 above 430 °C. Ca2(NH4)2P6O18·7H2O lost almost all its water of crystallization by 177 °C. As ammonia was evolved from 270 to 420 °C, accelerated by humidity, amorphous highpolyphosphates were formed. The formation of the highpolyphosphates was considered to proceed through a radical polymerization, since oligophosphates were scarcely detected in the course of the thermal reaction.
Study on the Claisen Rearrangement. VI. Catalytic Effect of Alkali Metal Salts on the Claisen Rearrangement of Allyl o- or p-Hydroxyphenyl Ether
Authors: Hayashi Takatoshi , Okada Yutaka , Inaba Takeshi
Published: July 2006

The Claisen rearrangement of allyl o- or p-hydroxyphenyl ether is catalyzed by alkali metal salts. The mechanism of the catalytic effect is different from that by Lewis acids such as zinc chloride. It is considered that the hydroxyl group is dissociated into phenoxide ion –O− with loss of its proton through attack by the anion residue of an alkali metal salt. Thus, the catalytic effect is attributable to a strong electron-releasing effect of phenoxide ion –O−. Furthermore, for the o-isomer, an intramolecular repulsion between the phenoxide ion –O− and the ethereal oxygen operates.
The Effect of Sodium Hydroxide on the Stereoselectivity of Hydrogenolytic Asymmetric Transaminations between (R)-2-Amino-2-phenylethanol and 2-Keto Acids
Authors: Tamura Minoru , Shiono Shozo , Harada Kaoru
Published: July 2006

Hydrogenolytic asymmetric transaminations between (R)-2-amino-2-phenylethanol and 2-keto acids were carried out over Pd catalyst in the absence or presence of various amount of sodium hydroxide in water or alcohols. The stereoselectivity of the reaction was significantly influenced by the amount of sodium hydroxide in the reaction mixture. When pyruvic acid was used in water the optical purity of alanine was 22% ee (R) and in 1 M (1 M=1 mol dm−3) sodium hydroxide solution it was 62% ee (S). When 2-oxobutyric acid was used in ethanol in the absence and presence of sodium hydroxide (1M), the optical yields of 2-aminobutyric acid were 2% ee (R) and 81% ee (S), respectively. In contrast, the addition of sodium hydroxide had little or no effect on the stereochemistry of the reaction using (S)-α-methylbenzylamine as a chiral source in aqueous or ethanolic solution. The substituent, additive, temperature, and solvent effects on the asymmetric reactions were examined in aqueous or ethanolic alkaline solution. Based on these experimental results, a possible explanation for the change in stereoselectivity by using sodium hydroxide is discussed.
Non-Catalyzed Thermal Reactions of Acylquinones with Allylstannanes
Authors: Maruyama Kazuhiro , Matano Yoshihiro
Published: July 2006

Thermal reactions of acylquinones with allylstannanes in benzene afforded several kinds of product after column chromatography on silica gel; acyl allyl quinones, acyl allyl epoxy quinones, cyclopentanoid compounds including stannyl moiety, allyl hydroxy quinones, acyl hydroquinones, and acyl allyl hydroquinones. The main product comprises cyclopentanoid compounds, which are novel [2+3] cyclo adducts with 1,2-migration of trialkylstannyl moiety. Spectroscopic examinations (1H NMR and Vis-UV) enabled us to confirm the reaction pathways that four types of precursors were initially generated via polarized tight pair and inverted to isolated products during purification by column chromatography. Similar reactions in acetonitrile showed a remarkable difference in the reactivity, that is, acyl allyl quinones and the corresponding hydroquinones are obtained, but the [2+3] cyclo adducts are not produced at all. From 1H NMR examination, it was confirmed that three types of precursor are generated via solvent separated ion pairs at the initial stage. The rather strong reactivity of acylquinones towards allylstannanes will be due to electron withdrawing ability of acyl group.
Linear Tetranuclear Copper(II) Complexes with Bridging Methoxide and a Schiff-Base Ligand: The Preparation and Magnetic Study of the [Cu(salpd-μ-O,O′)(μ-L)Cu(μ-CH3O)2Cu(μ-L)(sapd-μ-O,O′)Cu] Complexes (and L=Acetate or Formate Ions) and the Structure Determination of the Complex with L=Acetate
Authors: Fukuhara Ch\={o}ki , Tsuneyoshi Kazuhiko , Katsura Kosho , Matsumoto Naohide , Kida Sigeo , Mori Masayasu
Published: July 2006

The title complexes have been synthesized in quantitative yield from [Cu(salpd)] and copper(II) acetate or copper(II) formate , where H2salpd represents N,N′-disalicylidene-1,3-propanediamine. [Cu(salpd-μ-O,O′)(μ-L)Cu(μ-CH3O)2Cu(μ-L)(salpd-μ-O,O′)Cu] crystallizes in the monoclinic space group P21/n with formula=Cu4C40H44N4O10, F.W.=995.0, a=11.826(2) Å, b=17.192(4) Å, c=9.836(2) Å, β=94.08(2)°, V=1994.8(7) Å3 and Z=2 (R=3.83%), where L=CH3COO. The complex forms a centrosymmetric molecule made up of two units of [Cu(salpd-μ-O,O′)(μ-CH3COO)Cu] bound by a pair of methoxo bridges; each terminal copper(II) ion forms four short bonds with N and O atoms of salpd and a slightly longer (2.235(4) Å) axial bond with one of the oxygens of the acetato group, whereas each inner copper(II) ion is also pyramidally coordinated by two methoxo oxygens, one of the acetato oxygens, and one of the bridging salpd oxygens, the distant axial position being occupied (Cu–O=2.323(3) Å) by the remaining bridging salpd oxygen. The magnetic susceptibilities of the complexes in the 86.8–299.0 K range have been analyzed on the basis of a four-spin model for the linear copper(II) complexes, and the values of g and Jij, based on the Heisenberg-type Hamiltonian H=−2ΣJijSi·Sj, have been estimated as g (average)=2.13, J12=−390 cm−1, J13=67 cm−1 and J14=34 cm−1 in the complex with acetate bridges, and as g (average)=2.20, J12=−263 cm−1, and J13=39 cm−1 and J14=J34=0 cm−1 in the complex with formate bridges, where the numbering refers to the 3–1–2–4 arrangement of the Cu2+ ions.
Kinetics and Mechanisms of Oxidations by Metal Ions. X. Oxidation of Phosphinic and Phenylphosphinic Acids by Tris(polypyridyl)iron(III) Complexes
Authors: Sharma Kamla , Prakash Aditya , Mehrotra Raj N
Published: July 2006

A kinetic study on the oxidation of phosphinic(hypophosphorous) and phenylphosphinic acids by trispolypyridyliron(III) complexes using excess of either phosphinic or phenylphosphinic acid has been made in perchloric acid. The pseudo first-order rate constant kobs, with respect to iron(III) complex, is independent of [H+]. The results indicated that phenylphosphinic acid is more reactive than phosphinic acid towards any given iron(III) complex. The formation of an intermediate complex is indicated by the kinetics and supported by the spectrophotometry of the reaction mixture. The differences in the observed thermodynamic parameters of this intermediate complex, probably an outer-sphere complex, and those predicted by the Fuoss equation are discussed. It is suggested that the ‘inactive’ form of either of the acid is reactive towards the iron(III) complexes. It is also shown that the rate of disproportionation of the intermediate complex is not affected by the form of phosphinic or phenylphosphinic acid entering into the complex formation. The values of β2 and k1, the equilibrium constant for the formation of the oxidant-substrate complex and the rate limiting constant for its disproportionation respectively, are reported together with respective thermodynamic and activation parameters.
Crystal Structure and Magnetic Property of Cubane Tetranuclear Copper(II) Complex with Ferromagnetic Coupling
Authors: Matsumoto Naohide , Kondo Takashi , Kodera Masahito , Okawa Hisashi , Kida Sigeo
Published: July 2006

The magnetic susceptibility measurement down to the liquid helium temperature and the single-crystal X-ray analysis of alkoxo-oxygen bridged tetranuclear copper(II) complex [CuL]4 have been performed, where H2L is a tridentate ligand derived from condensation of 3-ethoxymethylene-2,4-pentanedione and 2-aminoethanol. The magnetic data demonstrated that the four unpaired electrons of the four copper(II) ions are ferromagnetically coupled, the ground spin state of the cubane molecule being S=2. The structural analysis has confirmed several structural features, i.e., the distorted Cu4O4 cubane structure, the square pyramidal coordination geometry, nearly perpendicular arrengement between adjacent basal coordination planes, and inequivalent Cu–O bond distances.
Synthesis and Four Isomers of 5-Arylamino-3-isopropyl-6-methyl-6-phenyl-1,2,4-trioxanes
Authors: Yamamoto Hiroshi , Nishio Takehiko , Hirayama Masatoshi , Akutagawa Masamoto , Kashima Choji
Published: July 2006

5-Arylamino-3-isopropyl-6-methyl-6-phenyl-1,2,4-trioxanes were synthesized by autoxidation of imines in the presence of isobutyraldehyde. Their four isomers have been identified and the anomerization of 5-arylamino-1,2,4-trioxanes has been detected by the 13C NMR spectra in chloroform-d.
Reaction of Iminophosphoranes with a Diazonium Salt: Synthesis of Wholly Aromatic Aminophosphonium Salts
Authors: Takeishi Makoto , Shiozawa Naoyuki
Published: July 2006

N-Phenyliminotriphenylphosphorane reacts with benzenediazonium tetrafluoroborate to form wholly aromatic N,N-diphenylaminotriphenylphosphonium tetrafluoroborate. This synthetic method can be applied to prepare a cationic polymer having the aminophosphonium structure.
A New Preparative Method of 4-Hydroxybenzofuran-2-carboxylic Acid Derivatives
Authors: Yamaguchi Seiji , Yamamoto Ken-ichi , Ueda Toshinori , Morikawa Tetsuya , Kawase Yoshiyuki
Published: July 2006

4-Oxo-4,5,6,7-tetrahydrobenzofuran-2-carboxylic acid was prepared from 1,3-cyclohexanedione and ethyl bromopyruvate. Dehydrogenation of this acid or its methyl ester gave 4-hydroxybenzofuran-2-carboxylic acid derivatives.
Oxidation of Aromatic s-Alcohols with Cobalt(III) Acetate in the Presence of Sodium Bromide
Authors: Hirano Masao , Morimoto Takashi
Published: July 2006

The title oxidation in acetic acid resulted in a selective formation of the corresponding ketones in excellent yields under mild conditions.
One-Pot C-Arylmethylation of Active Methylene Compounds with Aromatic Aldehydes Induced by a Me3SiCl–NaI–MeCN Reagent
Authors: Sakai Takashi , Miyata Kazuyoshi , Tsuboi Sadao , Utaka Masanori
Published: July 2006

Reaction of active methylene compounds with aromatic aldehydes in the presence of chlorotrimethylsilane–sodium iodide–acetonitrile reagent gave C-arylmethylated products, the reduced condensation products, although the reaction either with aliphatic primary aldehydes or with isobutyraldehyde afforded alkylidenation products or dihydrofurans.
Synthesis of a 24-Epimeric Mixture of 24-Methyl-19,29-dinorlanost-9(11)-en-3-one
Authors: Makino Tetsuya , Murae Tatsushi , Tsuyuki Takahiko , Takahashi Takeyoshi
Published: July 2006

A 24-epimeric mixture of 24-methyl-19,29-dinorlanost-9(11)-en-3-one was synthesized from 24-methylenecycloartanol. The synthesis comprises acid-cleavage of the cyclopropane ring, 4β-demethylation, the Barton reaction of the 3-nitrile, dehydration of the 11β-hydroxy derivative, and oxidation of the 19-hydroxy derivative followed by photolysis.
Selective Dimerization of Alkyl Crotonates Catalyzed by Iron(0) Complexes Having 1,2-Bis(dimethylphosphino)ethane Ligands
Authors: Komiya Sanshiro , Oyasato Naohiko , Furukawa Tomoyuki
Published: July 2006

Highly selective dimerization of alkyl crotonates has been performed in the presence of a catalytic amount of FeHNp(dmpe)2 or FeH2(dmpe)2/UV irradiation at room temperature.
The Adsorption Equilibria of Organic Vapors on Activated Carbon at High Temperatures
Authors: Hori Hajime , Tanaka Isamu , Akiyama Takashi , Arai Yasuhiko
Published: July 2006

Nitrogen gas containing organic vapor was introduced into a column packed with activated carbon at high temperatures up to 200 °C, and the amounts of the solvents adsorbed were measured. The adsorption equilibrium data for single- and bi-component systems could be correlated by the Freundlich and extended Freundlich isotherms respectively.
Electrical Conduction in Some Ternary Metallo-Organic Solid Complexes of Biological Importance and Compensation Effect
Authors: Mallik Biswanath
Published: July 2006

The electrical conduction in some ternary solid complexes of Cu(II) with 2,2′-bipyridyl/1,10-phenanthroline and several amino acids (e.g., α-alanine, leucine, tryptophan, glycine, and norvaline) is studied as a function of temperature. These materials show semiconductivity. Results suggest that true compensation effect is valid for most of the materials studied. Importance of characteristic temperature (To) in biological process is pointed out.
A New Crystalline Form of Bis(1,2-diphenyl-1,2-ethenedithiolato)nickel: Asymmetric β-Ni(dpedt)2
Authors: Megnamisi-Belombe Michel , Nuber Bernhard
Published: July 2006

The full structure of a new crystalline form of bis(1,2-diphenyl-1,2-ethenedithiolato)nickel, β-Ni(dpedt)2, has been determined by single crystal X-ray diffraction at room temperature. The structure was refined by full matrix least-squares to a final Rw=0.038. Comparison of this triclinic (P\bar1) structure with the monoclinic (P21/n) α-form established previously reveals that the difference between the two structures is basically due to a different conformation of the phenyl rings, which gives rise to dissymmetry in β-Ni(dpedt)2.
Ionization and Dissociation of Picric Acid in 4-Methyl-2-pentanone Solutions at Various Water Concentration
Authors: Sekine Tatsuya , Naganawa Hirochika
Published: July 2006

The spectrum of picric acid in 4-methyl-2-pentanone solutions which contained the acid and water at several concentrations was determined in the wavelength range from 330 to 500 nm and the data were statistically analyzed. It was concluded that picric acid molecules formed ion pairs together with four water molecules in these solutions and the ion pairs thus formed dissociated partially. Both of the ion pairs and dissociated picrate ions in these solutions had strong absorption in the visible range where no absorption was found with the acid molecules but the spectra of these two species were different. The formation and dissociation constants of the ion pairs were also calculated from the data and the role of water in these chemical reactions was considered.
Synthesis and Properties of Copper(II) Halide Complexes with Imino Oximes
Authors: Wan Songping , Mori Wasuke , Yamada Shoichiro , Murahashi Shun-Ichi
Published: July 2006

Two types of imino oxime copper(II) complexes were obtained by the reactions of copper(I) halides CuX (X=Br, I) with imino oximes (3-[2-[(alkylamino)ethyl]imino]-2-butanone oximes or 3-[2-[(dialkylamino)ethyl]imino]-2-butanone oximes, abbreviated as Hdox-enRR′). One type contains the binuclear complexes [Cu2(dox-enRR′)2]2+ and uncoordinated halide anions. The magnetic susceptibilities measured over the temperature range 77–320 K show a strong antiferromagnetic spin coupling interaction through the N–O bridge in these complexes. The magnetic behavior can be explained by using the Bleaney–Bowers equation. It is assumed that the complexes of the other type consist of copper(I) and copper(II) in 2:1 ratio without spin-coupling interaction between the copper ions. The plot of the reciprocal magnetic susceptibilities versus temperatures is linear.
Novel Synthesis of Carbamic Ester from Carbon Dioxide, Amine, and Ortho Ester
Authors: Ishii Shigeru , Nakayama Hidenobu , Yoshida Yasuhiko , Yamashita Tadataka
Published: July 2006

Carbon dioxide reacted with aliphatic amines and ortho esters to form carbamic esters in good yields. The influence of different ortho esters on the carbamate synthetic reaction is described. In the case of orthocarbonates, carbamic esters were obtained in high yields. The reaction of carbon dioxide, amines, and ortho esters may involve a competitive reaction between the esterification of carbamic acid produced by a reaction of carbon dioxide with amine, and the alkylation of amine.
Electronic Control of Stereoselectivity in the Metal Hydride Reductions of 1,2,3,4-Tetrahydro-1,4-methanonaphthalen-9-ones
Authors: Okada Keiji , Tomita Seiji , Oda Masaji
Published: July 2006

Stereoselectivity in the metal hydride reduction of a series of substituted 1,2,3,4-tetrahydro-1,4-methanonaphthalen-9-ones was investigated in relation to their homoconjugation character. The observed stereoselectivity sequence was found to be parallel with the homoconjugation sequence: the portion of anti-attack increases as the benzene ring becomes electron-rich. The results are rationalized in terms of the transition state model proposed by Cieplak or of the contribution of the nonclassical carbocation in the transition state.
Stereoselective Syntheses of 2-Deoxy-β-C-arabino- and ribopyranosides: 2-Deoxy-β-arabino- and ribopyranosyl Cyanides
Authors: Tatsuta Kuniaki , Hayakawa Jun , Tatsuzawa Yukio
Published: July 2006

2-Deoxy-β-arabino- and ribopyranosyl cyanides, which should be suitable for the syntheses of biologically active products, were stereoselectively prepared from the reaction of the enones, 1,5-anhydro-2-deoxy-erythro-hex-1-en-3-ulose derivatives, with acetone cyanohydrin, followed by the stereoselective reduction of the producing ketones with NaBH4–CeCl3·7H2O and l-Selectride, respectively.
Manganese(III)-Mediated Formylation of Aromatic Compounds in the Presence of Malonic Acid
Authors: Nishino Hiroshi , Tsunoda Katsunori , Kurosawa Kazu
Published: July 2006

The reaction of naphthalenes with malonic acid in the presence of manganese(III) acetate gives naphthalenecarbaldehydes and naphthalenecarboxylic acids. Similar reactions of anthracene, pyrene, and methoxybenzenes also yield formylated and carboxylated products. It was found that the formyl group introduced to the aromatic ring was not derived from carboxymethyl radical generated directly by the thermolysis of manganese(III) acetate, but from a dicarboxymethyl radical formed by the interaction of malonic acid and manganese(III) acetate. In addition, it was also found that the dicarboxymethyl radicals attacked the position of the highest electron density on the aromatic ring and that this formylation was effective when the ionization potential of the aromatic compound was lower than 7.8 eV.
The Desulfurization of Polynuclear Aromatic Sulfur Compounds with a Raney Nickel
Authors: Nagai Masatoshi , Urimoto Hideo , Uetake Kazuya , Sakikawa Noriyuki , Gonzalez Richard D
Published: July 2006

The mechanism of the desulfurization of the polynuclear thiophene compounds with a Raney nickel was studied in ethanol at atmospheric pressure and from 0 to 78.3 °C. The desulfurization rate was initially fast but reached zero in about 30 minutes. The major products were biphenyl in the desulfurization of dibenzothiophene (1), 1-phenylnaphthalene in the desulfurization of benzo[b]naphtho[1,2-d]thiophene (2), and 2-phenylnaphthalene in the reaction of benzo[b]naphtho[2,3-d]thiophene (3) and benzo[b]naphtho[2,1-d]thiophene (4). The desulfurization extent for the four compounds decreased in this sequence: 3>1>2>4. The extent of the desulfurization of the polynuclear thiophene compound was not related to the reaction indices, Fr(E), Fr(N), and Fr(R), of the sulfur atom of the compounds, which were calculated by using a simple Hückel theory; rather, it was related to both the free valence and the π-electron density. Therefore, the polynuclear thiophene compounds were considered to adsorb on a Raney nickel through the free-electron pair of the sulfur atom; consequently, the adsorption led to the C–S bond scission.
The Adsorption and Desorption of Nitrogen Oxide by the Aqueous Dispersion of the Chelate Resin-Immobilized Iron(II) Complex
Authors: Toshima Naoki , Asanuma Hiroyuki , Yamaguchi Kazuaki , Hirai Hidefumi
Published: July 2006

Aqueous dispersions of the chelate resin–iron(II) complex were prepared by ion-exchange in water from iron(II) sulfate and a chelate resin containing iminodiacetic acid moieties. The resulting dispersions in water (50 cm3) can adsorb 78% of the nitrogen oxide (NO) from 6 dm3 of nitrogen gas containing 1000 ppm of nitrogen oxide at 25 °C. The adsorption rate of NO by the dispersions depends greatly on both the particle size of the chelate resin used and the concentration of iron(II) in the supernatant. A fast adsorption of nitrogen oxide can be achieved by using small particles of the chelate resin and by dissolving a large amount of iron(II) ions in the aqueous part of the dispersions. The adsorption and desorption of nitrogen oxide can be understood in terms of a 1:1 reversible coordination of NO to the iron(II) ion immobilized on the chelate resin. The equilibrium constant, enthalpy change, and entropy change for the above adsorbing reaction were 3.11×104 dm3 mol−1, −45.6 kJ mol−1, and −68.2 J K−1 mol−1 respectively. Since the adsorbing reaction of NO in this system is reversible, the adsorbed NO can be released by heating the dispersions which have already adsorbed NO. The amount of the released NO can be predicted from the equilibrium constant at the releasing temperature. Moreover, a concentrated recovery of the NO can be achieved by the present aqueous dispersions system.
Synthesis of Both the Enantiomers of Phoracantholide I, A Defensive Secretion of the Eucarypt Longicorn (Phoracantha synonyma), Employing Microbial Asymmetric Reduction with Immobilized Baker’s Yeast
Authors: Naoshima Yoshinobu , Hasegawa Hidenobu , Nishiyama Tadashi , Nakamura Akihiro
Published: July 2006

Highly optically pure (R)- and (S)-phoracantholide I were synthesized in relatively short steps starting from diethyl 3-oxoglutarate by means of a microbial asymmetric reduction of the intermediate keto acid with immobilized baker’s yeast entrapped in gels of κ-carrageenan.
Mössbauer Spectroscopic Study of Superconducting Y–Ba–Cu(Fe)–O Ceramics and Gamma-Ray Irradiation Effect
Authors: Nishida Tetsuaki , Ide Hiroshi , Maeda Yonezo , Nasu Hiroyuki , Yagi Toshirou , Sakai Akira , Takashima Yoshimasa
Published: July 2006

Mössbauer spectra of YBa2(Cu1−xFex)3O7−δ ceramics (x=0.003, 0.008, and 0.017) measured at room temperature show a superposition of three quadrupole doublets. An outermost doublet (δ=0–0.04 mm s−1, Δ=1.94–1.98 mm s−1) is ascribed to high-spin Fe4+ ions present at substitutional sites of Cu2+ ions (Cu(2) site). An intermediate doublet (δ=−0.03–0.02 mm s−1, Δ=1.12–1.17 mm s−1) is ascribed to intermediate-spin Fe3+ ions present at substitutional sites of Cu3+ ions (Cu(1) site). An innermost doublet is ascribed to Fe3+ ions (high spin) with tetrahedral symmetry, present along the b-axis. A decrease in Tc from 72 to 60 K, observed when iron content (x) is increased from 0.008 to 0.017, is explained by a lowered layer structure composed of “dimpled” CuCO4 planes, owing to a displacement of O(4) oxygen atoms sharing CuO5 tetragonal pyramids and CuO4 square planars. One-dimensional chains composed of CuO4 square planars proved to be primarily affected by γ-ray irradiation, whereas no change of Tc was observed. Low-temperature Mössbauer measurements revealed that “partial Debye temperatures” are 330 and 740 K for the chains and layer structure, respectively.
Synthetic Photochemistry. XLVII. Formation and Degenerate Cope Rearrangement of 9-Dicyanomethylenebarbaralane
Authors: Tian Guan Rong , Sugiyama Shigeru , Mori Akira , Takeshita Hitoshi
Published: July 2006

Photolysis of 2-dicyanomethylenehomobarrelene gave 9-dicyanomethylenebarbaralane, 5-dicyanomethylenetricyclo[4.3.0.02,9]nonadiene, and 1-dicyanomethyleneindan. Dicyanomethylenebarbaralane showed time-averaged NMR signals.
A Mild, High-Yield Conversion of Thiols into Disulfides Using Disulfide Dication Salt: A New Redox System
Authors: Fujihara Hisashi , Akaishi Ryouichi , Furukawa Naomichi
Published: July 2006

A new redox reaction of thiols with disulfide dication salt, 1,5-dithioniabicyclo[3.3.0]octane bis(trifluoromethanesulfonate), under mild conditions gave the corresponding disulfides in good yields together with 1,5-dithiacyclooctane.
Ab Initio Calculation for the Interaction Energy of He–He+
Authors: Ichihara Akira , Itoh Reikichi
Published: July 2006

Using an ab initio calculation with a configuration interaction (CI) treatment, the interaction energy of a He–He+ system in the ground (X2Σu+) electronic state was calculated. For X2Σu+He2+ calculations, the Gaussian-type [6s3pld] basis set of Khan and Jordan was employed, and the effect of the basis set superposition error was estimated.
γ-Radiolysis of 1-Substituted 5-Fluorouracil Derivatives
Authors: Kuroda Tokuyuki , Hisamura Koji , Matsukuma Ikuo , Nishikawa Hiroshi , Nakamizo Nobuhiro
Published: July 2006

A new concept, “Radiation-Induced Drug (RID)”, was proposed as a novel type of drugs for cancer therapy. To test the usefulness of this concept, 5-fluorouracil (5-FU) derivatives having various types of substituents at the 1-position were prepared and the γ-radiolyses of their aqueous solutions were studied. The compounds having sulfonyl and thioureido groups as the substituents produced efficiently 5-FU with high G values upon γ-irradiation. The medium effects on the radiolyses revealed that the above two substituents were removed mainly with HO· and hydrated electrons eeq−.
Facile Synthesis of (2S,3R,4R)-2-Hydroxymethyl-3,4-pyrrolidinediol and 4-Acetamido-1,2,3-tri-O-acetyl-4-deoxy-l-xylopyranose from the Photoproduct of d-Mannose
Authors: Hosaka Akira , Ichikawa Shuji , Shindo Hiroko , Sato Tadashi
Published: July 2006

(Synthesis of 2S,3R,4R)-2-hydroxymethyl-3,4-pyrrolidinediol and 4-acetamido-1,2,3-tri-O-acetyl-4-deoxy-l-xylopyranose were attained in four steps from d-mannose, using iron(III)-catalyzed photoreaction as a key reaction.
Stereoselective Synthesis of [1]Benzopyrano[4,3-b]pyrrol-4(3H)-ones through Cycloadditions of Azomethine Ylides with α,β-Unsaturated Esters
Authors: Ueno Kazunori , Kanemasa Shuji , Tsuge Otohiko
Published: July 2006

Cycloadditions of azomethine ylides generated from α-benzylideneamino nitriles bearing a hydroxyl or its O-protected moiety with α,β-unsaturated esters such as dimethyl maleate, fumarate, methyl acrylate, crotonate, methacrylate, and cinnamate lead stereoselectively to 3,3a-trans-3a,9b-cis-3a,9b-dihydro[1]benzopyrano[4,3-b]pyrrole-4(3H)-ones after subsequent lactonization.
Allylation of Quinones via Photoinduced Electron-Transfer Reactions from Allylstannanes
Authors: Maruyama Kazuhiro , Imahori Hiroshi
Published: July 2006

Photochemical reactions of quinones with allylstannanes provided four types of products: adducts of allyl group to the carbonyl oxygens of quinones, adducts of allyl group to the olefinic carbons, adducts of allyl group to the carbonyl carbons, and hydroquinones. An electron-transfer mechanism was confirmed by 1H-CIDNP (Chemically Induced Dynamic Nuclear Polarization) method. This study suggests that a) photoinduced electron transfer from allylstannanes to quinones produces the corresponding quinone anion radicals and tin cation radicals, b) the tin cation radicals cleave to give allyl radicals as well as tin cation, and c) the allyl radicals attack the quinone anion radicals resulting in the formation of final products, allylated quinones.
Synthesis and Enantiomer Recognition of Dipodands and Crown Ethers Containing the 2,3:6,7-Dibenzobicyclo[3.3.1]nona-2,6-diene Residue as the Chiral Subunit
Authors: Naemura Koichiro , Fukunaga Rink\={o} , Komatsu Masanori , Yamanaka Masatoshi , Chikamatsu Hiroaki
Published: July 2006

Five new optically active crown ethers and six optically active dipodands are reported. The crown ethers were synthesized by using (+)-(1S,4R,5S,8R)-2,3:6,7-dibenzobicyclo[3.3.1]nona-2,6-diene-4,8-diol and (+)-(1S,4R,5S,8R)-4,8-bis(hydroxymethyl)-2,3:6,7-dibenzobicyclo[3.3.1]nona-2,6-diene as a chiral subunit and the dipodands contained the 2,3:6,7-dibenzobicyclo[3.3.1]nona-2,6-diene residue as a chiral anchor group. The enantiomer recognition behaviour of these compounds was evaluated by the enantiomer differential transport of methyl (±)-phenylglycinate and (±)-1,2-diphenylethylamine hydrochloride through bulk liquid membrane.
Synthesis and Reductive Desulfurization of Crown Ethers Containing Thiophene Subunit
Authors: Sone Tyo , Sato Kazuaki , Ohba Yoshihiro
Published: July 2006

Crown ethers containing 3,4-thiophenediyl and 3,4-thiophenediylbis(methylene) subunits as a ring constituent were prepared starting from 2,5-bis(ethoxycarbonyl)-3,4-thiophenediol and 2,5-dichloro-3,4-bis(chloromethyl)thiophene, respectively. A Raney nickel desulfurization of the thiophene-containing crown ethers afforded crown ethers having two adjacent side chains, such as a methyl or ethoxycarbonylmethyl group. The extraction ability of these crown ethers towards alkali metal cations was also examined by the solvent extraction method.
Cycloaddition vs. Michael Addition in the Metal Halide/Amine-Induced Reactions of α-(Alkylideneamino) Esters with Electron-Deficient Olefins
Authors: Kanemasa Shuji , Yoshioka Manabu , Tsuge Otohiko
Published: July 2006

The lithiated intermediate derived from methyl 2-(benzylideneamino)propanoate and lithium bromide/triethylamine undergoes cycloaddition and Michael addition with methyl acrylate. 1,3-Dipole character of the intermediate is suggested on the basis of the product ratios obtained under a variety of conditions. The reaction mechanism via a four-centered transition state is proposed.
Isolation of Four 2,3,5,6,11,11b-Hexahydro-3-oxo-1H-indolizino[8,7-b]indole-5-carboxylic Acids from Clerodendron Trichotomum Thunb and Properties of Their Derivatives
Authors: Irikawa Hajime , Toyoda Yasuhiro , Kumagai Hiroaki , Okumura Yasuaki
Published: July 2006

Four 2,3,5,6,11,11b-hexahydro-3-oxo-1H-indolizino[8,7-b]indole-5-carboxylic acids, plausible precursors of trichotomine, were isolated as the methyl esters from Clerodendron trichotomum Thunb, and the structures elucidated on the basis of their spectral and chemical evidences. The existence of two pairs of the C-11b epimers in the above plant were supported by the methoxide-catalyzed equilibrations of the compounds having the substituent on C-11b. Blue pigments were formed from the isolated compounds.
Synthesis of Heterobinudear Cu(II)Ni(II) Complexes with Bis(tetraazamacrocycle)
Authors: Mochizuki Katsura , Endoh Yumiko
Published: July 2006

A new series of heterobinudear Cu(II)Ni(II) complexes with bis(tetraazamacrocycle), i.e., 7,7′-polymethylenebis[2,12-dimethyl-3,7,11,17-tetraazabicyclo[11.3.1]heptadeca-1(17),2,11,13,15-pentaene]copper(II)nickel(II) perchlorates with polymethylene bridges with a length of 2–6-C, were synthesized by a template reaction.
Hydrolysis of Spiro Derivatives that Undergo No Shrinkage on Polymerization
Authors: Tagoshi Hirotaka , Endo Takeshi
Published: July 2006

Acid-catalyzed hydrolyses of spiroorthoeters (1, 2a, 2b, and 2c) and spiroorthocarbonates (3 and 4) were carried out to give the corresponding ring-opening reaction products. The ring-cleavage modes of these spiro derivatives depended on the structure of intermediate cations.
Sommelet–Hauser Rearrangement of Oxygen and Sulfur Containing Heteroaromatic Sulfonium Ylides
Authors: Yamamoto Makoto , Kakinuma Madoka , Kohmoto Shigeo , Yamada Kazutoshi
Published: July 2006

A Sommelet–Hauser rearrangement of sulfonium ylides of 4H-pyran-4-ones, furan, and thiophenes are discussed. The sulfonium halides which were prepared from excess dimethyl sulfide with corresponding halides were treated with NaH or NaOR in a polar solvent to give moderate to good yields of rearranged products.
Active Sites of a Reduced Molybdena–Alumina Catalyst. A Transient Study of Hydrodenitrogenation of Carbazole and Acridine
Authors: Nagai Masatoshi , Masunaga Takashi
Published: July 2006

A response study of the hydrodenitrogenation of acridine and carbazole on a reduced MoO3/Al2O3 catalyst was performed at 300 °C and 10.1 MPa total pressure. Acridine was strongly adsorbed on the acidic sites of the catalyst surface for hydrogenation, while carbazole was weakly adsorbed not only on the same sites as acridine, but also on the terminal oxygen anion sites in the presence of strong bases.
A Theoretical Study of the Ionized State of Polymers with the Localized Molecular Orbital Method
Authors: Imamura Akira , Ye Kehong , Taketoshi Masahiro
Published: July 2006

A localized molecular orbital method for the investigation of the ionized state of polymers is presented. It is based on the Crystal Orbital Method(CO). By performing a super-cell method and Edmiston and Ruedenberg’s LMO method, the Bloch function was transformed into a nearly completely localized Wannier function. Furthermore, the calculation of the configuration interaction was introduced to obtain more reasonable results. The present method was applied to polyacetylene (PA), polyethylene (PE), and polypropylene (PP). Ionization potentials of these polymers were calculated and compared with experimental and other theoretical results. All the calculations were performed using the CNDO/S approximation.
The Formation of Monodispersed Indium(III) Hydroxide Particles by Forced Hydrolysis at Elevated Temperature
Authors: Hamada Shuichi , Kudo Yoshiyuki , Minagawa Kazuhiro
Published: July 2006

Rather poorly crystallized spherical particles of indium(III) hydroxide were produced by forced hydrolysis at 100°C for 120 min under the conditions of 6.0×10−4 mol dm−3 for indium(III) ions, 1.0×10−3 mol dm−3 for nitric acid, and 1.25 for a concentration ratio, [SO42−]t/[In3+]t, respectively, having an average size of 0.48 μm with a relative standard deviation of 0.09. On the other hand, cubic particles of well-crystallized indium(III) hydroxide were yielded in a nitrate solution that was free from sulfate ions and at the same concentrations. The cubic particles grew through a polynuclear layers mechanism. Monomeric hydroxo complexes basically acted as precursors of the spherical particles, together partly with polymeric ones. The point of zero charge was estimated as being at the same pH (7.7) for both the hydroxide and oxide particles prepared from the nitrate system, in contrast to those of 7.0 and 5.4 for the respective particles obtained from the sulfate system.
Chiral Tolans: A New Family of Ferroelectric Liquid Crystals. Synthesis and Mesomorphic Properties
Authors: Seto Koji , Shimojitosho Hiroshi , Imazaki Hideyuki , Matsubara Hiroshi , Takahashi Shigetoshi
Published: July 2006

Diphenylacetylene homologues having a chiral alkyl group, synthesized by a palladium-catalyzed coupling reaction, provide a new series of liquid crystalline materials which form chiral smectic C (SmC*) phases exhibiting ferroelectric properties. Mesomorphic properties of the compounds composed of three aromatic rings is strongly affected by the position of an acetylenic linkage and the direction of an ester linking unit. The effect of variations in terminal chain length on the thermal stabilities of the smectic A (SmA) and SmC* the two and three aromatic ring systems has been systematically studied.
Structural Determination of Ancovenin, a Peptide Inhibitor of Angiotensin I Converting Enzyme
Authors: Wakamiya Tateaki , Ueki Yasuyuki , Shiba Tetsuo , Kido Yasuji , Motoki Yoshinobu
Published: July 2006

The structure of ancovenin, a new peptide inhibitor of angiotensin I converting enzyme was determined chemically. Ancovenin is composed of 16 amino acid residues including three lanthionine residues which form a complex tricyclic structure bridged by sulfide bonds. Moreover, this peptide includes dehydroalanine as one of its unusual amino acids. In the present study, plausible mechanisms of the Edman degradation of dehydroalanine and lanthionine-containing peptides were also elucidated.
Photochemical and Photophysical Behavior of p-Methoxyphenyl alkenyl Phenanthrenecarboxylates. I. Structure and Competitive Formation of Intramolecular Cycloaddition Products
Authors: Sakuragi Hirochika , Tokumaru Katsumi , Itoh Hiroki , Terakawa Kohki , Kikuchi Katsuo , Caldwell R A , Hsu Chien-Chung
Published: July 2006

Irradiation of (E)-3-(p-methoxyphenyl)-3-pentenyl, (E)-4-(p-methoxyphenyl)-4-hexenyl, and (E)-5-(p-methoxyphenyl)-5-heptenyl 9-phenanthrenecarboxylates (B-2E, B-3E, and B-4E, respectively) in benzene gave intramolecular [2+2] cycloadducts, cyclobutane derivatives (CB-2, CB-3, and CB-4, respectively) possessing the same conformation as an intermolecular [2+2] cycloadduct (CB-0) between methyl 9-phenanthrenecarboxylate (9-MCP) and trans-anethole (t-AN), and oxetane derivatives (OX-2, OX-3, and OX-4, respectively) arising from intramolecular cycloaddition between the carbonyl group and the olefinic double bond. However, (E)-4-(p-methoxyphenyl)-3-butenyl and (E)-5-(p-methoxyphenyl)-4-pentenyl 9-phenanthrenecarboxylates (A-2E and A-3E, respectively) afforded only products derived from oxetane precursors.