bluuebunny/crossref_metadata_2025_split huggingface dataset:
Spectroscopic and Kinetic Studies of the Photochromism of N-Salicylideneanilines and Related Compounds
Authors: Nakagaki Ryoichi , Kobayashi Takayoshi , Nakamura Junko , Nagakura Saburo 
Published: July 2006

Abstract
Photochromism of N-salicylideneanilines and related compounds was studied by measuring the electronic and vibrational spectra of the transient species. The rise time of the transient electronic spectra of the photochromic colored species was measured by picosecond time-resolved spectroscopy and was found to be dependent upon solvent viscosity. FT IR spectra showed that the photochromic colored species took the keto amine form. Picosecond kinetic analysis demonstrated that an intermediate existed in the transfer process from cis-keto amine to the photochromic species. These facts led us to the conclusion that the photochromic phenomenon of N-salicylideneanilines occurred through enol imine\oversethν→enol imine*→cis-keto amine*→the intermediate→trans-keto amine (photochromic species).
Reactivity of Excited Triplet Alkyl Ketones in Solution. I. Quenching and Hydrogen Abstraction of Triplet Acetone
Authors: Anpo Masakazu , Kubokawa Yutaka 
Published: July 2006

Abstract
The photolysis of acetone in various solutions has been investigated by analysis of reaction products as well as absorption spectroscopy. The rate of photolysis of acetone in aqueous solution decreases on addition of methanol or with increasing concentration of acetone, being much higher than that in methanol and heptane solutions. The results suggest that intermolecular hydrogen abstraction plays a significant role in quenching of triplet acetone. This is supported by spectroscopic studies which reveal formation of the enol form of acetone as an intermediate in the decay process of triplet acetone.
The Reactions of Sodium 1-Benzyl-1,4-dihydronicotinamide-4-sulfinate with Halogen Compounds
Authors: Inoue Hiroo , Inoguchi Nobuaki , Imoto Eiji 
Published: July 2006

Abstract
Sodium 1-benzyl-1,4-dihydronicotinamide-4-sulfinate (BNA-SO2Na) reacts with various halogen compounds, YZCHBr, through the cleavage of the carbon-sulfur bond to give sulfones, (YZCH)2SO2, in Y=Ph or PhCH=CH and Z=H; trans-stilbene in Y=Ph and Z=CH(Br)Ph or CH(OCH3)Ph; and the reduction products, YZCH2 and (YZCH)2, in Y=Ph, Z=Br, and Y=H, Z=PhCO. The BNA-SO2Na is converted to 1-benzylnicotinamide bromide, while sulfur dioxide or sulfite ions are formed.
Shock Tube Study on the Mechanism of Hydrogenation and Pyrolysis of Acetylene
Authors: Ogura Hiroo 
Published: July 2006

Abstract
Mixtures of acetylene and deuterium have been subjected to shock heating in a single-pulse shock tube in the temperature range 1000–1600 K. The reaction products were quite the same as those obtained from the pyrolysis of acetylene alone, with a considerable increase in the yields of the minor products. The predominance of 1-buten-3-yne formation and no appreciable dependence of its rate on the concentration of deuterium suggest that the initiation step is the same as that proposed in the pyrolysis of acetylene by itself, viz. 2C2H2→C4H3+H, the initiation step of the bimolecular reaction of C2H2 with D2 not being important. A complementary analysis of the isotopic distributions of 1-buten-3-yne, ethylene, and acetylene shows that hydrogenation also occurs by a free-radical chain mechanism, and the C4H3 radical and H atom generated by the initiation step are mainly responsible for the formation of 1-buten-3-yne and ethylene, respectively. The ethylene formation was of first-order in both acetylene and deuterium, and the second-order rate constant was obtained as
k(cm^3 mol^-1 s^-1)=(4.9±1.3)×10^11exp((-34900±600)/RT).
Synthesis of Corticotropin Peptides. XV. The Synthesis of an Undecapeptide and a Nonapeptide Derivatives Related to the Amino Acid Sequence 11–21 of Corticotropin
Authors: Inouye Ken , Watanabe Kunio 
Published: July 2006

Abstract
An undecapeptide derivative, Z–Lys(Mhoc)–Pro–Val–Gly–Lys(Mhoc)–Lys(Mhoc)–Arg–Arg–Pro–Val–Lys–(Mhoc)–NHNH2, corresponding to the amino acid sequence 11–21 of corticotropin (ACTH)is synthesized. In the course of the synthesis a key intermediate H–Arg(NO2)–Arg(NO2)–Pro–OH is derived from Z–Arg(NO2)–Arg–(NO2)–Pro–OBzl by the treatment with hydrogen bromide in acetic acid. This procedure eliminates the danger of racemization associated with the use of alkali for saponification. The synthesis is also described of a nonapeptide derivative, Z–Lys(Mhoc)–Pro–Val–Gly–Lys(Mhoc)–Lys(Mhoc)–Arg(NO2)–Arg(NO2)–Pro–OH (amino acid sequence 11–19 of ACTH), in which a new protecting group, 9-methyl-9-fluorenyloxycarbonyl (Mfoc), is utilized for the temporary protection of an α-amino function.
Substituent Effects on Dissociation Constants of trans-3-Hydroxy-6-styryl-4-pyrones
Authors: Besso Hiromichi , Imafuku Kimiaki , Matsumura Hisashi 
Published: July 2006

Abstract
The dissociation constants of 6-substituted 3-hydroxy-4-pyrones and trans-6-(substituted styryl)-3-hydroxy-4-pyrones were measured spectrophotometrically in 50% aqueous methanol at 25 °C. The results are correlated to the substituent constants σ, the following equations being obtained: pKa=8.57–1.53 σ and pKa=8.54–0.23 σ. The transmission coefficient through the styryl group was found to be 0.150 for the 3-hydroxy-6-styryl-4-pyrone system.
Stereochemistry of Cobalt(III) Complexes with Thioethers. I. Circular Dichroism Spectra of Complexes with Bi- or Terdentate Thioethers
Authors: Yamanari Kazuaki , Hidaka Jinsai , Shimura Yoichi 
Published: July 2006

Abstract
Five (bidentate-N,S or -O,S)bis(ethylenediamine)cobalt(III) complexes have been optically resolved and their absolute configurations deduced from their circular dichroism (CD) spectra, where bidentate-N,S or -O,S are NH2(CH2)2S−, NH2(CH2)2SR (R=CH3 and C2H5), and CH3S(CH2)nCO2− (n=1 and 2). The chromatographic, CD, and NMR behaviors suggest that the thioether donor atoms are coordinated stereoselectively producing the Δ-(S) or Λ-(R) complexes. Three (terdentate-N,S,O)[1,1,1-tris(aminomethyl) ethane] cobalt(III) complexes of NH2(CH2)2SCH2CO2−, NH2(CH2)2S(CH2)2CO2−, and l-CH3SCH2CH(NH2)CO2− have been prepared and the complexes of the former two ligands optically resolved; the absolute configurations have been discussed on the basis of the CD spectra.
Circular Dichroism Spectra of Cobalt(III)–Ammine Complexes Containing Optically Active 1,3-Diphenyl-1,3-propanediamine or 1,2-Diphenyl-1,2-ethanediamine
Authors: Arakawa Sumio , Kashiwabara Kazuo , Fujita Junnosuke , Saito Kazuo 
Published: July 2006

Abstract
A series of optically active cobalt(III) ammine complexes containing (S,S)-1,3-diphenyl-1,3-propanediamine (dppn) or (S,S)-1,2-diphenyl-1,2-ethanediamine (stien) were prepared. The sign of circular dichroism (CD) of [Co(NH3)4(S,S-dppn)]Br3 depends on solvents in the first absorption band region. The CD magnitude of trans-[Co(NH3)2(S,S-dppn)2]3+ varies significantly with solvent variations in the same energy region. The CD curve of the vicinal effect of (S,S)-dppn derived from the two diastereomers of cis-[Co(NH3)2(S,S-dppn)2]3+ is different from the CD spectra of both [Co(NH3)4(S,S-dppn)]3+ and trans-[Co(NH3)2(S,S-dppn)2]3+. The CD spectra of the (S,S) -stien complexes are insensitive to solvent variations and the vicinal contributions of the (S,S)-stien calculated from a variety of the (S,S)-stien complexes are similar to one another.
Photolytic Oxidation of Alkylbenzenesulfonic Acids by Aqueous Sodium Hypochlorite
Authors: Nakamura Masao , Ogata Yoshiro 
Published: July 2006

Abstract
Photolyses of alkylbenzenesulfonic acids, such as benzene-, p-toluene-, and p-ethylbenzenesulfonic acids, in aqueous solution by sodium hypochlorite have been studied. In the presence of a large excess of hypochlorite, benzenesulfonic acid is completely photolyzed to give carbon dioxide and sulfuric acid. Irradiation of an equimolar mixture of substrate and hypochlorite in an aqueous solution yields the corresponding alkylbenzene, alkylphenol, arylalkyl alcohol and arylalkylaldehyde, some of which may be produced by an attack of the oxidant on alkyl chain. In some cases, small amounts of diaryl sulfones and chlorinated compounds are also detected.
Variations in the Vibrational Structures of Fluorescence Spectra of Naphthalene and Pyrene in Water and in Aqueous Surfactant Solutions
Authors: Nakajima Akira 
Published: July 2006

Abstract
Variations in the vibrational structures of the fluorescence spectra of naphthalene and pyrene in water and in aqueous solutions of sodium dodecyl sulfate (SDS) have been studied by comparison with those in various organic solvents. The results were applied to the determination of the critical micelle concentration of SDS.
Formations and Reactions of Cation Radicals from Compounds Possessing a p-Dimethylaminophenyl Group by Reactions with o-Sulfobenzoic Anhydride
Authors: Nagai Toshikazu , Shingaki Tadao , Yamada Hirokazu 
Published: July 2006

Abstract
It was found that cation radicals were formed from a number of substrates bearing a p-dimethylaminophenyl group, such as N,N,N′,N′-tetramethyl-p-phenylenediamine (TMPD) and N,N,N′,N′-tetramethylbenzidine (TMB), by reactions with o-sulfobenzoic anhydride (o-AH). The systems, bis(p-dimethylaminophenyl)methane (BMM) and tris (p-dimethylaminophenyl) methane (TMM) with o-AH, gave their cations in the presence of oxygen, showing that the oxygen eliminates the hydrogen atoms of the cation radicals derived from BMM and TMM. The reactions of N,N-dimethylaniline (DMA) with o-AH gave rise to isolations of BMM and N-methylaniline, along with the formations of the cation radical of TMB and the crystal violet cation (TMM+). The mechanisms of the reactions are proposed.
Conversion of Cobalt(II) and Nickel(II) Fixed on the Ion Exchange Resin into Their Trifluoroacetylacetonates and Gas Chromatography of the Chelates
Authors: Tamura Tooru , Ohzeki Kunio , Kambara Tomihito 
Published: July 2006

Abstract
The conversion of cobalt(II) and nickel(II) ions collected on the ion exchange resin into the chelate compounds with trifluoroacetylacetone (Htfa) has been studied in various solvents. In the presence of pyridine, cobalt and nickel ions were quantitatively extracted from the resin into organic phase in the form of the base adducts [Co(tfa)2(py)2] and [Ni(tfa)2(py)2], respectively. The thermogravimetric and gas chromatographic behaviors of these compounds have been investigated. A gas chromatographic separation of [Ni(tfa)2] from [Co(tfa)2] was successfully performed.
1,3-Dipolar Cycloadditions to Bicyclic Olefins. I. 1,3-Dipolar Cycloadditions to Norbornadienes
Authors: Taniguchi Hisaji , Ikeda Toshikazu , Yoshida Yoshihiro , Imoto Eiji 
Published: July 2006

Abstract
The 1,3-dipolar cycloadditions of phenylglyoxylonitrile oxide, benzonitrile-N-phenylimine, or N-phenyl-C-p-nitrophenylnitrone to norbornadiene, 2,3-dicyanonorbornadiene, and 2,3-bis(methoxycarbonyl)norbornadiene give the endo-adducts, together with the exo-adducts. These findings show that the 1,3-dipolar cycloadditions to norbornadienes do not follow the “exo rule.” It is suggested that the present 1,3-dipolar cycloadditions are kinetically controlled reactions. The endo-side of norbornadienes is found to be homoconjugated by their NMR spectra. The homoconjugation must be responsible for the observed phenomenon.
Copper-initiated Decomposition of N,N-Dichloromethanesulfonamide
Authors: Torimoto Noboru , Shingaki Tadao , Nagai Toshikazu 
Published: July 2006

Abstract
The reactions of N,N-dichloromethanesulfonamide (I) with substrates such as hydrocarbons and ethers gave the N-substituted methanesulfonamide (II) and methanesulfonamide (III) in the presence of copper. The reaction with 2-methylbutane gave the product only with a tertiary C–H bond, though the singlet nitrene which was generated from methanesulfonyl azide reacted with the primary, secondary, and tertiary C–H bonds in the ratio of 1 : 4.2 : 9.6. The reactions with the tertiary C–H bonds of cis- and trans-1,4-dimethylcyclohexanes proceeded non-stereospecifically, in contrast to those of the nitrene with them. The addition of a radical inhibitor, hydroquinone, reduced the yield of II, while it increased the yield of III. The reaction with alcohols led to a quantitative yield of III, accompanied by the corresponding aldehydes. These results suggest that the reaction proceeds not by a nitrene mechanism, but by a metal-radical mechanism.
Carbon-13 NMR Spectra of 4-Chromanone, 4H-1-Benzothiopyran-4-one, 4H-1-Benzothiopyran-4-one 1,1-Dioxide, and Their Substituted Homologs
Authors: Senda Yasuhisa , Kasahara Akira , Izumi Taeko , Takeda Toru 
Published: July 2006

Abstract
The 13C NMR spectra of 4-chromanone, 4H-1-benzothiopyran-4-one, 4H-1-benzothiopyran-4-one 1,1-dioxide, and their methyl and phenyl substituted homologs were examined. The salient effect depending on the kinds of the hetero atoms or the group at the 1-position has been observed on the chemical shifts, especially for C-2, C-3, C-8, C-4a, and C-8a.
Micelle Formation of Purified Dinohylnaphthalenesulfonates in Benzene
Authors: Inoue Kiyoshi , Nose Yoshiharu , Watanabe Harumichi 
Published: July 2006

Abstract
The removal of trace amounts of unsulfonated dinonylnaphthalene contained in sulfonates by rubber membrane dialysis in pentane increased the apparent aggregation number of the micelles of dinonylnaphthalenesulfonate measured using vapor-pressure osmometry. The interaction between the cation and sulfonate ion was a factor affecting the aggregation, in addition to the steric factor of the hydrocarbon group and the solute-solvent interaction.
The ESR and ENDOR Spectra of the [2.2](2,7)Pyrenophane Anion Radical
Authors: Ishizu Kazuhiko , Sugimoto Yoshinori , Umemoto Teruo , Sakata Yoshiteru , Misumi Soichi 
Published: July 2006

Abstract
The ESR and ENDOR spectra of the [2.2](2,7)-pyrenophane anion, which was prepared by reduction with alkali metal in ethereal solvents, were observed. From a comparison of the spin densities for the anion with those for the pyrene anion, the delocalization of the unpaired electron between the stacked aromatic rings was demonstrated.
The Preparation of Mixed Carbonate Complexes of Cobalt(III) with 2-Pyridinecarboxylic Acid
Authors: Ida Yayoi , Sakai Masaharu , Sakai Shigeru , Shibata Muraji 
Published: July 2006

Abstract
By the successive replacement of CO32− ions in the [Co(CO3)3]3− complex with 2-pyridinecarboxylic acid (Hpicol), the [Co (CO3)2(picol)]2− complex and two geometrical isomers of the [CoCO3(picol)2]− complex have been prepared. By the reaction of the cis-[Co(CO3)2(NH3)2]− complex and picol, three geometrical isomers of the [CoCO3(picol)(NH3)2] have been prepared.
The Radical Addition of Toluene to Fluorocyclobutenes
Authors: Kimoto Hiroshi , Muramatsu Hiroshige , Inukai Kan 
Published: July 2006

Abstract
Fluorine-containing cyclobutane derivatives, 1-benzyl-1,2,2,3,3,4,-hexafluorocyclobutane (1) and 1,5,6,6,7,7-hexafluorobenzo[2,3]bicyclo[3.2.0]hept-2-ene (2), were synthesized in one step by the radical reaction of toluene and hexafluorocyclobutene. On the other hand, a similar reaction of toluene and 1,2-dichlorotetrafluorocyclobutene gave no adduct, but a substituted product, 1-benzyl-2-chlorotetrafluorocyclobutene (4).
Studies of the Aqueous Solutions of Guanidinium Salts. VI. Complexes of Guanidinium Halides and Symmetrical Tetraalkylammonium Halides
Authors: Miyajima Koichiro , Yoshida Hiromitsu , Nakagaki Masayuki 
Published: July 2006

Abstract
Guanidinium halides (bromide and chloride) form crystalline complexes with symmetrical tetraalkylammonium bromides (tetraethyl-, tetrapropyl-, and tetrabutylammonium bromides and tetrabutylammonium chloride) in aqueous solutions at room temperature. These complexes were analyzed and found to be either binary complexes of two kinds of salts or ternary complexes with water as a third component. Each complex showed complicated peaks in the DSC measurements, which indicated the phase transition in the solid state. The solubility of each salt in ternary systems was measured, and phase diagrams were constructed for some of the ternary systems. A mutual salting- in effect was observed in all the ternary systems, and this effect was discussed in terms of complex formation and the structual change of water.
Magnetic Cross-over in Hexa-coordinate Iron(II) Complexes of Several Schiff Bases
Authors: Maeda Yonezo , Shite Shunji , Takashima Yoshimasa , Nishida Yuzo 
Published: July 2006

Abstract
Iron(II) complexes with the Schiff bases of 6-methyl-2-pyridinecarbaldehyde and 2-quinolinecarbaldehyde, and with α,α′-diimine were prepared. The M\ddotossbauer spectra and magnetic susceptibilities of the complexes, Fe(cbi)2(NCS)2·2/3CHCl3, Fe(tbi)2(NCS)2·CHCl3, Fe(mpmea)2(ClO4)2, and Fe(mepma)3(ClO4)2, were studied in the range of 80–298 K. It was found that these complexes show a 5T2-1A1 spin transition in the solid state.
Calculation of Directly-Bonded Nuclear Spin-Spin Coupling Constants with Localized Orbitals
Authors: Hirao Kimihiko , Kato Hiroshi 
Published: July 2006

Abstract
The directly-bonded nuclear spin-spin coupling constants were calculated by a perturbation method involving the summing over singly-excited states using localized orbitals. It is shown that a localized representation of orbitals in the perturbation expansion can be of considerable value both for interpretative purposes and for assessing the rate at which the pertubation expansion converges.
The Effects of Sodium Chloride on the Ultrasonic Properties of an Aqueous Solution of Isopropyl Alcohol
Authors: Nishikawa Sadakatsu , Mashima Mitsuo , Yasunaga Tatsuya 
Published: July 2006

Abstract
The ultrasonic absorptions in an aqueous solution of isopropyl alcohol with sodium chloride (NaCl) were measured in the frequency range from 2.5 to 220 MHz at 25 °C. The ultrasonic properties were remarkably affected by the addition of NaCl, and a new absorption was found around 7 MHz in addition to that observed in the solution without NaCl. The results were discussed in terms of the forming effects of NaCl on the water structure.
Formation of Indan and 2,3-Dihydrobenzofuran via Intramolecular Insertion of Phenylcarbene
Authors: Sekiguchi Akira , Ando Wataru 
Published: July 2006

Abstract
Pyrolysis of p-t-butyl- and p-trimethylsilylbenzaldehyde tosylhydrazone sodium salts gave indans via intramolecular C-H insertions of o-substituted phenylcarbenes through carbene-carbene rearrangements. Pyrolysis of o- and p-alkoxybenzaldehyde tosylhydrazone sodium salts afforded 2,3-dihydrobenzofurans.
The Formation and Properties of Solid Solutions in the PbTiO3-Pb(Ni1⁄2W1⁄2)O3 System
Authors: Torii Yasuyoshi 
Published: July 2006

Abstract
By usual and high-pressure techniques, a series of PbTiO3–Pb(Ni1⁄2W1⁄2)O3 solid solution was formed with a perovskite structure. With an increase in the Pb(Ni1⁄2W1⁄2)O3 content, the Curie point shifted to lower temperatures and the degree of tetragonality decreased. The thermal-expansions were also measured, showing anomalies at the Curie point.
Photochemistry in the Adsorbed Layer. VIII. Lifetimes of Excited Alkyl Ketones and Alkyl Radicals Adsorbed on Porous Vycor Glass
Authors: Anpo Masakazu , Wada Toshiaki , Kubokawa Yutaka 
Published: July 2006

Abstract
The photolyses as well as the absorption spectra of adsorbed 3-methyl-2-butanone and 3-methyl-2-pentanone have been investigated in the presence and absence of nitrogen monoxide. The Stern-Volmer relationship was applied to the decrease in the rate of photolysis caused by addition of nitrogen monoxide. From the results together with those for acetone, 2-butanone, and 2-pentanone, it has been concluded that in the adsorbed layer the more blue shifted, i.e., the more strongly hydrogen bonded to the surface OH groups a ketone molecule, the shorter the lifetime of its excited state. It has been found that the lifetime of the alkyl radical on the surface increases with the decrease in its ionization potential, leading to the decrease in the strength of its interaction with the surface. Special features of the photolysis in the adsorbed layer have been described for 3-methyl-2-butanone photolysis.
A Convenient Two-Step Synthesis of Bis(polyalkylphenyl) Disulfides from Polyalkylbenzenes
Authors: Suzuki Hitomi , Shinoda Misao 
Published: July 2006

Abstract
Heating of polyalkyliodobenzenes with copper(I) thiocyanate in phosphoric tris-dimethylamide at 180–190 °C for a short period of time gives the corresponding bis(polyalkylphenyl) disulfides in high yields.
Preparation and Stereochemistry of Cobalt(III) Complexes Containing N-Methylbis(2-aminoethyl)amine
Authors: Kojima Masaaki , Iwagaki Masaru , Yoshikawa Yuzo , Fujita Junnosuke 
Published: July 2006

Abstract
Seven new cobalt(III) complexes containing N-methylbis(2-aminoethyl)amine (4-methyldiethylenetriamine, abbreviated as dema) were prepared and their structures were determined by electronic, circular dichroism, and PMR spectroscopy. For the mixed [Co(dien) (dema)]3+ complex (dien=diethylenetriamine), three geometric isomers, s-fac, u-fac, and mer were isolated. The [Co(dema)2]3+ complex formed only s-fac isomer. A conformational analysis was carried out to compare the stability of these geometric isomers.
Various Acceleration Conditions of Pummerer Reaction Observed in the Total Synthesis of Illudins
Authors: Matsumoto Takeshi , Shirahama Haruhisa , Sakan Fujio , Takigawa Kazuko 
Published: July 2006

Abstract
Pummerer reaction of highly functionalized sulfoxides were examined under various modified conditions. The results indicated that added base and/or neighboring acetoxyl group accelerated the reaction.
Sydnones. Synthesis and Photochromic Behavior of 3-(3-Pyridyl)sydnone Derivatives and a 4-Alkenyl-3-phenylsydnone
Authors: Inoue Shinichi , Asai Nobuyoshi , Yasuda Gorou , Hori Takuya 
Published: July 2006

Abstract
Six new-sydnones [3-(3-pyridyl)-4-(p-chlorophenyl)sydnone (1), 3-(3-pyridyl)-4-(p-tolyl)sydnone (2), 3-(3-pyridyl)-4-(p-nitrophenyl)sydnone (3), 3-(3-pyridyl)-4-(p-aminophenyl)sydnone (4), 3-(3-pyridyl)-4-(p-acetamidophenyl)sydnone (5), and 3-phenyl-4-(α-phenylstyryl)sydnone (6)] were synthesized and examined for photochromic behavior. Sydnone 2 exhibited photochromism in the solid state upon UV irradiation (230–580 nm).
Reactions of Perfluoro-2,5-dimethyl-3,4-hexanedione with Amines
Authors: Shin-ya Seiji , Ishikawa Nobuo 
Published: July 2006

Abstract
Perfluoro-2,5-dimethyl-3,4-hexanedione and aromatic or aliphatic amines gave the respective 1:1 adducts in good yields. With excess amounts of aliphatic amines or basic aromatic amines such as p-anisidine, the perfluorodiketone gave oxamides. With o-phenylenediamine, it gave 2,3-dihydroxyquinoxaline.
Phenanthro[4,5-bcd]furan Derivatives. IV. A Synthesis of Phenanthro[4,5-bcd]furan
Authors: Horaguchi Takaaki 
Published: July 2006

Abstract
Phenanthro[4,5-bcd]furan was synthesized from 1,2,3,8,9,9a-hexahydrophenanthro[4,5-bcd]furan-3-ol by dehydrogenation with palladium-charcoal. Some chemical reactivities and spectral properties of phenan thro [4,5-bcd]furan were investigated and compared with those of phenantherene and dibenzofuran. The results suggest that phenanthro[4,5-bcd]furan has the chemical properties of both phenanthrene and dibenzofuran, and does not have a large strain in the fused-ring system. Also, the reactivities of 1,2,3,8,9,9a-hexahydrophenanthro[4,5-bcd]furan-3-one were explored.
Proton Spin Lattice Relaxation in Blends of Natural Rubber and Polyterpene
Authors: Ito Masayoshi , Tanaka Koji 
Published: July 2006

Abstract
NMR measurements were carried out on blends of natural rubber (NR) and polyterpene (PT). The blends of NR and PT are perfectly mixed. The motion of NR chains play a dominant role in the glass transition of the blends. The mobility of NR segments in the blends are constrained by the presence of PT.