bluuebunny/crossref_metadata_2025_split huggingface dataset:
Asymmetric Hydrocyanation of Benzaldehydes Catalyzed by (5R)-5-(4-Imidazolylmethyl)-2,4-imidazolidinedione
Authors: Danda Hidenori 
Published: July 2006

Abstract
The catalytic activity of (5R)-5-(4-imidazolylmethyl)-2,4-imidazolidinedione (3) was examined in the asymmetric hydrocyanation of 3-phenoxybenzaldehyde (1a) to (S)-2-hydroxy-2-(3-phenoxyphenyl)acetonitrile ((S)-2a), an important alcohol moiety of optically active pyrethroid insecticides. Among the catalysts, 3-benzyl derivative (3d) exhibited moderate enantioselectivities for 1a and other benzaldehydes.
On the Reaction of N-(Diphenylphosphinyl)-1-phenylethanimine with Aromatic Aldehydes Giving 4-Aryl-2,6-diphenylpyridine Derivatives
Authors: Kobayashi Tomoshige , Kakiuchi Hidetaka , Kato Hiroshi 
Published: July 2006

Abstract
N-(Diphenylphosphinyl)-2-phenyl-1-azaallyl anion (1), generated from N-(diphenylphosphinyl)-1-phenylethanimine, reacted with aromatic aldehydes in a 2 : 1 molar ratio to give 4-aryl-2,6-diphenylpyridines in moderate yields. The intervention of N-phosphinyl-1-azadiene intermediates is proposed on the basis of the independent synthesis of an N-phosphinyl-1-azadiene and its conversion into a pyridine by the reaction with 1.
Trialkylborane as an Initiator and Terminator of Free Radical Reactions. Facile Routes to Boron Enolates via α-Carbonyl Radicals and Aldol Reaction of Boron Enolates
Authors: Nozaki Kyoko , Oshima Koichiro , Utimoto Kiitiro 
Published: July 2006

Abstract
A variety of trialkylborane-induced reactions were examined for the preparation of the α-carbonyl radicals: (1) addition of alkyl radical to methyl vinyl ketone, (2) reduction of α-halo ketone, and (3) intramolecular radical addition to α,β-unsaturated carbonyl moiety. Trialkylborane reacted with α-carbonyl radicals to give boron enolates. The resulting boron enolates were efficiently trapped by carbonyl compounds to give β-hydroxy ketones in good yields.
Time Courses of the Numbers of Spins from a Single or Two Organic Compounds on a Decationated Y-Type Zeolite
Authors: Kashiwagi Hiroshi 
Published: July 2006

Abstract
The time courses of the number of organic radicals produced on the surface of a decationated Y-type zeolite (HY) were followed with electron paramagnetic resonance spectroscopy after the removal of heptane (a solvent). Regardless of the presence of the heptane, the relationship between the amount of adsorption and the number of spins for a binary system of HY and a single organic compound was linear and reversible, suggesting the significance of the presence of an adsorption equilibrium. On the surface of HY, there are two kinds of active sites possessing different times required for attaining constant numbers of spins. Cation radicals from a strong donor (perylene) adsorbed in advance on HY were gradually replaced by those from a weak donor (naphthalene), while a small number of cation radicals from naphthalene adsorbed in advance on HY remained after contact with a sufficiently large quantity of perylene. The coexistence of both donor and acceptor molecules on HY increased the number of both cations and anion radicals, which were significantly dependent on the order of adsorption.
Fluctuation of Local Field and Depolarization Ratio of the ν1 Raman Line of Carbon Tetrachloride in Carbon Disulfide Solution
Authors: Hyodo Shi-aki 
Published: July 2006

Abstract
The depolarization ratio of a molecule having Td symmetry has been expressed in terms of the mean-square fluctuation of the local field which is felt by a molecule in the condensed phase. The fluctuation of the polarizability at each position in the scattering volume was found to dominantly affect local-field fluctuation. The concentration dependence of the depolarization ratio for the ν1 Raman line of carbon tetrachloride in a carbon disulfide solution could be well described by this expression.
The Electronic Structure of the Fulvene Radical Cation
Authors: Takahashi Ohgi , Kikuchi Osamu 
Published: July 2006

Abstract
The molecular and electronic structures of the unsubstituted fulvene radical cation, FV+·, were investigated by ab initio SCF calculations. The planar 2A2 state, which corresponds to removing an electron from the butadienic moiety in the five-membered ring, was found to be the ground state of FV+·, and is more stable than the planar 2B1 state, which corresponds to an olefin radical cation, by about 26 kcal mol−1. The barrier to rotation around the exocyclic C–C bond in the 2A2 radical cation was calculated to be about 63 kcal mol−1. The importance of electronic relaxation in substituted fulvene radical cations is discussed in connection with the rotational barrier.
Ion-Exchange Properties and Thermal Stability of Hydrous Titanium(IV)– Zirconium(IV) Oxide Ion Exchanger
Authors: Yamazaki Hiromichi , Inoue Yasushi , Kikuchi Naoki , Kurihara Hiroshi 
Published: July 2006

Abstract
Ion-exchange properties and thermal stability were studied for hydrous TiIV–ZrIV oxide ion exchangers with various contents of titanium. The cation-exchange capacity increased with the titanium content in the exchanger, along with a decrease in the anion-exchange capacity. Though the affinity for representative metal ions increases with the acidity of the exchange sites, no such simple relation holds for transition metal ions. Exchangers with 30 to 70 mol% Ti (the mol% of Ti to Ti+Zr) do not suffer from drastic changes in both the water content and crystallinity upon heating to 500°C; they are much more heat-resistant than component simple hydrous metal oxides. Though the total cation-exchange capacity decreases with increasing temperature during a heat treatment, only a minute amount of the acidic sites dissociating at a pH lower than the isoelectric point of the exchangers with ≤70 mol% Ti increases upon heating. The effect of a heat treatment on the distribution coefficients of cations has been explained by these observations.
Chemical Synthesis of Branched Oligoribonucleotides
Authors: Sekine Mitsuo , Heikkilä Jarmo , Hata Tsujiaki 
Published: July 2006

Abstract
This paper describes the full detail of the chemical synthesis of branched oligoribonucleotides by use of appropriately protected adenosine 2′,3′-diphosphate derivatives (13 and 30), as key intermediates, which were synthesized by a series of reactions involving phosphoryl rearrangement via a new phosphorylation process. Branched triribonucleotides ApCpG (21) and ApUpG (27) were obtained by using the synthetic unit 13. Several problems during these syntheses were discussed. The use of 30 as an improved building unit enabled us to prepare synthetic intermediates as neutral, i.e., fully esterified species which allowed facile purification of them by means of silica-gel column thin-layer chromatography throughout the synthesis of a branched hexaribonucleotide derivative CpUpGpApCpG.
Synthesis of Proline and 2-Piperidinecarboxylic Acid via Cobalt-Catalyzed Isomerization–Carbonylation of N-Acyl Unsaturated Cyclic Amines
Authors: Amino Yusuke , Nishi Seiichi , Izawa Kunisuke 
Published: July 2006

Abstract
N-Acyl derivatives of proline and 2-piperidinecarboxylic acid (pipecolic acid) were synthesized in moderate yield from N-acyl unsaturated cyclic amines through cobalt-catalyzed isomerization–carboxylation under hydroformylation conditions in the presence of H2O. A possible mechanism for the process is discussed which is related to that of the amidocarbonylation (cobalt-catalyzed formation of N-acyl α-amino acid from aldehyde, amide and carbon monoxide).
Synthetic Inorganic Ion-Exchange Materials LX. Ion Exchange and Chromatographic Separation of Alkali Metal Ions on Cubic Ammonium Molybdate–A Novel Cation Exchanger
Authors: Khan Abdul Jabbar , Abe Mitsuo , Tsuji Masamichi , Kanzaki Yasushi 
Published: July 2006

Abstract
The ion-exchange selectivity of H+-form of cubic ammonium molybdate (H-CAM) was studied for alkali metal ions in both HNO3 and NH4NO3 media. Ideal ion-exchange reaction was observed in both the media with high selectivity for Rb+ and Cs+. The selectivity sequence was found to be Li+&lt;Na+&lt;K+&lt;Rb+&lt;Cs+ in accordance with the Eisenman sequence-1 in both the media, with separation factors greater than the commercial polystyrene strong acid exchange resin. Efficient separation of alkali metal ions could be achieved on H-CAM column.
A Polarographic Study of the Glycine Complexes of Copper(II), Lead(II), Cadmium(II), and Manganese(II)
Authors: Yamashita Hiroshi , Nozaki Toru , Fukuda Yoshihito , Kabata Toshiyuki 
Published: July 2006

Abstract
From the polarographic behavior of copper (II), lead(II), cadmium(II), and manganese(II) in aqueous glycine solutions at an ionic strength of 0.4 mol dm−3 adjusted with sodium perchlorate, the species of the metal complexes and their stability constants were determined.
A New Type of Reductive Cleavage of Disulfide in Quadruply ortho-Substituted Diphenyl Disulfide by Neighboring Thiolate Anion
Authors: Fujihara Hisashi , Chiu Jer-Jye , Furukawa Naomichi 
Published: July 2006

Abstract
The reaction of bis[2,6-bis(bromomethyl)phenyl] disulfide with thiourea or sodium sulfide showed an unusual reductive. cleavage of disulfide linkage with elimination of bromine by neighboring-group participation of the generated thiolate anion. Its reaction gave the structurally intriguing thiols which indicated the facile anodic oxidation.
Preparation and Property of Zirconia-Pillared Montmorillonite Having Different Pillar Populations
Authors: Suzuki Kenzi , Horio Masakazu , Masuda Hiroyuki , Mori Toshiaki 
Published: July 2006

Abstract
Zirconia-pillared clay was prepared by ion-exchanging montmorillonites having different cation exchange capacities (CEC’s) in an aqueous solution of ZrOCl2. The amount of zirconia incorporated as pillars varied depending on the CEC of the starting clay. The interlayer distance was almost the same: ca., 0.8 nm. These findings suggest that the distance between pillars or the lateral distance should be different from one zirconiapillared clay to another. As a result of pillaring the surface area was 200–260 m2 g−1. The thermal stability was examined in terms of a decrease in the surface area after heating at elevated temperatures.
Hydrolytic Metalloenzyme Models. Micellar Effects on the Activation of the Hydroxyl Groups of N-Alkyl-2-(hydroxymethyl)imidazole Ligands by Cu2+ in the Transacylation of p-Nitrophenyl Picolinate
Authors: Tagaki Waichiro , Ogino Kenji , Tanaka Osamu , Machiya Koji , Kashihara Nobuyuki , Yoshida Toshiharu 
Published: July 2006

Abstract
The activation of the hydroxyl groups of two N-methyl/dodecyl-2-(hydroxymethyl)imidazole ligands by complexation with Cu2+ was investigated kinetically by observing the rates of the release of p-nitrophenol in the transacylation of p-nitrophenyl picolinate (PNPP). The kinetics were carried out in aqueous buffers of pH ranging from 4.5 to 8.0 at 25 °C in the absence of surfactant micelles for a hydrophilic N-methyl ligand, and in the presence of micelles for a lipophilic N-dodecyl ligand. The kinetic analyses indicated that the 1:1 and 2:1 complexes of the ligand and Cu2+ are active nucleophiles with the N-methyl and N-dodecyl ligand, respectively. The pKa’s of the hydroxyl groups of these complexes were determined to be 7.00 in water and 6.41 in aqueous CTABr micelles, respectively, by analyses of the pH-rate profiles. The rate constants, which show the nucleophilic reactivities of ionized hydroxyl anions of complexes toward PNPP, were determined to be kN=1.11×104 and 1.25×106 mol−1 dm3 s−1 with N-methyl and N-dodecyl ligands, respectively, indicating that the latter micellar complex is 100-times more active than the former non-micellar counterpart.
A Facile Synthesis of 2-Aza-1,3-butadienes
Authors: Okamoto Hidenori , Kato Shozo 
Published: July 2006

Abstract
2-Aza-1,3-butadienes bearing alkoxyl substituent were obtained easily by the reaction of ketimines with orthoesters. The reaction proceeded smoothly by the addition of small amount of p-toluenesulfonic acid. When acetals were used in place of orthoesters, the corresponding 2-aza-1,3-butadienes were similarly prepared.
Formation and Molecular Structure of the 2 : 1-Adducts of 1-Alkoxy-2-benzopyrylium-4-olates with Carbon Disulfide
Authors: Nakano Hirofumi , Tamura Hatsue , Ibata Toshikazu 
Published: July 2006

Abstract
The Rh2(OAc)4-catalyzed decomposition of alkyl o-(diazoacetyl)benzoates in the presence of carbon disulfide gave two 2 : 1-adducts of the intermediate 1-alkoxy-2-benzopyrylium-4-olates with carbon disulfide together with a small amount of 5-(o-alkoxycarbonylphenyl)-1,3-oxathiole-2-thiones. The intramolecular carbene-carbonyl reaction of the carbenoid generated by the decomposition of the diazo ketones was clarified to be much faster than the intermolecular attack on carbon disulfide. The molecular structure of the major 2 : 1-adduct of 1-methoxy-2-benzopyrylium-4-olate with carbon disulfide was determined by means of X-ray crystallography. The crystals of the adduct are triclinic with space group P\bar1, and with the unit-cell dimensions of a=12.213(1), b=11.846(1), c=7.0403(2) Å, α=93.395(6), β=102.147(5), γ=109.536(7)°, and Z=2. The final R value is 0.044 for 2597 observed reflections. The structure was confirmed to be (S-endo, S′-endo).
A Stopped-Flow Kinetic Study of the Solubilization of Acridine Orange and Its 10-Alkyl Derivatives into the Micelle of Sodium Dodecyl Sulfate
Authors: Kubota Yukio , Omura Naofumi , Murakami Kiyofumi 
Published: July 2006

Abstract
Stopped-flow method has been used to investigate the kinetics of the solubilization of Acridine Orange (AO, 3,6-bis(dimethylamino)acridinium chloride) and its 10-alkyl derivatives into the micelle of sodium dodecyl sulfate (SDS). The reaction curves of the SDS–AO and SDS–10-alkyl AO systems were characterized by single and double exponential functions, respectively. It was found that all the time constants are concentration dependent and approach limiting values at high reactant concentrations. The data were fitted by a minimal mechanism in which a rapid bimolecular step is followed by one (AO) or two (10-alkyl derivatives of AO) sequential isomerizations. All the rate constants determined for this mechanism markedly decrease with an increase in the length of the introduced alkyl chain. The equilibrium constants for the bimolecular and first isomerization steps do not highly depend on the size of the alkyl chain, while the equilibrium constant for the second isomerization step progressively increases with increasing it. The spectral changes with time indicate that the bound dye gradually migrates to more hydrophobic environment inside the micelle. These results lead to the conclusion that the steps in the proposed mechanism correspond to rapid adsorption of the dye to the micelle surface site, followed by reorientation of the dye and then migration of its alkyl chain into the hydrophobic region of the micelle.
Solvent Extraction of the Hexaaquarhodium(III) Ion from Halogenated Carboxylate Solutions with Trioctylphosphine Oxide
Authors: Imura Hisanori , Takahashi Hiromi , Suzuki Nobuo 
Published: July 2006

Abstract
The extraction equilibrium of the inert hexaaquarhodium(III) ion has been studied. Rhodium(III) was quantitatively and rapidly extracted from 0.10 mol dm−3 trichloroacetate (TCA) or 0.010 mol dm−3 pentadecafluorooctanoate solutions to heptane containing 0.10 mol dm−3 trioctylphosphine oxide (TOPO) at pH 3–5. The extraction equilibria were achieved within 1 min at 298 K. From the equilibrium study in the TCA-TOPO system, the rhodium(III) species extracted into heptane was found to be Rh·3TCA·4TOPO, and the extraction constant was 1012.29. The rhodium(III) species in the organic phase was suggested to be the hexa-aquarhodium(III) complex associated with TCA and TOPO.
NMR Spectra of Organogermanium Compounds. X. Syntheses, 13C and 73Ge NMR Spectra and Molecular Mechanics Calculations of Germacyclopentanes and Germacyclopentenes
Authors: Takeuchi Yoshito , Tanaka Katsumi , Harazono Toshie 
Published: July 2006

Abstract
Germacyclopentane, its 1-methyl, and 1,1-dimethyl derivatives together with some germacyclopentenes were prepared and their 13C and 73Ge NMR spectra were determined. Molecular mechanics calculations of germacyclopentanes indicate that the symmetric twist form is the most stable in contrast to cyclopentane where the envelop and twist forms have much the same energy. Though both 13C and 73Ge chemical shifts are less sensitive to the stereochemistry of the methyl group as compared with the corresponding germacyclohexanes, the spectroscopic results can be explained in terms of the structures as depicted by molecular mechanics calculations.
Flash Photolysis Study for Halogen Abstraction of and Ph3Sn· and Ph3Si· from Alkyl Halides
Authors: Ito Osamu , Hoteiya Kiyohiko , Watanabe Akira , Matsuda Minoru 
Published: July 2006

Abstract
The reaction rate constants for halogen abstraction of Ph3Sn· and Ph3Si· have been determined by xenon-flash photolysis method. The absolute rate constants for the reactivity of Ph3Sn· with several alkyl halides have been compared with the relative ones; the agreement between the both methods was fairly good. For Ph3Sn·, the rate constant (in unit of mol−1 dm3 s−1) of n-BuCl (5.2×102) was smaller than that of n-BuBr (3.1×106) by a factor of ca. 1⁄104. With changing the alkyl halides, the rate constants for Ph3Si· and Ph3Sn· varied similarly, although the rate constants for Ph3Si· were larger than those for Ph3Sn· by factors of 50–100. The reactivity of alkyl halides increased with a decrease in the bond-dissociation energy of the R–X (X=Cl, Br).
THE SYNTHESIS AND CONFIGURATION OF FUKIIC ACID DERIVATIVES
Authors: Matsumoto Takashi , Hidaka Kazuo , Nakayama Teruko , Fukui Kenji 
Published: July 2006

Abstract
Fukiic acid derivatives have been synthesized from 3,4-dimethoxyphenylpyruvic acid by a stereospecific method. The synthetic methyl (+)-erythro-2,3-dihydroxy-4-(3,4-climethoxyphenyl)-3-methoxycarbonylbutyrate was shown to be identical with natural O,O′-dimethylfukiic acid dimethyl ester by a direct comparison.
THIOPYRYLIUM ION AS AN ELECTRON ACCEPTOR IN CHARGE-TRANSFER COMPLEX FORMATION
Authors: Yoshida Zen-ichi , Yoneda Shigeo , Sugimoto Toyonari 
Published: July 2006

Abstract
Thiopyrylium ion (I) has been found to form the CT complex having two CT absorption bands with olefin. Appearance of the two CT bands is rationalized by the existence of two closely located vacant orbitals of I.
ON THE PHOTOLYSIS OF ETHANE AND ITS DERIVATIVES ADSORBED ON ALUMINA
Authors: Fujieda Shigeaki , Setaka Morio , Kwan Takao 
Published: July 2006

Abstract
The photolysis of ethane adsorbed on alumina gave rise to an ESR spectrum consisted of ten hyperfine lines instead of twelve. It was suggested that S–\dotCHCH3 radicals are formed and that the methyl group can not rotate freely around the C–C axis.
SINGLET-TRIPLET EQUILIBRIUM IN TRIS(DIPIVALOYLMETHANATO) EURO PIUM(III) AS EVIDENCED BY PROTON MAGNETIC RESONANCE
Authors: Sakaguchi Ushio , Kunugi Masayuki , Fukumi Toshio , Tadokoro Shin’ichi , Yamasaki Akira , Fujiwara Shizuo 
Published: July 2006

Abstract
Temperature dependence was measured of the proton chemical shift of the shift reagent Eu(DPM)3. The shift deviates from the McConnell–Robertson equation below 200°K. This behavior was explained in terms of the low-lying first excited triplet 7F1 state.
HYDROXYLATION OF ANISOLES BY PHOTOOXYGENATION IN THE PRESENCE OF LEWIS ACIDS
Authors: Nagamachi Tamoaki , Niskcnaga Akira , Matsuura Teruo 
Published: July 2006

Abstract
Irradiation of anisoles in the presence of oxygen and a Lewis acid gave hydroxyanisoles where BF3 caused only ortho-hydroxylation and AlCl3 did ortho- and para-hydroxylation.
THE STRUCTURES OF EREMOFUKINONE, 9-ACETOXYFUKINANOLIDE AND S-JAPONIN FROM PETASITES JAPONICUS MAXIM
Authors: Naya Keizo , Kawai Masao , Naito Masami , Kasai Tsuneo 
Published: July 2006

Abstract
This paper deals with the structural determination of three new sesquiterpenes, eremofukinone (I), 9-acetoxyfukinanolide (II) and S-japonin (III), which were isolated from Petasites japonicus Maxim.
THE CODIMERIZATION OF PROPYLENE WITH ETHYLENE OVER NIO–WO3–Al2O3
Authors: Echigoya Etsuro , Kobayashi Atsuo 
Published: July 2006

Abstract
The codimerization of propylene with ethylene on various solid catalysts was investigated and the results compared with the dimerization reaction of ethylene and propylene. NiO–WO3–Al2O3 catalyst was found to be most active for codimerization. Besides dimerization reactions, isomerization was also observed on these catalysts.
INSERTION OF ETHOXYCARBONYLNITRENE INTO C–H BONDS OF CYCLIC ETHERS
Authors: Shingaki Tadao , Inagaki Masao , Torimoto Noboru , Takebayashi Matsuji 
Published: July 2006

Abstract
Ethyl azidoformate was photolyzed in three to six membered cyclic ethers. The α-C–H and α-methyl C–H bonds of cyclic ethers were observed to have unusually large reactivities compared with those of the corresponding C–H bonds of hydrocarbons in the insertion of ethoxycarbonylnitrene. On the anomalous reactivities, a mechanism has been advanced in which an O–N ylide is included as an intermediate of the insertion reaction.
AN X-RAY STUDY OF CRYSTALLINE-STATE PHOTO-POLYMERIZATION OF 1,4-BIS-(β-PYRIDYL-(2)-VINYL)-BENZENE
Authors: Nakanishi Hachiro , Ueno Katsuhiko , Hasegawa Masaki , Sasada Yoshio 
Published: July 2006

Abstract
The crystal and molecular structure of l,4-bis-(β-pyridyl-(2)-vinyl)-benzene (C20H16N2) was determined. Change of crystal structure on polymerization was investigated by X-ray diffraction method. The polymer obtained is three-dimensionally oriented and the molecular arrangement in the original crystal is preserved in the resultant crystal.
STUDY OF CHEMILUMINESCENCE BY MEANS OF CROSSED BEAMS: NITRIC OXIDE-OXYGEN ATOM SYSTEM
Authors: Ibaraki Takamasa , Kusunoki Isao , Kodera Kumasaburo 
Published: July 2006

Abstract
NO–O chemiluminescence was studied by means of crossed molecular beams. Anomalously bright light emissions have been observed with low temperature NO beams. It is considered that the chemiluminescence is caused by the two-body collisions between NO dimers and O atoms. Radiation cross section is estimated to be about 2×10−15 cm2.
NITRATION OF TOLUENE WITH NITRIC ACID IN THE PRESENCE OF AROMATIC SULFONIC ACIDS SUPPORTED ON THE POROUS MATERIALS
Authors: Kameo Takashi , Manabe Osamu 
Published: July 2006

Abstract
It was found that nitration of toluene with nitric acid catalyzed by aromatic sulfonic acids supported on the porous materials gave mononitrotoluene of the high para-isomer content. Thus, nitration catalyzed by toluene-2,4-disulfonic acid supported on Celite-545 gave higher para:ortho ratio (1.60) than that of mixed acid nitration (0.6).
THE CRYSTAL STRUCTURE OF 3,3′-DIETHYL-THIACYANINE BROMIDE
Authors: Nakatsu Kazumi , Yoshioka Hiroshi , Aoki Takao 
Published: July 2006

Abstract
The crystal structure of the title compound was determined by X-ray analysis. The dye ion has approximately Cs symmetry. The short S…S distance(2.994 Å) implies a strong interaction between them. The cations are stacked on top of each other along the c-axis with the separation of about 3.5 Å.
δ-CUPARENOL, A NEW SESQUITERPENE PHENOL FROM THE LIVERWORT, BAZZANIA POMPEANA
Authors: Matsuo Akihiko , Nakayama Mitsuru , Hayashi Shûichi 
Published: July 2006

Abstract
During the course of the investigation on the chemical constituents of the liverwort, Bazzania pompeana, a new sesquiterpene phenol, δ-cuparenol, was isolated as a minor component. The evidence for the proposed structure (I) is described.
THE KINETICS OF QUATERNIZATION OF N,N,N′,N′-TETRAMETHYL-α,ω-ALKANEDIAMINES WITH BUTYL BROMIDE
Authors: Murai Koichi , Kimura Chikai 
Published: July 2006

Abstract
Competitive and consecutive reaction of N,N,N′,N′-tetramethyl-α,ω-alkanediamines with butyl bromide was studied in propylene carbonate at different temperatures. The kinetic data have revealed the effects of the chain lengths of alkanediamines on the reaction.