bluuebunny/crossref_metadata_2025_split huggingface dataset:
Synthesis and Tautomerism of 1,5-Bis(alkylamino)-4H-benzo[a]phenothiazin-4-ones
Authors: Hasegawa Kan-ichi , Sakakibara Makoto , Ishida Tetsuya , Ueno Yoshio 
Published: July 2006

Abstract
The equimolecular condensation of 2-aminobenzenethiol (1) with 4,8-bis(alkylamino)-1,5-naphthoquinones (2) in ethanol in the presence of HCl gave near-infrared-absorbing 1,5-bis(alkylamino)-4H-benzo[a]phenothiazin-4-ones (3), which existed as predominant tautomers in various solvents. The reaction mechanism was proposed to involve pathways through the O-protonation of 2, followed by the attack of 1 on the resulting ion, the subsequent oxidation, and the acid-catalyzed intramolecular cyclization of the quinonoid intermediate. The tautomeric equilibria of 2, 3, and 5,8-dihydroxy-1,4-naphthoquinone favor the formation of an interconverting hydrogen atom of a higher electron density. The solvatochromic effect of 3 was analyzed by means of the linear solvation energy relationships.
Aromatic Skeletal Structures in Distillable Coal-Derived Liquids
Authors: Sugimoto Yoshikazu , Miki Yasuo , Oba Masaaki , Yamadaya Shoko 
Published: July 2006

Abstract
Aromatic constitutents in Wandoan coal-derived distillate were analyzed by means of capillary gas chromatography/mass spectrometry (GC/MS) in order to clarify their aromatic skeletal structures. The major aromatic skeletons could be classified into several groups, the molecular weights of which were represented by 78+50n, 118+50n, 154+50n, 166+50n, 202+50n, 242+50n (n=0,1,2,···), and so on. The increase by 50 corresponded to an additional benzene ring fused to the original skeleton. Some new types of aromatic skeletons, such as dihydrophenalene and benzindan, were found to be present in significant amounts.
Ion Pair Extraction and Separation Studies of Palladium
Authors: Sundaramurthi N M , Shinde V M 
Published: July 2006

Abstract
A simple and rapid method is proposed for the extraction, separation, and spectrophotometric determination of palladium from salicylate media using Aliquat 336 dissolved in xylene as an extractant. The optimum conditions were evaluated from a critical study of pH, salicylate concentration, Aliquat 336 concentration, and period of equilibration. The palladium in the Aliquat 336 phase is determined spectrophotometrically with 4-(2-pyridylazo)resorcinol (PAR) at 530 nm. The proposed method described the scheme for the separation of platinum, nickel, copper, cobalt, zinc, and manganese from binary mixtures. The method was extended to the analysis of palladium catalyst and platinum ores.
Tin(IV) Antimonate as a Lead-Selective Cation Exchanger: Synthesis, Characterization, and Analytical Applications
Authors: Varshney K G , Gupta Upma 
Published: July 2006

Abstract
A new phase of a lead-selective cation exchange material, tin(IV) antimonate has been prepared, which possesses a good column exchange capacity (2.4 mequiv g−1). Its characterization has been done on the basis of its ion-exchange characteristics and some instrumental studies such as TGA, IR, and X-ray diffraction. The utility of the material has been demonstrated by achieving some binary separations of metal ions on its column, such as Al(III)–Pb(II), Mg(II)–Pb(II), Fe(III)–Pb(II), Al(III)–Fe(III), Mg(II)–Al(III), and Mg(II)–Fe(III). Maximum limits of the column’s loading capacity have also been evaluated for all metal ions.
New Ferroelectric Liquid Crystal Materials: (+)-4-(5-Alkyl-1,3-dioxan-2-yl)phenyl 4-(2-Methylbutoxy)benzoates
Authors: Haramoto Yuichiro , Kamogawa Hiroyoshi 
Published: July 2006

Abstract
(+)-4-(5-Alkyl-1,3-dioxan-2-yl)phenyl 4-(2-methylbutoxy)benzoates (9) and their oxathiane (10) and dithiane (11) analogs have been synthesized. The mesomorphic behavior of these compounds was measured. Compounds 9 exhibited a ferroelectric liquid-crystal behavior (e.g. R=n-C10H21: 51 SmC* 57.5°C), while the corresponding 1,3-oxathianes (10) and 1,3-dithianes did not.
NMR Studies on the Rotational Motion of Coordinated D2O Molecules in MBr (M=Li+, Na+, K+, Cs+) Dilute Aqueous Solutions
Authors: Shimizu Akio , Taniguchi Yoshihiro 
Published: July 2006

Abstract
The parallel (D,τ⁄⁄) and perpendicular (17O,τ⊥) rotational correlation times of coordinated D2O molecules in MBR (M=Li+, Na+, K+, Cs+ aqueous solutions in the concentration range of 0.2 to 1.0 molkg−1 at 25 °C were determined by NMR. The spin-lattice relaxation rates (R1) varied linearly with increase in concentration up to 1.0 molkg−1. The ratios (τ⁄⁄/τ⊥) of the rotational correlation times of coordinated D2O molecules in Li+, Na+, K+, and Cs+ ions were 1.12, 1.13, 0.89, and 0.92, respectively. These results indicate that for coordinated D2O molecules in Li+ and Na+ ions, the perpendicular rotational motion is 10% faster than the parallel one. On the other hand, for coordinated D2O molecules in K+ and Cs+ ions, the tendency was reversed. These results are explained in terms of both the Eulerian angle β between the diffusion tensors with the molecular plane and the intermolecular interactions between the ions and D2O molecules.
Reaction of [CoL2]· 2H2O, [Co(NO)L2], or [Co(NO)L2(py)] (L=8-Quinolinolate Ion; py=Pyridine) with Nitrogen Monoxide: Disproportionation of Nitrogen Monoxide Induced by Cobalt Complexes
Authors: Maejima Toshiaki , Miki Eiichi , Tanaka Mikio , Tezuka Hirobumi , Mizumachi Kunihiko , Ishimori Tatsujiro 
Published: July 2006

Abstract
[Co(qn)2]· 2H2O (1) (qn=8-quinolinolate ion) and [Co(NO)(qn)2] (2) reacted with NO in 10 vol% pyridine–DMF or pyridine to give the nitrato complex, [Co(NO3)(qn)2L] (L=pyridine or DMF), with liberation of N2O. [Co(NO)(qn)2(py)] (py=pyridine) having NO− group (3) reacted with NO in CH2Cl2, the py–DMF, or pyridine to give [Co(qn)2(NO3)(py)] with liberation of N2O. The mass analyses of the residual NO for the reaction of 2 or 3 with NO in the pyridine medium and for the reaction of 3 with NO in CH2Cl2, using the nitrogen-15 labelled compounds showed that a perfect nitrogen scramble occurred between the NO gas and the NO group of 2 or 3. In the reaction of 2 with NO in CH2Cl2, ca. 80% of the coordinating NO reacted with NO gas accompanying a rupture of the original Co–NO bond. The present results were compared with those obtained in the cases that 2-methyl-, 4-methyl-, 5-chloro-, and 5-nitro-8-quinolinolate ions were used as ligands. The electronic effects caused by the substituent of the quinoline ring and by the solvents on the reactions were discussed.
Synthetic Photochemistry. LIV. The Photoaddition Reaction of Methyl 2,4-Dioxopentanoate with 2,5-Dimethyl-2,4-hexadiene, a Sterically Crowded Conjugated Diene
Authors: Hatsui Toshihide , Nojima Chitoshi , Takeshita Hitoshi 
Published: July 2006

Abstract
The photoaddition reaction of methyl 2,4-dioxopentanoate with 2,5-dimethyl-2,4-haxadiene gave a normal [2+2]adduct in only a small amount, but three isomeric dihydropyrans (4–6), two oxetanes (7 and 8), and five isomeric hydroxy keto esters (9–13). The mechanism and regioselectivity were discussed.
The Preparation of Crown Ethers Containing Dicinnamoyl Groups and Their Complexing Abilities
Authors: Akabori Sadatoshi , Tsuchiya Shigemi 
Published: July 2006

Abstract
The reaction of 1, 10-bis[p-[2-(chloroformyl)vinyl]phenyl]-1,4,7,10-tetraoxadecane with the dipotassium salt of catechol in the presence of a catalytic amount of 18-crown-6 in benzene gave 5,6-benzo-4,7,17,20,23,29-hexaoxa[10.10]paracyclopha-1,5,9-triene-3,8-dione (10a) in 3.6% yield. Also, 24,25-benzo-1,4,7,10,13,23,26-heptaoxa[13.10]paracyclopha-20,24,28-triene-22,27-dione (10b) and 27,28-benzo-1,4,7,10,13,16,26,29-octaoxa[16.10]paracyclopha-23,27,31-triene-25,30-dione (10c) were obtained by the same method in 3.1 and 3.0% yields, respectively. Irradiation of the acetonitrile solutions of the crown ethers, 10a, 10b and 10c, by Pyrex-filtered UV light (&gt;300 nm) gave the corresponding intramolecular [2+2]photocycloadducts, 11a, 11b and 11c, in 95.8, 93.2 and 90.1% yields, respectively. The structures of 11a, 11b and 11c were confirmed to be the β-form by their 1H NMR spectra. The photoreversible cleavage of 11a, 11b and 11c by 220 nm UV light gave the corresponding starting crown ethers, 10a, 10b and 10c, in 30, 40 and 61% yields, together with their geometrical isomers in 30, 50 and 27% yields, respectively. Compound 10c showed selective extraction abilities for K+ and Rb+ cations compared with 11c.
Salt Effects on Equilibrium and Kinetics of the Reaction of Tetrakis(1-methyl-4-pyridinio)porphine with DNA
Authors: Sugimoto Naoki , Hasegawa Keiko , Sasaki Muneo 
Published: July 2006

Abstract
The association reaction of tetrakis(1-methyl-4-pyridinio)porphine (TMpyP) with salmon testes DNA has been investigated spectrophotometrically, statically, and kinetically in buffers containing different concentrations of Na+. Free TMpyP had an absorption maximum at 424 nm, which decreased with increasing DNA concentration. At the low Na+ concentrations of less than 1.20×10−1 mol dm−3 the minimal absorbance at the wavelength was reached by less than 1×104 mol dm−3 DNA. On the other hand, near the end of the titration at the high DNA concentrations at 2.20×101 mol dm−3 Na+, the absorbance no longer continued to decrease but displayed a small absorbance increase. The dependence of the association constant on the Na+ concentration indicated that less than one ion-pair contributed to a formation of the complex between TMpyP and DNA if there was the same reaction mechanism at the Na+ concentration range used in the experiment. These results of the spectra and the association constants suggested that a mechanism of the reaction might be different at the low and high salt concentrations. Kinetic results by a micro stopped-flow method showed that the reaction was a single step at the low Na+ concentration, while at the high Na+ concentration it consisted of two steps.
The Reaction of Wittig Reagents with Selenium. Formation of Selenoaldehydes
Authors: Okuma Kentaro , Komiya Yasuo , Kaneko Isao , Tachibana Yuji , Iwata Eiji , Ohta Hiroshi 
Published: July 2006

Abstract
The reaction of Wittig reagents with elemental selenium gave the corresponding selenoaldehydes which further reacted with other Wittig reagents to give the corresponding dimeric olefins in good yields. The selenoaldehydes formed afforded corresponding adducts by the reaction with dienes. These selenoaldehydes obtained by retro Diels–Alder reaction were also found to react with Wittig reagents to give the corresponding olefins in good yields.
Stereochemical Control in Microbial Reduction. XV. Preparation of (2R,3S)-2-Allyl-3-hydroxybutanoate
Authors: Nakamura Kaoru , Miyai Takehiko , Fukushima Kohichi , Kawai Yasushi , Babu B Ramesh , Ohno Atsuyoshi 
Published: July 2006

Abstract
The reduction of ethyl 2-allyl-3-oxobutanoate mediated by Mucor javanicus affords the corresponding (2R,3S)-syn-hydroxy ester. The stereoselectivity is excellent and complementary to the reduction mediated by bakers′ yeast where the (2S,3S)-anti-hydroxy ester is obtained.
Inverse Phase-Transfer Catalysis by Cyclodextrins. Palladium-Catalyzed Reduction of Bromoanisoles with Sodium Formate
Authors: Shimizu Shoichi , Sasaki Yasuyuki , Hirai Choichiro 
Published: July 2006

Abstract
Bromoanisoles have been reduced to hydrocarbons with sodium formate in high yields under mild conditions using palladium on charcoal and cyclodextrins as catalysts. In aqueous phase-organic phase reactions employing a solid-phase catalyst (Pd/C), cyclodextrins function as inverse phase-transfer catalysts which transfer the substrate into the aqueous phase.
The Behavior of Mixing in Liquid Binary Alloys. Enthalpies of Mixing in the Systems Lead–Tin, Lead–Antimony, Lead–Bismuth, and Lead–Thallium
Authors: Badawi Walid , El-Talbi Mohamed , Oun Ahmed M 
Published: July 2006

Abstract
The paper presents values of the enthalpy of mixing in the liquid systems Sn–Sb, Pb–Bi, and Tl–Pb. The enthalpy of mixing in the system Sn–Sb is positive with a maximum of about 1.4 kJ mol−1. The enthalpies of mixing in the systems Pb–Sb, Pb–Bi, and Tl–Pb are slight negative (−0.07 to −1) kJ ml−1. The enthalpy of mixing and the ξ-function in the above given systems rule for liquid systems of B-metals.
Facile Pyrolytic Preparation of cis-Dioxoporphyrinatomolybdenum(VI) from trans-Diperoxoporphyrinatomolybdenum(VI)
Authors: Sugaya Hiroyuki , Imamura Taira 
Published: July 2006

Abstract
cis-Dioxo (tetraphenylporphyrinato)molybdenum(VI) [MoVI(O)2(tpp)] (tpp=5,10,15,20-tetraphenylporphyrinato) is easily prepared by the pyrolysis of the corresponding diperoxoporphyrinato complex [MoVI(O2)2(tpp)] releasing dioxygen gas at 200 °C under 10−3–10−4 Torr (1 Torr≈133.3 Pa).
Synthesis and Magnetic Property of Binuclear Oxovanadium(IV) Complex of 2,6-Diformyl-4-methylphenol Bis(benzoylhydrazone)
Authors: Sakamoto Masatomi , Itose Shoichi , Ishimori Tomitaro , Matsumoto Naohide , Okawa Hisashi , Kida Sigeo 
Published: July 2006

Abstract
Binuclear oxovanadium(IV) complex, [(VO)2L(OCH3)], has been synthesized, where H3L denotes 2,6-diformyl-4-methylphenol bis(benzoylhydrazone). Two metal ions are bridged by the phenolic oxygen of L3 and a methoxide oxygen. Cryomagnetic measurements (80–300 K) indicated the operation of an antiferromagnetic spin-exchange interaction (J=−191.3 cm−1) between the oxovanadium(IV) ions.
Diastereoselective Catalytic Hydrogenation of Nα-Pyruvoyl-(S)-prolinamide
Authors: Munegumi Toratane , Maruyama Tetsuya , Takasaki Michiaki , Harada Kaoru 
Published: July 2006

Abstract
Catalytic hydrogenation of Nα-pyruvoyl-(S)-prolinamide over palladium on charcoal in several solvents resulted in the formation of Nα-[(S)-lactoyl]-(S)-prolinamide in good d.e. up to 77%. Usefulness of N-isopropyl-(S)-prolinamide as an asymmetric moiety is described in the catalytic hydrogenation.
Piezochromism of Acridinols
Authors: Matsui Masaki , Shibata Katsuyoshi , Muramatsu Hiroshige 
Published: July 2006

Abstract
Piezochromic properties of acridinols and phenazinols have been examined. Only 3-acridinols showed piezochromism. This phenomenon was found to correspond to the formation of lactam isomers of the hydroxy compounds in 20 % aqueous solution of ethanol.
Terminal–Terminal Types of Liquid Crystals. I. Synthesis and Electrooptical Properties of a Ferroelectric Liquid Crystal
Authors: Shiraishi Kohei , Kato Koichi , Sugiyama Kazuo 
Published: July 2006

Abstract
A novel ferroelectric liquid crystal, (S)-bis(2-methylbutyl) 3,3′-[1,2-ethanediylbis[oxy-4,1-phenylenemethylidyne nitrilo-4,1-phenylene]]bis[2-propenoate] (EBOPBP) was prepared, which are composed of two chiral mesogenic groups interconnected by a very short flexible spacer chain. EBOPBP exhibts a chiral smectic C phase (Sc*). From an electrooptical effect due to a deformation of helical structure in the Sc* state, the rise time (τr) was estimated to be 240 μs at 180 °C.
Structure Analysis of Metal(I) Halides Mixed Crystal by 63Cu MAS NMR and X-Ray Diffraction Methods. I. CuxAg1−xI Crystal
Authors: Endo Kazunaka , Fujito Teruaki 
Published: July 2006

Abstract
63Cu MAS NMR and X-ray diffraction methods have been used to perform a structure analysis of mixed crystals, CuxAg1−xI. The mixed crystals were prepared and analyzed as a complete solid-solution and a core-shell type of crystal by the X-ray diffraction method. 63Cu signals in the complete solid-solution shifted with broadening to a high field around 14–33 ppm relative to solid CuI, as the silver/copper ratio increased. The line width of the signal was 2-to 2.5-times as broad as that for solid CuI. On the othe hand, the signal in a core-shell type of crystal did not shift much and the line width was much the same as that for CuI. The shifts and broad line widths in the complete solid-solution can be explained by considering components which involve the second-order quadrupolar coupling tensors. The quadrupolar coupling tensors are seen to be caused by changing from Td of –(CuI4)–spcies to its C3v and C2v symmetries due to replacing Cu with Ag in the crystal.
The Effect of Very High Magnetic Fields on Cyclic Voltammetry
Authors: Mogi Iwao , Kido Giyuu , Nakagawa Yasuaki 
Published: July 2006

Abstract
The cyclic voltammetry of ferrocene and p-benzoquinone in N,N-dimethylformamide and acetonitrile was inverstigated under very high magnetic fields up to 140 kOe (1 kOe=(1⁄4π)×103 A m−1). Plateaus of limiting currents were observed on cyclic voltammograms, and the limiting currents were remarkably enhanced by magnetic fields. These results were explained as the enhancement of mass transfer, which is caused by a magnetohydrodynamic convection. This effect was found to be pronounced at the slow potential scan rate of 10 mV s−1 in a low viscosity solvent like acetonitrile, where the current is controlled by not only mass transfer but also the electron transfer rate. The current enhancement was also observed in anodic stripping on the cyclic voltammogram of Cu2+ above 100 kOe.
Stereocontrolled Addition Reaction of Organometallics to Chiral α-Keto Amides
Authors: Fujisawa Tamotsu , Ukaji Yutaka , Funabora Makoto , Yamashita Mikio , Sato Toshio 
Published: July 2006

Abstract
Complementary stereoselection in the addition reaction of several organometallics to chiral benzoylformamide, prepared from benzoylformic acid and (S)-2-(methoxymethyl)pyrrolidine, could be achieved using magnesium- and titanium-based reagents to give differeent diastereomers of atrolactamide. On the other hand, the reaction of phenyl metallics to the corresponding pyruvamide afforded (S)-atrolactamide.
Channel Forming Activity of an Anionic Amphiphilic Sequential Polypeptide in a Cationic Bilayer Membrane
Authors: Higuchi Masahiro , Kinoshita Takatoshi , Takizawa Akira , Tsujita Yoshiharu , Okochi Kiyomi 
Published: July 2006

Abstract
A channel forming activity of hydrophobic polypeptide, hydrophobic and anionic random copolypeptide, and anionic amphiphilic sequential copolypeptide, respectively, was investigated in a cationic bilayer membrane composed of dimethyldioctadecylammonium chloride (DOACl), and correlated with their location in the membrane estimated by fluorescence spectroscopic and microscopic measurements. A pure hydrophobic polypeptide, poly(γ-methyl l-glutamate) (PMG), was incorporated into DOACl bilayer membrane resulting from their hydrophobic interaction. The incorporation, however, allowed PMG to exhibit very little channel forming activity for sodium ion. A hydrophobic and anionic random copolypeptide, composed of γ-methyl l-glutamate and l-glutamic acid containing 30 mol% of l-glutamic acid (70/30 MG/GA) could hardly penetrate the bilayer membrane and was almost localized at the cationic membrane surface because of Coulombic interaction. 70/30 MG/GA did not effectively control the sodium ion permeability through the membrane. On the other hand, an anionic amphiphilic sequential polypeptide composed of γ-methyl l-glutamate and l-glutamic acid (am. -MG/GA) was incorporated into the cationic DOACl membrane to form the transmembrane bundle ca. 40 Å in diameter. This transmembrane bundle consisting of am. -MG/GA acted as a channel for sodium ion. However, lithium ion having larger hydration size than sodium ion could not penetrate through the channel.
Asymmetric Synthesis of Fluorophenylalanines and (Trifluoromethyl)phenylalanines; the Use of Chiral Pyridoxamine-Like Pyridinophane-Zinc Complex as an Enzyme Mimic
Authors: Ando Makoto , Kuzuhara Hiroyoshi 
Published: July 2006

Abstract
Transamination reactions in the presence of zinc(II) ion between (R)- or (S)-15-aminomethyl-14-hydroxy-5,5-dimethyl-2,8-dithia[9](2,5)pyridinophane, pyridoxamine analog with planar chirality, and o-, m-, and p-fluorophenylpyruvic acids or o-, m-, and p-(trifluoromethyl)phenylpyruvic acids gave the corresponding fluorophenylalanines or (trifluoromethyl)phenylalanines with 33–66% enantiomeric excess in moderate yields. The observed rate constants of these transaminations, kobsd, were determined with a concomitant observation of of a linear relationship between logkobsd and Hammett’s constant, σ0.
A Novel Formation of Phenyl-Substituted Pyridines by the Reaction of N-(Diphenylphosphinyl)-1-azaallyl Anions with α,β-Unsaturated Carbonyl Compounds. A New Synthetic Equivalent of Primary Vinylamines
Authors: Kobayashi Tomoshige , Kawate Hiroshi , Kakiuchi Hidetaka , Kato Hiroshi 
Published: July 2006

Abstract
The N-phosphinyl-1-azaallyl anions, which were derived from the corresponding imine or enamine, reacted with α,β-unsaturated carbonyl compounds to afford phenyl-substituted pyridines along with 1-propanone and 1,5-pentanedione derivatives. A plausible mechanism involving a sequence of Michael addition and intramolecular aza-Horner-Wittig reaction is described, and the 1-azaallyl anions were found to behave as a synthetic equivalent of primary vinylamines.
Carbometallation of 1,4-Bis(trimethylsilyl)butadiyne with Trimethylaluminium Using a Bis(cyclopentadienyl)metal Dichloride Catalyst
Authors: Kusumoto Tetsuo , Nishide Kiyoharu , Hiyama Tamejiro 
Published: July 2006

Abstract
Carbometallation of 1,4-bis(trimethylsilyl)-1,3-butadiyne with trimethylaluminium in the presence of a bis(cyclopentadienyl)zirconium dichloride or bis(cyclopentadienyl)titanium dichloride catalyst afforded (E)-2-methyl-1,4-bis(trimethylsilyl)-1-buten-3-yne selectively after aqueous workup. Treatment of the intermediate organoaluminium compound with an electrophile like D2O, N-bromosuccinimide, N-chlorosuccinimide, or acetyl chloride gave the same hydrocarbon possessing D, Br, Cl, or CH3CO at C-1. The reaction using a bis(cyclopentadienyl)vanadium dichloride catalyst gave rise to (Z)-1,2-dimethyl-1,4-bis(trimethylsilyl)-1-buten-3-yne in a single step.
Synthesis of Binuclear Palladium(I) and (II) Complexes Containing (Benzylthiomethyl)diphenylphosphine as Bridging Ligand. The X-Ray Crystal Structure and Reactions of [Pd2Cl2(μ-PhCH2SCH2PPh2)2]
Authors: Fuchita Yoshio , Hardcastle Kenneth I , Hiraki Katsuma , Kawatani Masanori 
Published: July 2006

Abstract
The side-by-side type palladium(I) complex [Pd2Cl2(μ-btmp)2] (2) was synthesized either by the reaction among [PdCl2(NCMe)2], [Pd(dba)2] (dba=dibenzylideneacetone), and (benzylthiomethyl)diphenylphosphine (btmp) or by the reaction of [PdCl2(btmp-P)2] (1) and [Pd(dba)2]. The structure of 2 was established by a single-crystal X-ray diffraction study; the crystals were monoclinic, space group P21/c, with a=13.537(3), b=19.550(3), c=17.240(4) Å, β=114.59(2)°, and Z=4; final R factor 0.049 for 5490 observed reflections. The structure showed that there is a metal-metal bond [Pd–Pd 2.590(2) Å]. Treatment of 2 with sodium iodide afforded the diiodo complex [Pd2I2(μ-btmp)2], whereas that with 4-methylpyridine (4-MePy) in the presence of AgClO4 gave [Pd2(μ-btmp)2(4-MePy)2][ClO4]2. Moreover, 2 reacted with substituted acetylenes (RC≡CR′: R=Ph, R′=H; R=CO2Me, R′=H; R=R′=CO2Me) to yield A-frame type complexes [Pd2Cl2(μ-RC=CR′)(μ-btmp)2]. All the complexes obtained in this study were characterized by means of elemental analysis, and IR and NMR spectroscopy.
Synthetic Inorganic Ion-Exchange Materials. LVIII. Hydrothermal Synthesis of a New Layered Lithium Titanate and Its Alkali Ion Exchange
Authors: Sugita Mitsuru , Tsuji Masamichi , Abe Mitsuo 
Published: July 2006

Abstract
A new crystalline hydrous lithium titanate, (Li1.81, H0.19)Ti2O5·2.2H2O, was synthesized hydrothermally at 190 °C by a reaction of hydrous titanium dioxide with LiOH solution. The compound has a layered structure and showed a C–base-centered orthorhombic system with the lattice constants, ao=16.66±0.02 Å, bo=3.797±0.002 Å, and co=3.007±0.003 Å. The lattice constants were changed to ao=18.08±0.03 Å, bo=3.784±0.003 Å, and co=2.998±0.002 Å upon conversion to the hydrogen form. The 8.5% increase in the ao value along the a axis suggests a layered structure. A hypothetical structure was proposed. The H+ form showed the ion-exchange selectivity at an ionic strength of 0.1 in the order of K+&lt;Na+&lt;Li+ at pH&gt;6 and Li+&lt;K+&lt;Na+ at pH&lt;6.