bluuebunny/crossref_metadata_2025_split huggingface dataset:
Studies of the Cobalt(III) Complexes of 8-Amino-3,6-diazaoctanate Ion. V. Optical Resolutions and Circular Dichroism Spectra of 8-Amino-3,6-diazaoctanato(glycinato)cobalt(III) Perchlorates
Authors: Watanabe Kiyokatsu 
Published: July 2006

Abstract
Three optically active isomers, (+)589-, (−)589-cis(O)-, and (−)589-trans(O)-[Co(adao)(gly)]ClO4, where adao and gly stand for 8-amino-3,6-diazaoctanate and glycinate, have been obtained. The structures have been determined on the basis of the absorption, circular dichroism, and proton NMR spectra.
Halogenation of Mixed Ligand Cobalt(III) Complexes with 12- or 13-Membered Tetraaza Macrocycle and Acetylacetone, [Co[Z]aneN4(acac)](ClO4)2 (Z=12, 13)
Authors: Hirano Akira , Matsumoto Naohide , Ohyoshi Akira 
Published: July 2006

Abstract
The parent cobalt(III) complex [Co[12]aneN4(acac)](ClO4)2, [Co[12]aneN4(bzac)](ClO4)2, or [Co[13]aneN4(acac)](ClO4)2 reacts with N-halogenosuccinimide to give the substituted complex [Co[12]aneN4(Xacac)(ClO4)2, [Co[12]aneN4(Xbzac)](ClO4)2, or [Co[13]aneN4-(Xacac)](ClO4)2, where [12]aneN4=1,4,7,10-tetraazacyclododecane, [13]aneN4=1,4,7,10-tetraazacyclotridecane, acac=acetylacetonato, bzac=benzoylacetonato, X=Cl, Br.
The Laser-flash Photolysis of 2-Hexanone and 5-Methyl-2-hexane for the Direct Detection of the Triplet 1,4-Biradical
Authors: Naito Ikuo 
Published: July 2006

Abstract
In the laser-flash photolysis of 2-hexanone and 5-methyl-2-hexanone (265 nm, 15 ns pulse), triplet 1,4-biradicals were detected directly. The absorption spectrum exhibits absorption maxima at λ=250 nm and at λ=320 nm. The decay-rate constant of the 1,4-biradical increases as follows: in methanol &lt; in acetonitrile &lt; in hexane &lt; in dichloromethane [(2–4)×107 s−1 (2-hexanone), (3–6)×107 s−1 (5-methyl-2-hexanone)].
Synthesis of 3-(4-Piperidylidene)-1,3-dihydro-2H-indol-2-one Derivatives
Authors: Obase Hiroyuki , Nakamizo Nobuhiro , Takai Haruki , Teranishi Masayuki 
Published: July 2006

Abstract
3-[1-(2-Aryl-2-hydroxyethyl)-4-piperidylidene]-1,3-dihydro-2H-indol-2-one with structure II, as potential antihypertensive agent was synthesized. The intermediates, 3-[1-(2-aryl-2-oxoethyl)-4-piperidylidene]-1,3-dihydro-2H-indol-2-one (5) were prepared from 4-piperidone via 4 steps. Selective reduction of carbonyl group in 5 was realized using diisobutyl aluminium hydride to afford compound II.
Reaction of Some Compounds Having Both Endo and Exo Olefinic Bonds with 1,2,4-Triazoline-3,5-diones
Authors: Oshikawa Tatsuo , Yamashita Mitsuji 
Published: July 2006

Abstract
Reaction of piperitenone, (+)-limonene, or styrene with 1,2,4-triazoline-3,5-dione (TAD) produces adducts by ene reaction. The reaction of (+)-limonene gives a 2:1 adduct which results from further addition of TAD to an intermediary ene reaction product. The reaction of styrene gives 2:1 adducts via further addition of TAD to the Diels-Alder reaction product.
The η5-C9H11Fe(CO)2(isobutylene)+BF4− Complex as a Protecting Group of Carbon-Carbon Double Bonds
Authors: Ishii Yasutaka , Kagayama Takashi , Inada Akihiro , Ogawa Masaya 
Published: July 2006

Abstract
η5-C9H11Fe(CO)2(isobutylene)+BF4− (6), [Fpi(isobutylene)]+BF4−, was prepared and used as a protecting group of carbon–carbon double bonds. The complex 6 undergoes ligand exchange with a variety of diolefins to give Fpi(diolefin)+BF4− complexes, whose subsequent hydrogenations on Pd/C give olefins hydrogenated regioselectively.
Hydrocyanation of α,ω-Diynes Catalyzed by Tetracyanonickelate. Regiospecific Synthesis of a New Series of Acyclic Dinitriles
Authors: Funabiki Takuzo , Sato Yoshihiro , Yoshida Satohiro 
Published: July 2006

Abstract
Hydrocyanation of α,ω-diynes without the use of HCN has been described. Cyanonickelate, prepared by reducing [Ni(CN)4]2− with NaBH4 or Zn in the presence of excess KCN in water or ethylene glycol, catalyzes hydrocyanation of α,ω-diynes, HC≡C(CH2)nC≡CH to give quantitatively CH3CH(CN)(CH2)nCH(CN)CH3, a new series of acyclic dinitriles. Importance of the preliminary formation of a (π-acetylene)nickel(0) complex for the hydrocyanation has been suggested.
Synthesis of 2,9,23,30-Tetraoxa[2]paracyclo[2](1,1′)ferroceno[2]paracyclo[2](1,1′)ferrocenophane-1,10,22,31-tetraone
Authors: Kasahara Akira , Izumi Taeko , Saito Katsuo 
Published: July 2006

Abstract
Ferrocenophane, in which the two ferrocene rings are linked by ester bonds and p-substituted benzene rings, has been synthesized by the reaction of hydroquinone with 1,1′-bis(chloroformyl)ferrocene. The structure of the compound has been studied on the basis of the NMR and electronic spectra.
The Crystal and Molecular Structure of Echinosporin
Authors: Hirayama Noriaki , Iida Takao , Shirahata Kunikatsu , Ohashi Yuji , Sasada Yoshio 
Published: July 2006

Abstract
Echinosporin, 6-carbamoyl-1-hydroxy-3,5-dioxatricyclo[6.3.0.04,9]undeca-6,10-dien-2-one, is a novel antibiotic. The space group is P212121 with a=9.716(1), b=13.823(1), c=7.202(1) Å, and Z=4. The structure was solved by the direct method and refined to the R value of 0.049 by the block-diagonal least-squares method using 1239 reflexions. The molecule has a fused tricylo structure which consists of two six-membered rings and one five-membered ring.
Nitrite Substitution on cis-Tetraamminediaquacobalt(III) Ion in HNO2–NO2− Buffer Media
Authors: Ghosh Manik Chandra , Banerjee Pradyot 
Published: July 2006

Abstract
The anation of the title complex by NO2− was followed spectrophotometrically. The anation proceeds in two steps. A simple second-order rate law applies to each step. No evidence has been furnished for the formation of any nitrito intermeidates.
Ab Initio SCF-SDCI Prediction of Type II Spectra and Geometry of (ClHCl)− Hydrogen Bond Complex. I. One Dimensional Vibrational Analysis
Authors: Saitoh Toshikazu , Mori Kazuhide , Sasagane Kotoku , Itoh Reikichi 
Published: July 2006

Abstract
Ab initio SCF(self-consistent field)-SDCI(single and double configuration interaction) calculations are presented on HCl2−. Applied basis sets are 4-31G, 4-31G(**) (no 3d-polarization functions on Cl atoms and 2p-polarization functions on H atom), 4-31G** (addition of polarization functions both on Cl and H atoms) and the split basis by Dunning (Cl/12s9p)(H/4s)→[Cl/6s5p][H/2s] with the addition of diffuse functions and/or polarization functions. Vibrational and geometrical analyses are performed on the Cl–Cl potential surface under symmetry conservation, and then on the proton potential surface at optimized RCl–Cl position. After potential interpolation by the continuous quadratic functions which reconstruct the calculated potential values on all mesh points, the quantal vibrational analysis is perfomed by the Störmer-Levy difference method. Discussion is made on the experimental confusion about the assignment of type II spectra of HCl2− as v3 mode in an argon matrix by the selection of basis set and of CI matrix expansion. Whereas the calculations in a primitive size proposes the double minimum potential surface of proton and type II spectra in ≈700cm−1 region as v3 (which corresponds to the experimental data by Evans and Lo (1966) and Ault (1975)), the extended calculations (i.e. the large basis sets and the great number of CI matrix expansion) reduce the central barrier of the proton potential and then conclude the IR absorption in 1000–1100 cm−1 region as v3 in the type II spectra (which corresponds to the experimental results of CsCl·1/3 [H3O+HCl2−] by Schröder (1970) and Smith (1973)).
Demonstration of Electrostatic Field Effect Working on Dipolar Liquids with Correlation to Their Structures
Authors: Wada Goro , Teruta Yasuko , Kato Takako , Bitoh Naoko 
Published: July 2006

Abstract
When an electrically charged body is allowed to come close to a fine water stream falling down from the tip of a capillary, the vertical stream is bent a little to wards the charged body by an attractive force due to the electricity water dipole interaction. We constructed a simple equipment for the purpose of quantitative determination of the attractive force by defining a quantity P to search the correlation between the permittivity ε and the dipole momemt μ of polar liquids. For various pure polar liquids and mixtures at various mole fractions x of the components, we found a proportional correlationship P\barε=k\barμ with a common constant k, when the electric potential applied on an electrode, temperature, and flow velocity are fixed. In the cases of mixtures, \barε=∑x1ε1 and \barμ=∑x1μ1 are used. Pure liquids, such as methanol, ethanol, 1-propanol, acetic acid, acetone, acetonitrile, tetrahydrofuran, 1,4-dioxane, nitromethane, dimethyl sulfoxide, and nitrobenzene and mixtures, such as benzene–ethanol and benzene–nitrobenzene obey the proportionality rule approximately. On the other hand, water and some mixtures such as benzene–acetic acid and benzene–tetrahydrofran fail the rule, suggesting the possibility that molecular association occurs due to their mutual interactions in the liquids. Thus, this method may be considered as a simple demonstration illustrating the states of molecular aggregation in polar liquids.
The Synthesis of (+)-Premnolal
Authors: Matsumoto Takashi , Imai Sachihiko , Yuki Shuhei , Mitsuki Masanori , Miuchi Shigekazu , Sunaoka Yasuhiro 
Published: July 2006

Abstract
The revised structure of premnolal was confirmed by the following synthesis. Treatment of 12-methoxypodocarpa-8,11,13-triene (7), derived from methyl 12-methoxypodocarpa-8,11,13-trien-18-oate, with ethoxyoxalyl chloride and anhydrous aluminium chloride afforded 13-(ethoxyoxalyl) derivative, which was converted into 12-hydroxypodocarpa-8,11,13-triene-13-carbaldehyde (9) by alkaline hydrolysis, decarboxylation, and demethylation. The compound 9 was also prepared from 7 by demethylation and formylation. Reduction of 9 with lithium aluminium hydride, followed by partial acetylation, afforded 13-acetoxymethyl derivative which was converted into 13-acetoxymethyl-12-methoxy-11-nitropodocarpa-8,11,13-triene by nitration and methylation. This was then converted into 11,12-dimethoxypodocarpa-8,11,13-triene-13-carbaldehyde (18) by a series of reactions: catalytic hydrogenation, diazotization, reduction with lithium aluminium hydride, methylation, and oxidation. Demethylation of 18 gave 11,12-dihydroxypodocarpa-8,11,13-triene-13-carbaldehyde, which was identical with natural premnolal.
Acidic and Catalytic Properties of Niobium Pentaoxide
Authors: Iizuka Tokio , Ogasawara Kazuharu , Tanabe Kozo 
Published: July 2006

Abstract
The surface acidic property of Nb2O5·nH2O and its catalytic activities for the isomerization of 1-butene, the polymerization of propylene and the dehydration of 2-butanol were examined. The activities were high on Nb2O5·nH2O evacuated at moderate temperatures(100–150 °C) in all of the reactions and decreased drastically on evacuation at higher temperatures (400–500 °C). The surface of Nb2O5·nH2O showed a strong acidic character (H0≤−5.6) even after heating in air at 100 °C, but the strong acid sites disappeared on heat treatment at higher temperatures. The active sites on the catalysts heat-treated at moderate temperatures were ascribed mainly to Brönsted acid sites on the basis of the IR study of adsorbed pyridine.
The Preparation and Some Properties of Potassium Tris(1,1′-ferrocenedicarboxylato)ferrate(III)
Authors: Nomura Tomoko 
Published: July 2006

Abstract
The K3[Fe(1,1′-ferrocenedicarboxylato)3] complex was synthesized. The infrared absorption bands of the ligand (parent) acid, its potassium and barium salts, and the complex were assigned in studying the nature of the oxygen-to-metal bond in the complex. The electronic absorption spectra of the ligand acid and the complex were also measured. The techniques of thermogravimetry (TG) and differential thermal analysis (DTA) were used to establish the thermal decomposition of the complex.
Alcoholysis Equilibria of Dialkoxydimethylsilanes Catalyzed by Iodine or Iodine Monobromide
Authors: Ito Katsuko , Ibaraki Takeshi 
Published: July 2006

Abstract
Iodine or iodine monobromide was found to be an especially favorable catalyst for the study of the alcoholysis equilibria of dialkoxydimethylsilanes by gas chromatography. Iodine monobromide was employed to promote the reactions associated with tertiary alcohols, and iodine was used for the other reactions. Eight alcohols were allowed to react with diethoxydimethylsilane, and successive equilibrium constants, K1 and K2 were determined at 20 °C. K1=2.36–2.75 and K2=0.66–0.69 (by the use of primary alcohols), K1=1.34–1.38 and K2=0.28–0.30 (secondary alcohols), and K1=0.15–0.16 (tertiary alcohols) were observed. These values express precisely the difference of reactivities of the three groups of alcohols with diethoxydimethylsilane. Out of the dialkoxydimethylsilanes used in this study, eight unreported compounds were isolated and characterized.
Normal Pulse Polarographic Study of the Electrode Reaction of Copper(II) Complexes with Ethylenediaminetetraacetic Acid(EDTA) and N-(2-Hydroxyethyl)ethylenediamine-N,N′,N′-triacetic Acid(HEDTA)
Authors: Yamaguchi Shuichiro , Matsuda Hiroaki , Ohsaka Takeo , Oyama Noboru 
Published: July 2006

Abstract
The normal pulse polarographic behavior of the Cu(II)–EDTA and –HEDTA complexes was examined in a wide range of pH values to elucidate the mechanisms of their electrode reactions and to evaluate the relevant electro chemical kinetic parameters. From analysis of the dependence of the half-wave potentials on the sampling time and the hydrogen ion concentration, it was shown that the reduction wave of the Cu(II)–EDTA complexes observed in the pH range of 2.0 to 9.5 at −0.1 to −0.5 V vs. SCE corresponds to the simultaneous reduction of four complex species, CuH3L+, CuH2L0, CuHL−, and CuL2−, where CuHpL(p−2)+ and L4− denote the protonated complex species with p protons and the unprotonated EDTA ion, respectively. The reduction wave of the Cu(II)–HEDTA complexes in the pH range of 3.0 to 9.0 at −0.25 to –0.4 V vs. SCE corresponds to the simultaneous reduction of two complex species, CuHL0 and CuL−, where L3− denotes the unprotonated HEDTA ion. The kinetic parameters of the corresponding complex species (i.e. the cathodic transfer coefficient and the standard rate constant of electrode reaction) were evaluated.
Asymmetric Reduction of Chiral Pyruvamide with Sodium Borohydride
Authors: Munegumi Toratane , Harada Kaoru 
Published: July 2006

Abstract
Several amides of pyruvic acid with (S)-amines were reduced with sodium borohydride (NBH) in several alcohols and N-[(R)-lactoyl]-(S)-amines were obtained in excess. When the reductions were carried out in methanol or ethanol in the presence of metallic salt, N-[(S)-lactoyl]-(S)-amines were obtained in asymmetric yields up to 22%.
Revision of Structure of Anhydronellionol Triacetate
Authors: Matsumoto Takashi , Imai Sachihiko , Mitsuki Masanori , Maeta Seiji 
Published: July 2006

Abstract
The structure of anhydronellionol triacetate was revised to 11,12,16-triacetoxy-6-hydroxyabieta-5,8,11,13-tetraen-7-one (18) by the following syntheses. Acetylation of 16-acetoxyabieta-8,11,13-trien-12-ol, followed by oxidation with chromium trioxide, afforded 12,16-diacetoxyabieta-8,11,13-trien-7-one. This was converted into 6,12,16-triacetoxyabieta-5,8,11,13-tetraen-7-one (17) via 12,16-diacetoxyabieta-8,11,13-trien-6-one. Oxidation of 11,12,16-triacetoxyabieta-8,11,13-trien-6-one with Jones reagent gave 18, whose 1H NMR spectrum was in good agreement with that of natural anhydronellionol triacetate. 11,12,16-Triacetoxyabieta-5,8,11,13-tetraen-7-one (28) was also synthesized from 11,12,16-triacetoxyabieta-8,11,13-trien-7-one. The 1H NMR spectra of 17 and 28 were different from that of natural anhydronellionol triacetate. Since the revised structure 18 corresponds to dehydronellionol triacetate, the name of anhydronellionol should now be dropped from the list of natural diterpenes.
Conversion of Disilanes to Functional Monosilanes. XIII. The Palladium Catalyzed Reductive Coupling of Benzylidene Dichlorides and Benzylidyne Trichlorides Using Disilanes as Reducing Agents
Authors: Matsumoto Hideyuki , Arai Takeshi , Takahashi Masatoshi , Ashizawa Toshiyuki , Nakano Taichi , Nagai Yoichiro 
Published: July 2006

Abstract
The reaction of benzylidene dichlorides or benzylidyne trichlorides with 1,2-dichloro-1,1,2,2-tetramethyldisilane or hexamethyldisilane proceeded smoothly in the presence of acatalytic amount of Pd(PPh3)4 to give (E)-stilbenes or (E)- and (Z)-α,β-dichlorostilbenes in high yields, respectively. Also, in the presence of the palladium(0) catalyst, α,α-dichlorobenzyltrimethylsilanes reacted with hexamethyldisilane yielding (E)-α,β-bis(trimethylsilyl)stilbenes in quantitative yield.
The Crystal Structure of 2,11,20-Trithia[3.3.3](1,2,4)(1,3,5)cyclophane and Molecular Structures of Unsymmertically Tris-bridged[2.2.2](1,2,4)(1,3,5) and [2.2.2](1,2,4)(1,2,5)Cyclophanes, Estimated by Molecular Conformational Analysis
Authors: Kai Yasushi , Mizuma Takashi , Yasuoka Noritake , Kasai Nobutami 
Published: July 2006

Abstract
The crystal structure of 2,11,20-trithia[3.3.3](1,2,4)(1,3,5)cyclophane has been determined by the X-ray diffraction method and compared with the molecular structures of unsymmetrically tris-bridged [2.2.2](1,2,4)(1,3,5) and [2.2.2](1,2,4)(1,2,5)cyclophanes, estimated by molecular conformational analysis.
Kinetic Parameters of the Electrode Reaction of Carbonatocobalt(III) Complexes at Mercury Electrodes
Authors: Yamada Akifumi , Kado Yutaka , Yokoyama Yu 
Published: July 2006

Abstract
The electroreduction of [Co(CO3)(NH3)5]+, [Co(CO3)(NH3)4]+, [Co(CO3)(tn)2]+, [Co(CO3)(pn)2]+, [Co(CO3)(en)2]+, and [Co(CO3)2(en)]− (tn=trimethylenediamine, pn=propylenediamine, en=ethylenediamine) have been studied at mercury electrodes in weak acid solutions. All complexes exhibit two irreversible reduction waves; the first corresponds to CoIII→CoII, and the second, to CoII→Co0. The kinetic parameters of the electrode reactions of the first step were determined by means of Tast and pulse polarography in solutions containing 0.005 M sodium acetate-acetic acid buffer (pH=6) and 0.995 M sodium nitrate at 25 °C. The differential pulse polarograp hic characteristics of these complexes are also given.
Double Potential Step Chronoamperometry for Reversible Follow-up Chemical Reactions. Application to the Aquation Kinetics of Bis(ethylenediaminemonoacetato)cobalt(II)
Authors: Ohsaka Takeo , Sotomura Tadashi , Matsuda Hiroaki , Oyama Noboru 
Published: July 2006

Abstract
A theory of double potential step chronoamperometry (DPSCA) is developed for the reversible follow-up reactions represented as Ox+ne\ightleftarrowsRed, Red\oversetk\undersetkK\ightleftarrowsZ, where k and K are the rate and the equilibrium constants of the follow-up chemical reaction, respectively. DPSCA is applied to investigate the kinetics of aquation reaction of [Co(edma)2]0 (edma: ethylenediamine-N-acetate), which is produced by electrolytic reduction of [Co(edma)2]+ in the range of pH 1.5 to 10.5. At pH&lt;4.5, the aquation reaction of [Co(edma)2]0 is irreversible. The rate of aquation reaction is accelerated by hydrogen ions and approaches an upper limiting value (2.1×103s−1). At pH&gt;4.5,on the other hand, the hydrogen ions do not substantially contribute to the aquation and thus the rate approaches a lower limiting value (4.7×102s−1), which is in good agreement with that obtained in neutral region (4.5&lt;pH&lt;7), where the reverse (complex formation) reaction must be taken in to consideration. Above pH 7, the[Co(edma)2]0 species exists as main species in the solution and thus the kinetic behavior of the aquation is not observed. It is demonstrated that DPSCA is a useful method for kinetic studies of the dissociation-association reactions of labile complexes.
Synthesis of N-Unsubstituted Di- and Triaza Crown Ethers
Authors: Maeda Hirokazu , Furuyoshi Shigeo , Nakatsuji Yohji , Okahara Mitsuo 
Published: July 2006

Abstract
Facile syntheses of di- and triaza crown ethers by in tramolecular cyclization of oligoethylene glycols containing two or three imino groups or by their intermolecular cyclization with oligoethylene glycol bis(p-toluenesulfonate)s are described.
New Methods for the Synthesis of 3(2H)-Furanones and 2(5H)-Furanones
Authors: Saimoto Hiroyuki , Shinoda Masaki , Matsubara Seijiro , Oshima Koichiro , Hiyama Tamejiro , Nozaki Hitosi 
Published: July 2006

Abstract
New procedures for the synthesis of 3(2H)-furanones and 4-alkoxy-2(5H)-furanones are reported. Reaction of ketones with the lithium salt of propynal diethyl acetal, followed by treatment of the resulting 4-hydroxy-2-alkynal diethyl acetals with sulfuric acid–methanol, gave 2,2-disubstituted 3(2H)-furanones. The action of a polymer reagent Hg/Nafion-H upon 4–hydroxy-2-alkynones produced 2,2,5-trisubstituted 3(2H)-furanones. Reaction of 1,1,1-triethoxy-2-alkyn-4-ols (4) with trifluoroacetic acid and mercury(II) acetate provided 5-ethoxy-2,2-disubstituted 3(2H)-furanones. In contrast, the adducts 4 were converted into 4-alkoxy-5,5-disubstituted 2(5H)-furanones upon reaction with Hg/Nafion-H.
Phase Diagrams and Association Structures of Combined Surfactants–Water Systems
Authors: Sagitani Hiromichi , E. Friberg Stig 
Published: July 2006

Abstract
Phase regions were determined in systems with water and sodium dodecyl sulfate combined with a series of nonionic surfactants of the structure di-, tetra-, hexa-, and octaoxyethylene dodecyl ethers. The results showed the more hydrophobic members to act as cosurfactants, stabilizing the lamellar structure at high water contents. The more hydrophilic members of the nonionic series acted in a manner similar to ionic surfactants with a slight tendency to stabilization of the lamellar phase for 1:1 combinations of the surfactants.
Photoinduced Intramolecular Cyclization of 9-(ω-Anilinoalkyl)phenanthrenes
Authors: Sugimoto Akira , Sumi Katsumi , Urakawa Keiji , Ikemura Mamoru , Sakamoto Satoshi , Yoneda Shigeo , Otsuji Yoshio 
Published: July 2006

Abstract
Photoreactions of a series of compounds of the type 9-phenanthryl–A–CH2NHC6H5[–A–=o-phenylene (1b), –(CH2)2– (1c), –(CH2)3– (1d), –(CH2)4– (1e), –CH2– (1f)] in benzene were studied. From 1b–d, the spiro compounds are obtained by an intramolecular cis-addition of the N–H function to the C9, C10-double bond of the phenanthrene ring. These photoproducts can be converted to the starting materials by treating with trifluoroacetic acid or heating above their melting temperatures. The mechanistic features of these reactions are described.
Semiexperimental Magnetic Study of Some Methyl Derivatives of Benzoic Acid
Authors: Abdel-Kader Mohamed Mahmoud 
Published: July 2006

Abstract
The mean molar susceptibilities of some methyl derivatives of benzoic acid have been measured. From these measurements and the calculated value of the in-plane susceptibilities (K1, K2) of each molecule, the semiexperimental magnetic anisotropy of the acid molecule has been determined. The obtained magnetic data are explained on the basis of the hydrogen bonding systems of these molecules.
Capillary Ripple Response of Cholesterol and Lecithin Monolayers
Authors: Ahmad Jamil 
Published: July 2006

Abstract
Capillary ripple characteristics of monolayers of cholesterol and dipalmitoyllecithin and a 1 : 1 mixture of the two over air-water interface were studied. The ripple damping coefficient and the wavelength were determined as a function of the surface concentration. A stronger chain-chain interaction exists between the molcules in the pure cholesterol monolayer compared to pure lecithin as indicated by the sharp maximum in the damping coefficient curve for the former case. In the monolayer of the mixture, there is evidence of an interaction between the chains of the two substances.