bluuebunny/crossref_metadata_2025_split huggingface dataset:
Free Radical Alkylation of 1,3-Dimethyluracils and Caffeine with Benzoyl Peroxide
Authors: Itahara Toshio , Ide Naoko 
Published: July 2006

Abstract
Reaction of 1,3-dimethyluracil and 1,3,6-trimethyluracil with benzoyl peroxide in cyclohexane, ethyl acetate, and acetonitrile gave the corresponding 5-alkyl-1,3-dimethyluracils, although a steric effect of the methyl group at 6-position complicated the reaction. On the other hand, a similar treatment of 1,3-dimethylthymine led to alkylation of the methyl group at 5-position. The reaction of caffeine gave 8-alkylcaffeines and alkyl acetates were used as favorable solvents with respect to synthesis of 8-alkylcaffeines.
Simultaneous Generation of t-BuO· and t-BuOO· from the Decomposition of 2,2-Bis(t-butyldioxy)propane. A New Synthetic Method for Introducing a t-BuOO Group into Organic Molecules
Authors: Watanabe Yasumasa , Ohta Kenjiro , Suyama Shuji 
Published: July 2006

Abstract
A free-radical synthetic method for introducing a t-BuOO group into various organic substrates has been developed using 2,2-bis(t-butyldioxy)propane (1a) which can efficiently give two oxygen-centered radicals, t-BuO· and t-BuOO·, by thermolysis. The thermal reaction of 1a with cumene afforded the desired dialkyl peroxide, t-butyl 1-methyl-1-phenylethyl peroxide, in good yield (53% based on 1a reacted) together with an appreciable amount of a dimer, 2,3-dimethyl-2,3-diphenylbutane, as a by-product. The addition of t-BuOOH increased the yield of the dialkyl peroxide to as high as 82%, by suppressing the dimer formation ( &lt; 10%). Also, reaction with isobutyronitrile and isopropyl methyl ketone gave good yields of dialkyl peroxides. The present method makes it possible to prepare unsymmetrical dialkyl peroxides containing functional groups, if the substrates are good hydrogen donors.
Electronic Absorption and Phosphorescence Spectra of 2-Acetylfuran. Conformations in the Ground and Excited Triplet States
Authors: Okubo Jun , Hoshi Toshihiko , Ono Isao , Watanabe Seiichi , Kobayashi Michio , Inoue Hiroyasu 
Published: July 2006

Abstract
The electronic absorption and phosphorescence spectra of 2-acetylfuran were measured in various media at room and low temperatures. It was found that 2-acetylfuran exists as an equilibrium mixture of the O–O s-cis and O–O s-trans conformers in polyethylene (PE) film. Here, the O–O s-trans conformer was considered to be a major species, and the O–O s-cis conformer a minor species in a nonpolar medium such as PE. On the other hand, in a polar medium such as poly(vinyl alcohol), 2-acetylfuran existed almost completely as the s-cis conformer. The 0–0 phosphorescence bands of the O–O trans- and cis-species were at 447 and 427 nm in PE, respectively. The S1 states for both conformers are nπ* in character, while the T1 states are π π*.
A Stereocontrolled Synthesis of (4aS, 8aR)-(+)-7,7- Ethylenedioxy-4,4,8a-trimethyloctahydro-2(1H)-naphthalenone
Authors: Kato Michiharu , Watanabe Masataka , Masuda Yoshiaki 
Published: July 2006

Abstract
A stereocontrolled synthesis of (4aS, 8aR)-(+)-7,7-ethylenedioxy-4,4,8a-trimethyloctahydro-2(1H)-naphthalenone, which will act as a versatile building block for the asymmetric synthesis of natural products possessing a trans-1,1,4a-trimethyldecalin unit, was accomplished starting with (1R,4S,5R)-(+)-4,6,6-trimethyl-4-vinylbicyclo[3.1.1]-heptan-2-one, readily accessible from (+)-nopinone.
Treatment of Dimethoxyparacyclophanes with Ammonium Cerium(IV) Nitrate
Authors: Takeshita Michinori , Tsuzuki Hirohisa , Tashiro Masashi 
Published: July 2006

Abstract
The treatment of dimethoxy[n]paracyclophanes (n = 7–12) (5), [2]paracyclo[2]thiophenophane (13), and dimethoxy[2.2]paracyclophane (8) with CAN in MeCN–water afforded 2,4-cyclohexadien-1-ones 9, [8]paracyclophanedione 10, the ring-opened esters 11, and ketones 12. When the n value of 5 was 7, 8, or 9, rearrangement of the methylene bridge occurred and 9 was obtained as the main products. With the n value of 12, quinone 10 was the main product. Whereas, treatment of 13 with CAN afforded the ring-opened ester 14 as the sole product. These results show that formation of 9 is dependent on the strain of the paracyclophanes. Epoxide A was proposed as an intermediate of these reactions.
Catalytic Conversion of Diethyl Tartrate into Pyruvate over Silica-Supported Potassium Disulfate
Authors: Sugiyama Shigeru , Fukunaga Sadao , Kawashiro Katsuhiro , Hayashi Hiromu 
Published: July 2006

Abstract
Potassium hydrogensulfate (KHSO4), which melts at a lower temperature of 197 °C, was adapted for vapor-phase fixed-bed flow operations as a silica-supported potassium disulfate (K2S2O7/SiO2) to afford 60% ethyl pyruvate continuously from the tartrate at 300 °C. The catalyst was effective for the intramolecular dehydration of glycol moieties, much less active for hydrolysis of esters, and capable of converting enol- to keto-form for the intermediate oxalacetate in favor of pyruvate. A TGA analysis revealed that KHSO4 was converted to K2S2O7 at 300 °C, this was in consistent with the XRD analysis.
Crystal Structures and Molecular Packing of Tetrakis(alkylthio)tetrathiafulvalene (TTCn–TTF); (Part II) (n = 7,9,11)
Authors: Nakano Chikako , Mori Takehiko , Imaeda Kenichi , Yasuoka Noritake , Maruyama Yusei , Inokuchi Hiroo , Iwasawa Naoko , Saito Gunzi 
Published: July 2006

Abstract
The crystal structures of tetrakis(alkylthio)tetrathiafulvalene (TTCn–TTF) with long alkyl chains (7 ≤ n ≤ 11) can be divided into two different groups (Form I and Form II) according to the difference in the arrangement of the alkyl chains. Although the crystals of TTC7–TTF exhibit two phases (triclinic and monoclinic), the stacking manner of these phases is nearly the same, Form II. TTC9–TTF crystallizes in two different forms: Form I (the triclinic phase) and Form II (the monoclinic phase). The TTC11–TTF crystal only adopts the Form I structure. Although the molecules in both forms have chair-like shapes and columnar structures, the alkyl chains in the Form I crystals are arranged parallel to each other, resulting in more strongly fastened packing than in the case of the Form II crystals. These results are associated with changes in the electrical resistivities and activation energies of TTCn–TTF over the range of large n.
Equation of State of the Fluid Defined by the Modified Buckingham (exp-6) Potential Derived by Molecular Dynamics Simulations
Authors: Kataoka Yosuke 
Published: July 2006

Abstract
Molecular dynamics simulations have been performed in a wide range of the temperature-density space. The calculated energy and pressure were fitted to obtain the equation of state of the modified Buckingham (exp-6) potential system. This potential function has three parameters; the size, energy, and steepness parameters in the exponential repulsion term. The Helmholtz free energy measured from the ideal gas was expanded in a series of temperature, density, and the steepness parameter. The liquid-gas critical point was examined as a function of the steepness parameter. The liquid–vapor phase boundary was compared with that of the Lennard–Jones fluids. The results reveal how entropy, energy and pressure depend on the steepness parameter.
X-Ray Structural Study of trans-[CoCl2(232N415)]ClO4 (232N415 = 1,4,8,11-Tetraazacyclotricosane)
Authors: Kawano Shigeki , Ohba Shigeru , Tsuchimoto Masanobu , Fujita Junnosuke 
Published: July 2006

Abstract
The structures of two isomers of trans-[CoCl2(232N415)]+ in the perchlorate salt have been determined by single-crystal X-ray diffraction. Symmetry in the coordination of the macrocyclic ligand, 232N415, around the cobalt atom is absent for both isomers, and they are called C1 and C1′ isomers. C1 isomer, (1): monoclinic, space group P21/n, a = 14.600(2), b = 21.643(3), c = 8.298(1) Å, β = 100.78(1)°, V = 2575.8(6) Å3, Z = 4, R = 0.063 for 2446 observed unique reflections. C1′ isomer, (2): monoclinic, space group P21/n, a = 19.579(2) b = 7.423(1), c = 19.636(2) Å, β = 115.68(1)°, V = 2571.9(4) Å3, Z = 4, R = 0.068 for 2416 reflections. The fifteen-membered chelate ring takes a pseudo-skew form in 1 and a pseudo-envelope form in 2, as the result of the different disposition of the C atoms bonded to two N atoms of the ring, 1trans and 2cis. The Co–N bond lengths in the fifteen-membered ring are from 2.011(6) to 2.026(9) Å, which are longer by ca. 0.05 Å than the other Co–N distances in the complex cations.
Peri-Selective Cycloaddition Reactions of 3-Methoxycarbonyl-2H- cyclohepta[b]furan-2-one with 6,6-Dimethylfulvene
Authors: Yasunami Masafumi , Kitamori Yoichiro , Kikuchi Ikue , Ohmi Hajime , Takase Kahei 
Published: July 2006

Abstract
The cycloaddition reaction of 3-methoxycabonyl-2H-cyclohepta[b]furan-2-one with 6,6-dimethylfulvene was carried out under refluxing in ethanol, benzene, or xylene. The [4+2] cycloadduct was formed as a major product in ethanol or benzene together with the minor [8+2] cycloadduct. On the other hand, the [8+2] cycloadduct was formed as a single product in xylene. The [4+2] cycloadduct was completely changed to the [8+2] cycloadduct under refluxing in xylene by a retro–Diels–Alder reaction, a re-cycloaddition reaction followed by spontaneous decarboxylation. The structure of the [8+2] cycloadduct was clearly confirmed by chemical transformation to methyl 3-isopropyl-1H-cyclopent[a]azulene-9-carboxylate which was obtained by the hydride reduction of methyl 3-isopropylidene-3H-cyclopent[a]azulene-9-carboxylate.
Diastereoselectivity and Reaction Pathway of the Reactions of Benzaldehyde with Allylic Iodides in the Presence of Sn or Pb
Authors: Yamataka Hiroshi , Nishikawa Kazuyoshi , Hanafusa Terukiyo 
Published: July 2006

Abstract
The relative reactivity and stereoselectivity were determined in the Sn- or Pb-promoted reactions of substituted benzaldehydes with 3-iodo-1-propene and 1-iodo-2-butene. The reactivity data suggested that the reactions go through a direct nucleophilic addition mechanism. No indication of the occurrence of electron transfer was obtained by the dehalogenation probe experiment. The diastereoselectivity was low in the Sn/THF system but was high in Pb/DMF. Large solvent effects were observed in the erythro selectivity for the Sn-promoted reaction; erythro : threo ratio was 31 : 69 in CH2Cl2 and 84 : 16 in HMPA.
The Structure around the Nitrite Ion in Concentrated Aqueous Solutions
Authors: Kameda Yasuo , Arakawa Hiroshi , Hangai Katsuaki , Uemura Osamu 
Published: July 2006

Abstract
The hydration structure and intra-ionic geometry of NO2− in a 10 mol% NaNO2 solution in D2O have been determined by the time-of-flight neutron diffraction. Measurements were made with two solutions which are identical in all respects except for the isotopic substitution of nitrogen atom. It appears that there exist 3.7 ± 0.5 water molecules coordinated to NO2− with the intermolecular distance r(N···D) = 2.71 ± 0.02 Å. The intramolecular bond distance rNO and the root mean square amplitude lNO in NO2− have precisely been determined.
The Optical Properties of the Bc2DDQ Crystal and Its Solid Phase Reaction
Authors: Tanaka Masashi , Murata Shizuaki , Takeuchi Hideo , Matsuo Susumu 
Published: July 2006

Abstract
Benzo[c]cinnoline (Bc) and 2,3-dichloro-5,6-dicyano-1,4-benzoquinone (DDQ) give a charge-transfer (CT) complex with the formula Bc2DDQ. The reflection spectra of the crystal of the Bc2DDQ complex were measured and the charge-transfer degree in the Bc2DDQ complex was estimated to be about 18%. This crystal exhibits a solid-phase reaction at 138 °C. Its thermal reaction was studied by the differential scanning calorimetry, thermogravimetry and the GC/MS spectra as well as the IR and ESR spectra and the temperature dependence of the magnetic susceptibility.
An NMR Study of the Carbanions Produced from Triphenylethylene and Its Methyl-Substituted Derivatives
Authors: Fujiwara Hideaki , Yoshino Akihiro , Yokoyama Yukihiro , Takahashi Kensuke 
Published: July 2006

Abstract
The triphenylethylene dianion, which was produced by reducing triphenylethylene with metallic potassium in THF, was characterized by 1H and 13C NMR spectroscopy. The 1H spectrum was assigned by making spectral comparisons with those of dianions having methylphenyl groups. The 1H and 13C NMR data showed that two geminal phenyl rings were magnetically equivalent. This result indicated that a rapid rotation exists around the bond at room temperature. Extra charge distributions in the dianion were estimated; these are discussed together with the data for the other carbanions.
An Isomeric Series of Thiophene-Fused Tetracyanoquinodimethanes. I. Preparation and Physico-Chemical Properties
Authors: Kobayashi Keiji , Gajurel Chhabi L , Umemoto Kisaburo , Mazaki Yasuhiro 
Published: July 2006

Abstract
Four isomeric benzodithiophene analogs of 11,11,12,12-tetracyano-9,10-anthraquinodimethane have been prepared via a TiCl4 mediated condensation of the corresponding quinone and malononitrile. The reduction potential of these isomers was interpreted in terms of the resonance energies for the neutral and radical anion species. These new acceptor compounds, except for 4,8-bis(dicyanomethylene)-4,8-dihydrobenzo[1,2-c:4,5-c′]dithiophene, formed crystalline charge-transfer complexes with tetrathiafulvalene, among which the complex of 4,8-bis(dicyanomethylene)-4,8-dihydrobenzo[1,2-b:4,5-b′]dithiophene particularly exhibited a high room-temperature conductivity of 4.78 S cm−1.
An Isomeric Series of Thiophene-Fused Tetracyanoquinodimethanes. IV. Crystal Structure of 2 : 3 Charge-Transfer Salt with Tetraethylammonium
Authors: Yasui Masanori , Hirota Masamichi , Endo Yuji , Iwasaki Fujiko , Kobayashi Keiji 
Published: July 2006

Abstract
The crystal structure of the charge-transfer salt of one of the isomeric thiophene-fused TCNQs, 4,8-bis(dicyanomethylene)-4,8-dihydrobenzo[1,2-b : 4,5-b′]dithiophene (1), with tetraethylammonium has been determined by the X-ray method. Crystals of 2C8H20N+·(3C16H4N4S2)2− belong to monoclinic system, P21/n, Z = 2, a = 10.944(2), b = 28.765(8), c = 9.244(2) Å, β = 90.00(2)°, V = 2910(1) Å3, Dx = 1.381 Mg m−3 and Dm = 1.36(2) Mg m−3. The final R value is 0.064 for 4224 observed reflections. Two independent molecules, A and B, of 1 stack to form infinite columns along the a axis as ABBABB··· manner. The separations of the molecular planes are 3.47 and 3.39 Å, for A···B and B···B, respectively. The columns are linked side-by-side with short S···S contacts of 3.570(3) and 3.529(3) Å. From the comparison of the bond lengths of TCNQ frameworks A shows the neutral character, while B shows anionic structure.
Kinetics of the Forward and Reverse Na(I)–H(I) and K(I)–H(I) Exchanges on Antimony(V) Arsenatophosphate Cation Exchanger
Authors: Varshney Krishna Gopal , Khan Asif Ali , Khan Ashfaq Rabbani 
Published: July 2006

Abstract
Kinetic studies have been made on antimony(V) arsenatophosphate cation exchanger, for the forward and reverse Na(I)–H(I) and K(I)–H(I) exchange processes. On the basis of such studies the self diffusion coefficients, energies of activation, and entropies of activation have been evaluated.
Electrical Properties and Sinterability for Lithium Germanium Phosphate Li1+xMxGe2−x(PO4)3, M = Al, Cr, Ga, Fe, Sc, and In Systems
Authors: Aono Hiromichi , Sugimoto Eisuke , Sadaoka Yoshihiko , Imanaka Nobuhito , Adachi Gin-ya 
Published: July 2006

Abstract
The electrical properties and sinterability were studied for Li1+xMxGe2−x(PO4)3, M = Al3+, Cr3+, Ga3+, Fe3+, Sc3+, and In3+ systems. Due to the closer ionic radius of Al3+ and Cr3+ compared to that of Ge4+, those M3+ ions easily substitute the Ge4+ site. Larger cations, such as Ga3+, Fe3+, Sc3+, and In3+, were difficult to substitute the Ge4+ site. The ionic conductivity and sinterability improved with an increase in x for all of the M3+-substituted systems. In particular, an Al3+- or Cr3+-substituted system shows higher conductivity; the maximum conductivity is 2.4 × 10−4 S cm−1 at 298 K for Li1.5Al0.5Ge1.5(PO4)3. The enhancement in the conductivity is attributed to a decrease in the porosity and a lowering of the activation energy in the grain boundaries. The activation energy for Li+ ion conduction of the bulk component was 0.38 eV for Li1+xMxGe2−x(PO4)3 electrolytes, and was almost independent of M3+ substitution.
Study of Equilibria and Kinetics of the Interactions of Iron(III) with 8-Hydroxyquinoline and 8-Hydroxyquinoline-5-sulfonic Acid in HClO4–NaClO4 Media
Authors: Das Asim Kumar 
Published: July 2006

Abstract
The equilibria and kinetics of the reaction of iron(III) with 8-hydroxyquinoline (oxine) and 8-hydroxyquinoline-5-sulfonic acid under the condition of 1 : 1 chelate formation at different temperatures (35–45 °C) and ionic strength I = 1.0 mol dm−3 (NaClO4 + HClO4) have been studied. A dual path mechanism involving both Feaq3+ and Fe(OH)aq2+ species and the undissociated ligand (LH2+, LH2±) is consistent with the experimental observations under the experimental condition. The different rate constants have been deternined from the attainment of the equilibrium from both directions i.e., from the study of complex formation at low acid concentration and from the study of decomposition of the complex in presence of higher acid concentration. The results obtained from the both studies are found comparable within the experimental error limit. The results conform to kobsd/B = k1[H+] + k2Kh where,
; Kh = hydrolysis constant of Feaq3+, k1 and k2 are the forward second order rate constants of Feaq3+ and Fe(OH)aq2+ respectively and Q is the equilibrium constant of the reaction, Fe3+ + LH2+ FeL2+ + 2H+ where LH2+ represents the protonated form of the ligand, 8-hydroxyquinoline and a similar reaction occurs for 8-hydroxyquinoline-5-sulfonic acid (LH2±). Thermodynamic parameters for each of the steps have been determined. The results are compared with those of recent findings in the interaction of cerium(IV) with these ligands in perchloric acid media. Fe(OH)aq2+ appears to react through a purely dissociative fashion (Eigen–Tamm mechanism) and its characteristic water exchange rate has been found, as a rough estimate. On the other hand Feaq3+ appears to react through the associative interchange (Ia) mechanism. The equilibrium constants (Q) obtained spectrophotometrically have been compared with those obtained from kinetic studies.
Utilization of Enzymatic Digestion for the Study of the Macromolecular Effect in Complexation Processes. Protonation and Copper Coordination Equilibria of Hyaluronate and Its Fragments
Authors: Burger Kálmán , Sipos Pál , Illés János 
Published: July 2006

Abstract
The effect of enzymatic digestion on the proton and copper(II) binding ability of hyaluronate (HYA), a macromolecular polyelectrolyte, and its fragments were studied via potentiometry. The degree of depolymerization was measured by spectrophotometry. The log Kapp vs. α functions (where α is the mole fraction of dissociated carboxyl groups in the samples) and the protonation group constants were determined in the native and enzymatically partly and completely decomposed samples. The two different data treatments led to the same chemical consequences. The interaction between copper(II) and HYA was found to be less dependent on the degree of depolymerization than that between H+ and HYA, the results indicating an almost negligible role of longrange electrostatic forces in the copper(II)–HYA interaction. All the investigations demonstrated that enzymatic digestion can be used advantageously for the characterization of the macromolecular effect in coordination processes.
Dynamic NMR as a Nondestructive Method for the Determination of Rates of Dissociation. XX. Secondary Isotope Effect on Kinetic Basicity of Amine Ligands in Boronate–Amine Complexes and Ammonium Salts
Authors: Toyota Shinji , Oki Michinori 
Published: July 2006

Abstract
Secondary isotope effects on the kinetic basicity of amine ligands in boronate-amine complexes and ammonium salts were first determined by taking advantage of the rate constants of the dissociation of the amine ligands measured by the dynamic NMR method. The basicities of amine ligands are enhanced by the α-deuterations in the both compounds and the isotope effect caused by a deuterium is larger in the boronate complexes than the ammonium salts. These isotope effects are discussed on the basis of the inductive and steric effects.
Studies on Fused 2(1H)-Pyridenethiones: New Routes for the Synthesis of Fused 1H-Pyrazolo[3,4-b]pyridines and Fused Thieno[2,3-b]pyridines
Authors: Al-Kaabi Sharifa Soltan , Elgemeie Galal Eldin Hamza 
Published: July 2006

Abstract
A synthesis of fused 1H-pyrazolo[3,4-b]pyridines and fused thieno[2,3-b]pyridines utilizing fused 2(1H)-pyridinethiones as starting components is described. The structures of the products were assigned and confirmed on the basis of their elemental analysis and spectral data.
Studies on Fused β-Lactams: Synthesis of 1-Aza Analogs of Cephem
Authors: Sharma S D , Kaur Verinder , Bhutani Punita , Khurana J P S 
Published: July 2006

Abstract
Annelation of 2-methylthio-3,4-dihydropyrimidine (3) with two moles of phenoxyacetyl chloride in presence of triethylamine did not yield the expected β-lactam (6) and instead the N-acylated compound 5a was obtained. Various N-acylated pyrimidines 5a–d also failed to yield any β-lactam. However, β-lactam ring has been conveniently grafted on to 2-methylthio-3,6-dihydropyrimidines 9a–d, 12 by annelating them with in situ prepared aryloxyketenes to furnish novel 1-aza analogs of cephem 10a–e and 13.
Terminal–Terminal Types of Liquid Crystals. III. Thermal and Electrooptical Behavior of Liquid Crystalline Bis[urethane]s
Authors: Sugiyama Kazuo , Kato Koichi , Shiraishi Kohei 
Published: July 2006

Abstract
Novel terminal-terminal types of liquid crystalline bis[urethane]s 3, prepared from (S)-2-methylbutyl 4-[4-(11-hydroxyundecyloxy)benzylideneamino]cinnamate 2 and various diisocyanates, were studied by differential scanning calorimetry (DSC) and polarized optical microscopy (POM). Bis[urethane]s 3c obtained from 1,3-diisocyanatobenzene and 3d from 2,4-diisocyanatotoluene exhibit a smectic state, while bis[urethane]s 3a obtained from 1,6-diisocyanatohexane, 3b from bis(4-isocyanatophenyl)methane and 3e from 2,6-diisocyanatotoluene show no mesophases. It was found from IR spectroscopic results that inter- and intramolecular hydrogen bondings due to N–H and C=O of urethane bonds play an important role in the formation of mesophase. The dual-frequency drive, based on light scattering driven by the application of an a.c. current at different frequencies, was studied in the smectic A state of 3c and 3d: τr at 0.1 Hz are 0.84 and 0.25 s, τr at 1 kHz are 9.75 and 8.95 s for 3c and 3d, respectively.
Formation of Zinc Oxide by Homogeneous Precipitation Method
Authors: Fujita Kazumi , Matsuda Keizo , Mitsuzawa Shunmei 
Published: July 2006

Abstract
The process of ZnO formation depends on the concentration of ZnCl2 and the (CH2)6N4/ZnCl2 molar ratio(R), and there are two routes leading to ZnO: One is its direct formation, and the other is via Zn5Cl2(OH)8 as an intermediate.
Bis{2-(dimethylphosphino)ethane-1-thiolato}-nickel(II), -palladium(II), and -platinum(II) Complexes, and Molecular Structure of the Nickel(II) Complex
Authors: Kita Masakazu , Yamamoto Takashi , Kashiwabara Kazuo , Fujita Junnosuke 
Published: July 2006

Abstract
Bis{2-(dimethylphosphino)ethane-1-thiolato} complexes Ni(II), Pd(II), and Pt(II) were newly prepared, and the molecular structure of the Ni(II) complex was determined by X-ray analysis to have a square planar trans(P,P) geometrical configuration. The 1H, 13C, and 31P NMR spectra of the complexes in CDCl3 indicate a trans(P,P) structure for the nickel(II) and palladium(II) complexes and a cis(P,P) one for the platinum(II) complex.