bluuebunny/crossref_metadata_2025_split huggingface dataset:
Facile Formation of Stable Crystals with Gold-like Metallic Luster from Organic Molecules: 1-Aryl-2-(2-thienyl)-5-[5-(tricyanoethenyl)-2-thienyl]pyrroles
Authors: Ogura Katsuyuki , Zhao Rui , Yanai Hiroyuki , Maeda Kazuhiro , Tozawa Ryo , Matsumoto Shoji , Akazome Motohiro 
Published: November 2002

Abstract
The derivatives of 1-phenyl-2-(2-thienyl)-5-[5-(tricyanoethenyl)-2-thienyl]pyrrole (1a) formed crystals with gold-like or bronze-like metallic luster. When a small substituent is located at the para position of the 1-phenyl group, gold-like lustrous crystals were formed. In contrast, the derivatives of 1 having a longer alkyl chain at the para position of the 1-phenyl group gave bronze-like crystals. The gold-like lustrous crystals have a sheet structure. In the sheet, the molecules of 1 are close to each other via the intermolecular interaction of cyano nitrogen with the hydrogen of the nearest thiophene or pyrrole ring, which enables the side-by-side interaction of the cyano group with the nearest thiophene and pyrrole rings. The bronze-like crystals have a lamella structure of the long alkyl chains that is sandwiched by two π-electron walls. In the wall, the 2-(2-thienyl)-5-[5-(tricyanoethenyl)-2-thienyl]pyrrole moieties are arranged in a ribbon structure to interact to each other. The relationship of the arrangement of the 2-(2-thienyl)-5-[5-(tricyanoethenyl)-2-thienyl]pyrrole moieties with the metallic color of the crystals is discussed.
Interactions of Tetrakis(4-carboxyphenyl)porphyrin with Cyclodextrins in Aqueous Solutions Containing 1,1′-Diheptyl-4,4′-bipyridinium Dibromide
Authors: Hamai Sanyo 
Published: November 2002

Abstract
In pH 10.1 buffers, the interactions of tetrakis(4-carboxyphenyl)porphyrin (TCPP) with γ-cyclodextrin (γ-CD), heptakis(2,3,6-tri-O-methyl)-β-CD (TM-β-CD), and 1,1′-diheptyl-4,4′-bipyridinium dibromide (HB) have been examined by studying absorption, fluorescence, and induced circular dichroism spectra of TCPP. TCPP has been found to form inclusion complexes with γ-CD and TM-β-CD. The stoichiometries of the γ-CD–TCPP and TM-β-CD–TCPP inclusion complexes are 1 : 1 and 2 : 1, respectively. Because the equilibrium constant for the formation of the 2 : 1 TM-β-CD–TCPP inclusion complex is exceedingly large (4.34 × 1018 mol−2 dm6), the TM-β-CD–TCPP inclusion complex is quantitatively formed in TCPP solutions containing two equivalents of TM-β-CD. TCPP also forms an organic cation–organic anion complex with HB. In the presence of γ-CD, the TCPP–HB complex forms a 1 : 1 : 1 γ-CD–TCPP–HB inclusion complex, although TM-β-CD causes the dissociation of the TCPP–HB complex into its components. The equilibrium constant for the formation of the γ-CD–TCPP–HB inclusion complex from the TCPP–HB complex and γ-CD has been evaluated to be 905 mol−1 dm3.
Magnetic Field Effects on Anodic Oxidation of Potassium Iodide
Authors: Uechi Ichiro , Fujiwara Masao , Fujiwara Yoshihisa , Yamamoto Yohsuke , Tanimoto Yoshifumi 
Published: November 2002

Abstract
External magnetic fields (≤ 6 kG) significantly increase yields of I3− and H2 as well as oxidation currents in anodic oxidation of potassium iodide. The Lorentz force on ions in the solution induces convection of solution, resulting in acceleration of the entire reaction rate. This is further confirmed from the observation that reddish-brown streams of I3− in the solution, moving downward at zero field, undergo turbulent motion in magnetic fields.
Crystal Chemistry of Photodimers of 2-Benzyl-5-benzylidenecyclopentanone
Authors: Honda Kazumasa 
Published: November 2002

Abstract
The crystal structure of the photodimer of 2-benzyl-5-benzylidenecyclopentanone was determined using a recrystallized crystal. It was identical to that of an as-photoirradiated dimer crystal obtained by a single-crystal-to-single-crystal photoreaction of the monomer. This suggests that the starting material already possesses the most favored crystal phase for the products.
Recent Decline of Atmospheric Concentration and Emission of Methane in Nagoya Metropolitan Area
Authors: Ito Akinori , Yamada Shishin , Higuchi Takuya , Ishikawa Yuzo , Nagata Yoko , Chiba Koichi , Haraguchi Hiroki 
Published: November 2002

Abstract
Anthropogenic emissions of methane (CH4) from major sources such as landfills, automobiles, and rice paddy fields in the Nagoya metropolitan area were estimated using several emission process parameters such as emission factors and activity data for the decade from 1988 to 1997. The sum of CH4 amounts emitted from these three major sources was calculated to be 4.93 Gg of CH4 in 1988 and 5.19 Gg of CH4 in 1997. Methane emissions from the 12 landfill sites located around the Nagoya metropolitan area gradually increased until 1996 and then decreased in 1997, while those from automobiles and rice paddy fields continuously declined for the same decade. The total amount of CH4 emitted from the 12 landfills was much larger than those from other two sources. In 1993, for example, the amount was estimated as 3.26 Gg of CH4, 58% of which was generated from the largest landfill site. The excess CH4 concentration in the urban atmosphere, which was estimated from the difference between the CH4 concentration at the urban site and the background CH4 concentration at the Mauna Loa observatory, Hawaii, USA, showed the long-term trends similar to the CH4 emission from the largest landfill site. As a result, we conclude that the CH4 emission from the largest landfill dominantly impacted on the excess CH4 concentration due to the major sources in the Nagoya metropolitan area.
Conformation of 18-Membered Tetraimino Macrocyclic Complex; Structure of Two Metal Complexes and Molecular Mechanics Study
Authors: Tsubomura Taro , Ito Mitsuru , Fujita Tomochika 
Published: November 2002

Abstract
The conformations of metal complexes of 18-membered tetraimino macrocycles have been studied. A correlation between the bond length of the metal–nitrogen bond and the conformation of the macrocycle has been found in the published X-ray data. Molecular mechanics (MM) calculations based on the Points-On-a-Sphere (POS) method reproduce the correlation. The effect of the MM force constants on the conformation of the ligand has been extensively studied. The MM study clarified that the conformation of the macrocycle is principally determined by the length of the coordination bond and that the methyl groups substituted at the imine carbon plays an important role in the conformation of the macrocycles. Two X-ray crystal structure analyses of macrocycle LH complexes, [Ba(LH)(ClO4)2Ba(LH) (H2O)(ClO4)-(μ-ClO4)] and [Sr(LH)(ClO4)2], were included in the study to complement the structural data.
Intercalation of a Cationic Surfactant in the Interlayer Space of Smectites
Authors: Sakai Yasuzo , Kato Norihiro , Arai Misako , Takahashi Fujio , Nishida Yuichi 
Published: November 2002

Abstract
The properties of cationic surfactant-clay mixtures were examined by measurements of the electric conductivity, absorption spectra, and X-ray diffraction patterns. The orientation of N-[[4-(aminoiminomethyl)amino]butyl]dodecanamide (DAG) as a intercalated cationic surfactant and the thickness of the interlayer space of clay using Na-saponite (Sumecton SA) were investigated. DAG molecules were intercalated in a 1 nm gap in the interlayer space of clay. It is speculated that alkyl groups of the surfactant molecules are placed not parallel, but inclined slightly vertical to the internal surface of Na-saponite.
Transition Moments of Visible Region Absorption Bands of trans(Cl)-Triammineaquadichlorocobalt(III) Chloride
Authors: Mitsutsuka Yoshihiro , Nawa Nobuhiko , Yoshizawa Shuji , Yajima Hirofumi , Iriyama Keiji , Hidaka Hisao , Tsuboi Masamichi 
Published: November 2002

Abstract
From single crystals of trans(Cl)-[CoCl2(NH3)3(H2O)]Cl, thin sections with different orientations and different thicknesses were prepared, and their polarized absorption spectra were examined in the 350–850 nm region using a microspectrophotometer. Two absorption peaks, caused by the (x2−y2 ← xy)-type transitions of the d-electrons of Co, were found: a 15750 cm−1 peak was assigned to overlapping A2 ← A1 and B2 ← A1 type transitions of the complex ion with C2v symmetry; a 19210 cm−1 peak was assigned to a B1 ← A1 type transition. The molar extinction coefficients (ε) were determined at each of these peaks: ε(||c) = 104 and ε (⊥c) = 16 l cm−1 mol−1 at 15750 cm−1, and ε(||c) = 5 and ε(⊥c) = 54 l cm−1 mol−1 at 19210 cm−1. These ε values were explained by taking distortions of the d-electron orbitals into consideration, that are partly caused by the oxygen atom coordination and partly by some vibronic couplings between the d-electron orbitals and cobalt-ligand stretching vibrations.
Formation of Two Chromium(III) Dithiocarbamates from Cr(VI) in Solvent Extraction System and Origin of Oxygen Atom in Bis(1-pyrrolidinecarbodithioato)[1-pyrrolidinecarbothio(thioperoxoato)]chromium(III)
Authors: Honma Yoshiro 
Published: November 2002

Abstract
In order to explore the cause of a distinctive extraction behavior of Cr(VI) in the dithiocarbamate formation-solvent extraction systems, extracted chromium compounds were investigated and relationships between the formation of the compounds and the extraction behavior were studied. Chromatographic separation and spectroscopic analyses showed that two kinds of chromium(III) dithiocarbamates (i.e. tris(1-pyrrolidinecarbodithioato)chromium(III) and bis(1-pyrrolidinecarbodithioato)[1-pyrrolidinecarbothio(thioperoxoato)]chromium(III)) were formed and extracted in an ammonium 1-pyrrolidinecarbodithioate (APCD)/diisobutyl ketone (DIBK) solvent extraction system. The two products comprised most of the extracted chromium. Concentrations of the two dithiocarbamates in extracts were determined using double wavelengths analysis. The dependence of concentration ratio of the two complexes on pH was also investigated. The results of the investigation clarified that a major extract obtained under high pH condition was the thioperoxo complex and that the percentage of the tris complex increased with decreasing pH. Furthermore, it was clarified that the unusual extraction behavior of chromate was distinguished by the formation of thioperoxo complex. In order to elucidate the formation mechanism of the thioperoxo complex, the origin of an oxygen atom in the molecule of the thioperoxo complex was determined with an isotope labeling technique. The labeling experiments clarified that the source of the oxygen atom of the complex molecule was chromate ion and that the oxygen atom was fixed to chromium atom prior to the rate determination step of the formation of the thioperoxo complex.
New Zinc(II) Complexes with Tetradentate Amino Acid Derivatives: Structure Characterization, Solution Chemistry, and in vitro Insulinomimetic Activity
Authors: Yoshikawa Yutaka , Kawabe Kenji , Tadokoro Makoto , Suzuki Yuka , Yanagihara Naohisa , Nakayama Akihiro , Sakurai Hiromu , Kojima Yoshitane 
Published: November 2002

Abstract
Twelve new amino acid derivatives/Zn(II) complexes were prepared by the reactions of ZnSO4 and nine tetradentate ligands, Gly, Ala, Val, Leu, Ser and His derivatives and three pentadentate ligands, Asp and His derivatives. The X-ray structure analysis of [Zn3(N-pyridylmethyl-His)3(H2O)2](ClO4)3·2H2O revealed the formation of a trinuclear complex, in which three tetradentate ligands and two water molecules coordinate to three Zn(II), but the complex in an aqueous solution is present as a monomeric complex ion. Several Zn(II) complexes were found to have in vitro insulinomimetic activity which was estimated by the inhibition of free fatty acid release in isolated rat adipocytes treated with epinephrine. It was revealed that the insulinomimetic activities of Zn(II) complexes with the stability constants (log β) less than 11 were higher than that of VOSO4 and were comparable to that of ZnSO4 as positive controls except in the cases of two complexes with Gly derivatives, Zn(N,N-dipyridylmethyl-Gly)+ and Zn(N,N′-trimethylene-bis-Gly).
Preparation, Crystal Structures, Electrochemical and Spectroscopic Properties of Bis(2,2′-bipyridine)ruthenium(II) Complexes Containing 8-(Diphenylphosphino)quinoline or 2-(Diphenylphosphino)pyridine
Authors: Suzuki Takayoshi , Kuchiyama Takashi , Kishi Shinobu , Kaizaki Sumio , Kato Masako 
Published: November 2002

Abstract
Mixed-ligand bis(2,2′-bipyridine)ruthenium(II) complexes containing a hybrid donor-type P–N ligand of 8-(diphenylphosphino)quinoline (Ph2Pqn) or 2-(diphenylphosphino)pyridine (Ph2Ppy), [Ru(bpy)2(Ph2Pqn or Ph2Ppy)](PF6)2 (1 or 2; bpy = 2,2′-bipyridine), have been prepared. The X-ray crystal structure analyses of 1 and 2 revealed that Ph2Pqn and Ph2Ppy act as a bidentate ligand to form a five- and four-membered chelate ring, respectively. The four-membered chelate ring formed by Ph2Ppy has a very small bite angle (P(1)–Ru–N(1): 68.4(1)°), but the RuII(bpy)2 moiety in 2 has a typically strain-free structure. On the other hand, in the Ph2Pqn complex 1, one of the bpy planes is skewed remarkably from the Ru coordination plane due to an intramolecular steric interaction with a phenyl ring of Ph2Pqn. The redox potentials and the 1MLCT transition energies of the Ph2Pqn and Ph2Ppy complexes (1 and 2) were not so different from the averaged values of those of the corresponding 1,2-bis(diphenylphosphino)benzene (dppb) and 1,10-phenanthroline (phen) complexes, [Ru(bpy)2(dppb or phen)](PF6)2 (3 or 4). These facts indicate that the electronic asymmetry inherently present in Ph2Pqn and Ph2Ppy does not affect remarkably the ground state properties of the complexes. However, unlike complexes 2–4, the Ph2Pqn complex 1 in EtOH/MeOH (4 : 1) glass at 77 K exhibited a novel dual emission, giving a biexponential emission decay. The shorter-lived (τ = 10.8 µs) emission is attributable to the bpy-based 3MLCT emission, similar to the other RuII-polypyridine complexes, while the longer-lived (τ = 62.1 µs) emission can probably be assigned as arising from the quinoline-based 3(π–π*) excited state.
Valence States and Structure of Mixed-Valence Dinuclear Iron(II,III) Complexes [Fe2(2,6-bis[bis(2-pyridylmethyl)aminomethyl]-4-methylphenol)(L)2](BF4)2
Authors: Maeda Yonezo , Ishida Akiko , Ohba Masaaki , Sugihara Shinji , Hayami Shinya 
Published: November 2002

Abstract
Mixed-valence dinuclear iron(II,III) complexes, [FeIIFeIII(bpmp)(L)2](BF4)2, have been prepared, and the structures, electrochemical properties and rates of intramolecular electron transfer of the complexes have been examined, where Hbpmp represents 2,6-bis[bis(2-pyridylmethyl)aminomethyl]-4-methylphenol and L is 2-methoxybenzoate (omb), 3-methoxybenzoate (mmb), 4-methoxybenzoate (pmb), 3,5-dimethoxybenzoate (dmb), 3,4,5-trimethoxybenzoate (tmb) or 4-biphenylcarboxylate (bpc). It turns out from the Mössbauer spectra that the valence states of iron atoms of [FeIIFeIII(bpmp)(omb)2](BF4)2, [FeIIFeIII(bpmp)(pmb)2](BF4)2, [FeIIFeIII(bpmp)(tmb)2](BF4)2 and [FeIIFeIII(bpmp)(bpc)2](ClO4)2 are localized at 78 K and delocalized at 293 K. The temperature dependence of the spectra is interpreted by assuming intramolecular electron transfer between two energetically equivalent vibronic states FeAIIFeBIII and FeAIIIFeBII. The Mössbauer spectra of [FeIIFeIII(bpmp)(dmb)2](BF4)2 show the superposition of the relaxation spectrum between iron(II) and iron(III), and of the spectrum of the average valence states at 293 K; the average valence states are partly observed even at 78 K. The valence states of [FeIIFeIII(bpmp)(mmb)2](BF4)2 are localized over the temperature range from 78 K to 293 K. The single-crystal X-ray structure of [FeIIFeIII(bpmp)(bpc)2](ClO4)2 was determined at 293 K. The complex crystallizes in the orthorhombic space group Fdd2, which has a unit cell of a = 27.056(1) Å, b = 42.652(0) Å, c = 12.151(0) Å and Z = 8. A refinement was performed with 2340 unique reflections [I &gt; 3σ(I)] to give R = 0.085, Rw = 0.099. The two iron atoms are located symmetrically to a C2 axis, which presents in the molecule, and are crystallographically equivalent. The mean Fe–O length is intermediate between the FeII–O and FeIII–O values, indicating that both iron atoms are in an averaged valence state.
Synthesis, Characterization and Spin-Crossover Behaviors of [Co(hydroxycarboxylato)(triphos)] Complexes
Authors: Enamullah Mohammed , Hasegawa Miki , Fukuda Yutaka , Linert Wolfgang , Hoshi Toshihiko 
Published: November 2002

Abstract
2,2,2-Tris(diphenylphosphinomethyl)ethane (triphos) coordinates to Co(BF4)2·6H2O to synthesis the red-violet cationic complex of [Co(triphos)(solv)2]2+ (solv: solvent) in THF/EtOH at room temperature. Addition of 2-hydroxy-2-d-carboxylic acids (L) into the cationic solution as co-ligands yields the red-brown complexes of [Co(l-2-hydroxy-2-methylacetato)(triphos)] (I), (Co(d-2-hydroxy-2-phenylacetato)(triphos)] (II), (Co(l-2-hydroxy-2-phenylacetato)(triphos)] (III) and [Co(d-2-hydroxy-2-phenyl-2-methylacetato)(triphos)] (IV). The complexes are characterized by elemental analysis, IR-, UV-vis.-, NMR- and Mass-spectroscopy. All complexes are paramagnetic. Variable temperature studies on magnetic susceptibilities (χM) measurements show the spin-crossover behaviors of the complexes with ΔHsc = −5.3 to −6.8 kJ mol−1 and ΔSsc = −31 to −36 J mol−1 K−1 in methanol.
Metal-Azide-Pyrimidine Complexes M(N3)2(pm) with a Three-Dimensional Network Showing Weak Ferromagnetism for M = Mn and Fe and Antiferromagnetism for M = Co and Ni
Authors: Doi Yoshitaka , Ishida Takayuki , Nogami Takashi 
Published: November 2002

Abstract
Antiferromagnetic phase transitions of M(N3)2(pm) were observed at 51, 39, 41, and 46 K for M = Mn, Fe, Co, and Ni, respectively; here pm denotes pyrimidine. Single-crystal X-ray crystallographic analysis for M = Mn, Fe, and Co and powder X-ray diffraction measurements for M = Ni revealed that they were isomorphous. The N3 and pm moieties contribute μ-1,3-bridged two-dimensional and μ-1,3-bridged one-dimensional structures, respectively, thus forming a three-dimensional framework. Antiferromagnetic couplings through the bridging ligands are consistent with superexchange mechanisms based on the coordination geometry determined. Small spin canting was observed below the transition temperature for M = Mn and Fe. The cant angles are estimated to be 0.06 and 0.13°, respectively, from the spontaneous magnetization at 10 K.
Crystal Structures and Magnetic Properties of Copper(II) Hexafluoroacetylacetonate Complexes with hnn and hin and Manganese(II) Hexafluoroacetylacetonate Complex with hin (hnn = 4,4,5,5-Tetramethylimidazolin-1-oxyl 3-Oxide; hin = 4,4,5,5-Tetramethylimidazolin-1-oxyl)
Authors: Ise Tomoaki , Ishida Takayuki , Nogami Takashi 
Published: November 2002

Abstract
We report here the structures and magnetic properties of hnn and hin complexes with copper(II) and manganese(II) hexafluoroacetylacetonates, [{Cu(hfac)2(H2O)}2(μ-hnn)] (1), [Cu(hfac)2(hin)2] (2), and [Mn(hfac)2(hin)2] (3). X-ray crystallographic analysis of 1 revealed that 1 was a dinuclear complex containing an hnn bridge. Magnetic measurements of 1 indicate the presence of intramolecular ferromagnetic coupling between copper and radical spins. The data were analyzed as a metal-radical-metal three-spin system, giving 2J/k = +16.2 K (H = −2J(S1S2 + S2S3)). The ferromagnetic interaction can be explained in terms of the axial coordination of the hnn nitrogen to Cu(II). Complexes 2 and 3 were revealed to be isomorphous mononuclear complexes possessing two hin ligands. Although the molecules have a radical-metal-radical system, the magnetic data of 3 could not be analysed only with intramolecular interactions. Strong intermolecular antiferromagnetic interactions (2|J|/k &gt;&gt; 300 K) were suggested among the hin ligands because the interatomic O···N distances (2.41–2.51 Å) were shorter than the sum of the van der Waals radii for 2 and 3. These strong interactions are successfully introduced to metal-radical hybrid systems owing to the choice of small ligands, although the complexes do not possess polymeric networks.
Syntheses of a 6-(2-Pyrrolyl)-2,2′-bipyridine Derivative and Its Ruthenium Complex
Authors: Nagata Toshi , Tanaka Koji 
Published: November 2002

Abstract
Syntheses of a new planar terdentate ligand, 6-(3,5-diphenyl-2-pyrrolyl)-2,2′-bipyridine (L1H) and its ruthenium(II) complex ([Ru(L1)2]) are reported. The X-ray structure of [Ru(L1)2] showed the distorted octahedral Ru(II) center similar to the structures of terpyridine complexes. The cyclic voltammograms revealed that [Ru(L1)2] was more easily oxidized than [Ru(terpy)2]2+ by 1.10 V.
Determination of the Rates of Formation and Hydrolysis of the Schiff Bases Formed by Pyridoxal 5′-Phosphate with l-Tryptophan and Its Methyl and n-Butyl Esters
Authors: Gorostidi Gerardo R Echevarría , Santos José G , Basagoitia Andrea , Blanco Francisco García 
Published: November 2002

Abstract
The apparent rate constants of the formation (k1) and hydrolysis (k2) of the Schiff bases formed by pyridoxal 5′-phosphate with l-tryptophan and their methyl and n-butyl esters at a variable pH, 25 °C, and an ionic strength of 0.1 M were determined, along with the equilibrium constant (KpH). The individual rate constants of formation and hydrolysis of the Schiff bases of systems corresponding to different chemical species present in the medium as a function of its acidity were also determined, as were the pK values for the Schiff bases. The influence of the α-carboxyl group on the formation and hydrolysis constants of the Schiff bases, and also on their pK values, is demonstrated.
Epimerization in Intramolecular Carbanilide Cyclization to Hydantoins: A Computational Study
Authors: Gong Young-Dae , Kim Soo-Kyung , Yoo Sung-eun , Kurth Mark J 
Published: November 2002

Abstract
An efficient and diastereoselective route for the synthesis of 2,5,6,7-tetrasubstituted-1H-pyrrolo[1,2-c]imidazoles has been developed using intramolecular azomethine ylide cycloaddition and carbanilide cyclization. Ab initio calculations at the 6-31G (d,p) basis set reveal that the thermal stability of diastereomers determine the epimerization during the intramolecular carbanilide cyclization (→ hydantoin). These stereochemical results are consistent with an endo-like cycloaddition of a trans,anti-azomethine ylide followed by base-mediated C7a-H epimerization (C7a-Hβ → C7a-Hα) to deliver the thermodynamically preferred trans,anti,trans-(Ha-Hb, Hb-Hc, Hc-Hd)-pyrrolidine stereochemistry (3) which is ca. 20.1 kJ/mol more stable than the trans,anti,cis-pyrrolidine stereochemistry. In the case of 2-hydroxy-1-naphthaldehyde, naphthalene ring steric effects result in a different stereochemical arrangement about each pyrrolidine ring.
A Convenient Synthesis of 2H-1,4-Benzoxazines, 3H-Indol-3-ones, and 2,3-Dihydrobenzoxazoles
Authors: Abdou Wafaa Mahmoud , Salem Mounir Abdou Ibrahim , Sediek Ashraf Ahmed 
Published: November 2002

Abstract
3,5-Di-tert-butyl-1,2-benzoquinone 1-oxime (1b) reacted with ester ylides 2a,b to give the corresponding 2H-1,4-benzoxazin-2-ones 9a,b along with the 3H-indol-3-one 11, whereas with keto ylides 12a,b, 2,3-dihydrobenzoxazoles 13a,b were isolated. Conversely, the reaction of 1b with moderated phosphonium salt 15 proceeded under phase-transfer catalysis conditions to afford the 2H-1,4-benzoxazine derivative 19, instead of the expected Wittig reaction product.