bluuebunny/crossref_metadata_2025_split huggingface dataset:
Structure and Properties of Non-Classical Polymers. XI. Heteroatomic Analogues of Poly(1,3-phenylenemethylene)’s
Authors: Tyutyulkov Nikolai , Dietz Fritz , Müllen Klaus , Kübel Christian 
Published: June 2006

Abstract
The magnetic properties of a new class of high-spin organic 1-D polymers were studied theoretically. The polymers have the same topology as poly(1,3-phenylenemethylene)s (PMP) and are derived from the latter by substitution of the exocyclic radical center –C•R– by –B•−R–, –N•–, –N+•H–, –O+•– or –S+•–. All of these polymers possess a narrow half-filled band (HFB) within the energy gap. The nature of spin-exchange interactions of π-electrons within the HFB has been investigated. The three components of the effective exchange integral, Jeff, in the Heisenberg Hamiltonian representing the potential (direct), kinetic and exchange (due to the spin polarization—indirect exchange) interaction of the π-electrons in the HFB were calculated. In all cases, the potential (Coulomb) exchange was the main contribution to the ferromagnetic (Jeff &gt; 0) exchange interaction.
Ab Initio Molecular Orbital Study of the Benzene–Chlorine Complex
Authors: Matsuzawa Hidenori , Osamura Yoshihiro 
Published: June 2006

Abstract
The geometrical structures and stabilization energies of benzene–chlorine complex were studied theoretically using an ab initio molecular orbital method. Full geometry optimization was carried out for four models ((1) [On Center (C6v symmetry)], (2) [On Atom (Cs symmetry)], (3) [On Bond (Cs symmetry)] and (4a,b) [Resting (Cs symmetry)]) with restricted Hartree–Fock (RHF) and second-order Møller–Plesset perturbation (MP2) methods, MP2 (Frozen), and MP2 (Full), using various basis sets. The RHF method is not good enough to describe the molecular structure and interaction energy of the complex. The geometry obtained with the MP2/DZP + d method has good agreement with the X-ray crystal structure. An unusual basis set superposition error (BSSE) was found when the MP2 method with a frozen-core approximation was applied to evaluate the interaction energy. In the MP2 (Full) method, in which the inner-core wavefunctions was correlated, the reasonable stabilization energy is obtained. The BSSE-corrected interaction energies (ΔE(corr.)) of models(1), (2), and (3) are −6.63, −8.44, and −8.14 kJ mol−1, respectively. The most stable structure of the benzene–chlorine complex was calculated to be model (2). Model (3) lies at only 0.3 kJ mol−1 higher energy than model (2) in the MP2(Full)/DZP + d calculation. The position of chlorine would be very flexible on the benzene ring, and the molecular structure of the complex is easily interchangeable between models (2) and (3).
A Completely Inorganic BZ-Type Oscillator in a Closed Homogeneous System
Authors: Li Hexing , Shen Chun 
Published: June 2006

Abstract
In a batch reactor, an absolutely homogeneous inorganic Belousov–Zhabotinskii (BZ)-type oscillator has been designed in the system of BrO3−–H2PO2−–Mn2+–Fe(phen)32+–H2SO4. The oscillations of both [Br−] and [Mn3+]/[Mn2+] as well as [Fe(phen)33+]/[Fe(phen)32+] were observed by monitoring the changes of either the potential on a bromide electrode or the absorbance at the maximum absorbance wavelength for Mn3+ and Fe(phen)33+, respectively. Both of those two metallic ions are essential in the present system to give rise to the oscillations; their roles in the oscillation are discussed. It is found that Mn2+ can not be replaced by other substances, while Fe(phen)32+ can be replaced by either N2 flow or acetone. However, it can not be replaced by other metallic ions, including Mn2+ and Ce3+. Those results suggest that Mn2+ is the real oscillating catalyst for an autocatalytic formation of HBrO2 and Fe(phen)32+ is a catalyst for the catalytic reduction of Br2 by H2PO2− to remove any excess Br2 produced during the oscillations.
Pulsed Electric Linear Dichroism of Poly(dA)·Poly(dT)·Poly(dT) and Poly(rA)·Poly(rU)·Poly(rU) in Solutions
Authors: Ojima Noriyuki , Gekko Kunihiko , Yamaoka Kiwamu 
Published: June 2006

Abstract
The dependence of reduced dichroism (Δε/ε) of sonicated rodlike title triplexes with the counterion Mg2+, (dA)n·(dT)n·(dT′)n and (rA)n·(rU)n·(rU′)n, on the wavelength (190—300 nm) and on the applied-field strength (3.8—23.1 kV cm−1) was studied in aqueous ionic solutions at 7 °C. The sonicated samples were fractionated and well-characterized by the gel-permeation chromatography/low-angle laser light-scattering method. The reduced dichroism saturated at infinitely high electric fields ((Δε/ε)s) was estimated to be −1.22 for (dA)n·(dT)n·(dT′)n and −1.09 for (rA)n·(rU)n·(rU′)n, by fitting the observed Δε/ε values at 260 nm to a theoretical orientation function. The electric linear dichroism (ELD) spectra, i.e., the dependence of (Δε/ε)s on the wavelength, of (dA)n·(dT)n·(dT′)n and (rA)n·(rU)n·(rU′)n were determined. The measured ELD spectra were simulated by assigning the appropriate roll (θR) and tilt (θT) angles to the constituent bases. The most probable θR and θT values, determined for each triplex, indicate that the structures of triple helices both belong to an “A-form” family. The constituent bases in base-triple do not lie on a common plane. From an analysis of transient decay signals, the translation per base-triple (h) was estimated for each triplex. The structures of the present high molecular-weight triple-stranded helices in aqueous solution were determined for the first time and the plausible structural models were constructed from the experimentally evaluated sets of θR and θT.
Characterization of Dimeric Copper(II) Trichloroacetate Complexes by Electron Spin Resonance, Infrared, and Electronic Reflectance Spectra. Correlation of Spectral Parameters with Molecular Geometry
Authors: Muto Yoneichiro , Horie Hiroshi , Tokii Tadashi , Nakashima Michio , Koikawa Masayuki , Steward Omar W , Ohba Shigeru , Uekusa Hidehiro , Husebye Steinar , Suzuki Ikuo , Kato Michinobu 
Published: June 2006

Abstract
ESR, IR, and electronic reflectance spectral data are presented for dimeric (trichloroacetato)copper(II) complexes, of which magneto-structural data are available: The larger is the distortion of the coordination geometry from square pyramidal (SP) toward trigonal bipyramidal (TBP), the longer is the Cu···Cu distance in the dimers. The elongation of the Cu···Cu distance is accompanied by a reduction of the zero-field splitting parameter (D), the anisotropic exchange parameter (Dex), and the peak separation of the two peaks in the electronic spectra (). The splitting of the carboxylato stretching frequencies, , increases with the distortion. Good linear correlations have been observed between the values of these parameters and the Cu···Cu distances. The axial ESR spectra with g// &gt; g⊥ and the electronic spectra suggest that the ground state of the Cu atom is essentially dx2 − y2, even in the metal geometry of the greatest distortion toward TBP (the z-axis is along the longest Cu–O bond).
Formation of Di- and Tricarbonylruthenium(O) Species from [RuH2(CO)(PPh3)3] via Decarbonylation of Methyl Benzoates: X-Ray Crystal Structures of [Ru(CO)2(PPh3)3] and [Ru(O2)(CO)2(PPh3)2]
Authors: Hiraki Katsuma , Kira Shu-ichi , Kawano Hiroyuki 
Published: June 2006

Abstract
Dihydridoruthenium(II) complex [RuH2(CO)(PPh3)3] (1) reacts with methyl benzoate in the presence of an olefin at 110 °C to afford some dicarbonylruthenium(O) species [Ru(CO)2(PPh3)3] (2) and “Ru(CO)2(PPh3)2L” (L = the olefin or the ester). A tricarbonylruthenium(O) complex [Ru(CO)3(PPh3)2] (3) is formed at higher reaction temperature. The experiment using 13C-enriched methyl benzoate reveals that the second and the third carbonyl ligands are mainly derived by subtraction of the carbonyl group from the ester. When the reaction is carried out in the presence of triethoxyvinylsilane, a part of the second and the third carbonyl groups is derived from the ethoxy group of the silane, because 1 reacts with the silane at 110 °C in the absence of the ester to afford 2 and 3. The formation ratio of 2 and 3 is affected by the type of olefins used; selective formation of 2 and 3 is achieved when triethoxyvinylsilane is used, whereas allylbenzene or cyclooctene affords merely a mixture of the di- and tricarbonyl species. The reaction mixture containing 2 and “Ru(CO)2(PPh3)2L” is exposed to air to give a peroxo complex [Ru(η2-O2)(CO)2(PPh3)2] (4) smoothly. The molecular structures of 2 and 4 are determined by the single crystal X-ray diffraction method. The complex 2 has a distorted trigonal bipyramidal coordination geometry with two equatorial CO ligands, whereas the complex 4 has a distorted octahedral structure.
Variable-Temperature and -Pressure Nitrogen-14 Magnetic Resonance Studies on Solvent Exchange of Nickel(II), Iron(II), and Manganese(II) Ions in Neat 1,3-Propanediamine and n-Propylamine
Authors: Aizawa Sen-ichi , Iida Shigeo , Matsuda Kayoko , Funahashi Shigenobu 
Published: June 2006

Abstract
The solvent exchanges of nickel(II), iron(II), and manganese(II) ions in 1,3-propanediamine (tn) and n-propylamine (pa) have been studied by the 14N NMR line-broadening method. The rate constants of the amine exchanges for the first-row transition metal ions are in the order of ethylenediamine (en) &lt; tn &lt; pa, which is largely affected by the difference in the activation enthalpies. The differences in the rate constants and the activation enthalpies among the three amine solvents become greater along the series from manganese(II) ion to nickel(II) ion. These kinetic results have clarified that the differences in the kinetic chelate strain effect in the transition state and the chelate strain effect in the ground state can be attributed to the difference in the chelate ring sizes and the ion radii.
Valence Isomerization. Synthesis and Characterization of Cobalt and Nickel Complexes with Non-Innocent N2S2 Ligand
Authors: Kawamoto Tatsuya , Kuma Hiro , Kushi Yoshihiko 
Published: June 2006

Abstract
The reactions of 2-phenylbenzothiazoline with [M(CH3COO)2]·4H2O (M = Co(II) and Ni(II)) afford the complexes [M(phbt)2 ] (phbt = 2-(phenylmethyleneamino)benzenethiolato) via a ring opening reaction of 2-phenylbenzothiazoline. Spectroscopic data indicate that the cobalt and nickel atoms occupy a tetrahedral and a square planar N2S2 environment, respectively. The single crystal X-ray structure of [Ni(phbt)2] is redetermined and this complex shows a monohelical geometry. Crystal data: [Ni(phbt)2], monoclinic, C2/c, a = 23.065(4); b = 6.924(2); c = 13.809(2) Å; β = 102.64(1)°; V = 2152.0(9) Å3; Z = 4, R = 0.052 (Rw = 0.050). The toluene solution of [Co(phbt)2] and that of [Ni(phbt)2] lead to the complexes [Co(ddbt)] and [Ni(ddbt)] (ddbt = bis-2,2′-(1,2-diphenylethylenediimine)benzenethiolato) through the carbon–carbon bond formation, respectively. The structural features of [M(ddbt)] (M = Co and Ni) point clearly to the neutral dithiolene-like charge distribution. These complexes [M(ddbt)] have the same chemical compositions as the starting complexes [M(phbt)2], and both can be correlated in a new valence isomerism. Crystal data: [Co(ddbt)], monoclinic, P21/n, a = 8.573(2); b = 24.486(3); c =10.771(1) Å; β = 102.08(2)°; V = 2211.0(9) Å3; Z = 4, R = 0.056 (Rw = 0.048); [Ni(ddbt)], monoclinic, P21/n,a = 8.631(10); b = 24.365(19); c = 10.798(4) Å; β = 102.69(6)°; V = 2215.2(33) Å3; Z = 4, R = 0.078 (Rw = 0.075).
Performance and Characterization of a [PtMo6]/MgO Catalyst: The Catalytic Activity for NO–CO Reactions and Structural Analysis by EXAFS
Authors: Tomishige Keiichi , Nagasawa Yosuke , Lee Uk , Iwasawa Yasuhiro 
Published: June 2006

Abstract
The catalytic property of a [PtMo6]/MgO catalyst prepared by using a [PtMo6O24]8− precursor for NO–CO reactions and a structural analysis by means of Pt L3- and Mo K-edge EXAFS spectroscopy was studied. The catalytic activity of the bimetallic ensemble catalyst appeared due to the incorporation of Pt ions into the MgO surface, where Pt4+ ions substituted Mg2+ ions in the first layer of the MgO surface. It seems that the NO–CO reaction proceeded on the Pt sites embedded in the MgO surface by a redox mechanism, whereas metallic Pt particles on MgO were inactive under the present reaction conditions, characterized by an in-situ EXAFS analysis.
Friedel–Crafts Transannular Alkylation of Benzene with (Z,Z)-1,5-Cyclooctadiene: Reassignment of Two Phenylbicyclooctanes by 13C NMR Spectroscopy and Separate Preparation
Authors: Tateiwa Jun-ichi , Uemura Sakae 
Published: June 2006

Abstract
Our previous structure assignment of two phenylbicyclooctanes obtained in Friedel–Crafts transannular alkylation of benzene with (Z,Z)-1,5-cyclooctadiene has been reinvestigated and partly corrected on the basis of 13C NMR spectral data, a separate preparation of an authentic sample, and MM3 calculation. The compounds assigned previously to exo-3-phenyl-cis-bicyclo[3.3.0]octane and exo-3-phenylbicyclo[3.2.1]octane among six products should be assigned to 1-phenyl-cis-bicyclo[3.3.0]octane and exo-3-phenyl-cis-bicyclo[3.3.0]octane, respectively, showing that almost all products have bicyclo[3.3.0]octane framework. A new preparative method for an authentic 1-phenyl-cis-bicyclo[3.3.0]octane and MM3 calculations of all products are also presented.
Synthesis of Functionalized 4H-Pyrano[3,2-c]pyridines from 4-Hydroxy-6-methyl-2-pyridone and Their Reactions. Unexpected New Routes to 3,3′-Benzylidenebis[4-hydroxy-6-methyl-2(1H)-3-pyridinone]s
Authors: Mekheimer Ramadan Ahmed , Mohamed Nabil Helmi , Sadek Kamal Usef 
Published: June 2006

Abstract
The reaction of 4-hydroxy-6-methyl-2-pyridone 1 with benzylidenemalononitriles in an ethanolic solution containing a catalytic amount of piperidine and α-cyanoacrylic esters in pyridine affords the corresponding 4H-pyrano[3,2-c]pyridines. However, it’s reaction with 3-(cyanomethylene)-2-indolinones gives either 2-amino-3-quinolinecarbonitriles or ethyl 2-amino-5′,6′-dihydro-7′-methyl-2,5′-dioxospiro-[indoline-3,4′-[4H]-pyrano[3,2-c]pyridine-3′-carboxylate. In contrast, the reaction of 1 with 3-aryl-2-cyano-2-propenethioamides affords 3,3′-benzylidenebis[4-hydroxy-6-methyl-2(1H)-3-pyridinone]s. The reaction of the obtained 4H-pyrano[3,2-c]pyridines with acetic anhydride affords the corresponding fused system.
A New Type of φ, ψ Representation of the Protein Tertiary Structure and the Analysis of the Amino Acid Preferences for Specific Locations at Type-II β-Turn by Using 8000 Possible Kinds of Amino Acid Residues
Authors: Narita Mitsuaki , Sode Koji , Ohuchi Shokichi , Hitomi Mitsuo , Murakawa Yuka 
Published: June 2006

Abstract
φ, ψ Representations of three-dimensional structures of 125 globular proteins were depicted for analyzing conformational details in their secondary and tertiary structures. They can be drawn in the form of a two-dimensional diagram. The new type of representation of the protein tertiary structure can be used as a stereotyped finger printing for 125 protein molecules. It is powerful for a precise comparison of the relationship of the primary, secondary, and tertiary structures of homologous proteins. The precise or broad similarity between the patterns of proteins classified into the same family is obvious. This representation is also useful in readily recognizing all of the secondary structures as one progresses along the chain. Complicated three-dimensional structures of 125 globular proteins are easily recognized to be built up from only four secondary structures: helix, β-strand, β-turn, and unordered structure. A combination of intersegments hydrogen bonds among β-strands was also shown in the diagram. In order to demonstrate the usefulness of the diagram, 195 type-II β-turns were extracted from 125 proteins using the new type of two-dimensional φ, ψ diagrams. Their amino acid sequences were surveyed so as better to understand amino acid preferences previously observed. For their analysis, a normalized preference (NP) value of an amino acid residue at a particular position of the secondary structure is defined as the ratio of the average percentage composition at the position based on average percentage composition at large. The statistical significance of the NP-value used in this study is more simple and clearer than that of the d-test based on a normal distribution, which was used in the previous study. It is clearly shown that a high NP-value (5.0) of a single P residue for the position i + 1 of the type-II β-turn is an average preference of a variety of P residues in the middle of triplets consisting of consecutive amino acid residues. The NP-values of P residues, in the middle of 25 particular triplets are outstandingly high. Out of 400 possible P residues 322 kinds of P residues were found in 125 proteins. A remarkable high NP-value (8.8) of a single G residue for the position i + 2 is also an average preference of G residues in the middle of various triplets.
Side-Chain Liquid-Crystalline Polyoxetanes with a Spacer-Separated Azobenzene Moiety. III. Preparation and Characterization of Polyoxetanes Anchoring the Mesogen Cores of a p-Spacer-Substituted Phenyl 4-(4-Alkoxyphenylazo)benzoate in the Side Chain
Authors: Ogawa Hiroshi , Kanoh Shigeyoshi , Motoi Masatoshi 
Published: June 2006

Abstract
Polyoxetanes anchoring the mesogen cores of p-spacer-substituted phenyl 4-(4-alkoxyphenylazo)benzoates through a pendant spacer, –CH2O(CH2)4O–, were prepared by a BF3-initiated cationic ring-opening polymerization of the corresponding oxetanes, followed by a fractional reprecipitation of the raw polymer products containing oligomer fractions. The polyoxetanes separated from the oligomers had their peak tops at molecular weights of around 10000—23000 in nearly mono- or dimodal molecular-weight dispersity curves determined by gel permeation chromatography, and indicated fan-shaped textures due to a smectic mesophase over a wide temperature range from about 250 °C to room temperature on heating and cooling processes by polarized optical microscopy. The formation of highly ordered assemblies of the pendant mesogens is ascribable to a cohesion of the 4-(4-alkoxyphenylazo)benzoate moiety in the mesogen core, which can form a larger dipole, due to forming a longer conjugated system from the ester carbonyl to the alkoxy tail, than that of the simple 4-alkoxybenzoate moiety of the mesogen core previously reported by us.
Laser-Flash Photolysis in High-Speed Photopolymer Coating Layers Containing Carbonylbiscoumarin Dyes and 2,2′-Bis(2-chlorophenyl)-4,4′,5,5′-tetraphenyl-1,1′-bi-1H-imidazole
Authors: Urano Toshiyuki , Nagasaka Hideki , Shimizu Shigeki , Ito Hiroto , Shimizu Makoto , Takahara Shigeru , Yamaoka Tsuguo 
Published: June 2006

Abstract
The sensitization mechanisms of ketocoumarin dyes with a radical-generating reagent (10,10′-carbonylbis[1,1,7,7-tetramethyl-2,3,6,7-tetrahydro-1H,5H,11H-[1]benzopyrano[6,7,8-ij]quinolizin-11-one] (KCD-J), 3,3′-carbonyldis[7-(diethylamino)-2H-1-benzopyran-2-one] (KCD-DA)) with 2,2′-bis(2-chlorophenyl)-4,4′,5,5′-tetraphenyl-1,1′-bi-1H-imidazole (BI) in a poly(methyl methacrylate) (PMMA) film have been investigated by laser-flash photolysis using a total-reflection cell. The triplet decay time of the dyes in a PMMA film was quenched by BI with a kqs of 1.3 and 0.60 × 105 mol dm−3 s−1 for KCD-J and KCD-DA. The fluorescence and initial absorption for KCD-DA were not quenched by BI in a PMMA film. The fluorescence was quenched at a quenching distance of 10.0 Å, and the initial triplet absorption was not quenched for KCD-J in a PMMA film.
These results show that a nonstatic sensitization from the triplet to BI is the predominant process in a photoinitiation system containing KCD-DA, and that both static sensitization from the singlet excited state to BI and nonstatic sensitization from the triplet to BI exist in a photoinitiation system containing KCD-J.
The Direct Iodination of Arenes with Chromium(VI) Oxide as the Oxidant
Authors: Lulinski Piotr , Skulski Lech 
Published: June 2006

Abstract
An easy and cheap laboratory method is presented for the direct mono- and diiodination of a number of activated and deactivated arenes. The main iodination reactions occurred at the temperatures not exceeding 65 °C for 0.5—12 h in the anhydrous, strongly acidic liquid system, I2/AcOH/Ac2O/H2SO4, in the presence of prior dissolved CrO3 used as the oxidant. The yields of the pure iodinated products varied from 31% (for 3,5-diiodobenzoic acid) up to 90% (for 4-iodoanisole). So far, benzonitrile and some oxidizable aromatics, e.g. naphthalene, fluorene, xanthene, and thiophene, have been found to be unsuitable for the effective iodination. Nevertheless, this novel, simple method of direct iodination is worthy to be extended to other appropriate aromatics.
Regioselective Robinson Annulation Realized by the Combined Use of Lithium Enolates and Aluminum Tris(2,6-diphenylphenoxide) (ATPH)
Authors: Saito Susumu , Shimada Itsuro , Takamori Yusuke , Tanaka Michiaki , Maruoka Keiji , Yamamoto Hisashi 
Published: June 2006

Abstract
Michael addition of lithium enolates derived from ketones to a variety of α,β-unsaturated ketones was realized in the presence of aluminum tris(2,6-diphenylphenoxide) (ATPH). In this reaction, ATPH can be used as a carbonyl protector of α,β-unsaturated carbonyl substrates upon complexation, which facilitates the regioselective 1,4-addition of lithium enolates to Michael acceptors. Similarly, dianions of β-dicarbonyl compounds undergo Michael addition smoothly using ATPH as an effective promoter of the reaction. Subsequent regioselective, intramolecular aldol condensation was also demonstrated, leading to bicyclic carbon ring systems. Such systems are difficult to obtain by the Robinson annulation usually performed in protic media.
Enantioselective Addition of Diethylzinc to Aldehydes Catalyzed by (S)-2-(N,N-Disubstituted aminomethyl)pyrrolidine
Authors: Asami Masatoshi , Inoue Seiichi 
Published: June 2006

Abstract
The enantioselective addition of diethylzinc to aldehydes in the presence of a catalytic amount of several chiral diamines, (S)-2-(N,N-disubstituted aminomethyl)pyrrolidines, was studied. Relatively high selectivity was achieved in the case of aromatic aldehydes by employing 15 mol% of (S)-2-(1-pyrrolidinylmethyl)pyrrrolidine.
Single-Step Acylation of Polyester Terminals by Enzymatic Ring-Opening Polymerization of 12-Dodecanolide in the Presence of Acyclic Vinyl Esters
Authors: Uyama Hiroshi , Kikuchi Hirofumi , Kobayashi Shiro 
Published: June 2006

Abstract
Enzymatic ring-opening polymerization of a 13-membered lactone, 12-dodecanolide (DDL), was performed in the presence of acyclic esters in bulk by using lipase catalyst. The acyl group was introduced at the terminal by adding a fatty acid vinyl ester. Effects of the chain length and concentration of the vinyl ester on the introduced ratio (functionality) and molecular weight of the polymer have been examined. The quantitative acylation of the terminal was achieved by using lipases derived from Pseudomonas family under appropriate reaction conditions. Methacryl- and ω-alkenyl-type polyester macromonomers were synthesized by the polymerization of DDL in the presence of vinyl methacrylate and vinyl 10-undecenoate, respectively. This process could be extended to single-step synthesis of polyester telechelics. The polymerization in the presence of divinyl sebacate produced a telechelic polymer having a carboxylic acid group at each end. In using a fatty acid ethyl ester or an acetic acid alkyl ester as additive, on the other hand, the quantitative introduction of the corresponding acyl group was not achieved.
One-Pot Synthesis of 4-Amino-1,2-dihydro-3-quinolinecarboxylic Acid Derivatives
Authors: Kobayashi Kazuhiro , Takabatake Harumi , Kitamura Tomohide , Morikawa Osamu , Konishi Hisatoshi 
Published: June 2006

Abstract
When 2-(methylamino)benzonitrile was treated successively with magnesium bis(diisopropylamide), generated in situ from the reaction of ethylmagnesium bromide and diisopropylamine, and α,β-unsaturated carboxylic acid esters in diethyl ether at 0 °C, conjugate addition and enolate–nitrile coupling proceeded sequentially to give the corresponding 4-amino-1,2-dihydro-3-quinolinecarboxylates in isolated yields ranging from 36 to 79%.