bluuebunny/crossref_metadata_2025_split huggingface dataset:
Kinetic Study for Reactions of Nitrate Radical (NO3·) with Alcohols in Solutions
Authors: Ito Osamu , Akiho Seiji , Iino Masashi 
Published: July 2006

Abstract
The rate constants for the reaction of nitrate radical (NO3·) with alcohols have been determined by flash photolysis method in aqueous and nonaqueous solutions. The reactivity of NO3· in acetonitrile was higher than that in aqueous solution, suggesting that hydrogen bonds between solvent and NO3· or alcohols decrease the reaction rate. From the deuterium-isotope effect, the main reaction path was confirmed to be hydrogen atom abstraction from the carbon atom bonded with the OH group. For 2-methyl-2-propanol, the hydrogen atom abstraction from the OH group was presumed. These reaction paths were confirmed, since the reaction rate constants decreased with an increase in the corresponding bond-dissociation energies. From strong dependency of the rate constants upon the ionization energies of alcohols, the polar transition states of the reactions were suggested.
Facile Synthesis of AM-Toxin II
Authors: Ueda Kazuo , Waki Michinori , Teruya Yoshio , Izumiya Nobuo 
Published: July 2006

Abstract
In a search for a more effective synthetic route for AM-toxins (cyclic tetradepsipeptides), the syntheses of [l-Phe3]AM-toxin II as a preliminary peptide and AM-toxin II as a target were attempted. The cyclization of H–l-Ser(Bzl)-l-Ala–l-Hmb–l-Phe–ONSu (Hmb, 2-hydroxy-3-methylbutanoic acid) in pyridine gave a cyclic monomer in high yield (59%). The removal of O-Bzl in the cyclopeptide and a subsequent dehydration of Ser with carbodiimide–CuCl afforded [l-Phe3]AM-toxin II in 24% yield. AM-Toxin II was synthesized in similar yield as in the case of the analog. The characteristic features of synthetic AM-toxin II were identical to those of the natural one.
Quantitative Mapping of Metal-Centered Dipolar Field in Hemin Dicyano Complex by Solution NMR
Authors: Yamamoto Yasuhiko , Nanai Norishige , Inoue Yoshio , Chûijô Riichirô 
Published: July 2006

Abstract
The metal-centered pseudo-contact shift contribution in the hyperfine shift of NMR resonance of paramagnetic hemin dicyano complex ([FeIII(proto)(CN)2]) in solution was quantitatively determined from the combined use of 1H and 13C NMR data. Taking advantage of the axially symmetric magnetic property for [FeIII(proto)(CN)2] in solution, the paramagnetic metal-centered dipolar field was quantitatively mapped. The highly solvent-dependent magnetic anisotropy, (g2⁄⁄–g2⊥), of this complex in CD3OD was estimated to be 7.2 and the obtained value is placed between the values in D2O (4.4) and in CDCl3 (9.7).
Anomalous Peak Intensities in the EXAFS of Polynuclear Molybdenum Compounds
Authors: Miyanaga Takafumi , Fujikawa Takashi , Matsubayashi Nobuyuki , Fukumoto Takao , Yokoi Kunihiko , Watanabe Iwao , Ikeda Shigero 
Published: July 2006

Abstract
EXAFS (Extended X-ray Absorption Fine Structure) experiments on various polynuclear molybdate and tungstate compounds revealed the unusual phenomenon that Mo–O peaks which should appear at around 1.9 Å in Fourier transforms of the EXAFS spectra for Mo6O192− and PMo12O403− are hardly discernible, while the tungstates and other molybdates give the metal–oxygen peaks normally. It is concluded that the Debye–Waller factors for the metal-bridging oxygen bonds in Mo6O192− and PMo12O403− are exceptionally large (≥0.08 Å). The shape of the Raman bands for the Mo6O192− pertaining to the vibration involving the bridging oxygens supports the large σ values estimated. EXAFS measurements were also performed for AsMo12O403−, SiMo12O404−, and PMo12O403−. The compounds with large Debye–Waller factors seem to be unstable against reductants.
Studies of the Hydrous Silicon(IV)–Titanium(IV) Oxide Ion Exchanger. I. A Method of Synthesis and Some Properties
Authors: Yamazaki Hiromichi , Kanno Yasuhito , Inoue Yasushi 
Published: July 2006

Abstract
Hydrous silicon(IV)–titanium(IV) oxide ion exchanger was prepared by using TiCl4 and Na2SiCO3 solutions. From a detailed examination of the dependency of the compositions and the acid–base properties of the products on the conditions for precipitation, a reproducible synthetic procedure was established. The exchangers with 37 to 67 mol% of titanium to metallic elements possess much larger ion-exchange capacities and are more stable to highly alkaline solutions than simple mixtures of hydrous silicon(IV) oxide and hydrous titanium(IV) oxide. The dependency of the ion-exchange capacity on the composition can be explained by the difference in the structure of the matrix as evidenced from the thermal analysis, X-ray diffraction, and infrared absorption studies.
Preparation of Superconductive Films by Fume Pyrolysis
Authors: Ogawa Takao , Yamada Seiji , Miki Takeshi , Tsuiki Hideyasu , Kakuta Noriyoshi , Ueno Akifumi , Suzuki Yasuji , Koyama Kuniyuki , Noguchi Seiichiro , Yamada Mamoru 
Published: July 2006

Abstract
Superconductive films composed of Ba2YCu3O7−δ were prepared by fume pyrolysis with a temperature programmed electric furnace. Fumes generated from an aqueous solution of Ba, Y, and Cu nitrates with an aid of supersonicant were introduced into the furnace with flowing O2. Fine particles consisting of Ba, Y, and Cu ions were formed in the furnace and deposited on the surface of a YSZ substrate placed at the top of the furnace. Films thus prepared and annealed at 1273 K showed superconductive properties below 90 K and zero resistivity was observed at 80 K with 100 μA of the current.
On the Reaction of N-Vinyliminophosphoranes. 9. The Synthesis and Reaction of N-(1,3,5-Cycloheptatrienyl)iminophosphoranes to Provide a Novel Route to 1-Azaazulenes
Authors: Iino Yukio , Hara Eijiro , Nitta Makoto 
Published: July 2006

Abstract
The first syntheses of N-(2,4,6-cycloheptatrienyl)iminophosphoranes (3a, b) and their thermal conversion to N-(1,3,5-cycloheptatrienyl)iminophosphoranes (5a,b) have been studied. The kinetic study of the 1,5-hydrogen migration of 3a,b to N-(1,3,6-cycloheptatrienyl)iminophosphoranes (4a,b) has also been investigated. The reaction of 5b with α-bromoacetophenone derivatives has provided a novel route to the 1-azaazulene ring system, albeit in low yields.
The Selective Claisen and Dieckmann Ester Condensations Promoted by Dichlorobis(trifluoromethanesulfonato)titanium(IV)
Authors: Tanabe Yoo 
Published: July 2006

Abstract
Inter and intramolecular condensations (the Claisen and the Dieckmann condensations) between ester functions have been performed by the combined use of dichlorobis(trifluoromethanesulfonato)titanium(IV) (= dichlorobis(triflato)titanium(IV)) and tertiary amine under mild reaction conditions. These results led to the development of the selective (crossed) Claisen and Dieckmann ester condensation between methoxymethyl ester and methyl ester, in that, dichlorobis(triflato)titanium(IV) contribute to control the direction of the reaction.
High-Resolution Nuclear Magnetic Resonance Study of 6-O-α-d-Glucopyranosyl-α-cyclodextrin-p-Nitrophenol Inclusion Complex in Aqueous Solution
Authors: Kanda Yoshihiro , Yamamoto Yasuhiko , Inoue Yoshio , Ch\ {u}j\ {o} Riichirô , Kobayashi Shôichi 
Published: July 2006

Abstract
6-O-α-d-Glucopyranosyl-α-cyclodextrin (G1-α-CD)-p-nitrophenol (pNP) inclusion complex has been characterized by high resolution 1H and 13C NMR. From 1H NMR measurements it is concluded that G1-α-CD forms a 1 : 1 inclusion complex with pNP at both pD 7 and 10, and the dissociation constants for their complexation are quite similar to those for α-CD–pNP complexation, suggesting that G1-α-CD and α-CD have a similar ability of complexation with pNP. The geometry of G1-α-CD–pNP complex was found to be similar to that of α-CD–pNP complex. Analysis on the NMR spectral parameters of G1-α-CD have revealed that the asymmetric nature of G1-α-CD molecule is enhanced by complexation with pNP.
No Electron-Donating Substituent Effect on the Singlet Excited State Formation from the 5-(5-Aryl-2-pyrazinylamino)-1,2,4-trioxanes in Dimethyl Sulfoxide Triggered by Potassium t-Butoxide
Authors: Teranishi Katsunori , Goto Toshio 
Published: July 2006

Abstract
5-(5-Phenyl-2-pyrazinylamino)-1,2,4-trioxane derivatives having a substituent on the 4 position of the phenyl group gave chemiluminescence in dimethyl sulfoxide by addition of potassium t-butoxide. No electron-donating substituent effect was observed on the yield of singlet excited state formation. This may be explained by the negative charge formed on the nitrogen atom next to the transient dioxetane moiety, which may produce singlet excited-state molecule by the intramolecular CIEEL mechanism.
ENDOR Studies of the Complexation Reaction between Spin-Labeled Crown Ether and Alkali Metal Salts
Authors: Tajima Kunihiko , Miyoshi Masanao , Furutani Masahiro , Fujimura Yasushi , Mukai Kazuo , Ishizu Kazuhiko 
Published: July 2006

Abstract
A new crown ether spin-labeled by the phenoxyl radical moiety was prepared. Intramolecular odd-π electron delocalization was investigated by means of ENDOR spectroscopy. On the basis of ENDOR spectrometric titration, the equilibrium constant for Na+-labeled crown-ether-complex formation was evaluated to be pKNa+=3.5 in 2-propanol at −30 °C.
Halogenation Using Quaternary Ammonium Polyhalides. XIX. Aromatic Chlorination of Arenes with Benzyltrimethylammonium Tetrachloroiodate
Authors: Kajigaeshi Shoji , Ueda Yasuhiro , Fujisaki Shizuo , Kakinami Takaaki 
Published: July 2006

Abstract
The reaction of arenes with a calculated amount of benzyltrimethylammonium tetrachloroiodate ir acetic acid at room temperature or at 70 °C gave nuclear chloro-substituted arenes in fairly good yields.
Formation of Furan Derivatives from Phenacyl Bromides and Sodium Telluride; Attempted Extension to Coumarin Synthesis
Authors: Padmanabhan Seetharamaiyer , Ogawa Takuji , Suzuki Hitomi 
Published: July 2006

Abstract
The enolates, generated from phenacyl bromides by sodium telluride, yield 2,4-diarylfurans in addition to the expected dehalogenation products. No 1,4-dicarbonyl compounds could be isolated even in the presence of excess oxidizing agent, copper(II) chloride. Condensation of 2-(methoxymethoxy)arenecarbaldehydes with ethyl bromoacetate in the presence of sodium telluride gave the expected α,β-unsaturated esters which resisted cyclization to yield the desired coumarin derivatives. Attempted intramolecular Reformatsky-type reaction of 2-(bromoacetoxy)benzaldehyde gave only 6,12-epoxy-6H,12H-dibenzo[b,f]-[1,5]dioxocin as the major product.
Generation of an N-Sodioazomethine Ylide and Its Cycloadditions with α,β-Unsaturated Esters
Authors: Kanemasa Shuji , Yoshioka Manabu , Tsuge Otohiko 
Published: July 2006

Abstract
Treatment of methyl 2-(benzylideneamino)propanoate with sodium hydride in THF generates an N-sodioazomethine ylide, which shows a very poor stereoselectivity in the cycloaddition with methyl acrylate. However, addition of such a base as triethylamine or t-butyl alcohol improves the selectivity. Chemical properties of the ylide have been discussed on the basis of the selectivity totally different from that of N-lithio analogue.
Total Syntheses of (+)-Altholactone [(+)-Goniothalenol] and Three Stereocongeners and Their Cytotoxicity against Several Tumor Cell Lines
Authors: Ueno Yoshihide , Tadano Kin-ichi , Ogawa Seiichiro , McLaughlin Jerry L , Alkofahi Ahmad 
Published: July 2006

Abstract
Enantiospecific total synthesis of (+)-altholactone [(+)-goniothalenol] (1), a novel tetrahydrofuropyran-5-one possessing significant cytotoxicity against several tumor cell lines, has been achieved by using l-arabinose as the redundant starting material. The pivotal tetrahydrofuran formation was realized by treatment of the diastereomeric mixture of (2S,3R)-4,5-epoxy-5-phenyl-1,2,3-pentanetriol 1,3-benzylidene acetals 8 and 8′ with silica gel. Simultaneous stereochemical inversion at C-4 and C-5 of the major cyclization product, O,O′-benzylidene derivative of (2S,3R,4S,5S)-2-(hydroxymethyl)-5-phenyltetrahydrofuran-3,4-diol (11), to the 2S,3R,4R,5R diastereomer 10 was achieved by hydroboration of (2S,3S)-3-hydroxy-2-(hydroxymethyl)-5-phenyl-2,3-dihydrofuran O,O′-benzylidene derivative (18) which derived from 11. Pfitzner-Moffatt oxidation of 10 followed by NaBH4 reduction gave the 2S,3R,4S,5R diastereomer 20 exclusively. Displacement of the triflate group in (2S,3R,4S,5S)-2-(hydroxymethyl)-5-phenyl-4-[(trifluoromethylsulfonyl)oxy]tetrahydrofuran-3-ol O,O′-benzylidene derivative (21) by acetate, which was prepared from 11, furnished the 2S,3R,4R,5S diastereomer 22. The total synthesis of 1 was completed by Collins oxidation of (2S,3R,4R,5R)-2-(hydroxymethyl)-3,4-bis(methoxy-methoxy)-5-phenyltetrahydrofuran (34), which was prepared from 10, and subsequent Witting olefination with (ethoxycarbonylmethylene)triphenylphosphorane followed by hydrolysis. By employing the analogous reaction sequence, compounds 11, 20, and 22 were efficiently converted into (+)-7,8-di-epi- (2), (+)-7-epi- (3), and (+)-8-epi-altholactone (4), respectively. The cytotoxicity of 1–4 against several tumor cell lines was examined.
Substituent-Group Effects on the Fluorescence of Aluminum–Schiff Base Complexes and Their Application to the Determination of Aluminum
Authors: Aoki Izuo , Matsunaga Toshiaki , Watanabe Kunihiro 
Published: July 2006

Abstract
The effects of the substituents in the Schiff-base N-salicylidene-o-aminophenol (SOAP) on the fluorescence of its aluminum complexes were investigated. N,N′-Disalicylideneethylenediamine (DSED) derivatives were used as aldehyde reagents for the condensation to prepare 25 different SOAP compounds, for these reagents can be conveniently hydrolyzed to yield salicylaldehyde derivatives. o-Aminophenol (OAP) derivatives were used as amine reagents for the SOAP compounds. A methoxyl group at the 4-position of the benzylidene group in the Schiff base and a sulfo group at the 5-position in the amine component increased the fluorescence intensity of the complex. The relationship between the fluorescence intensity and the structure of the complex was investigated by the Free-Wilson method of estimation, and good agreements were obtained between the experimental and the calculated values of the fluorescence intensities. The fluorometric determination procedure of aluminum was established by using 4,4′-dimethyl DSED and 4-sulfo OAP. Aluminum can be accurately determined in the range from 0.001 to 3 μg/25 ml under optimum conditions.
Effect of 2,2′-Bipyridine on Nickel(II)-Halide Interactions within Their Ternary Complexes in N,N-Dimethylformamide
Authors: Ishiguro Shin-ichi , Ozutsumi Kazuhiko 
Published: July 2006

Abstract
The formation of ternary (2,2′-bipyridine)bromonickel(II) complexes has been studied by calorimetry in N,N-dimethylformamide containing 0.16 mol dm−3 (C2H5)4-NClO4 as a constant ionic medium at 25 °C. The data are well explained in terms of the formation of [NiBr(bpy)]+ and [NiBr(bpy)2]+ (bpy=2,2′-bipyridine), and their formation constants, enthalpies and entropies were determined. It is elucidated that the affinities of Br− as well as Cl− ions to [Ni(bpy)]2+ and [Ni(bpy)2]2+ are enhanced almost to the same extent over Ni2+. The enhancement is ascribed mainly to an increase in entropies upon complexation in both NiII–Cl−–bpy and NiII–Br−–bpy systems.
The Regioselective Side-Chain Lithiation of 2-Methyl-3-thiophenecarboxylic Acid
Authors: Hui-Wen Su , Hirose Kazuo , Shirai Kozo , Kumamoto Takanobu 
Published: July 2006

Abstract
It was found that the dilithium salt (5), which was lithiated at the side-chain of 2-methyl-3-thiophenecarboxylic acid (4), was produced regioselectively by the reaction of 4 with lithium diisopropylamide (LDA). The reactions of 5 with alkyl halides resulted in the formation of 2-alkyl-3-thiophenecarboxylic acids (7). Further, δ-lactone derivatives (11) were obtained by the cyclization of the adducts (10) which were produced from 5 with aldehydes and ketones.
A Synthetic Route of 1,4,8-Trimethoxy-2-naphthalenecarbaldehyde via Duff Formylation of 4,8-Dimethoxy-1-naphthol
Authors: Tanoue Yasuhiro , Terada Akira , Matsumoto Yasuyuki 
Published: July 2006

Abstract
A convenient route for preparing 1,4,8-trimethoxy-2-naphthalenecarbaldehyde was accomplished by the following: The starting material, 4,8-dimethoxy-1-naphthol, was prepared from 1,5-dimethoxynaphthalene through 1-bromo-4,8-dimethoxynaphthalene. Formylation of this naphthol and subsequent methylation gave 1,4,8-trimethoxy-2-naphthalenecarbaldehyde.
1:1:1 Inclusion Compounds of β-Cyclodextrin with Fluorene and Alcohols or Nitriles in Aqueous Solution
Authors: Hamai Sanyo 
Published: July 2006

Abstract
Fluorene forms a 1:1 inclusion compound (FC) with β-cyclodextrin (CDx) in aqueous solution. From electronic absorption and emission spectra, FC has been found to further associate with alcohol (from ethanol to 1-pentanol) or nitrile (from propionitrile to hexanenitrile) to form a 1:1:1 inclusion compound. An equilibrium constant (K3) for the formation of the 1:1:1 inclusion compound from FC and alcohol, and that (K4) from fluorene and a 1:1 inclusion compound of CDx with alcohol have been determined. Upon going from ethanol to 1-pentanol, the value of K4 increases, reaches a maximum at 1-propanol, and then decreases while K3 monotonously increases with an increase in the alkyl-chain length of alcohol. For nitriles, K3 and K4 have also been evaluated. In this case, the largest K4 value is seen for propionitrile and butyronitrile, while K3 increases with increasing the alkyl-chain length of nitrile.
Equilibrium and Kinetic Studies of the Iron(III) Complex with N-Pyridoxylidene-l-tryptophan: Electronic Absorption and Circular Dichroism Spectral Characteristics, Stability, and Formation and Ligand-Substitution Reaction Mechanisms
Authors: Kuno Hideyuki , Okamoto Ken-ichi , Hidaka Jinsai , Einaga Hisahiko 
Published: July 2006

Abstract
Studies have been made of the electronic absorption and circular dichroism (CD) spectral characteristics, thermodynamic stability, and formation and ligand-substitution reaction kinetics of an iron(III) complex with N-pyridoxylidene-l-tryptophan (Hpdx-l-Htrp). The 1:2 (metal: ligand) complex forms in an acidic aqueous solution with the stability constant (β2) of logβ2=18.38±0.10 mol−2 dm6 (0.50 mol dm−3 (NaCl), 25 °C). The complex shows a characteristic CD spectrum in the charge-transfer region. The kinetics were studied by a stopped-flow CD method in a 0.50 mol dm−3 aqueous NaCl solution at 25 °C. The formation of the complex proceeds through six parallel pathways of Fe3+, FeOH2+, and FeCl2+ with H2pdx-l-Htrp+ and H2pdx-l-trp, with the coordination of the carboxylato group to iron(III) as the rate-determining step. The ligand-substitution reaction of the complex by ethylenediamine-N,N,N′,N′-tetraacetic acid depends neither on the entering ligand nor on the hydrogen-ion concentration. The dissociation of a coordinated Hpdx-l-trp− from [Fe(Hpdx-l-trp)2]+ is concluded to be the rate-determining step. The reaction mechasnisms are discussed in detail.
Ozonization of Thio- and Azauracils
Authors: Matsui Masaki , Kamiya Kazusaki , Kawamura Shigeo , Shibata Katsuyoshi , Muramatsu Hiroshige 
Published: July 2006

Abstract
The reactions of 2-thiouracils and azauracils with ozone have been examined. 2-Thiouracils were ozonized to give the corresponding 4(3H)-pyrimidinones and uracils. Ozone attacks the thiocarbonyl moiety and the desulfurization process to give 4(3H)-pyrimidinones competes with the oxidation process to give uracils. 5-Azauracil was stable for ozone, while 6-azauracil readily reacted with ozone to give parabanic acid.
A High Cis-Stereoselectivity in the Hydrogenation of 6-t-Butyltetrahydropyran-3-one and 2-t-Butyl-1,3-dioxan-5-one
Authors: Senda Yasuhisa , Terasawa Toshiyuki , Ishiyama Jun-ichi , Kamiyama Shin-ichi , Imaizumi Shin 
Published: July 2006

Abstract
Stereochemistry in the hydrogenation of 4-t-butylcyclohexanone and the corresponding oxa- and dioxacyclohexanone was examined. A high cis selectivity was observed in the latter two compounds regardless of the catalyst metals used here. These results were explained in terms of intramolecular nO–πCO interaction, which was supported by 13C NMR chemical shifts of the carbonyl carbons and CNDO/2 calculation.
Rhodium Catalyzed Hydrogenation of Quinolines and Isoquinolines under Water-Gas Shift Conditions
Authors: Murahashi Shun-Ichi , Imada Yasushi , Hirai Yoshiaki 
Published: July 2006

Abstract
Wide variety of quinolines and isoquinolines can be hydrogenated selectively in the nitrogen-containing ring by means of carbon monoxide and water in the presence of catalytic amount of rhodium carbonyl cluster. These reactions provide a useful method for the preparation of 1,2,3,4-tetrahydroquinolines and 1,2,3,4-tetrahydroisoquinolines which are key intermediates for the synthesis of isoquinoline alkaloids and other biologically active nitrogen compounds.
The Fluorescence Quenching of Zinc Porphyrins with the ω-[4-(4-Pyridyl)pyridinio]alkyl Group
Authors: Takahashi Kohshin , Terashima Tetsuo , Komura Teruhisa , Imanaga Hiroto 
Published: July 2006

Abstract
The fluorescence of parent porphyrins in ZnPC2bpy+(n), (PC2bpy+(n), 5-[n-[2-[4-(4-pyridyl)pyridinio]ethoxyl]phenyl]-10,15,20-triphenylporphyrin bromide, n=2,3, and 4), and ZnPC8bpy+(3), (PC8bpy+(3), 5-[3-[8-[4-(4-pyridyl) pyridinio]octyloxy]phenyl]-10,15,20-triphenylporphyrin bromide), was effectively quenched in non-coordinating solvents, such as o-dichlorobenzene and dichloromethane, because the pyridyl group in bpy+ (ω-[4-(4-pyridyl)pyridinio]alkyl group) was coordinated to zinc in porphyrin. On the other hand, the fluorescence of parent porphyrins in ZnPC2bpy+(3), ZnPC2bpy+(4), and ZnPC8bpy+ (3) was partly quenched in such coordinating solvents as N,N-dimethylformamide and pyridine. However, only the fluorescence of the parent porphyrin in ZnPC2bpy+(2) was effectively quenched, even in coordinating solvents. The hydrophobic interaction between the porphyrin ring and bpy+ in ZnPC2bpy+(2) may be considerably large, for bpy+ in ZnPC2bpy+(2) is covalently linked to the ortho position of the phenyl group in ZnTPP, (TPP 5,10,15,20-tetraphenylporphyrin), by a short chain. The emission was effectively quenched by the photoinduced electron transfer from the porphyrin ring to bpy+, because the axial coordination or the hydrophobic interaction gave bpy+ access to the porphyrin ring.
Preparation of Optically Active 1-Aminoalkylphosphonic Acids from Chiral Carbamates and Chiral Ureas
Authors: Oshikawa Tatsuo , Yamashita Mitsuji 
Published: July 2006

Abstract
Optically active 1-aminoalkylphosphonic acids were successfully synthesized from chiral carbamate and urea derivatives which were prepared from such chiral substrates as (−)-menthol, (+)-camphor, and (R)-(+)-and (S)-(−)-(1-phenylethyl)ureas by the actions of aldehydes and triaryl phosphites. 1-Aminoalkylphosphonic acid derivatives, thus prepared, have an (R)-(+)- or (S)-(−)-configuration, depending on the chiral source via a retention of the configuration; i.e., (+)-products were prepared from chiral (+)-carbamate and (+)-urea derivatives, and (−)-products from chiral (−)-carbamate and (−)-urea derivatives.