bluuebunny/crossref_metadata_2025_split huggingface dataset:
Studies on the Syntheses of Sesquiterpene Lactones. III. Improved Synthesis of Vulgarin
Authors: Ando Masayoshi , Tajima Kiyoshi , Takase Kahei 
Published: July 2006

Abstract
An improved synthesis of vulgarin is described. Epoxidation of 1-oxo-5αH,6β,11βH-eudesm-3-en-6,13-olide and successive treatment of the resulting epoxide with silica gel gave vulgarin. Oxidation of 1-oxo-5αH,6β,11βH-eudesm-3-en-6,13-olide with air or oxygen gas gave 4α-hydroperoxy-1-oxo-5αH,6β,11βH-eudesm-2-en-6,13-olide and 4β-hydroperoxy-1-oxo-5αH,6β,11βH-eudesm-2-en-6,13-olide, which were transformed into vulgarin and C4-epivulgarin, respectively.
The Base-catalyzed Tautomerization of Acetylacetone in Organic Solvents. The Correlation of the Catalytic Coefficient with the Partition Coefficient
Authors: Watarai Hitoshi , Suzuki Nobuo 
Published: July 2006

Abstract
The keto-enol tautomerization rate of acetylacetone catalyzed by triethylamine or tributylamine was observed in eight organic solvents, and the catalytic coefficient for each process of the ketonization and enolization was obtained. A remarkable solvent effect on the catalysis was discussed following the linear free-energy relationship between the catalytic coefficient and the liquid-liquid partition coefficients of the keto and enol forms. It was concluded that, in the homogeneous base-catalysis, the solvent affects the free-energy change of the transition state more greatly than those of the keto and enol forms. On the contrary, in the heterogeneous catalysis by the silica surface, the free-energy change of the keto and enol forms was suggested to be the main factor governing the kinetic solvent effect.
NMR Studies on Zerovalent Metal π-Complexes of Dibenzylideneacetone. II. Structure and Pt–H Coupling in the Binuclear Platinum Complex
Authors: Tanaka Hisao , Kawazura Hiroshi 
Published: July 2006

Abstract
The NMR analysis on the olefinic protons of the binuclear complex Pt2[(C6H5CH=CH)2CO]3 was conducted on the deuteriated compounds Pt2[(C6D5CH=CH)2CO]3, Pt2[(C6D5CD=CH)2CO]3, and Pt2[(C6D5CH=CD)2CO]3. Examination of the various 1H NMR parameters revealed the individual characteristics of the six coordinated olefins of three dibenzylideneacetone ligands with respect to the metal-olefin bonding and coordination geometry. The three ligands which triply bridge the two Pt atoms are composed of one s-cis,cis ligand which is distant from the Pt atoms and of two s-cis,trans ligands which are close to the Pt atoms. Asymmetry in the coordination, which is caused by the gliding of the olefinic double bond to the metal atom, becomes greater as the olefinic moiety approaches the metal atom more closely. The major transmission route of the Pt–olefinic proton coupling is attributable to metal to olefin π-back bonding.
Trimethylenediamine Complexes. VII. Optically Active Mixed-Ligand Cobalt(III) and Chromium(III) Complexes Containing Trimethylenediamine and the Acetylacetonate Anion
Authors: Nakano Mamoru , Kawaguchi Shinichi , Kawaguchi Hiroshi 
Published: July 2006

Abstract
The [M(acac)(tn)2]2+ and [M(acac)2(tn)]+ complexes (M=Co and Cr) have been prepared and resolved by (R,R)-tartratoarsenate(III) and hydrogen-(R,R)-di-O-benzoyltartrate, respectively. On the basis of the CD-spectral studies in comparison with the corresponding ethylenediamine complexes, the absolute configurations of (+)589-[Co(acac)(tn)2]2+, (−)589-[Co(acac)2(tn)]+,(+)589-[Cr(acac)(tn)2]2+, and (−)589-[Cr(acac)2(tn)]+ were all assigned to Λ. Electronic spectra of these complexes and proton NMR spectra of the cobalt(III) complexes are also reported.
11B-NMR Study of the Complex Formation of Borate with Catechol and l-Dopa
Authors: Yoshino Kazuo , Kotaka Masahiro , Okamoto Makoto , Kakihana Hidetake 
Published: July 2006

Abstract
In the solution of catechol and borax at pH 11, the equilibria between catechol and the monomeric borate anion to form the 1 : 1 and 2 : 1 (catechol: boron) anionic complexes have been demonstrated by the existence of 11B-NMR signals for the two complexes and the monomeric borate anion. In the solution of l-dopa and borax at pH 11, however, the signal for the 2 : 1 anionic complex was not observed, though it was observed below pH 7. By the 11B-NMR spectra at pH 6.5, the complex formation constants, logK1 and logK2, have been estimated as 3.9 and 4.4 for catechol, and as 4.3 and 5.0 for l-dopa, respectively.
p-Styrenesulfinic Acid and Its Polymer as Reactants
Authors: Kamogawa Hiroyoshi , Inoue Hideaki , Fukuyama Hiromoto , Nanasawa Masato 
Published: July 2006

Abstract
The free-radical aqueous polymerizations of p-styrenesulfinates (Na, K, NH4, NHEt3-salts) provided watersoluble polymers with high molecular weights at low conversions. The polymers contained 62–84% of the sulfinate unit and indicated half-oxidation potentials ranging from 340 to 415 mV. The nucleophilic reactions of the sodium polysulfinate [poly(sulfinic acid)] prepared from cross-linked polystyrene are highly dependent upon the swelling nature of the solvent. The reactions consisting of (A) simple displacements with activated halomethyl groups, (B) reductive additions to quinonoid compounds such as TCNQ and alizarin, and (C) displacements of the activated aromatic nitro groups, e.g., of 2,4,7-trinitrofluorenone have been investigated and the results compared with those of p-toluene and p-styrenesulfinates. The effect of the solvent on the reaction rate is in the order: DMSO&gt;DMF&gt;HMPA.
The Low-Energy π,π* S-S Absorption Spectra of 1,4-Dimethyl-and 1,4-Dichloroanthraquinones
Authors: Kuboyama Akira 
Published: July 2006

Abstract
The very broad absorption band of 1,4-dichloroanthraquinone, which corresponds to the allowed 1B2uπ,π* band of anthraquinone (AQ), is shown to consist of two π,π* bands with comparable intensities. The band which corresponds to the 1Ag forbidden band of AQ is at longer wavelengths than the band corresponding to the 1B2u band of AQ. MO calculations were made, and MCD spectra and 77 K absorption spectra were measured. The very broad absorption band of 1,4-dimethyl-AQ can probably be similarly interpreted. The strong visible π,π* bands of 1,4- and 1,5-disubstituted AQ’s are shown to arise from the 1Ag and 1B2u bands of AQ, respectively.
A Study of the Spin-Lattice Relaxation Time, T1, of Coal-derived Oil
Authors: Yoshida Tadashi , Maekawa Yosuke , Uchino Hiroyuki , Yokoyama Susumu 
Published: July 2006

Abstract
The spin-lattice relaxation time, T1, of carbons was measured for various types of carbons in ring-type fractions separated from coal-derived oil. The T1 for most carbons in the coal-derived oil was less than 2 s because of the existence of free radicals, while the T1’s of aromatic non-protonated carbons in the monocyclic and bicyclic aromatics fractions were approximately 12–15 s. The effects of a relaxation reagent on the T1 were also discussed.
Synthesis of Some 3-Methylbut-2-enylated 1,3,5-Trihydroxyxanthones
Authors: Gujral Vinod , Gupta S R 
Published: July 2006

Abstract
1,3,5-Trihydroxyxanthen-9-one reacts with 2-methylbut-3-en-2-ol in presence of a catalytic amount of BF3-etherate to yield a mixture of 1,3,5-trihydroxy-2,4-bis-(3-methylbut-2-enyl)xanthen-9-one, in poor yield, identical with natural 8-desoxygartanin along with 1,3,5-trihydroxy-4-(3-methylbut-2-enyl)xanthen-9-one (3), in good yield, and 1,3,5-trihydroxy-2-(3-methylbut-2-enyl)xanthen-9-one (4) in poor yield. Compounds 3 and 4, the probable biogenetic precursors of 6-desoxyisojacareubin and 6-desoxyjacareubin, have been reported to occur in nature as such but were characterised as their dimethyl ethers. Compounds 3 and 4 on oxidative cyclisation with DDQ, gave 6-desoxyisojacareubin and 6-desoxyjacareubin respectively, completely identical with authentic natural samples.
Structural Studies of Commensurate Peierls State of Rb1.67[Pt(C2O4)2]·1.5H2O
Authors: Kobayashi Akiko , Sasaki Yukiyoshi , Kobayashi Hayao 
Published: July 2006

Abstract
X-Ray examination, chemical analyses and electrical conductivity measurements have been conducted on the partially oxidized platinum complex Rb1.67[Pt(C2O4)2]·1.5H2O (RbDOX). The cell constants are a=12.690(10), b=17.108(14), c=11.357(3) Å; α=102.04(4), β=115.17(3), γ=43.58(4)°, and the space group is P\bar1. The planar bis(oxalato)platinate ions stack along the crystallographic b axis and the Pt atoms form a sixfold distorted chain. RbDOX is the first example of a sixfold structure. Three independent Pt–Pt distances are 2.717(3), 2.830(3), and 3.015(3) Å. The Pt–Pt distance of 2.717 Å is the shortest spacing so far observed in partially oxidized platinate salts and shorter than the 2.77 Å interatomic separation in Pt metal itself. The oxalate ligands are staggered (46°, 55°, 80°) with respect to the ligands directly above and below them along the chain. Sixfold modulated superstructure of RbDOX is confirmed as the newly found commensurate Peierls structure based on agreement with the period of the Peierls distorted superlattice determined by the degree of partial oxidation. The calculation of Coulomb energy shows that RbDOX has a crystal lattice in which the interchain Coulomb energies are at a minimum indicating the strong tendency of the anti-phase ordering of the nearest-neighbour Pt chains.
High Resolution Infrared Spectrum of Chlorine Dioxide: The v2 Fundamental Band
Authors: Hamada Yoshiaki , Tsuboi Masamichi 
Published: July 2006

Abstract
Fourier transformed infrared absorption spectrum of gaseous ClO2 has been obtained with the resolution of 0.06 cm−1. The rotational structure of the bending fundamental band (v2=1←0) was analyzed. Rotational constants determined were in good agreement with previous microwave results. The band center was now fixed at 447.675±0.030 cm−1, and five centrifugal distortion constants for the v2=1 state were also newly determined.
Kinetics of the Oxidative Addition Reaction of Iodine to (Dimethyldithiocarbamato)bis(2,4,6-rimethylphenyl isocyanide)rhodium(I)
Authors: Kuwae Ryosho , Tanaka Toshio , Kawakami Katsuhiko 
Published: July 2006

Abstract
The reaction of Rh(dtc)L2 (dtc=S2CN(CH3)2, L=2,4,6-(CH3)3C6H2NC) with an equimolar amount of iodine yields a trans adduct, RhI2(dtc)L2. The rate of this reaction was measured in benzene, employing a stopped flow technique under pseudo-first-order conditions with excess iodine. The result indicates that the reaction proceeds via a charge transfer complex Rh(dtc)L2·I2, which is rearranged in two consecutive zero-order reactions with respect to the I2 concentration; the rearrangement of Rh(dtc)L2·I2 to a cis adduct followed by isomerization to the trans adduct. This mechanism is supported from kinetic data for the reaction of Rh(acac)L2 (acac=CH3COCHCOCH3) with I2. It is also described that RhI(I3)(dtc)L2 and RhI(I3)(acac)L2 were obtained by reactions of Rh(dtc)L2 and Rh(acac)L2 with excess iodine, respectively.
Synthesis and Structure of a Hexa-coordinated Vanadium(IV) Complex Aquaoxo[N-(2-pyridylmethyl)iminodiacetato]vanadium(IV) Dihydrate
Authors: Ooi Shun’ichiro , Nishizawa Masato , Matsumoto Keiji , Kuroya Hisao , Saito Kazuo 
Published: July 2006

Abstract
A new complex, aquaoxo[N-(2-pyridylmethyl)iminodiacetato]vanadium(IV) dihydrate [VO(pmida)(H2O)]·2H2O has been synthesized and its crystal structure determined by the X-ray method. The triclinic crystals obtained from water or aqueous ethanol solution are twinned and contain 2 mol of lattice water. The unit cell contains four formula units and the structure was analyzed on the assumption that the space group is P\bar1. The positional and thermal parameters were refined to R=0.115. The vanadium atom has a distorted octahedral coordination and deviates by 0.39 Å from the equatorial plane, which is composed of two cis carboxylate oxygens, a water molecule and the pyridine nitrogen. Vanadyl oxygen and tertiary nitrogen occupy the axial sites. Absorption spectra indicated that the structure is maintained in an aqueous solution of pH 3.0 to 4.9. This geometrical isomer seems to be formed selectively in an aqueous medium.
The Partial Reduction of Carboxylic Acids to Aldehydes via 3-Acylthiazolidine-2-thiones with Diisobutylaluminum Hydride and with Lithium Tri-t-butoxyaluminum Hydride
Authors: Izawa Toshio , Mukaiyama Teruaki 
Published: July 2006

Abstract
3-Acylthiazolidine-2-thiones, easily prepared from carboxylic acids and readily available thiazolidine-2-thione, were reduced to the corresponding aldehydes either with diisobutylaluminum hydride in toluene at −78–−40 °C in 70–90% yields or with lithium tri-t-butoxyaluminum hydride in tetrahydrofuran at −20-0 °C in 80–90% yields. The present method appears to be applicable to the synthesis of aldehydes from both aromatic and aliphatic derivatives having chloro, bromo, nitro, and noncojugated double bond, except for the reduction of α,β-unsaturated derivatives with lithium tri-t-butoxyaluminum hydride and of cyano derivative with diisobutylaluminum hydride. Completion of the reduction is indicated by disappearance of the original yellow color of the reaction mixture.
Studies on N1-Hydroxy-N1,N2-diarylbenzamidines as Metal Complexing Agents: Extraction-Photometric Determination of Iron(III) as Thiocyanato and Azido Mixed Ligand Complexes with N1-Hydroxy-N1,N2-diphenyl-p-toluamidinel(HDPTA)
Authors: Patel K S , Deb Kanak Kanti , Mishra Rajendra K 
Published: July 2006

Abstract
N 1-Hydroxy-N1,N2-diarylbenzamidines react with iron(III) in presence of thiocyanate and azide forming coloured complexes which are quantitatively extractable in benzene. The extraction of iron(III) as red Fe(III)–L–(SCN−)2 complex is quantitative at 0.1–0.6 M hydrochloric acid concentration, whereas the Fe(III)–L–(N3−)2 complex gets quantitatively extracted into benzene at pH 1.0–2.5. The ternary iron(III)-thiocyanato complex of N1-hydroxy-N1,N2-diphenyl-p-toluamidine(HDPTA) has a fairly large molar absorptivity (1.01×104 1 mol−1 cm−1) and the spectrophotometric method based on this colour reaction is highly selective as almost all common ions including Fe(II) do not interfere. The method employing the formation of ternary iron(III): HDPTA: azide complex is also highly selective.
Oxidation of Ammonia with Lattice Oxygen of Metal Oxides by Pulse Reaction Technique
Authors: Kosaki Yukio , Miyamoto Akira , Murakami Yuichi 
Published: July 2006

Abstract
On V2O5, MoO3, and WO3, lattice oxygen has been found to be the active oxygen species for the catalytic oxidation of NH3, whereas on MnO2, Co3O4, Fe2O3, and NiO, adsorbed oxygen also played a significant role in the reaction. NO has been found to be an intermediate in the reaction of NH3 with lattice oxygen.
Substituent Effects in Heterogeneous Catalysis. V. Steric Hindrance of Bulky AlkyI Substituents in Cyclohexanone Hydrogenation
Authors: Chihara Teiji , Tanaka Kazunori 
Published: July 2006

Abstract
The reactivities of 2-isopropyl- and 2-t-butylcyclohexanone were measured relative to cyclohexanone in both individual and competitive hydrogenation over Ru/Al2O3, Rh/Al2O3, and Pt/Al2O3. The results obtained suggest that alkyl substitution sterically hinders much more significantly the ketone adsorption than the following surface reaction. A molecular model is presented for adsorption of each ketone.
Population Analysis of (R)-Thiazolidine-4-carboxylic Acid
Authors: Kamo Jun , Tanaka Nobuo , Matsuura Yoshiki , Ashida Tamaichi , Kakudo Masao 
Published: July 2006

Abstract
The structure of (R)-thiazolidine-4-carboxylic acid was refined at 111 and 293 K, respectively. Population analysis, which refines the population of the electrons in the molecule, was carried out, the result being compared with that of theoretical calculation.
Phase Transition of SnCl2(H2O)x(D2O)2−x as Studied by High Resolution Heat Capacity Measurement
Authors: Tatsumi Masami , Matsuo Takasuke , Suga Hiroshi , Seki Syûzô 
Published: July 2006

Abstract
The previously published heat capacity data on Sncl2(H2O)x(D2O)2−x (x=2.00, 1.97, 1.75, 1.50, 0.96, 0.50, 0.25, 0.03) were analyzed to derive anomalous contribution due to the phase transitions that occur between 218 and 235 K depending on the isotopic composition. The phase transition is of the first-order for x=2.00, 1.97, and 1.75. The entropy discontinuities at the transitions are (0.149±0.005), (0.152±0.005), and (0.133±0.010) J K−1 mol−1, respectively, out of the total transition entropies of 3.98, 3.90, and 3.89 J K−1 mol−1. The first-order transition does not occur for the other crystals for which the heat capacity anomaly is rounded. Apparent critical exponent α of the heat capacity was calculated for all of the crystals. They are in the range from 0.43 to 0.80 and have the same value below and above the transition temperature for each of the crystals in agreement with the spatial two dimensionality of the crystal structure. No evidence was found for crossing-over to the three dimensional ordering. Change of the transitional behavior with the isotopic composition was discussed in analogy with the liquid-vapor critical phenomenon. An argument based on the crystallographic symmetry of the actual crystal and the corresponding dimer lattice was advanced for this interpretation of the unusual isotope effect.
Stereospecific Synthesis of d-Isothreonine from l-Threonine
Authors: Shimohigashi Yasuyuki , Waki Michinori , Izumiya Nobuo 
Published: July 2006

Abstract
d-Isothreonine, (2R,3S)-3-amino-2-hydroxybutanoic acid (4), was readily prepared by the ammonolysis of optically active 2-bromo-3-hydroxybutanoic acid derived from l-threonine. The configuration of 4 was deduced from the shift of molecular rotation, Cotton effect in ORD curve of 4, and NMR measurement of its oxazolidone derivative.
Modification of Aminocyclitol Antibiotics. 7. Preparation of 5-Epikanamycin B
Authors: Suami Tetsuo , Nakamura Katsumi 
Published: July 2006

Abstract
A configuration of the OH group on C-5 of 2-deoxystreptamine moiety of kanamycin B has been epimerized. 5-Epikanamycin B thus obtained was tested against several microorganisms. The structure of the antibiotic was elucidated by 1H and 13C NMR spectrometry.
Polarity of Free Radicals in Hydrogen Abstraction Reactions
Authors: Shinohara Hiroyuki , Imamura Akira , Masuda Takahiro , Kondo Masaharu 
Published: July 2006

Abstract
The electrophilicity of the CF3 radical in hydrogen abstraction reactions was studied theoretically by the CNDO/2 method. The activation energy for hydrogen abstraction by the CF3 radical from aliphatic hydrocarbons decreases with an increase in the electron density on the hydrogen atom to be abstracted. The origin of the electrophilicity of the CF3 radical can be well understood by the stabilization energy due to delocalization of electrons (SEDE) between the radical and substrate. The electrophilic stabilization energy denned by the SEDE from substrate to the radical governs the relative reactivities of aliphatic hydrocarbons, CH4&lt;CH3CH3&lt;CH3CH2CH3&lt;(CH3)3CH, which corresponds to the order of the increase in the electron density. The results indicate that the radical is an electrophile if the relative reactivities of substrates are governed by the electrophilic stabilization energy, and a nucleophile when the reactivities are governed by the nucleophilic stabilization energy (the SEDE from the radical to substrate). SEDE was calculated for the reactions of the OH and the CH3 radicals with CH4and CH3CN; the results indicated that the OH radical is electrophilic and the CH3 radical nucleophilic. These polarities of radical reagents are discussed in connection with their physicochemical properties such as ionization potentials and electron affinities.
The Solvent Extraction Study of a Dibenzo-18-crown-6 Complex with Silver Picrate
Authors: Takeda Yasuyuki , Takahashi Fujio 
Published: July 2006

Abstract
The extraction constant of the silver ion–dibenzo-18-crown-6 (DB18C6) complex between benzene and water and the complex-formation constant of DB18C6 with silver picrate in benzene were determined at 25 °C. The Ag+–DB18C6 complex is much more extractable than the Ag+–18-crown-6 one. The Ag+–DB18C6 complex is much more stable for benzene than for aqueous solutions.
Adsorptive Mechanism on Activated Carbon in the Liquid Phase. III. The Relationship between the Physical Constants of Organic Compounds and Their Adsorbabilities on Activated Carbon from an Aqueous Solution
Authors: Abe Ikuo , Hayashi Katsumi , Kitagawa Mutsuo , Urahata Toshihiro 
Published: July 2006

Abstract
In order to evaluate the adsorbability for a given activated carbon from a knowledge of the physical properties of the adsorbate, the partition coefficients (α) of 93 organic compounds between the solution and the adsorbed phases at an infinite dilution have been calculated and correlated with the various physical constants. For aliphatic monofunctional compounds, a good linear relationship is obtained between logα and the following physical constants: molecular weight, molar attraction constant, and modified organicity/inorganicity value. This indicates that these physical constants are useful for predicting the adsorbability of aliphatic monofunctional compounds and that a straight line represents the adsorption characteristics of a given activated carbon. The correlation coefficient between the logα value and the physical constants for multifunctional compounds is lower than that for monofunctional compounds. The adsorptive mechanism on activated carbon in an aqueous solution is discussed on the basis of the conclusion obtained in the previous paper.
Synthesis and Electrical Properties of TCNQ Radical Anion Salts with N,N′ Ethylenedi(1,3-dithiolan-2-iminium) Dication and Related Dications
Authors: Yumoto Yoshiji , Nishioka Ryoji , Tanaka Toshio 
Published: July 2006

Abstract
Simple and complex salts of the TCNQ\ewdot radical anion with N,N′-ethylenedi(1,3-dithiolan-2-iminium) dication and related dications, (Remark: Graphics omitted.) (R=H, Me; n=2, 6; m=2, 3, or 4) and (Remark: Graphics omitted.) (m=2, 3) were synthesized. All the salts as compacted samples display semiconducting behaviors in the 77–300 K range. Electrical resistivities of the simple salts are in the range of 1.8×105–9.8×107Ω cm at 25 °C. Electronic absorption spectra and magnetic susceptibilities suggest that the simple salts in the solid state involve (TCNQ)22− dimer. The 1 : 3 complex salt of N,N′-dimethyl-N,N′-ethylenedi(1,3-dithiolan-2-iminium) with TCNQ, (Remark: Graphics omitted.), exhibits a lower electrical resistivity (3.4 Ω cm) than other four complex salts (2.4×10–2.5×103Ω cm). Electronic absorption spectra and magnetic susceptibilities of the both 1: 3 and 1:4 complex salts are interpreted in terms of the interaction between the TCNQ moieties.
The Crystal and Molecular Structure of Epoxyisoacoragermacrone
Authors: Ueda Hideo , Katayama Chuji , Tanaka Jiro 
Published: July 2006

Abstract
The crystal and molecular structure of epoxyisoacoragermacrone, which is an important derivative of acoragermacrone isolated from Acorus calamus L. for the study of the structural organic chemistry and biogenetic reactions, has been determined by the X-ray method. The crystal is orthorhombic, P212121, with lattice parameters a=7.425(2), b=26.604(8), and c=7.150(2) Å. The ten-membered ring is in a boat-chair conformation similar to the highly strained cis, trans-germacradiene system. The methyl groups take the axial and syn arrangement, and are on the β-face of the medium ring.
Preparation of Copper(I)–Phosphine Complexes Having Cu–N Bonds and Their Reactions with Organic Halides
Authors: Yamamoto Takakazu , Ehara Yoshio , Kubota Minoru , Yamamoto Akio 
Published: July 2006

Abstract
Reactions of a methylcopper complex CH3Cu(PPh3)2(diethyl ether)0.5 (PPh3=triphenylphosphine) with active N–H compounds HNR1R2 give the corresponding copper derivatives formulated as R1R2NCu(PPh3)n (n=2 for R1R2N=phthalimido, succinimido, N-phenylacetamido (4), acrylamido, phenylamido, and 2-oxo-1-pyrrolidinyl; n=1 for R1R2N=acetamido). The IR and NMR spectroscopic data of the complexes support the bonding of the R1R2N group to Cu through nitrogen. The reactions of the Cu(I)–N complexes with alkyl and aryl halides (RX) afford the corresponding N-substituted compounds RNR1R2 in high yields.