bluuebunny/crossref_metadata_2025_split huggingface dataset:
Kinetics and Mechanisms of Photoinduced Electron-Transfer Reaction of Magnesium Myoglobin
Authors: Tsukahara Keiichi , Nishikawa Yuki , Kimura Chieko , Sawai Naoko , Sakurai Takeshi 
Published: July 2006

Abstract
Horse heart metmyoglobin was reconstituted with magnesium(II) porphyrin, [Mg(dp)] (3,7,12,17-tetramethyl-2,18-bis(2-carboxyethyl)porphyrinatomagnesium(II)). Photoinduced electron-transfer (ET) between magnesium myoglobin (MgDPMb) and cationic and anionic quenchers, such as viologens and anthraquinone-2-sulfonate (AQS−), has been studied in an aqueous degassed solution. None of the quenchers examined in this work formed a detectable associated complex with MgDPMb. The thermal backward ET reaction was observed for these quenchers. Not only photoinduced ET but also thermal backward ET reactions were insensitive to the driving force of the reactions. Moreover, there was little effect of metal-ion substitution; the rate of reaction was similar to that for zinc myoglobin. Thus, the reactions are controlled by conformational changes in the myoglobins.
Chemical Amplification Method by Spectrophotometry for the Determination of Trace Amounts of Selenium
Authors: Ramesh A , Ramakrishna T V , Subramanian M S 
Published: July 2006

Abstract
A rapid and sensitive spectrophotometric method has been developed based on the extraction of the ion-association complex formed between ICl2− and Rhodamine 6G+ into benzene. The ICI2− is formed through iodine which is liberated during the oxidation of iodide by the selenium(IV) present in sulfuric acid medium. The method is sensitive and down to 0.1 μg selenium could be determined in an aqueous phase volume of 10 ml. The extracted Rhodamine 6G+–ICl2− complex has a molar absorptivity of 4.8 × 105 dm3 mol−1 cm−1 at 535 nm. Beer’s law is obeyed over the range 0.1 to 0.9 μg of selenium. The relative standard deviation is 2.4%. The method is made more sensitive and selective by adopting the aluminium hydroxide collection procedure. The interference of few ions such as Fe3+, VO3−, TeO32− and Sb5+ which were collected along with selenium on aluminium hydroxide, were overcome by adding proper masking agents. The method was applied to the determination of selenium in environmental ash sample, copper ore, bark sample, and shampoo preparations.
Synthesis, Structure, and Magnetic Property of Linear Chloro-Bridged Nickel(II) Tetramer with Dinucleating Bis-dimethylcyclam Ligand
Authors: Kajiwara Takashi , Yamaguchi Tadashi , Oshio Hiroki , Ito Tasuku 
Published: July 2006

Abstract
A new nickel(II) complex with the composition of Ni2Cl2(L)(ClO4)2·1.5H2O (L = α,α′-bis(5R(S),7S(R)5,7-dimethyl-1,4,8,11-tetraazacyclotetradecan-6-yl)-o-xylene) has been prepared via a four coordinate complex [Ni2(L)] (ClO4)4·3H2O from [Ni2(μ-Br)Br2(L)]Br·H2O. The compound crystallizes in orthorhombic space group Ccm21 with cell parameters at −80 °C, a = 21.90(1), b = 20.28(1), c = 19.63(1) Å, V = 8718(1) Å3, Z = 8. The crystal consists of the cationic dinuclear unit [Ni2(μ-Cl)Cl2(L)]+, the counter anion ClO4−, and water of crystallization. In [Ni2(μ-Cl)Cl2(L)]+, three chloride ions and two nickel ions are alternately arranged in an almost linear manner, and two cyclam rings with the most stable trans-III type conformation are arranged in a face-to-face manner. This cationic dinuclear unit is further connected to each other by sharing the terminal Cl ligand to form pseudo one-dimensional chain structure of the ···Cl–Ni–Cl–Ni–Cl··· type. However, one of the Cl atoms which bridges the dinuclear units is statistically disordered at two positions along the chain and thereby the repeating unit in the chain is a chloro bridged dimer of the dinucleating ligand complex. The neighboring Ni–Cl distances range from 2.568(4) to 2.855(4) Å. The temperature dependent magnetic behavior in the range of 25—300 K has been interpreted by the usual Heisenberg–Dirac–Van Vleck model, assuming that only three Ni(II) ions in {Ni2Cl2(L)}2 are paramagnetic. The best fit parameters were J = −48.2(3) and J′ = −11.2(3) cm−1 for = −2J(S1·S1′) − 2J′(S1·S2).
Dithiooxalato(dto)-Bridged Bimetallic Assemblies {NPr4[MCr(dto)3]}x (M = Fe, Co, Ni, Zn; NPr4 = Tetrapropylammonium Ion): New Complex-Based Ferromagnets
Authors: Okawa Hisashi , Mitsumi Minoru , Ohba Masaaki , Kodera Masahito , Matsumoto Naohide 
Published: July 2006

Abstract
The reaction of potassium calcium tris(dithiooxalato)chromate(III) hexahydrate KCa[Cr(dto)3]·6H2O, a metal(II) salt and a tetrapropylammonium bromide (NPr4Br) in aqueous methanol forms bimetallic assemblies {NPr4[MCr(dto)3]}x (M = Fe (1), Co (2), Ni (3), Zn (4)), where the dto group bridges Cr(III) and M(II) ions through the sulfur atoms to Cr(III) and through the oxygen atoms to M(II) to provide an alternate array of Cr(III) and M(II) ions. The magnetic susceptibility data for 1—3 in the temperature range 5—300 K obey the Curie Weiss law (χM−1 = (T − θ)/C) with a positive Weiss constant (+18 K for 1, +24 K for 2, and +41 K for 3), and the effective magnetic moments increase with decreasing temperature. The megnetization studies (field-cooled magnetization, remnant magnetization, and zero-field cooled magnetization) reveal the ferromagnetic phase transition at TC = 8, 16, and 23 K for 1, 2, and 3, respectively. The assembly 4 shows paramagnetic behavior in the temperature range of 5—300 K.
Nucleophilic Reaction upon Electron-Deficient Pyridone Derivatives. XIII. Regioselective Synthesis of 2-Substituted 3-Nitropyridines by One-Pot Reaction of Either 4- or 6-Substituted 1-Methyl-3,5-dinitro-2-pyridones with Ketones and Ammonia
Authors: Tohda Yasuo , Kawahara Tohru , Eiraku Miyuki , Tani Keita , Nisiwaki Nagatoshi , Ariga Masahiro 
Published: July 2006

Abstract
A one-pot synthesis of 2-substituted 3-nitropyridines was developed by a ring transformation of 6- or 4-substituted 1-methyl-3,5-dinitro-2-pyridones (2 or 3) with ammonia and enamines derived from ketones. Some intermediates having a 2,6-diazabicyclo[3.3.1]nonane skeleton were isolated from reactions of 3. The ring transformation proceeds via an addition-addition-elimination-elimination mechanism. Few competitive isomeric by-products, 4-substituted 3-nitropyridines and 4-nitroanilines, were formed. All the 2 substrates showed good reactivity, but the 3 substrates having electron-withdrawing substituents were less reactive and selective. 1,4,6-Trimethyl-3,5-dinitro-2-pyridone did not gave any products. The selectivity is interpreted in terms of differences of thermodynamic (main selection rule B) and kinetic stability (minor selection rule A) between the possible bicyclic intermediates which are expected to be formed via the mechanism.
Synthesis of Unsymmetrical 2,3-Diaryl- and 2,4-Diarylthiophenes Starting from 2,5-Dichlorothiophene
Authors: Sone Tyo , Sato Kazuaki , Umetsu Yasuhiro , Yoshino Akihiro , Takahashi Kensuke 
Published: July 2006

Abstract
Unsymmetrically substituted 2,4-diaryl- and 2,3-diarylthiophenes were synthesized from 2,5-dichlorothiophene via 4-aryl-2-chlorothiophenes in two and four steps including Ni-mediated cross-coupling, respectively. Aluminum chloride-catalyzed reaction of 3-aryl-2-chlorothiophenes with some aromatic ethers unexpectedly led to the formation of the corresponding 2,4-isomers.
Oxidation of Nucleic Acid Related Compounds by the Peroxodisulfate Ion
Authors: Itahara Toshio , Yoshitake Takashi , Koga Sunao , Nishino Akihiro 
Published: July 2006

Abstract
The treatment of nucleic acid bases, nucleosides, and nucleotides with peroxodisulfate ion in a phosphate buffer solution at pH 7.0 or water at 70—75 °C was investigated. The reaction of thymine and 5-methylcytosine nucleosides and nucleotides resulted in the oxidation of the 5-methyl groups. The oxidation products from 1,3-dimethyluracils and the time-course of the reaction of uracils led to two plausible reaction mechanisms for the oxidation of uracils.
Perfluoroalkyl-Chalcogenation of Alkynes
Authors: Ueda Yasufumi , Kanai Masatomi , Uneyama Kenji 
Published: July 2006

Abstract
Perfluoroalkyl-telluration of alkynes has been performed by a (PhTe)2–NaBH4–RfX system at a low temperature (−40, −80, or −100 °C) to give 2-(perfluoroalkyl)vinyl tellurides. Meanwhile, perfluoroalkyl-sulfenylation and perfluoroalkyl-selenation were less effective. The perfluoroalkyl-telluration proceeds mainly via both SRN1 process and photochemical addition of the in situ formed perfluoroalkyl phenyl telluride (RfTePh). The efficiency of the chalcogenolate anions for perfluoroalkyl-chalcogenation was found to be the order of PhS− &lt; PhSe− &lt; PhTe−.
Conductance Measurements in Corrosion and Inhibition of Al and Al–Mn Alloy
Authors: El-Cheikh Fathla M , Assaf Fawzi H , Khodari Mahmoud , Ghandour Mahmoud A , Krisha Mortaga M Abou 
Published: July 2006

Abstract
Studies were performed to determine the effect of 2-picoline, 3-picoline, 4-pyridinol, and 2-pyridinamine on the dissolution of untreated, anodized, and sealed aluminum and aluminum–manganese alloys at 30.0 and 40.0 °C. Conductance measurements were applied to evaluate the corrosion rate. A comparison was carried out between this newly suggested conductance method and other methods previously used to estimate the dissolution rate. This comparison shows of the reliability of this conductance method. A good correlation was observed between the basicity, structure, and the inhibition effect of all compounds investigated. The order of inhibition efficiency is increasing as: 2–pyridinamine &gt; 4–pyridinol &gt; 3–picoline &gt; 2–picoline. This order described above is consistent with the evidence that the oxidized specimens show higher inhibition in the presence of additives than sealed and untreated ones.
Purification of CO Based on Selenium-Amine-CO Chemistry
Authors: Tsunoi Shinji , Miyoshi Noritaka , Ogawa Akiya , Kambe Nobuaki , Sonoda Noboru 
Published: July 2006

Abstract
Efficient separation of carbon monoxide from a binary mixture of carbon monoxide and hydrogen with selenium and secondary amines has been developed. The process consists of (i) selective reaction of CO with selenium and a secondary amine to form the corresponding ammonium carbamoselenoate 1 and (ii) thermolysis of 1 to form pure CO (99.9%) quantitatively. A Se–alcohol system is also usable but the results are inferior to that with a Se–amine system.
Crystal Structure of Potassium Hydrogen Terephthalate: Symmetric Hydrogen Bond in One-Dimensional Chain
Authors: Miyakubo Keisuke , Takeda Sadamu , Nakamura Nobuo 
Published: July 2006

Abstract
Crystal structure of potassium hydrogen terephthalate was determined by X-ray diffraction. Crystals have monoclinic unit cells with C2/c, a = 18.776(6), b = 3.761(3), c = 11.150(4) Å, β = 94.72(3)°, V = 784.6(6) Å3, and Z = 4. Acid anions form a one-dimensional chain linked by short (RO···O = 2.459(3) Å) and symmetric hydrogen bonds. The acidic hydrogen was distributed at two equivalent sites in the hydrogen bond.
Spectroscopic Study of the Conformational Dependence on Acid Dissociation of Phenoxypyridinium Cations
Authors: Uno Bunji , Kawakita Toshio , Kano Kenji , Okumura Noriko , Goto Masashi , Kubota Tanekazu 
Published: July 2006

Abstract
Thermodynamic constants for acid dissociation of the 2-, 3-, and 4-phenoxypyridinium, and 2-(2,6-xylyloxy)pyridinium cations were estimated by the spectroscopic method, and are extensively discussed in relation to the conformations around the bridging oxygen atom and the electronic states.
Dipole Moment of the Excited Tetracarbonyl(2,2′-bipyrazine)molybdenum
Authors: Shinozaki Kazuteru , Kaizu Youkoh 
Published: July 2006

Abstract
Visible absorption maxima of [Mo(CO)4(bpz)] and [Mo(CO)4(bpy)] depend on solvent, while their emission maxima are less sensitive to solvent. These molybdenum carbonyl complexes have a large dipole moment in the ground state, but a small dipole moment in the MLCT excited state. These results suggest that π back donation from metal to CO ligands occurs in the ground state, whereas a counter migration of the other electron from the ligands to metal accompanied by photoexcitation occurs in the MLCT state.
Kinetics and Mechanism of the Oxidative Cleavage of Unsaturated Acids by Quinolinium Dichromate
Authors: Nongkynrih Irona , Mahanti Mahendra K 
Published: July 2006

Abstract
Quinolinium dichromate (QDC) oxidizes cinnamic and crotonic acids smoothly in N,N-dimethylformamide in the presence of an acid. The reaction has a unit dependence on each of the substrate, oxidant, and acid concentrations. The mechanistic pathway involves an electrophilic attack of the oxidant on the double bond of the substrate, giving a carbonium-ion intermediate. This is supported by a small inverse kinetic isotope effect (kH/kD = 0.78) at the α-carbon and the value of ρ = −4.0.
Formylation of Aryl Halides with Carbon Monoxide and Sodium Formate in the Presence of Palladium Catalyst
Authors: Okano Tamon , Harada Nobuyuki , Kiji Jitsuo 
Published: July 2006

Abstract
The formylation of aryl bromides or iodides with HCOONa at atmospheric pressure of CO readily proceeded in the presence of PdCl2(PPh3)2 in DMF to afford the corresponding aldehydes in good yields. The contamination with water promoted a side reaction to form carboxylic acids. The formylation using HCOOK or HCOONH4 as a hydride source was fast but gave a considerable amount of the reduction product.
Side-Chain Bromination of Diphenylmethanes, 1,2-Diphenylethanes, and 10,11-Dihydro-5H-dibenzo[a,d]cycloheptenes with N-Bromosuccinimide under Irradiation of a Tungsten Lamp
Authors: Mataka Shuntaro , Liu Guo-Bin , Tori-i Akiyoshi , Tashiro Masashi 
Published: July 2006

Abstract
The photothermal bromination of diphenylmethane and methyl derivatives with N-bromosuccinimide afforded benzophenone and (polybromomethyl)benzophenones via the hydrolysis of dibromodiphenylmethanes. 1,2-Diphenylethane and p-t-butyl derivative gave dibromostilbenes, while the o-methyl derivative afforded bis(dibromomethyl)dibromodiphenylethane. 10,11-Dihydro-5H-dibenzo[a,d]cycloheptene gave 9-bromodibenzocycloheptenone, which was also obtained in the bromination of 10,11-dihydro-5H-dibenzo[a,d]cyclohepten-5-one.
An Improved Synthesis of (±)-Otonecine and a Synthesis of a 12-Membered Otonecine Diester
Authors: Niwa Haruki , Sakata Tomoyo , Yamada Kiyoyuki 
Published: July 2006

Abstract
(±)-4-Methyl-1-phenylthio-8-oxa-4-azabicyclo[5.2.1]decane-9,10-dione was efficiently converted into (±)-otonecine, which was regioselectively coupled with (E)-2-ethylidenehexanedioic acid to give a 12-membered otonecine diester.
Quantification Analysis of 3′-Splice Signal Sequences in mRNA Precursors. Mutations and Exon Skipping in Rabbit β-Globin Gene
Authors: Iida Yôichi 
Published: July 2006

Abstract
The signals which direct excision of introns from mRNA precursors in mammalian genes have been studied. The consensus sequence for the 3′-splice site is (T or C)11N(C or T) AG/G, where N is A, G, C or T, and where the stroke (/) indicates the boundary between intron and exon. In the present research, the nucleotide sequence at the 3′-splice junction in rabbit β-globin gene was analyzed by a quantification method proposed previously. Using a sample score of 16-nucleotide sequence at the 3′-splice junction, we proposed the strength of the 3′-splice signal. This approach could explain not only the location of the authentic 3′-splice sites in rabbit β-globin pre-mRNA but also the experimental results of various point mutations introduced into the 3′-splice region of the second intron. Our analysis also explains a skipping mechanism of the second exon, in which the first exon is spliced directly to the third exon if the 5′-splice site of the second intron is destroyed.
Crystal Structure of Organic Metamagnet: 4-Methacryloyloxy-2,2,6,6-tetramethyl-1-piperidinyloxyl (MOTMP)
Authors: Kajiwara Atsushi , Sugimoto Hiroyuki , Kamachi Mikiharu 
Published: July 2006

Abstract
Structures of 4-methacryloyloxy-2,2,6,6-tetramethyl-1-piperidinyloxyl (MOTMP) and 4-acryloyloxy-2,2,6,6-tetramethyl-1-piperidinyloxyl (AOTMP) which have one-dimensional ferromagnetic coupling and antiferromagnetic interactions, respectively, have been determined by X-ray crystallographic analysis. The crystals of both compounds are monoclinic and have space group P21 (No. 4) with Z = 2. The one-dimensional ordering of spins of NO radicals is explained by intermolecular superexchange interactions of NO radicals due to NO radical ···C=C–C=O···NO radical contacts shorter than the van der Waals radii sum (ca. 3.6 Å). The difference in magnetic behavior between MOTMP and AOTMP might be due to the difference in the torsion angle of the C=C–C=O moiety, as in the three-dimensional molecular arrangement in the crystals.
The Mechanism of the Enantioselective Photocyclization of 2-Piperidone in the Clathrate Crystal
Authors: Hashizume Daisuke , Ohashi Yuji , Tanaka Koichi , Toda Fumio 
Published: July 2006

Abstract
The achiral molecules of N-(arylcarbonylmethyl)-2-piperidones form 1 : 1 host–guest complexes with the chiral host molecule derived from tartaric acid. The guest molecules in the clathrate crystals are converted into the chiral 7-aryl-7-hydroxy-1-azabicyclo[4.2.0]octan-2-one derivatives with high optical yields on exposure to a high pressure Hg lamp. The crystal structures and absolute configurations of the clathrate compound (5a), which consists of (−)-(2R,3R)-2,3-bis(hydroxydiphenylmethyl)-1,4-dioxaspiro[4.5]decane (4) and N-(p-bromophenylcarbonylmethyl)-2-piperidone (1a), and of the chiral product of (−)-(6S,7S)-7-hydroxy-1-azabicyclo[4.2.0]octan-2-one (2a) were determined by X-rays. (5a) C34H34O4·C13H14NO2Br, fw = 802.81, monoclinic C2, a = 24.186(3), b = 9.550(3), c = 19.711(3) Å, β=116.18(1)°,V = 4086(2) Å3, Z = 4, final R became 0.047. (2a) C13H14NO2Br, fw = 296.16, orthorhombic, P212121, a = 7.047(2), b = 31.151(3), c = 5.696(2) Å, V = 1250.3(5) Å3, Z = 4, final R became 0.039. The enantioselectivity of the photocyclization is clearly explained by the two structures if we assume that the reaction proceeds topochemically.
Cadmium(53P1)-Photosensitized Luminescence of Some Compounds Containing Three Donor Atoms
Authors: Ahmed Omar , Sueishi Yoshimi , Nishimura Norio , Yamamoto Shunzo 
Published: July 2006

Abstract
The cadmium photosensitized luminescence of some compounds containing three donor atoms (N and/or O) has been investigated by the steady illumination method at temperatures between 453 and 553 K. Broad emission spectra in the visible region were observed with diethylenetriamine (DETA), dipropylenetriamine (DPTA), bis(2-methoxyethyl) ether (BMOEE), bis-2-methoxyethylamine (BMOEA), and bis-(dimethylaminoethyl) ether (BDAEE). By comparing each of these spectra with the spectra of the corresponding bifunctional compounds, we can resolved these spectra into three component bands for DETA, DPTA, BMOEE, and BMOEA, and into four component bands for BDAEE. The longest wavelength bands were observed for the first time. They can be assigned to different types of 1 : 1 exciplexes (acyclic, monocyclic, and bicyclic). The enthalpy changes of the chelations were evaluated from the temperature dependences of the intensities of the bands and were found to depend on the type of chelating atom.
Direct Determination of the Interaction Potentials of Ar–Xe, Kr–Xe, and Ar–Kr from the Extended Principle of Corresponding States
Authors: Goharshadi Elaheh K , Boushehri Ali 
Published: July 2006

Abstract
Intermolecular pair-potential energy functions are given for all the unlike interactions of Ar, Kr, and Xe. The potentials are determined by direct inversion of experimental reduced viscosity collision integrals obtained from the corresponding-states correlation. The results are in good agreement with the potentials proposed by Ron Aziz.
Synthesis, X-Ray Analysis, and Electrochemical Study of Some Manganese Carbonyl Derivatives with 1,1′-Bis(diphenylphosphino)ferrocene, dppfe
Authors: Onaka Satoru , Haga Masa-aki , Takagi Shigeru , Otsuka Mayumi , Mizuno Katuya 
Published: July 2006

Abstract
Synthesis and X-ray structure analyses were carried out for fac-cis-[MnCl(CO)3dppfe] and fac-cis-[MnH(CO)3dppfe], and a cyclic voltammetric study was made for a series of manganese carbonyl derivatives with 1,1′-bis(diphenylphosphino)ferrocene (dppfe), including these new compounds. Unusually a low oxidation potential for the Mn site is revealed for [Mn(MeCp)(CO)dppfe]. A good correlation between ν(CO) and the oxidation potential for the Mn atom has been clarified.
Oxidative Decomposition of Chlorobenzene over Calcium-Deficient Hydroxyapatite
Authors: Nishikawa Harumitsu , Monma Hideki 
Published: July 2006

Abstract
Gaseous chlorobenzene was decomposed into CO and CO2 by the oxidative reaction at 400—450 °C over calcium-deficient hydroxyapatite (DAp) prepared by an aqueous precipitation procedure. Phenol and benzene were not detected after the reaction. Most of the Cl in chlorobenzene was captured as Cl- in DAp by the reaction. On the other hand, the DAp prepared by the hydrolysis of α-tricalcium phosphate was inactive for the decomposition of chlorobenzene. The difference in the activity between the two DAp materials was attributed to the difference of their crystallinities.
Study of Synthetic Clay Minerals. III. Synthesis and Characterization of Two Dimensional Talc
Authors: Takahashi Noriyuki , Tanaka Masanori , Satoh Teiji , Endo Tadashi 
Published: July 2006

Abstract
“Two dimensional” talc was prepared by the hydrothermal reaction of various silicas with magnesium hydroxide. The precipitated and activated silicas were especially available as starting materials. The powder X-ray diffraction data indicated that the resulting talc consisted of no-stratified and random layered structure. According to the IR spectrum, no solid acidity, i.e. Brønsted and Lewis acid sites were found. The specific surface area was over 500 m2 g−1. A large amount of water was adsorbed and partially combined with the surface of lamellar talc. As a result, the artificial talc would receive applications such as emulsifying agents to the mixture of liquid paraffin and water.
The Structures of Azedarachins, Limonoid Antifeedants from Chinese Melia azedarach Linn
Authors: Huang Ruo Chun , Okamura Hiroaki , Iwagawa Tetsuo , Nakatani Munehiro 
Published: July 2006

Abstract
Three azedarachins, insect antifeedant limonoids, have been isolated from the root bark of Chinese Melia azedarach Linn (Meliaceae), along with six trichilins. Their structures show a 14,15-epoxide and a 19/29 acyl acetal bridge system, as elucidated by spectroscopic studies. They are antifeedants active against the larvae of Spodoptera exigua Hübner (Boisduval).
An Improved Asymmetrically-Modified Nickel Catalyst Prepared from Ultrasonicated Raney Nickel
Authors: Tai Akira , Kikukawa Tadashi , Sugimura Takashi , Inoue Yoshihisa , Abe Satoshi , Osawa Tsutomu , Harada Tadao 
Published: July 2006

Abstract
The ultrasonic irradiation of Raney nickel catalyst in water followed by the removal of the resulting turbid supernatant gave an excellent nickel catalyst (RNi-U) which generated an asymmetrically-modified nickel catalyst. An EPMA (SEM-EDX) study indicated that RNi-U consisted of a fairly pure nickel surface of homogeneous size. Tartaric acid–NaBr-modified RNi-U (TA–NaBr–MRNi-U) showed a high enantio-differentiating ability as well as reactivity in the hydrogenation of prochiral ketones such as 1,3-diones and 3-oxoalkanoic acid esters.