bluuebunny/crossref_metadata_2025_split huggingface dataset:
A high‐speed reclosing method to improve the stability in a power system
Authors: Yukita Kazuto , Kojima Daisuke , Yamada Hiroshi , Mizuno Katsunori , Goto Yasuyuki , Ichiyanagi Katsuhiro 
Published: February 2004

AbstractThis paper proposes a high‐speed reclosing operating method to improve the stability in a power system. The proposed method calculates the reclosing time, taking a standard case in which the reclosing is not done using the generator phase angle δ, and the angular velocity ω, and the field system voltage ed′. Also, the execution of reclosing time is calculated, while taking into consideration the acceleration/deceleration energy of the generator during a fault. It can be expected that δ is suppressed by this optimum reclosing operation. Therefore, the system stability can be expected to improve by carrying out high‐speed reclosing when a fault occurs. At present, it has been set at a value which seems to be optimal considering various problems in the reclosing time. However, in those methods, the system stability improvement effect cannot be expected. It was demonstrated that the high‐speed reclosing method serves to depress δ in the computer simulation. © 2004 Wiley Periodicals, Inc. Electr Eng Jpn, 147(2): 13–21, 2004; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/eej.10317
A study of collaborative operation between a new energy type dispersed power supply system and SMES by modified Euler type moving average prediction model
Authors: Monai Toshiharu , Takano Ichiro , Nishikawa Hisao , Sawada Yoshio 
Published: February 2004

AbstractIn this paper, the modified Euler type Moving Average Prediction (EMAP) model is proposed in order to operate a dispersed power supply system using new energy in autonomous mode. Furthermore, the EMAP model is used to operate a new type of dispersed power supply system consisting of a large‐scale photovoltaic system (PV), a fuel cell (FC), and a small‐scale superconducting magnetic energy storage system (SMES). This distributed power supply system can meet the multiple‐quality electric power requirements of customers, and ensures voltage stability and UPS (Uninterruptible Power Supply) functions as well. Each subsystem of this distributed power supply contributes to the above‐mentioned system performance with its own excellent characteristics. Moreover, the response characteristics of this system are confirmed by simulation with PSIM software, and, using collaborative operation under the EMAP model, the required capacity of SMES to compensate the fluctuation of both PV output and load demand is examined by simulation, using MATLAB/Simulink. © 2004 Wiley Periodicals, Inc. Electr Eng Jpn, 147(2): 1–12, 2004; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/eej.10318
A basic study of defect inspection methods for ASIC manufacturing line (Second report: Inspection parameter dependence on yield and cleaning cycle)
Authors: Sakurai Koichi , Fujii Susumu , Kaihara Toshiya 
Published: February 2004

AbstractThe results of strict defect control include both the enhancement of manufacturing yield and increased delivery delay due to a drop in the machine operation rate. Therefore, defect inspection methods must be optimized for this trade‐off, especially for ASIC manufacturing. In the first paper, we proposed a new manufacturing model which treats not only inspection and the yield model, but also the workflow model. In this paper, we formulate the inspection parameter dependence on the manufacturing yield and the machine cleaning cycle, which may affect delivery time. By using the resulting formulas, factory engineers can obtain practical information for inspection parameter optimization. © 2004 Wiley Periodicals, Inc. Electr Eng Jpn, 147(2): 53–62, 2004; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/eej.10328
Direct Hydride/Silyl Exchange — Synthesis and X‐ray Study of the Bis(silyl) Complex [Cp2NbH(SiCl3)2]
Authors: Dorogov Konstantin Yu. , Churakov Andrei V. , Kuzmina Lyudmila G. , Howard Judith A. K. , Nikonov Georgii I. 
Published: February 2004

AbstractNiobocene trihydride reacts directly with the chlorosilanes SiCl2R′R′′ (R′, R′′ = Me, Ph) and SiCl3Me to give the dihydridomonosilyl derivatives [Cp2Nb(H)2(SiClnR3−n)] (n = 1, 2), whereas the analogous reaction with SiCl4 affords [Cp2Nb(H)2(SiCl3)] and the bis(silyl) complex [Cp2NbH(SiCl3)2], whose X‐ray structure was determined. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2004)
Tuning the Catalase Activity of Dinuclear Manganese Complexes by Utilizing Different Substituted Tripodal Ligands
Authors: Reddig Nicole , Pursche Daniel , Kloskowski Michael , Slinn Caroline , Baldeau Sascha M. , Rompel Annette 
Published: February 2004

AbstractA series of five new dinuclear manganese(II/II) compounds with derivatives of 2‐{[bis(pyridin‐2‐ylmethyl)amino]methyl}phenol (HL1) were synthesized and structurally characterized. All complexes crystallize in monoclinic space groups and exhibit Mn···Mn separations in the range of 3.392(8)−3.493(2) Å caused by bis(µ‐phenoxo) bridging modes. The derivatives of HL1 contain either electron‐donating or ‐withdrawing substituents. A correlation between the electronic character of the different ring substituents, the redox potentials of the dinuclear transition metal complexes and the catalase activity has been revealed. In analogy to manganese catalase, all complexes show saturation kinetics at high substrate concentration. The investigated catalase activity places the compounds in the upper range of functional catalase mimics. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2004)
A Bis(diazadiene) Adduct of MoCl2: Mononuclear, Octahedral, Undistorted and Diamagnetic
Authors: Stoffelbach François , Rebière Bertrand , Poli Rinaldo 
Published: February 2004

AbstractThe complex [MoCl2(iPr2dad)2] (iPr2dad = iPrN=CH−CH=N−iPr) is obtained in one step by reduction of [MoCl3(THF)3] in the presence of iPr2dad. The X‐ray structure reveals a relatively undistorted octahedral coordination geometry with a relative cis configuration and points to a more appropriate description of the ligands as enediamides. The NMR investigation is in agreement with the same cis structure in solution and underlines the diamagnetism of the compound, at odds with previously reported very similar complexes. A bulk magnetic susceptibility measurement further confirms the compound’s diamagnetism. No equilibrium with a dinuclear, metal‐metal bonded species is apparent from the solution studies. A DFT calculation on the real molecule and on two R2dad model systems with R = Ph and 4‐HOC6H4 reveals how the ligand periphery delicately controls the magnetic and structural properties of this system. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2004)
Template Synthesis, Crystal Structure and Luminescent Properties of Neutral N4O3 Tripodal LnIIIL Complexes (LnIII = La3+, Eu3+, Gd3+, Tb3+, Dy3+, Ho3+, Er3+, Tm3+ or Lu3+; H3L = Tris{[3′‐(2′′‐pyridyl)‐5′‐tert‐butyl‐2′‐hydroxybenzylidene‐2‐imino]ethyl}amine)
Authors: Wong Wai‐Kwok , Liang Hongze , Guo Jianping , Wong Wai‐Yeung , Lo Wing‐Kit , Li King‐Fai , Cheah Kok‐Wai , Zhou Zhongyuan , Wong Wing‐Tak 
Published: February 2004

AbstractIn the presence of Ln3+ (Ln = La, Eu, Gd, Tb, Dy, Ho, Er, Tm or Lu), tris(2‐aminoethyl)amine condensed with three equivalents of 3‐(2′‐pyridyl)‐5‐tert‐butyl‐2‐hydroxybenzaldehyde in methanol to give the neutral Schiff‐base complex LnIIIL (Ln = La 1, Eu 2, Gd 3, Tb 4, Dy 5, Ho 6, Er 7, Tm 8 and Lu 9; H3L = tris{[3′‐(2′′‐pyridyl)‐5′‐tert‐butyl‐2′‐hydroxybenzylidene‐2‐imino]ethyl}amine). The structures of compounds 4−7 were determined by X‐ray crystallography. The crystal structure analyses revealed that the Schiff base behaves as a tri‐deprotonated heptadentate ligand encapsulating the lanthanide metal ion within the N4O3 cavity, with all the pyridyl groups being pendant. Solution spectroscopic data suggest that the LnIIIL complexes remain intact in methanol and exist as nine‐coordinate non‐electrolytes with the lanthanide metal ions coordinated to the N4O3 cavity of the tripodal Schiff base and two solvent molecules. The solution photoluminescent properties of these lanthanide Schiff‐base complexes were also examined. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2004)
Kinetic Studies of the Oxidative Addition and Transmetallation Steps Involved in the Cross‐Coupling of Alkynyl Stannanes with Aryl Iodides Catalysed by η2‐(Dimethyl fumarate)(iminophosphane)palladium(0) Complexes
Authors: Crociani Bruno , Antonaroli Simonetta , Canovese Luciano , Uguagliati Paolo , Visentin Fabiano 
Published: February 2004

AbstractThe complexes [Pd(η2‐dmfu)(P−N)] {dmfu = dimethyl fumarate; P−N = 2‐(PPh2)C6H4−1‐CH=NR, R = C6H4OMe‐4 (1a), CHMe2 (2a), C6H3Me2‐2,6 (3a), C6H3(CHMe2)2‐2,6 (4a)} undergo dynamic processes in solution which consist of a P−N ligand site exchange through initial rupture of the Pd−N bond at lower energy and an olefin dissociation‐association at higher energy. According to equilibrium constant values for olefin replacement, the complex [Pd(η2‐fn)(P−N)] (fn = fumaronitrile, 1b) has a greater thermodynamic stability than its dmfu analogue 1a. The kinetics of the oxidative addition of ArI (Ar = C6H4CF3‐4) to 1a and 2a lead to the products [PdI(Ar)(P−N)] (1c, 2c) and obey the rate law, kobs = k1A + k2A[ArI]. The k1A step involves oxidative addition to a reactive species [Pd(solvent)(P−N)] formed from dmfu dissociation. The k2A step is better interpreted in terms of oxidative addition to a species [Pd(η2‐dmfu)(solvent)(κ1‐P−N)] formed in a pre‐equilibrium step from Pd−N bond breaking. The complexes 1c and 2c react with PhC≡CSnBu3 in the presence of an activated olefin (ol = dmfu, fn) to yield the palladium(0) derivatives [Pd(η2‐ol)(P−N)] along with ISnBu3 and PhC≡CAr. The kinetics of the transmetallation step, which is rate‐determining for the overall reaction, obey the rate law: kobs = k2T[PhC≡CSnBu3]. The k2T values are markedly enhanced in more polar solvents such as CH3CN and DMF. The solvent effect and the activation parameters suggest an associative SE2 mechanism with substantial charge separation in the transition state. The kinetic data of the above reactions in various solvents indicate that, for the cross‐coupling of PhC≡CSnBu3 with ArI catalysed by 1a or 2a, the rate‐determining step is represented by the oxidative addition and that CH3CN is the solvent in which the highest rates are observed. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2004)
Synthesis, Structure and Hydrolytic Properties of a Family of New Zn Complexes Containing Hexaazamacrocyclic Ligands
Authors: Costas Miquel , Anda Carmen , Llobet Antoni , Parella Teodor , Stoeckli Evans Helen , Pinilla Elena 
Published: February 2004

AbstractThe synthesis, structure and spectroscopic properties of a family of Zn complexes containing a dinucleating hexaazamacrocyclic ligand (L) and anionic ligands (X) of general formula [Zn2(X)4−n(L)]n+ (1−8; L = H2p, H3p, Me2p, Me2m, Me3p, Me3m; X = Cl, n = 0; X = NO3, n = 2) have been investigated. The solid‐state structural characterisation has been performed by means of X‐ray diffraction analysis for complexes 3, 5, 7·1/3CH2Cl2 and 8. The Zn complexes 5, 7·1/3CH2Cl2 and 8 containing chloride ligands present a distorted N2Cl2 tetrahedral coordination with two non‐coordinated N atoms of the macrocyclic ligand. On the other hand, complex 3, which contains nitrate ligands, displays an N3O2 pentacoordination with all the N atoms of the macrocyclic ligand bonded to the metal centres. The different factors governing the relative Zn−Zn disposition are discussed. NMR spectroscopy in solution reveals the presence of fluxional behaviour and a completely different structural arrangement than in the solid state. In particular, evidence for the formation and breaking of Zn−N bonds involving all the macrocyclic ligand aminic N atoms is obtained for the chloride complexes 2 and 4−8. Finally, complexes 1, 3, 5 and 7 hydrolyse p‐nitrophenyl acetate (NA) with second‐order rate constants ranging from 0.045 to 0.193 M−1s−1, thus manifesting the influence of the ligands over the hydrolytic activity. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2004)
Synthesis, Structures and Reactions of Novel 9,10‐Dihydro‐9,10‐distannaanthracenes
Authors: Saito Masaichi , Henzan Natsumi , Nitta Minehiko , Yoshioka Michikazu 
Published: February 2004

AbstractA method for the synthesis of 9,10‐dihydro‐9,10‐distannaanthracenes has been improved and applied to the synthesis of novel unsymmetrical 9,10‐dihydro‐9,10‐distannaanthracenes. The first 9,9,10,10‐tetrahalo‐9,10‐dihydro‐9,10‐distannaanthracenes were successfully synthesized by halogenation of 9,9,10,10‐tetrakis(p‐methoxyphenyl)‐9,10‐dihydro‐9,10‐distannaanthracene. The structures of the newly obtained 9,10‐dihydro‐9,10‐distannaanthracenes were determined by X‐ray analysis. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2004)
The Dynamic Status Quo of Polyhedral Silsesquioxane Coordination Chemistry
Authors: Hanssen Rob W. J. M. , van Santen Rutger A. , Abbenhuis Hendrikus C. L. 
Published: February 2004

AbstractThe chemistry of polyhedral oligomeric silsesquioxanes (POSS) has taken a tremendous leap over the past decade. New synthetic approaches have been developed, and new complexes based on elements throughout the periodic table have been synthesized and applied in catalytic processes such as alkene epoxidation, Oppenauer oxidation, alkene polymerization, Diels−Alders reactions and alkene metathesis. The use of silsesquioxane ligands as models for silica surface has provided an intimate knowledge of the reactions on the surface of this much‐used support. New methods have been developed to incorporate silsesquioxanes into new materials. Encapsulation in siloxane polymers has provided precision supports for catalysts and controlled calcination has produced materials with well‐defined metal oxide particles. This paper reviews the history and the latest developments of silsesquioxane chemistry. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2004)
A Comparison of the Reactivity of Chloroalkanes and Chlorosilanes towards Activated PtII Complexes by DFT Calculations
Authors: Sturmayr Dietmar , Schubert Ulrich 
Published: February 2004

AbstractThe pathways of the C−Cl bond activation of CCl4 and CH3Cl by the 14‐electron PtII complexes [PtMe2(PH3)] or the corresponding reactions of SiCl4 and SiH3Cl with [PtMe(SiH3)(PH3)] were investigated by DFT calculations. The complexes [Pt(EH3)Me(PH3)] (E = C, Si) are models for [Pt(EH3)Me{(κ2‐P,N)‐Ph2PCH2CH2NMe2}], with hemilabile P,N chelating ligands, used in practical experiments. While the reaction of [Pt(EH3)Me(PH3)] with ECl4 results in an EH3/ECl3 exchange, reaction of [Pt(EH3)Me(PH3)] with EH3Cl results in the elimination of E2H6. Both reactions proceed via a five‐coordinate PtIV intermediate. The elimination of Si2H6 is endothermic. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2004)
Structural Snapshots of a Dynamic Coordination Sphere in Model Complexes for Catechol 1,2‐Dioxygenases
Authors: Merkel Michael , Schnieders David , Baldeau Sascha M. , Krebs Bernt 
Published: February 2004

AbstractA series of mononuclear iron(III) complexes as models for intradiol cleaving catechol dioxygenases has been synthesized. In all six compounds, the iron(III) core is coordinated by the ligand [(6‐bromo‐2‐pyridyl)methyl]bis[(2‐pyridyl)methyl]amine (brtpa) which mimics the endogenous ligands of this enzyme class and their dynamic behavior. Its steric hindrance pushes the α‐substituted pyridine arm of the ligand away from the coordination site in the presence of nucleophiles. This effect turns the iron‐brtpa system into an excellent model system for the first step in the reaction mechanism of intradiol cleaving chatechol dioxygenases. The proton acceptor abilities of the bromopyridyl arm are underlined by a hydrogen bond to a coordinated methanol molecule in one of the new compounds and by base dependent kinetic investigations. The presented model system is an effective catalyst that requires between 0.5 and 1.0 fewer equivalents of external base than most other complexes due to the integration of an internal base. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2004)
Dihydrobis(pyrazolyl)borate Alkylidyne Complexes of Tungsten
Authors: Hill Anthony F. , Malget John M. , White Andrew J. P. , Williams David J. 
Published: February 2004

Abstract[W(≡CR)Br(CO)2(NC5H4Me‐4)2] (R = C6H3Me2‐2,6 1a, C6H2Me3‐2,4,6 1b) react with K[H2B(pz)2] (pz = pyrazol‐1yl) to provide two interconverting isomers of [W(≡CR)(CO)2(NC5H4Me‐4){H2B(pz)2}] (2), one isomer having been structurally characterised for R = C6H3Me2‐2,6 (2a). The reactions of [W(≡CR)Br(CO)2(CNR′)2] (5: R′ = C6H3Me2‐2,6, CNMe3) with K[H2B(pz)2] or of [W(≡CR)Br(CO)2(NC5H4Me‐4){H2B(pz)2}] (2) with isocyanides are more complex due to the facile formation of unstable ketenyl derivatives. In the absence of light, the reaction of [W(≡CR)Br(CO)2(CNR′)2] (5) with K[H2B(pz)2] provides [W(≡CR)(CO)2(CNR′){H2B(pz)2}] (3) in moderate yield, similar yields were obtained from [W(≡CR)(CO)2(NC5H4Me‐4){H2B(pz)2}] (2) and CNR′. Under mild photolytic conditions both combinations provide primarily the thermally unstable ketenyl complex [W(η2‐OCCR)(CO)(CNR′)2{H2B(pz)2}] (4). The picoline ligand in [W(≡CR)Br(CO)2(NC5H4Me‐4){H2B(pz)2}] (2) is readily replaced by PMe2Ph to provide [W(≡CR)(CO)2(PMe2Ph){H2B(pz)2}] (structurally characterised for R = C6H3Me2‐2,6 6a). The reaction of either [W(≡CR)(CO)2(PMe2Ph){H2B(pz)2}] (6) or [W(≡CR)(CO)2(NC5H4Me‐4){H2B(pz)2}] (R = C6H2Me3‐2,4,6 2b) with excess PMe2Ph provides [W(≡CR)(CO)(PMe2Ph)2{H2B(pz)2}] (7). This complex is also obtained from K[H2B(pz)2] and [W(≡CR)Br(CO)(PMe2Ph)3] (8), the latter arising from the reaction of [W(≡CR)Br(CO)2(NC5H4Me‐4)2] (1b) with PMe2Ph. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2004)
New Bulky Bis(amino)cyclodiphosph(III)azanes and Their Titanium(IV) Complexes: Synthesis, Structures and Ethene Polymerization Studies
Authors: Axenov Kirill V. , Kotov Vasily V. , Klinga Martti , Leskelä Markku , Repo Timo 
Published: February 2004

AbstractBis(amino)cyclodiphosph(III)azanes cis‐[(RNH)(PN‐tBu)]2, R = 2,6‐iPr2C6H3 (2), 2‐tBuC6H4 (3), 2‐CF3C6H4 (4), 2,5‐tBu2C6H3 (5), Ph2CH (6), 2,4‐Me2C6H3 (7), 2,6‐Et2C6H3 (8), have been synthesized in the presence of Et3N by a nucleophilic substitution reaction of cis‐(ClPN‐tBu)2 (1) with the corresponding bulky aryl and alkylamines. The bis(amino)cyclodiphosph(III)azanes 2−8 adopt the thermodynamically stable cis‐configuration − a prerequisite for efficient metal complex formation. Deprotonation of bis(amino)cyclodiphosph(III)azanes with nBuLi slowly afforded the corresponding salts, cis‐[(2,4‐Me2C6H3N)(PN‐tBu)]2Li2(THF)2. The crystal structure of cis‐[(2,4‐Me2C6H3N)(PN‐tBu)]2Li2(THF)2 (9) consists of a heterocube of two lithium atoms, two nitrogen atoms and a cyclodiphosph(III)azane ring. Transmetallation of Li compounds by TiCl4 was unselective and led to a complex mixture of products. The direct reaction of cis‐bis(amino)cyclodiphosph(III)azanes with Ti(NMe2)4 is the most efficient method to prepare the corresponding titanium(IV) bis‐amido complexes cis‐[(RN)(PNtBu)]2Ti(NMe2)2 (11a, 12a, 14a, 15a). In the solid state, cis‐[(PhN)(PN‐tBu)]2Ti(NMe2)2 (11a) adopts a highly distorted trigonal‐bipyramidal configuration at the metal center. These bis‐amido titanium(IV) complexes have been subsequently transformed into the dichlorides cis‐[(RN)(PN‐tBu)]2TiCl2 (12−15) with Me3SiCl. After MAO activation the complexes possess moderate catalytic activity in ethene polymerization and produce linear polyethylene with molar masses of up to 2.6 × 106 g/mol and with narrow polydispersities. The catalytic activity and polymer properties depend strongly on the bulkiness of the ligand substituents; cis‐[(2,6‐iPr2C6H3N)(PN‐tBu)]2TiCl2 (14) gave the highest activity (231 kg PE/molcat × bar × h). (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2004)
Iridium Complexes with Chiral and Achiral β‐Aminophosphane Ligands: Catalysts for >C=O Hydrogenation and H/D Exchange Involving both Homo‐ and Heterolytic H2 Activation
Authors: Dahlenburg Lutz , Götz Rainer 
Published: February 2004

AbstractChiral and achiral P,N‐chelated IrI complexes of the general type [(COD)Ir(P∩NR1R2)]BF4, where COD = η4‐1,5‐C8H12 and P∩NR1R2 = (1R,2R)‐, (1S,2S)‐, or (1R,2S)‐Ph2PC1H(Ph)C2H(Me)NR1R2 (NR1R2 = NH2, NHMe, NHCH2Ph, NHCHMe2, NMe2), Ph2PCH2CR2NH2 (R = H, Me), or 2‐Ph2PC6H4NHMe, have been prepared by treating [Ir(COD)2]BF4 with the required β‐aminophosphane in THF. The monolithiated ligands Ph2PCH2CMe2N(Li)H and 2‐Ph2PC6H4N(Li)Me interacted with [{(COD)Ir(μ‐Cl)}2] to give the neutral alkyl‐ and arylamido compounds [(COD)Ir(Ph2PCH2CMe2NH)] and [(COD)Ir(2‐Ph2PC6H4NMe)]. All IrI complexes [(COD)Ir(P∩NR1R2)]BF4 acted as catalysts for the direct hydrogenation of alkyl aryl ketones to the corresponding 1‐phenylalkanols, if combined with an alkaline or amine base in methanol under H2 (10−50 bar) between 25 and 50 °C. The reaction occurred with modest to moderate enantioselectivity (ca. 20−75% ee) if chelate complexes bearing the various optically active β‐aminophosphanes were used as catalysts. The base‐free amido complexes [(COD)Ir(P∩NR)] displayed similar catalytic activity to the combined systems [(COD)Ir(P∩NHR)]BF4−KOH (P∩NHR = Ph2PCH2CMe2NH2, 2‐Ph2PC6H4NHMe). The ability of both the cationic β‐amino‐ and the neutral β‐amidophosphane IrI complexes to undergo oxidative H2 addition and the observation of H2/D+ as well as H2/D2 exchange processes during catalysis provided evidence for a mechanism involving reversible “[IrIII(H)2−P∩NHR]+ ↔ [(η2‐H2)−IrIII(H)−P∩NR]+” proton‐to‐hydride transfer and heterolytic H2 cleavage on amino−dihydride and amido−dihydrogen−monohydride tautomers. The crystal structures of [(COD)Ir{(1S,2S)‐Ph2PCH(Ph)CH(Me)NHCH2Ph}]BF4·2THF, [(COD)Ir{1R,2S‐Ph2PCH(Ph)CH(Me)NHMe}]BF4·THF, and the orthometalated 18e IrI complex [(COD)Ir{(1R,2S)‐Ph2PCH(C6H4‐o)CH(Me)NHCHMe2}], which resulted from treatment of [(COD)Ir{(1R,2S)‐Ph2PCH(Ph)CH(Me)NHCHMe2}]BF4 with excess KOH, have been determined by single crystal X‐ray diffraction studies. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2004)