bluuebunny/crossref_metadata_2025_split huggingface dataset:
Enhanced Group II mGluR-Mediated Inhibition of Pain-Related Synaptic Plasticity in the Amygdala
Authors: Han Jeong S , Fu Yu , Bird Gary C , Neugebauer Volker 
Published: May 2006

Background The latero-capsular part of the central nucleus of the amygdala (CeLC) is the target of the spino-parabrachio-amygdaloid pain pathway. Our previous studies showed that CeLC neurons develop synaptic plasticity and increased neuronal excitability in the kaolin/carrageenan model of arthritic pain. These pain-related changes involve presynaptic group I metabotropic glutamate receptors (mGluRs) and postsynaptic NMDA and calcitonin gene-related peptide (CGRP1) receptors. Here we address the role of group II mGluRs. Results Whole-cell current- and voltage-clamp recordings were made from CeLC neurons in brain slices from control rats and arthritic rats (>6 h postinjection of kaolin/carrageenan into the knee). Monosynaptic excitatory postsynaptic currents (EPSCs) were evoked by electrical stimulation of afferents from the pontine parabrachial (PB) area. A selective group II mGluR agonist (LY354740) decreased the amplitude of EPSCs more potently in CeLC neurons from arthritic rats (IC50 = 0.59 nM) than in control animals (IC50 = 15.0 nM). The inhibitory effect of LY354740 was reversed by a group II mGluR antagonist (EGLU) but not a GABAA receptor antagonist (bicuculline). LY354740 decreased frequency, but not amplitude, of miniature EPSCs in the presence of TTX. No significant changes of neuronal excitability measures (membrane slope conductance and action potential firing rate) were detected. Conclusion Our data suggest that group II mGluRs act presynaptically to modulate synaptic plasticity in the amygdala in a model of arthritic pain.
Indications for conservative management of scoliosis (guidelines)
Authors:   SOSORT guideline committee, Weiss Hans-Rudolf , Negrini Stefano , Rigo Manuel , Kotwicki Tomasz , Hawes Martha C , Grivas Theodoros B , Maruyama Toru , Landauer Franz 
Published: May 2006

Abstract
This guideline has been discussed by the SOSORT guideline committee prior to the SOSORT consensus meeting in Milan, January 2005 and published in its first version on the SOSORT homepage: http://www.sosort.org/meetings.php. After the meeting it again has been discussed by the members of the SOSORT guideline committee to establish the final 2005 version submitted to Scoliosis, the official Journal of the society, in December 2005.
Arginine-vasopressin in catecholamine-refractory septic versus non-septic shock in extremely low birth weight infants with acute renal injury
Authors: Meyer Sascha , Gottschling Sven , Baghai Ali , Wurm Donald , Gortner Ludwig 
Published: May 2006

Abstract
Introduction
The aim of this study was to assess the efficacy of arginine-vasopressin (AVP) as a rescue therapy in catecholamine-refractory septic and non-septic shock in extremely low birth weight (ELBW) infants with acute renal injury.

Methods
Prospective assessment of AVP therapy in three ELBW infants with catecholamine-refractory septic shock and acute renal injury (mean birth weight 600 ± 30 g) and three ELBW infants with non-septic shock and acute renal injury (mean birth weight 770 ± 110 g) at a University hospital. The main outcome measures were restoration of blood pressure with adequate organ perfusion and survival at discharge.

Results
In all three ELBW infants with catecholamine-resistant septic shock, systemic arterial blood pressure increased substantively with restoration of urine output after AVP administration (dosage, 0.035 to 0.36 U/kg/h; length, 70 ± 21 hours). In the three ELBW infants with non-septic shock, only a transient stabilization in mean arterial pressure with restoration of urine output was observed after AVP therapy (dosage, 0.01 to 0.36 U/kg/h; length, 30 ± 16 hours). The mortality rate was 1/3 in the sepsis group versus 3/3 in the non-septic group.

Conclusion
AVP may be a promising rescue therapy in catecholamine-resistant shock in ELBW infants with acute renal injury. Larger prospective clinical trials are warranted to assess the efficacy and safety of AVP as a pressor adjunct in septic versus non-septic shock in ELBW infants.
RNA interference is not involved in natural antisense mediated regulation of gene expression in mammals
Authors: Faghihi Mohammad Ali , Wahlestedt Claes 
Published: May 2006

Abstract
Background
Antisense transcription, yielding both coding and non-coding RNA, is a widespread phenomenon in mammals. The mechanism by which natural antisense transcripts (NAT) may regulate gene expression are largely unknown. The aim of the present study was to explore the mechanism of reciprocal sense-antisense (S-AS) regulation by studying the effects of a coding and non-coding NAT on corresponding gene expression, and to investigate the possible involvement of endogenous RNA interference (RNAi) in S-AS interactions.

Results
We have examined the mechanism of S-AS RNA base pairing, using thymidylate synthase and hypoxia inducible factor-1α as primary examples of endogenous genes with coding and non-coding NAT partners, respectively. Here we provide direct evidence against S-AS RNA duplex formation in the cytoplasm of human cells and subsequent activation of RNAi.

Conclusion
Collectively, our data demonstrate that NAT regulation of gene expression occurs through a pathway independent of Dicer associated RNAi. Moreover, we introduce an experimental strategy with utility for the functional examination of other S-AS pair interactions.
Quantitative Fluoroestradiol Positron Emission Tomography Imaging Predicts Response to Endocrine Treatment in Breast Cancer
Authors: Linden Hannah M. , Stekhova Svetlana A. , Link Jeanne M. , Gralow Julie R. , Livingston Robert B. , Ellis Georgiana K. , Petra Philip H. , Peterson Lanell M. , Schubert Erin K. , Dunnwald Lisa K. , Krohn Kenneth A. , Mankoff David A. 
Published: May 2006

PurposeIn breast cancer, [18F]fluoroestradiol (FES) positron emission tomography (PET) correlates with estrogen receptors (ER) expression and predicts response to tamoxifen. We tested the ability of FES-PET imaging to predict response to salvage hormonal treatment in heavily pretreated metastatic breast cancer patients, predominantly treated with aromatase inhibitors.Patients and MethodsInitial FES uptake measurements in 47 patients with ER-positive tumors were correlated with subsequent tumor response to 6 months of hormonal treatment. Most patients had bone dominant disease and prior tamoxifen exposure. Response was compared to initial FES-PET uptake, measured qualitatively and quantitatively using standardized uptake value (SUV) and estradiol-binding flux.ResultsEleven of 47 patients (23%) had an objective response. While no patients with absent FES uptake had a response to treatment, the association between qualitative FES-PET results and response was not significant (P = .14). However, quantitative FES uptake and response were significantly associated; zero of 15 patients with initial SUV less than 1.5 responded to hormonal therapy, compared with 11 of 32 patients (34%) with SUV higher than 1.5 (P < .01). In the subset of patients whose tumors did not overexpress HER2/neu, 11 of 24 patients (46%) with SUV higher than 1.5 responded.ConclusionQuantitative FES-PET can predict response to hormonal therapy and may help guide treatment selection. Treatment selection using quantitative FES-PET in our patient series would have increased the rate of response from 23% to 34% overall, and from 29% to 46% in the subset of patients lacking HER2/neu overexpression. A multi-institutional collaborative trial would permit definitive assessment of the value of FES-PET for therapeutic decision making.
Patterns of Cancer Incidence, Mortality, and Prevalence Across Five Continents: Defining Priorities to Reduce Cancer Disparities in Different Geographic Regions of the World
Authors: Kamangar Farin , Dores Graça M. , Anderson William F. 
Published: May 2006

Efforts to reduce global cancer disparities begin with an understanding of geographic patterns in cancer incidence, mortality, and prevalence. Using the GLOBOCAN (2002) and Cancer Incidence in Five Continents databases, we describe overall cancer incidence, mortality, and prevalence, age-adjusted temporal trends, and age-specific incidence patterns in selected geographic regions of the world. For the eight most common malignancies—cancers of lung, breast, colon and rectum, stomach, prostate, liver, cervix, and esophagus—the most important risk factors, cancer prevention and control measures are briefly reviewed.In 2002, an estimated 11 million new cancer cases and 7 million cancer deaths were reported worldwide; nearly 25 million persons were living with cancer. Among the eight most common cancers, global disparities in cancer incidence, mortality, and prevalence are evident, likely due to complex interactions of nonmodifiable (ie, genetic susceptibility and aging) and modifiable risk factors (ie, tobacco, infectious agents, diet, and physical activity). Indeed, when risk factors among populations are intertwined with differences in individual behaviors, cultural beliefs and practices, socioeconomic conditions, and health care systems, global cancer disparities are inevitable. For the eight most common cancers, priorities for reducing cancer disparities are discussed.
Diastereo-Differentiating Isomerization of Meso 3,4-Epoxycyclopentanone Ketal to a Chiral 4-Hydroxy-2-cyclopentenone Ketal
Authors: Yoshikawa Masato , Sugimura Takashi , Tai Akira 
Published: May 2006

Abstract
A new type diastereo-differentiating isomerization of meso 3,4-epoxycyclopentanone carrying a chiral diol as ketal to give 4-hydroxy-2-cyclopentenone ketals was demonstrated in a ratio of up to 87.7 to 12.3.
External Heavy Atom Effect on Intersystem Crossing of Radical Pair in Solvent Cage. Photoreactions of Phthalazine
Authors: Inoue Hiroyasu , Sakurai Tadamitsu , Hoshi Toshihiko , Okubo Jun , Ono Isao 
Published: May 2006

Abstract
External heavy atom effects have been studied for the photoreaction of phthalazine in 2-propanol. Addition of bromine containing compounds alters the product distribution in the dual photoreactions occurred simultaneously. The results can be interpreted in terms of enhancement of the intersystem crossing from the triplet radical pair to the singlet radical pair, including the spin inversion within the solvent cage.
A Bis-Fenced Porphinatoiron Having Seven Pivaloyloxy Groups on the Porphyrin Ring Plane. Synthesis and Ligand Binding
Authors: Tsuchida Eishun , Hasegawa Etsuo , Komatsu Teruyuki , Nakao Keisuke , Nishide Hiroyuki 
Published: May 2006

Abstract
A new tetraphenylporphyrin derivative having two pockets on both sides of the porphyrin ring plane, 5,10,15-tri(2′,6′-bis(pivaloyloxy)phenyl)-20-((2′-hydroxy-6′-pivaloyloxy)phenyl)porphine, and its iron complex were synthesized. The 1,2-dimethylimidazole binding to the iron(II) was enhanced by the presence of a steric-hindrance reduced pocket. The complex formed a stable dioxygen adduct in toluene at 25°C.
Micelle Formation of a Sulfobetaine Derivative of Cholic Acid
Authors: Funasaki Noriaki , Hada Sakae , Neya Saburo 
Published: May 2006

Abstract
A gel filtration chromatographic study of CHAPS, a nondenaturing zwitterionic surfactant, reveals a step-wise self-association of CHAPS, which provides important information about its use for membrane biochemistry and about micelle formation of bile salts.
Agarose-Poly(9-vinyladenine) Conjugated Gel. Application for Electrophoretic Separation of Nucleic Acids
Authors: Yashima Eiji , Suehiro Natsumi , Akashi Mitsuru , Miyauchi Noriyuki 
Published: May 2006

Abstract
Poly(9-vinyladenine) was conjugated with agarose gel to see the interaction with RNA (polyA and polyU) and DNA for electrophoresis. The conjugated gel showed the nucleobase selective separation for RNA and could discriminate between single-stranded and double-stranded DNA.
Transportation of Carbonaceous Mesophase Spherules in Pitch to the Anode
Authors: Yoshioka Masahiko , Miyake Mikio , Ida Toru , Nomura Masakatsu 
Published: May 2006

Abstract
A pitch containing carbonaceous mesophase spherules was treated at 300 °C for 10 min in an electric field stronger than 600 V/cm. The spherules are transported to the anode without coalescence and aligned with aromatic lamellae parallel to the direction of electric field.
Ion-Pair Recombination of a Carbocation and Hydroxide Ion Observed in Solvolytic Media by Laser Photolysis of 9-Aryl-9-xanthenol
Authors: Okuyama Tadashi , Ueno Kenji , Morishima Yotaro , Kamachi Mikiharu , Fueno Takayuki 
Published: May 2006

Abstract
9-p-Methoxyphenyl-9-xanthenylium ion is generated by laser photolysis of the corresponding xanthenol in aqueous ethanol. The time-dependent absorbance change shows a biphasic first-order decay with halflives of 10−4 and 10−2 s. The rapid reaction is ascribed to the ion-pair recombination.
Topotactic Oxidation Process from Magnetite to Maghemite Studied by Rietveld Analysis and 119Sn Mössbauer Spectroscopy
Authors: Yamada Koji , Tobashi Shuji , Ichiba Sumio 
Published: May 2006

Abstract
The topotactic oxidation process from magnetite to maghemite was investigated, using tin substituted magnetite by means of the Rietveld analysis of the powder X-ray diffraction and the 119Sn Mössbauer spectroscopy.
Optical Properties of Tetrakis(p-n-decyloxyphenyl)porphyrin and the Corresponding Metal Complexes by Casting Method
Authors: Kugimiya Shin-ichi , Takemura Motoko 
Published: May 2006

Abstract
Optical properties of terakis(p-n-decyloxyphenyl)porphyirn and its metal complexes (CoII, ZnII, CuII, and MnIIICl) have been investigated in the casting film (stacking state). Type of stacking of the titled porphyrins in the film has been controlled by changing the number of the porphyrin molecules used for the film preparation.
Synthesis of Chiral 1,3-Diols from the Reaction of Yb Metal Umpoled Diaryl Ketones with Chiral Epoxides
Authors: Takaki Ken , Tanaka Shinji , Beppu Fumikazu , Tsubaki Yuichiro , Fujiwara Yuzo 
Published: May 2006

Abstract
The reaction of diaryl ketones such as benzophenone with chiral epoxides in the presence of Yb metal at room temperature has been found to give chiral 1,3-diols in high optical yields.
8-Chloro-8-cyano-1,2-homoheptafulvene and Its Tricarbonyliron Complexes
Authors: Morita Noboru , Ito Shunji , Asao Toyonobu , Kabuto Chizuko , Sotokawa Hideo , Hatano Masahiro , Tajiri Akio 
Published: May 2006

Abstract
8-Chloro-8-cyano-1,2-homoheptafulvene and its tricarbonyliron complexes have been prepared. Their structures and optical activities were investigated.
Diastereoselective Conjugate Addition of Cyclic Hydrazine to Optically Active Vinyl Sulfoxide. A Novel Synthesis of Optically Active Azalactams
Authors: Matsuyama Haruo , Itoh Nobuhiro , Kamigata Nobumasa 
Published: May 2006

Abstract
Optically active (R)-(+)-l,5-diaza-4-phenylbicyclo[4.3.0]nonan-2-one (5) was prepared in high optical purity by diastereoselective conjugate addition of piperidazine to optically active (E)-(S)-1-(methoxycarbonyl)-2-phenylviny p-tolyl sulfoxide, followed by successive reduction of p-tolylsulfinyl group. Nine-membered azalactam was obtained by reductive cleavage of N–N bond of 5.
Magnetic Phase Transition in a Low-Dimensional Organic Antiferromagnet, 1,3-Bisdiphenylene-2-p-chlorophenyl Allyl, under High Pressure. Observation of a High Néel Temperature of 5.03 K
Authors: Yamauchi Jun , Takeda Kazuyoshi , Inoue Mitsuru 
Published: May 2006

Abstract
Hydrostatic pressure dependence of the magnetic phase transition temperature in the organic free radical, 1,3-bisdiphenylene-2-p-chlorophenyl allyl, a one-dimensional Heisenberg antiferromagnet, was investigated from the heat capacity measurements in the pressure range of up to 6 kbar at the liquid helium temperature region. A high Néel temperature of 5.03 K was observed at 5.4 kbar.
Very Strong Long Range Attractive Forces between Stable Hydrophobic Monolayers of a Polymerized Ammonium Surfactant
Authors: Kurihara Kazue , Kato Shinji , Kunitake Toyoki 
Published: May 2006

Abstract
Direct measurements of forces between stable hydrophobic monolayers are performed, revealing very long-range attraction which extends to a separation of 300 nm in pure water. The attraction decreases in the presence of NaBr, while the pull-off force changes only moderately.
Estimation of Hydrogen Mobility in Coal Using a Tritium Tracer Method. Hydrogen Exchange Reaction of Coal with Tritiated Water
Authors: Kabe Toshiaki , Takaoka Hisao , Ishihara Atsushi , Daita Yasushi 
Published: May 2006

Abstract
The reaction of coal with tritiated water was investigated under the coal liquefaction conditions to estimate the mobility of hydrogen in coals. In the reaction of Wandoan coal with tritiated water, the hydrogen exchange ratio of coal increased with a rise in temperature and was 30% at 300 °C and 36% at 400 °C, respectively. The results suggested that the hydrogens attached to aromatic carbons in coal was able to exchange with water even at 300 °C.
A Rapid and Efficient Synthesis of a Trisaccharide Sequence Related to the Core Structure of the Asparagine-linked Type Glycoproteins by Using a Chitobiose Derivative as a Key Starting Material
Authors: Nishimura Shin-Ichiro , Kurita Keisuke , Kuzuhara Hiroyoshi 
Published: May 2006

Abstract
Allyl 2-acetamido-3-O-benzyl-4-O-(2-acetamido-3-O-benzyl-4,6-O-benzylidene-2-deoxy-β-D-glucopyranosyl)-2-deoxy-β-D-glucopyranoside (5) was efficiently prepared from chitobiose octaacetate in high yield. Coupling of 5 with 2,3,4-tri-O-benzyl-α-L-fucopyranosyl bromide by the halide ion-catalyzed glycosidation reaction afforded the protected trisaccharide intermediate in 58% yield. Deallylation followed by catalytic hydrogenolysis gave 2-acetamido-4-O-(2-acetamido-2-deoxy-β-D-glucopyranosyl)-2-deoxy-6-O-(α-L-fucopyranosyl)-D-glucopyranose.
Submicrosecond Time-Resolved ESR Study on Photodissociation of 2,2′-Azobis[isobutyronitrile]
Authors: Takemura Toru , Ohara Keishi , Murai Hisao , Kuwata Keiji 
Published: May 2006

Abstract
A transient signal of the 2-cyano-2-propyl radical was detected in the laser photolysis of the toluene solution of 2,2′-azobis[isobutyronitrile]. The esr spectrum was of an absorption-emission pattern which is characteristic of CIDEP generated in a geminate radical-pair. A dissociation mechanism was deduced on the basis of experimental results.
Novel Three-dimensional Metal-complex Host Structures of catena-[Propylenediaminecadmium(II) Tetra-μ-cyanonickelate(II)] and catena-[Propylenediaminecadmium(II) Tetra-μ-cyanocadmate(II)]
Authors: Park Ki-Min , Hashimoto Masato , Kitazawa Takafumi , Iwamoto Toschitake 
Published: May 2006

Abstract
Two novel metal-complex host structures, consisting of the three-dimensional linkages between square-planar tetracyanonickelate(II) or tetrahedral tetracyanocadmate(II) and propylenediamine-chelated octahedral cadmium(II), have been demonstrated for the 1,2-dichloroethane inclusion compounds.
Allyl Group Transfer between M(II) and M(O) Centers (M = Pd, Pt) Proceeding through Anti Nucleophilic Attack at η3-Allyl Ligand
Authors: Kurosawa Hideo , Ogoshi Sensuke , Chatani Naoto , Kawasaki Yoshikane , Murai Shinji , Ikeda Isao 
Published: May 2006

Abstract
Reactions of [Pd(η3-allyl)(PPh3)2]+ (allyl = CH2CHCH2, CH2CMeCH2, (1c)) with Pt(C2H4)(PPh3)2 in CDCl3 readily afforded the corresponding η3-allylplatinum(II) cations in high yields. Cis–trans isomerization of 1c or its platinum analogue was catalyzed by Pd(0) or Pt(0) complexes via anti attack of M(0) species at the allyl ligand.
Micro-Pore Formation in a Monolayer Adsorbed onto a Solid Substrate with the Subsphase-Lowering Technique
Authors: Iriyama Keiji , Araki Toshinari 
Published: May 2006

Abstract
Micro-pore formation in a monolayer of stearic acid on a glass plate was able to be visualized on the electron microscopic scale. We assumed the origin of numerous micro-pores in a film structure. Finally, we were able to prepare a monolayer of stearic acid without any micro-pore.
A New and Convenient Process for Separation of Carbon Monoxide
Authors: Sonoda Noboru , Mtyoshi Noritaka , Tsunoi Shinji , Ogawa Akiya , Kambe Nobuaki 
Published: May 2006

Abstract
A new method for the efficient separation of carbon monoxide from a binary mixture of carbon monoxide and hydrogen has been established by use of a selenium/secondary amine reaction system. This system consists of the selective uptake of carbon monoxide by the reaction with selenium and secondary amines to form the corresponding ammonium carbamoselenoates (1) in solution and the release of carbon monoxide by thermolysis of 1 into starting components. The amount of separated carbon monoxide was stoichiometric and the purity was higher than 99.9%.
A New Steric Substituent Parameter Ωs. Sophistication of Calculation and Correlation with the Kinetic Data of Several Reactions
Authors: Komatsuzaki Tamiki , Sakakibara Kazuhisa , Hirota Minoru 
Published: May 2006

Abstract
The new steric substituent constant Ωs was applied to correlate kinetic data with the steric hindrance caused by the substituent. Kinetic data were correlated better with Ωs than Es.
A Novel Cu(II) Carrier with High Efficiency and Selectivity for Proton-driven Uphill Transport through Liquid Membranes
Authors: Hiratani Kazuhisa , Hirose Takuji , Fujiwara Kyoko , Saito Kiyoshi 
Published: May 2006

Abstract
N-(8-Quinolyl)-N′-(2-pyridylmethyl)malonamide derivative, which has been synthesized as carrier for transition metal ions, can transport Cu(II) with high selectivity against its concentration gradient through liquid membranes.
A Novel Type of Dimerization of a U-Shaped Unsymmetrical Disulfide Having a Pair of Acylurea Linkages in Solution
Authors: Nakagawa Naoya , Nikki Kunio , Ito Masato M , Kato Jun-ichi , Ota Hisanori , Ogino Masahiko , Miyoshi Ayumu , Endo Tadashi 
Published: May 2006

Abstract
From NMR studies on an unsymmetrical disulfide having a pair of acylurea linkages, the disulfide (monomer) was suggested (i) to adopt a U-shaped conformation, based on the nonequivalence of the methylene protons and on NOE experimental data and (ii) to form dimers in solution.
Crystal Structure of Cycloinulohexaose
Authors: Sawada Masami , Tanaka Takanori , Takai Yoshio , Hanafusa Terukiyo , Hirotsu Ken , Higuchi Taiichi , Kawamura Mishio , Uchiyama Takao 
Published: May 2006

Abstract
X-Ray crystallography analyzed cycloinulohexaose, C36H60O30, whose 18-crown-6 skeleton was the GTGTGT conformational arrangement of the six sequential –O–C–CH2–O– units.
Synthesis, Structure, and Electrical Properties of Ag1.2(2,5-dimethylthio-N,N′-dicyanoquinonediimine)
Authors: Mori Takehiko , Inokuchi Hiroo 
Published: May 2006

Abstract
Several new DCNQI’s (N,N′-dicyanoquinonediirnines) with methylthio groups are synthesized. One of their silver salts, the title compound, is metal down to 188 K. In this salt, a part of the Ag atoms are coordinated by the S and the inner N atoms.
The Structure of a Planar NiN2S2 Complex of the Tetraanionic Form of the Ligand N,N′-Ethylenebis(o-mercaptobenzamide)
Authors: Dutton Jennifer C , Fallon Gary D , Murray Keith S 
Published: May 2006

Abstract
The X-ray crystal structure of a planar [NiIIN2S2]2− complex containing the tetraanionic form of the ligand N,N′-ethylenebis(o-mercaptobenzamide) is described. Comments are made in relation to a recent paper by Yamamura et al.,3 in which a binuclear [NiIIS2O2]2 derivative of the dianionic form of the ligand is described and to the earlier paper of Krüger and Holm5 who first described the present complex.
Characterization of Ruthenium(II) Molecular Hydrogen Complex with (R,R)-4,5-Bis(diphenylphosphinomethyl)-2,2-dimethyl-1,3-dioxolane (diop)
Authors: Saburi Masahiko , Aoyagi Ko , Takeuchi Hiroshi , Takahashi Tamotsu , Uchida Yasuzo 
Published: May 2006

Abstract
The Ru(II) molecular hydrogen complex [RuH(η2-H2)(diop)2]+ was prepared in situ from [RuH(diop)2]+ and H2 gas. The low temperature (213–243 K) 1H and 31P NMR data of this η2-H2 complex indicated the coexistence of two isomers (trans and cis) at equilibrium in solution. At 303 K the coalescence of Ru-H and Ru-(η2-H2) resonances due to their rapid exchanges was observed.