bluuebunny/crossref_metadata_2025 huggingface dataset:
A noise model for InSAR time series
Authors: Agram P. S. , Simons M.
Published: March 2015

Interferometric synthetic aperture radar (InSAR) time series methods estimate the spatiotemporal evolution of surface deformation by incorporating information from multiple SAR interferograms. While various models have been developed to describe the interferometric phase and correlation statistics in individual interferograms, efforts to model the generalized covariance matrix that is directly applicable to joint analysis of networks of interferograms have been limited in scope. In this work, we build on existing decorrelation and atmospheric phase screen models and develop a covariance model for interferometric phase noise over space and time. We present arguments to show that the exploitation of the full 3‐D covariance structure within conventional time series inversion techniques is computationally challenging. However, the presented covariance model can aid in designing new inversion techniques that can at least mitigate the impact of spatial correlated nature of InSAR observations.
Effect of halite coatings on thermal infrared spectra
Authors: Berger Jeff A. , King Penelope L. , Green Andy , Craig Michael A. , Spilde Michael N. , Wright Shawn P. , Kunkel Tara S. , Lee Rachel J.
Published: March 2015

Characterizing the occurrence and distribution of soluble salts on planetary surfaces allows us to model or monitor aqueous and geochemical conditions. Thermal infrared (TIR) remote sensing is useful for identifying some types of salt deposits; however, mineral abundance determinations are based on the interaction of infrared with only the top few hundred micrometers of the surface. Thus, distinguishing massive deposits from coatings presents a challenge to TIR remote sensing. To better understand the TIR properties of spectrally transmissive halite coatings, we investigated the effects of coating thickness and texture on the TIR reflectance spectra of halite‐coated glasses. We analyzed two coating textures with variable thickness: (1) continuous and (2) discontinuous particulate coatings. As halite coating thickness increases, the intensity of substrate absorption bands decreases nonlinearly. The substrate is not detected with halite coatings >150 µm thick. Therefore, when coatings are present, it is not possible to apply TIR models of mineral abundances using linear deconvolution algorithms. We show that continuous and coarse particulate halite coatings increase the reflectance minimum (emissivity maximum), making them potentially detectable on planetary surfaces by the methods of Osterloo et al. (2008). However, the reflectance minimum does not change if coatings have low areal coverage (<50%) or are composed of fine particles (<5 µm). Thus, halite that forms as efflorescent coatings or has been redistributed as fine dust is not detected using TIR spectroscopy. Our results explain why Cl salts are not detected with TIR spectroscopy at many locations on Mars despite high Cl contents.
Nanoscale imaging of pore‐scale fluid‐fluid‐solid contacts in sandstone
Authors: Schmatz Joyce , Urai Janos L. , Berg Steffen , Ott Holger
Published: March 2015

Direct observations of oil‐water‐rock contacts are key for improving our understanding of multiphase flow phenomena in mixed‐wet reservoir rocks. In this study we imaged pore‐scale fluid‐fluid‐solid contacts in sandstone with nanometer resolution using cryogenic broad ion‐beam polishing in combination with scanning electron microscopy and phase identification by energy‐dispersive X‐ray analysis. We observed, as expected, the nonwetting oil phase separated from quartz surfaces by a thin brine film, but also direct contacts between oil and rock at asperities and clay aggregates, which act as pinning points and cause discontinuous motion of the oil‐water‐solid contact line. For the rare classical configuration of a three‐phase contact the microscopic contact angle has been determined by serial sectioning. Our results call for improvements in models of multiphase pore‐scale flow in digital rocks.
The dayside reconnection voltage applied to Saturn's magnetosphere
Authors: Masters A.
Published: March 2015

The ability of magnetic reconnection between interplanetary and planetary magnetic fields to drive a planetary magnetosphere can be quantified as the resulting voltage applied to the system. We present analytical model predictions of the dayside reconnection voltage at Saturn, a planet where solar wind driving has been the subject of debate. Model‐predicted voltages are in reasonable agreement with adapted terrestrial coupling function estimates, as well as voltages inferred from auroral observations. The voltage is most sensitive to the interplanetary magnetic field (IMF). Combining the model with Cassini IMF observations suggests that the voltage is rarely high enough to compete with internal driving of Saturn's outer magnetosphere. The long‐term average dayside (and nightside) voltage is ~40 kV. We point out that the distribution of IMF strength at Saturn is not bimodal, despite the compression‐rarefaction structure of the local heliosphere when the Cassini observations were made.
Seasonal variability in global eddy diffusion and the effect on neutral density
Authors: Pilinski M. D. , Crowley G.
Published: March 2015

We describe a method for making single‐satellite estimates of the seasonal variability in global‐average eddy diffusion coefficients. Eddy diffusion values as a function of time were estimated from residuals of neutral density measurements made by the Challenging Minisatellite Payload (CHAMP) and simulations made using the thermosphere‐ionosphere‐mesosphere electrodynamics global circulation model (TIME‐GCM). The eddy diffusion coefficient results are quantitatively consistent with previous estimates based on satellite drag observations and are qualitatively consistent with other measurement methods such as sodium lidar observations and eddy diffusivity models. Eddy diffusion coefficient values estimated between January 2004 and January 2008 were then used to generate new TIME‐GCM results. Based on these results, the root‐mean‐square sum for the TIME‐GCM model is reduced by an average of 5% when compared to density data from a variety of satellites, indicating that the fidelity of global density modeling can be improved by using data from a single satellite like CHAMP. This approach also demonstrates that eddy diffusion could be estimated in near real‐time from satellite observations and used to drive a global circulation model like TIME‐GCM. Although the use of global values improves modeled neutral densities, there are limitations to this method, which are discussed, including that the latitude dependence of the seasonal neutral‐density signal is not completely captured by a global variation of eddy diffusion coefficients. This demonstrates the need for a latitude‐dependent specification of eddy diffusion which is also consistent with diffusion observations made by other techniques.
Corynebacterium
Authors: Bernard Kathryn A. , Funke Guido
Published: March 2015

Co.ry.ne.bac.te'ri.um. Gr. n.corynea club; L. neut. n.bacteriuma rod, and in biology a bacterium (so called because the first ones observed were rod‐shaped); N.L. neut. n.Corynebacteriuma club bacterium.

Actinobacteria / Actinobacteria / Corynebacteriales / Corynebacteriaceae / Corynebacterium

Straight to slightly curved rods with tapered ends. Rods are usually short or of medium length. Club‐shaped forms may be observed; sometimes ellipsoidal, ovoid or rarely, “whip handles” (see below,Corynebacterium matruchotii) or thinner rods with bulges (see below,Corynebacterium sundsvallense) observed.Snapping division produces angular and palisade arrangements of cells. Gram‐stain‐positive; some cells stain unevenly. Metachromatic (synonym being polyphosphate) granules may be observed for some species. Not‐acid‐fast (Ziehl–Neelsen stain), and no species has aerial mycelium. Nonsporeforming.All species are nonmotile.All species are catalase positive. All species are oxidase negative except forCorynebacterium bovis, Corynebacterium aurimucosum, Corynebacterium doosanense, andCorynebacterium maris(below).Many species are facultatively anaerobic and some are aerobic. Chemoorganotrophs. Some species are lipophilic. Many species produce acid from glucose and some other sugars in peptone media. Several species alkalinize citrate as sole carbon sources, but most do not.

DNA G+C content (mol%): 46–74.

Type species:Corynebacterium diphtheriae(Kruse 1886) Lehmann and Neumann 1896, 350 (“Bacillus diphtheria” KruseinFlügge 1886, 225).
Bacillus
Authors: Logan Niall A. , Vos Paul De
Published: March 2015

Ba.cil'lus. N.L. masc. n.Bacillusa rodlet.

Firmicutes / “Bacilli” / Bacillales / Bacillaceae / Bacillus

Cells rod‐shaped, straight or slightly curved, occurring singly and in pairs, some in chains, and occasionally as long filaments. Endospores are formed, no more than one to a cell; these spores are very resistant to many adverse conditions. Gram‐positive, or Gram‐positive only in early stages of growth, or Gram‐negative. Ameso‐DAP direct murein cross‐linkage type is commonest, butL‐Lys‐D‐Glu, Orn‐D‐Glu andL‐Orn‐D‐Asp have occasionally been reported. Motile by means of peritrichous or degenerately peritrichous flagella, or nonmotile. Aerobes or facultative anaerobes, but a few species are described as strictly anaerobic. The terminal electron acceptor is oxygen, replaceable by alternatives in some species. Most species will grow on routine media such as nutrient agar and blood agar. Colony morphology and size very variable between and within species. A wide diversity of physiological abilities is exhibited, ranging from psychrophilic to thermophilic, and acidophilic to alkaliphilic; some strains are salt tolerant and some are halophilic. Catalase is produced by most species. Oxidase‐positive or ‐negative. Chemo‐organotrophic; two species are facultative chemolithotrophs: prototrophs to auxotrophs requiring several growth factors. Mostly isolated from soil, or from environments that may have been contaminated directly or indirectly by soil, but also found in water, food and clinical specimens. The resistance of the spores to heat, radiation, disinfectants, and desiccation results in species being troublesome contaminants in operating rooms, on surgical dressings, in pharmaceutical products and in foods. Most species have little or no pathogenic potential and are rarely associated with disease in humans or other animals; an exception isBacillus anthracis, the agent of anthrax; several other species may cause food poisoning and opportunistic infections, and strains ofBacillus thuringiensisare pathogenic to invertebrates.

DNA G+C content (mol%): 32–66 (Tm).

Type species:Bacillus subtilisCohn 1872, 174AL.
Burkholderia
Authors: Palleroni Norberto J.
Published: March 2015

Burk.hol.de' ri.a
. M.L. fem. n.
Burkholderia
named after W.H. Burkholder, American bacteriologist who discovered the etiological agent of onion rot.

Proteobacteria / Betaproteobacteria / Burkholderiales / Burkholderiaceae / Burkholderia

Cells single or in pairs,
straight or curved rods
, but not helical. Dimensions, generally 0.5–1 × 1.5–4 µm. Motile by means of one or, more commonly,
several polar flagella
. One species (
Burkholderia mallei
) lacks flagella and is nonmotile. Do not produce sheaths or prosthecae. No resting stages are known.
Gram negative.
Most species
accumulate poly‐β‐hydroxybutyrate (PHB) as carbon reserve material
. Chemoorganotrophs. Have a strictly
respiratory type of metabolism with oxygen as the terminal electron acceptor
.
Some species can exhibit anaerobic respiration with nitrate.
Strains of some of the species (
B. cepacia
,
B. vietnamiensis
) are able to fix N
2
. Catalase positive. A wide variety of organic compounds can be used as sources of carbon and energy for growth. Although hydroxylated fatty acids are present in the lipids of members of other genera of aerobic pseudomonads, species of
Burkholderia
are

characterized by the presence of hydroxy fatty acids of 14, 16, and 18 carbon atoms (C
14:0 3OH
and C
16:0
, and C
16:0 2OH
, C
16:1
, and C
18:1
)

.

The most characteristic of these acids is the C
16:0 3OH
.

Two different ornithine lipids are present in strains of some of the species. Over one‐half of the species are
pathogenic for plants or animals (including humans)
. The genus belongs to the ribosomal RNA similarity group II, which can be differentiated from other groups of aerobic pseudomonads by rRNA/DNA hybridization experiments or by rDNA sequencing.

The mol% G
+
C of the DNA is
: 59–69.6.

Type species
:
Burkholderia cepacia
(Palleroni and Holmes 1981) Yabuuchi, Kosako, Oyaizu, Yano, Hotta, Hashimoto, Ezaki and Arakawa 1993, 398 (Effective publication: Yabuuchi, Kosako, Oyaizu, Yano, Hotta, Hashimoto, Ezaki and Arakawa 1992, 1271) (
Pseudomonas cepacia
Palleroni and Holmes 1981, 479.)
Corynebacteriales ord. nov.
Authors: Goodfellow Michael , Jones Amanda L.
Published: March 2015

Co.ry.ne.bac.te.ri'a.les. N.L. neut. n.Corynebacteriumtype genus of order; suff. ‐alesending to denote order; N.L. fem. pl. n.CorynebacterialestheCorynebacteriumorder.

Actinobacteria / Actinobacteria / Corynebacteriales
Acid‐Catalyzed Synthesis of α,β‐Disubstituted Conjugated Enones by a Meyer–Schuster‐Type Rearrangement in Allenols
Authors: Alcaide Benito , Almendros Pedro , Cembellín Sara , Martínez del Campo Teresa
Published: March 2015

A novel, direct and simple methodology to gain access to α,β‐disubstituted conjugated enones from α‐allenols in a sustainable metal catalysis context, considering the inexpensiveness and environmentally friendliness of iron(III) species and protons, has been developed.

magnified image
Biofilm‐forming bacteria and quality of life improvement after sinus surgery
Authors: Zhang Zi , Adappa Nithin D. , Chiu Alexander G. , Doghramji Laurel J. , Cohen Noam A. , Palmer James N.
Published: March 2015

Background

It remains unclear how much chronic rhinosinusitis (CRS) patients with bacterial biofilms can benefit from functional endoscopic sinus surgery (FESS). We aimed to evaluate whether biofilm‐forming bacteria was associated with quality of life (QOL) improvement after FESS.

Methods

This retrospective cohort study included adult CRS patients who underwent FESS from 2008 to 2011. Sinus samples were taken to evaluate for biofilm‐formation in vitro using a modified Calgary Biofilm Detection Assay. QOL was measured before FESS, and 1‐month, 3‐month, and 6‐month after FESS using 22‐item Sino‐Nasal Outcome Test (SNOT‐22) scores. Patients’ characteristics and medications were collected. Clinical significant QOL change was defined as a difference of at least 0.5 standard deviation (SD) of baseline SNOT‐22 score in the reference group.

Results

A total of 156 patients had complete data, and 15% had biofilm‐forming bacteria (n = 24). Patients with biofilm‐forming bacteria had significantly worse preoperative SNOT‐22 scores compared to patients without biofilm‐forming bacteria (48 ± 20 vs 38 ± 23, p = 0.048). Both groups had clinically significant QOL improvement after FESS, and the differences in their 1‐month (23 ± 19 vs 17 ± 20) and 3‐month (27 ± 18 vs 18 ± 19) post‐FESS SNOT‐22 scores were not significant. However, patients with biofilm‐forming bacteria demonstrated significantly less QOL improvement than patients without biofilm‐forming bacteria from pre‐FESS to 6‐month post‐FESS visits after adjusting for clinical factors (35 ± 25 vs 14 ± 15; β‐coefficient = 0.71; 95% confidence interval [CI], 0.13 to 1.28; p = 0.016).

Conclusion

CRS patients with biofilm‐forming bacteria demonstrated clinically significant QOL improvement following FESS, but the degree of improvement was decreased overtime and became significantly worse than patients without biofilm‐forming bacteria by 6‐month follow‐up. This QOL worsening was independent of other risk factors for CRS.
High Ethene/Ethane Selectivity in 2,2′‐Bipyridine‐Based Silver(I) Complexes by Removal of Coordinated Solvent
Authors: Cowan Matthew G. , McDanel William M. , Funke Hans H. , Kohno Yuki , Gin Douglas L. , Noble Richard D.
Published: March 2015

Following removal of coordinated CH3CN, the resulting complexes [AgI(2,2′‐bipyridine)][BF4] (1) and [AgI(6,6′‐dimethyl‐2,2′‐bipyridine)][OTf] (2) show ethene/ethane sorption selectivities of 390 and 340, respectively, and corresponding ethene sorption capacities of 2.38 and 2.18 mmol g−1 when tested at an applied gas pressure of 90 kPa and a temperature of (20±1) °C. These ethene/ethane selectivities are 13 times higher than those reported for known solid sorbents for ethene/ethane separation. For 2, ethene sorption reached 90 % of equilibrium capacity within 15 minutes, and this equilibrium capacity was maintained over the three sorption/desorption cycles tested. The rates of ethene sorption were also measured. To our knowledge, these are the first complexes, designed for olefin/paraffin separations, which have open silver(I) sites. The high selectivities arise from these open silver(I) sites and the relatively low molecular surface areas of the complexes.
How a Zigzag Carbon Nanotube Grows
Authors: Yuan Qinghong , Ding Feng
Published: March 2015

Owing to the unique structure of zigzag (ZZ) carbon nanotubes (CNTs), their ring‐by‐ring growth behavior is different from that of chiral or armchair (AC) CNTs, on the rims of which kinks serve as active sites for carbon attachment. Through first‐principle calculations, we found that, because of the high energy barrier of initiating a new carbon ring at the rim of a ZZ CNT, the growth rate of a ZZ CNT is proportional to its diameter and significantly (10–1000 times) slower than that of other CNTs. This study successfully explained the broad experimental observation of the lacking of ZZ CNTs in CNT samples and completed the theory of CNT growth.
Synthesis of Difluoromethyl Thioethers from Difluoromethyl Trimethylsilane and Organothiocyanates Generated In Situ
Authors: Bayarmagnai Bilguun , Matheis Christian , Jouvin Kévin , Goossen Lukas J.
Published: March 2015

A copper‐CF2H complex generated in situ from copper thiocyanate and TMSCF2H smoothly converts organothiocyanates into valuable difluoromethyl thioethers. This reaction step can be combined with several thiocyanation methods to one‐pot protocols, allowing late‐stage difluoromethylthiolations of widely available alkyl halides and arenediazonium salts. This strategy enables the introduction of difluoromethylthio groups—a largely unexplored substituent with highly promising properties—into drug‐like molecules.
Low‐Valent Iron(I) Amido Olefin Complexes as Promotors for Dehydrogenation Reactions
Authors: Lichtenberg Crispin , Viciu Liliana , Adelhardt Mario , Sutter Jörg , Meyer Karsten , de Bruin Bas , Grützmacher Hansjörg
Published: March 2015

FeI compounds including hydrogenases show remarkable properties and reactivities. Several iron(I) complexes have been established in stoichiometric reactions as model compounds for N2 or CO2 activation. The development of well‐defined iron(I) complexes for catalytic transformations remains a challenge. The few examples include cross‐coupling reactions, hydrogenations of terminal olefins, and azide functionalizations. Here the syntheses and properties of bimetallic complexes [MFeI(trop2dae)(solv)] (M=Na, solv=3 thf; M=Li, solv=2 Et2O; trop=5H‐dibenzo[a,d]cyclo‐hepten‐5‐yl, dae=(N‐CH2‐CH2‐N) with a d7 Fe low‐spin valence‐electron configuration are reported. Both compounds promote the dehydrogenation of N,N‐dimethylaminoborane, and the former is a precatalyst for the dehydrogenative alcoholysis of silanes. No indications for heterogeneous catalyses were found. High activities and complete conversions were observed particularly with [NaFeI(trop2dae)(thf)3].
A Rabbit Model of Acanthamoeba Keratitis That Better Reflects the Natural Human Infection
Authors: Feng Xianmin , Zheng Wenyu , Wang Yuehua , Zhao Donghai , Jiang Xiaoming , Lv Shijie
Published: March 2015

Acanthamoeba species are ubiquitous, free‐living protozoa that can invade the cornea and result in Acanthamoeba keratitis (AK), a painful progressive sight‐threatening corneal disease. Disease progression in current animal models is too rapid to mimic AK in humans accurately. This study provides a novel method for establishing AK in rabbits and compared it with the conventional method with regard to pathogenesis and immune response in humans. The New Zealand white rabbits were randomly divided into two experimental groups (Groups A and B). Rabbits in the Group A (n = 14) received intrastromal injections of 1 × 104/100 µL Acanthamoeba healyi trophozoites (conventional AK model). The Group B animals (n = 14) received microinjections of 1 × 104/10 µL A. healyi trophozoites between the corneal epithelium and Bowman's layer, anterior to the corneal stroma (novel AK model). In addition, two rabbits were left untreated as normal controls. AK in the treated rabbits was evaluated clinically, histopathologically, and immunologically for 35 days. AK was successfully established in both the conventional and novel model groups. Compared with the Group A, AK in the Group B displayed an efficient immune response with less severe pathology. Moreover, the self‐limiting but chronic nature of the infection in the Group B was strikingly similar to that of AK in humans. The novel animal model for AK described here more closely simulates the pathogenesis and immune response of Acanthamoeba corneal infection in humans than the animal models currently in use. Anat Rec, 298:1509–1517, 2015. © 2015 Wiley Periodicals, Inc.
Impact of nutritional status on the pharmacokinetics of erlotinib in rats
Authors: Pérez‐Pitarch A. , Nácher A. , Merino V. , Catalán‐Latorre A. , Jiménez‐Torres N.V. , Merino‐Sanjuán M.
Published: March 2015

Malnourishment is a complex condition in which physiopathological changes take place in multiple systems as a result of energy, protein and nutrient deficiency. The purpose of this study was to evaluate, using an experimental animal model, the impact of nutritional status on the pharmacokinetic profile of erlotinib, a reversible, highly selective, human epidermal growth factor receptor (HER1/EGFR) tyrosine kinase inhibitor. Two groups of rats –WN (well‐nourished) and UN (undernourished) – were fed with different diets for 23–26 days. Rats were assigned randomly to one of three erlotinib treatments (n = 42) consisting of a single dose administered intravenously (i.v.), via oral solution or via oral suspension. Blood samples were assayed for erlotinib concentration. A population pharmacokinetic model was developed and pharmacokinetic parameters obtained in UN rats were compared with those in WN rats. Erlotinib clearance suffered a 5% decrease in the mild‐undernutrition status. Moreover, when the drug was administered orally as a suspension, the extent and rate of absorption underwent a 20% increase in UN rats. The results of this study might help to explain, at least in part, the variability of erlotinib treatment and could represent the first step towards establishing new dosage guidelines for the treatment of undernourished cancer patients. Copyright © 2015 John Wiley & Sons, Ltd.
Effect of frailty on short- and mid-term outcomes in vascular surgical patients
Authors: Ambler G K , Brooks D E , Al Zuhir N , Ali A , Gohel M S , Hayes P D , Varty K , Boyle J R , Coughlin P A
Published: March 2015

Background

Frailty is a multidimensional vulnerability resulting from age-associated decline. The impact of frailty on outcomes was assessed in a cohort of vascular surgical patients.

Methods

The study included patients aged over 65 years with length of hospital stay (LOS) greater than 2 days, who were admitted to a tertiary vascular unit over a single calendar year. Demographics, mode of admission, diagnosis, mortality, LOS and discharge destination were recorded, as well as a variety of frailty-specific characteristics. The impact of frailty on LOS, discharge destination, survival and readmission rate was assessed using multivariable regression techniques. The ability of the models to predict these outcomes was also assessed.

Results

In total, 413 patients of median age 77 years were followed for a median of 18 (range 12–24) months. The in-hospital, 3- and 12-month mortality rates were 3·6, 8·5 and 13·8 per cent respectively. Receiver operating characteristic (ROC) curve analysis revealed that frailty-based regression models were excellent predictors of 12-month mortality (area under the ROC curve (AUC) = 0·81), prolonged LOS (AUC = 0·79) and discharge to a care institution (AUC = 0·84). A simple additive frailty score using six key features retained strong predictive power for 12-month mortality (AUC = 0·83), discharge to a care institution (AUC = 0·78) and prolonged LOS (AUC = 0·74). This frailty score was also strongly associated with readmission rates (P < 0·001).

Conclusion

Frailty in vascular surgery patients predicts a multiplicity of poorer outcomes. Optimal management should include identification of at-risk patients and treatment of modifiable risk factors.
Matrix Metalloproteinase Inhibition by Heterotrimeric Triple‐Helical Peptide Transition State Analogues
Authors: Bhowmick Manishabrata , Stawikowska Roma , Tokmina‐Roszyk Dorota , Fields Gregg B.
Published: March 2015

Matrix metalloproteinases (MMPs) have been implicated in numerous pathologies. An overall lack of selectivity has rendered active‐site‐targeted MMP inhibitors problematic. The present study describes MMP inhibitors that function by binding both secondary binding sites (exosites) and the active site. Heterotrimeric triple‐helical peptide transition‐state analogue inhibitors (THPIs) were assembled utilizing click chemistry. Three different heterotrimers were constructed, allowing for the inhibitory phosphinate moiety to be present uniquely in the leading, middle, or trailing strand of the triple helix. All heterotrimeric constructs had sufficient thermally stability to warrant analysis as inhibitors. The heterotrimeric THPIs were effective against MMP‐13 and MT1‐MMP, with Ki values spanning 100–400 nM. Unlike homotrimeric THPIs, the heterotrimeric THPIs offered complete selectivity between MT1‐MMP and MMP‐1. Exosite‐based approaches such as this provide inhibitors with desired MMP selectivities.
Palladium Nanotubes Formed by Lipid Tubule Templating and Their Application in Ethanol Electrocatalysis
Authors: Wang Yinan , Ma Shenghua , Su Yingchun , Han Xiaojun
Published: March 2015

Palladium nanotubes were fabricated by using lipid tubules as templates for the first time in a controlled manner. The positively charged lipid 1,2‐dioleoyl‐3‐trimethylammoniumpropane (DOTAP) was doped into lipid tubules to adsorb PdCl42− on the tubule surfaces for further reduction. The lipid tubule formation was optimized by studying the growing dynamics and ethanol/water ratio. The DOTAP‐doped tubules showed pH stability from 0 to 14, which makes them ideal templates for metal plating. The Pd nanotubes are open‐ended with a tunable wall thickness. They exhibited good electrocatalytic performance in ethanol. Their electrochemically active surface areas were 6.5, 10.6, and 83.2 m2 g−1 for Pd nanotubes with 77, 101, and 150 nm wall thickness, respectively. These Pd nanotubes have great potential in fuel cells. The method demonstrated also opens up a way to synthesize hollow metal nanotubes.
Ruthenium Complexes with Dendritic Ferrocenyl Phosphanes: Synthesis, Characterization, and Application in the Catalytic Redox Isomerization of Allylic Alcohols
Authors: Neumann Paul , Dib Hanna , Sournia‐Saquet Alix , Grell Toni , Handke Marcel , Caminade Anne‐Marie , Hey‐Hawkins Evamarie
Published: March 2015

An efficient system for the catalytic redox isomerization of the allylic alcohol 1‐octen‐3‐ol to 3‐octanone is presented. The homogeneous ruthenium(II) catalyst contains a monodentate phosphane ligand with a ferrocene moiety in the backbone and provides 3‐octanone in quantitative yields. The activity is increased by nearly 90 % with respect to the corresponding triphenyl phosphane ruthenium(II) complex. By grafting the catalyst at the surface of a dendrimer, the catalytic activity is further increased. By introducing different spacers between ferrocene and phosphorus, the influence on the electronic properties of the complexes is shown by evaluating the electrochemical behavior of the compounds.
Push–Pull Buta‐1,2,3‐trienes: Exceptionally Low Rotational Barriers of Cumulenic CC Bonds and Proacetylenic Reactivity
Authors: Gawel Przemyslaw , Wu Yi‐Lin , Finke Aaron D. , Trapp Nils , Zalibera Michal , Boudon Corinne , Gisselbrecht Jean‐Paul , Schweizer W. Bernd , Gescheidt Georg , Diederich François
Published: March 2015

A variety of asymmetrically donor–acceptor‐substituted [3]cumulenes (buta‐1,2,3‐trienes) were synthesized by developed procedures. The activation barriers to rotation ΔG≠ were measured by variable temperature NMR spectroscopy and found to be as low as 11.8 kcal mol−1, in the range of the barriers for rotation around sterically hindered single bonds. The central CC bond of the push–pull‐substituted [3]cumulene moiety is shortened down to 1.22 Å as measured by X‐ray crystallography, leading to a substantial bond length alternation (BLA) of up to 0.17 Å. All the experimental results are supported by DFT calculations. Zwitterionic transition states (TS) of bond rotation confirm the postulated proacetylenic character of donor–acceptor [3]cumulenes. Additional support for the proacetylenic character of these chromophores is provided by their reaction with tetracyanoethene (TCNE) in a cycloaddition‐retroelectrocyclization (CA–RE) cascade characteristic of donor‐polarized acetylenes.
A New Method for Quantitative Marking of Deposited Lithium by Chemical Treatment on Graphite Anodes in Lithium‐Ion Cells
Authors: Krämer Yvonne , Birkenmaier Claudia , Feinauer Julian , Hintennach Andreas , Bender Conrad L. , Meiler Markus , Schmidt Volker , Dinnebier Robert E. , Schleid Thomas
Published: March 2015

A novel approach for the marking of deposited lithium on graphite anodes from large automotive lithium‐ion cells (≥6 Ah) is presented. Graphite anode samples were extracted from two different formats (cylindrical and pouch cells) of pristine and differently aged lithium‐ion cells. The samples present a variety of anodes with various states of lithium deposition (also known as plating). A chemical modification was performed to metallic lithium deposited on the anode surface due to previous plating with isopropanol (IPA). After this procedure an oxygenated species was detected by scanning electron microscopy (SEM), which later was confirmed as Li2CO3 by Fourier transform infrared spectroscopy (FTIR) and X‐ray powder diffraction (XRPD). A valuation of the covered area by Li2CO3 was carried out with an image analysis using energy‐dispersive X‐ray spectroscopy (EDX) and quantitative Rietveld refinement.
ChemInform Abstract: HP‐CsB5O8: Synthesis and Characterization of an Outstanding Borate Exhibiting the Simultaneous Linkage of All Structural Units of Borates.
Authors: Sohr Gerhard , Toebbens Daniel M. , Schmedt auf der Guenne Joern , Huppertz Hubert
Published: March 2015

The new high‐pressure phase of title is synthesized in a Walker‐type multianvil apparatus (6 GPa, 900 °C, 10 min) from a precursor obtained under ambient‐pressure conditions.
ChemInform Abstract: Transparency Through Structural Disorder: A New Concept for Innovative Transparent Ceramics.
Authors: Al Saghir Kholoud , Chenu Sebastien , Veron Emmanuel , Fayon Franck , Suchomel Matthew , Genevois Cecile , Porcher Florence , Matzen Guy , Massiot Dominique , Allix Mathieu
Published: March 2015

Highly transparent polycrystalline glass ceramics of composition Sr1+x/2Al2+xSi2‐xO8 (0 < x ≤ 0.4) are prepared by melt quenching of stoichiometric amounts of SrCO3, Al2O3, SiO2 (Rh/Pt crucible, 1.
ChemInform Abstract: Inducing Ferrimagnetism in Insulating Hollandite Ba1.2Mn8O16.
Authors: Larson Amber M. , Moetakef Pouya , Gaskell Karen , Brown Craig M. , King Graham , Rodriguez Efrain E.
Published: March 2015

Both Ba1.2Mn8O16 (I) and BaxCoyMn8‐yO16 (II) are prepared by reaction of stoichiometric amounts of Mn2O3, Co3O4, and Ba(NO3)2 in a KCl flux (alumina crucible, 1123 k, 72 h).
ChemInform Abstract: Cobalt‐Catalyzed Formal [4 + 2] Cycloaddition of α,α′‐Dichloro‐ortho‐Xylenes with Alkynes.
Authors: Komeyama Kimihiro , Okamoto Yuji , Takaki Ken
Published: March 2015

The Co‐catalyzed reaction of α,α′‐dichloro‐ortho‐xylenes with alkynes leads to 1,4‐dihydronaphthalenes and/or naphthalenes depending on the structure of starting compounds.
ChemInform Abstract: An Annulation Reaction for the Synthesis of Cross‐Conjugated Triene‐Containing Hydroindanes from Acyclic Precursors.
Authors: Cheng Xiayun , Micalizio Glenn C.
Published: March 2015

In efforts directed toward the synthesis of seco‐prezizaane sesquiterpenoids, a stereoselective annulation reaction is developed between 4‐hydroxy‐1,6‐enynes (I) and Tms‐alkynes (II) affording cross‐conjugated triene‐containing hydroindanes.
ChemInform Abstract: Electrophilic Cyclization of Aryldiacetylenes in the Synthesis of Functionalized Enediynes Fused to a Heterocyclic Core.
Authors: Danilkina N. A. , Kulyashova A. E. , Khlebnikov A. F. , Braese S. , Balova I. A.
Published: March 2015

Various diacetylene substrates (syntheses described) bearing heteroatom substituents at the ortho position can be used for the preparation of the target compounds.
ChemInform Abstract: The Trapping of Phenyldiazenes in Cycloaddition Reactions.
Authors: Fehler Stefanie K. , Pratsch Gerald , Heinrich Markus R.
Published: March 2015

Phenyldiazenes, generated in situ from phenylazocarboxylates (I), react readily with furans (II) to afford pyridazinium salts (IV) as a result of an ionic cycloaddition.
ChemInform Abstract: Diethyl Tartrate Linked Chiral Macrocyclic Manganese(III)‐Salen Complex for Enantioselective Epoxidation of Olefins and Oxidative Kinetic Resolution of Racemic Secondary Alcohols.
Authors: Maity Nabin Ch. , Kumar Bera Prasanta , Saravanan S. , Abdi Sayed H. R. , Kureshy Rukhsana I. , Khan Noor‐ul H. , Bajaj Hari C.
Published: March 2015

The catalyst can be recovered and reused up to four times with no loss in performance.
ChemInform Abstract: CH‐Activating Oxidative Hydroxylation of 1‐Tetralones and Related Compounds with High Regio‐ and Stereoselectivity.
Authors: Roiban Gheorghe‐Doru , Agudo Ruben , Ilie Adriana , Lonsdale Richard , Reetz Manfred T.
Published: March 2015

Efficient biocatalytic one‐step access to 4‐hydroxy derivatives of 1‐tetralone is developed.
ChemInform Abstract: Enantioselective Aldol Reactions with Aqueous 2,2‐Dimethoxyacetaldehyde Organocatalyzed by Binam‐Prolinamides under Solvent‐Free Conditions.
Authors: Moles Fernando J.N. , Banon‐Caballero Abraham , Guillena Gabriela , Najera Carmen
Published: March 2015

The enantioselective aldol reactions of aqueous dimethoxyacetaldehyde (II) and ketones give β‐hydroxyketones.
ChemInform Abstract: An Alternative to the Classical α‐Arylation: The Transfer of an Intact 2‐Iodoaryl from ArI(O2CCF3)2.
Authors: Jia Zhiyu , Galvez Erik , Sebastian Rosa Maria , Pleixats Roser , Alvarez‐Larena Angel , Martin Eddy , Vallribera Adelina , Shafir Alexandr
Published: March 2015

The reaction of activated ketones such as (I), (IV), and (VI) with phenylbis(trifluoroacetoxy)iodane (II) leads to the corresponding α‐(2‐iodoaryl)ketones.
ChemInform Abstract: Decarboxylative Allylations of Ester Enolate Equivalents.
Authors: Ariyarathna Yamuna , Tunge Jon A.
Published: March 2015

The palladium‐catalyzed decarboxylative allylation of esters (I) leading to desired products (II) is reported.
ChemInform Abstract: Expedient Carbonylation of Aryl Halides in Aqueous or Neat Condition.
Authors: Ang Wei Jie , Lo Lee‐Chiang , Lam Yulin
Published: March 2015

A microwave‐assisted method for the carbonylation of aryl halides with boronic acid, alcohols, or amines is developed.
ChemInform Abstract: Metal‐Free Mizoroki—Heck Type Reaction: A Radical Oxidative Coupling Reaction of 2‐Chloro‐Dithiane with Substituted Olefins.
Authors: Du Wenbin , Lai Junshan , Tian Lixia , Xie Xingang , She Xuegong , Tang Shouchu
Published: March 2015

The reaction of di‐ and trisubstituted alkenes with 2‐chloro‐dithiane (II) affords dithianyl‐substituted alkene derivatives with high regioselectivity.
ChemInform Abstract: A Fast, Efficient and Simple Method for the Synthesis of Cyclic Alkenyl Fluorides by a Fluorinative Carbocyclization Reaction.
Authors: Alonso Pedro , Pardo Pilar , Fananas Francisco J. , Rodriguez Felix
Published: March 2015

A novel method for the synthesis of cyclic alkenyl fluorides is developed using simply tetrafluoroboric acid as the source of fluoride.
ChemInform Abstract: Highly Diastereo‐ and Enantioselective Copper‐Catalyzed Propargylic Alkylation of Acyclic Ketone Enamines for the Construction of Two Vicinal Stereocenters.
Authors: Zhang De‐Yang , Zhu Fu‐Lin , Wang Ya‐Hui , Hu Xin‐Hu , Chen Song , Hou Chuan‐Jin , Hu Xiang‐Ping
Published: March 2015

A highly diastereo‐/enantioselective construction of two vicinal chiral centers via the copper‐catalyzed propargylic alkylation of acyclic ketone enamines with propargylic esters by using a bulky and structurally rigid tridentate ketimine P,N,N‐ligand is developed.
ChemInform Abstract: Preparation of Indium Nitronates and Their Henry Reactions.
Authors: Soengas Raquel G. , Acurcio Rita , Silva Artur M. S.
Published: March 2015

The Henry reaction of aldehydes such as (II) and (VI) with indium nitronates, generated in situ from nitroalkanes (I), affords desired β‐nitroalkanols.
ChemInform Abstract: N‐Arylation of Amines: C—N Coupling of Amines with Arylboronic Acids Using Fe3O4 Magnetic Nanoparticles‐Supported EDTA—Cu(II) Complex in Water.
Authors: Mostafalu Ramin , Kaboudin Babak , Kazemi Foad , Yokomatsu Tsutomu
Published: March 2015

A EDTA—Cu(II) complex supported on Fe3O4 magnetic nanoparticles is applied for the C—N coupling of arylboronic acids with amines.
ChemInform Abstract: ansa‐Ruthenium(II) Complexes of DPEN‐SO2N(Me)(CH2)n (η6‐Aryl) Conjugate Ligands for Asymmetric Transfer Hydrogenation of Aryl Ketones.
Authors: Kisic Andrea , Stephan Michel , Mohar Barbara
Published: March 2015

The asymmetric transfer hydrogenation of alkyl aryl ketones with HCOOH/NEt3 reagent system is investigated in the presence of ansa‐Ru(II) complexes (I) as the catalyst.
ChemInform Abstract: Highly Active Recyclable Heterogeneous Pd/ZnO Nanoparticle Catalyst: Sustainable Developments for the C—O and C—N Bond Cross‐Coupling Reactions of Aryl Halides under Ligand‐Free Conditions.
Authors: Hosseini‐Sarvari Mona , Razmi Zahra
Published: March 2015

Pd nanoparticles on ZnO prepared by co‐precipitation are used as catalyst for the O‐arylation and N‐arylation of phenols and N—H heterocycles.
ChemInform Abstract: A Highly Enantioselective Mannich‐Type Reaction of Glycine Schiff Base Catalyzed by a Cinchoninium Salt.
Authors: Tao Zhonglin , Adele Arafate , Wu Xiang , Gong Liuzhu
Published: March 2015

A chiral phase‐transfer catalyst (ANT) enables the Mannich reaction of a glycine Schiff base with aromatic N‐Boc‐protected imines furnishing α,β‐diaminoacids in excellent yields and with high diastereoselectivity and enantioselectivity.
ChemInform Abstract: WCl6/DMF as a New Reagent System for the Phosphine‐Free Pd(0)‐Catalyzed Aminocarbonylation of Aryl Halides.
Authors: Iranpoor Nasser , Firouzabadi Habib , Rizi Zeinab Tavangar , Erfan Soodabeh
Published: March 2015

Aminocarbonylation of aryl halides (I) with dimethylformamide (II) as the source of the carbonyl group is accomplished under title conditions.
ChemInform Abstract: Catalytic α‐Monoallylation of Aryl Acetonitriles.
Authors: Maji Tapan , Tunge Jon A.
Published: March 2015

The method utilizes an aldehyde to activate nitriles toward α‐allylation and prevent multiple allylations.
ChemInform Abstract: Synthesis of Polysubstituted Benzenes from 2‐Pyrone‐4,6‐dicarboxylic Acid.
Authors: Okura Keisho , Tamura Ryuichi , Shigehara Kiyotaka , Masai Eiji , Nakamura Masaya , Otsuka Yuichiro , Katayama Yoshihiro , Nakao Yoshiaki
Published: March 2015

The thermal decarboxylative cycloaddition of the title compound and its dimethyl ester with vinyl acetates (I) and (IV) or alkynyls (IX) and (XI) follows Diels‐Alder methodology.
ChemInform Abstract: Silver(I)‐Mediated Coupling Reaction of Heterocyclic Ketene Aminals (HKAs) with Bis(phenylsulfonyl)sulfides to Synthesis of Benzenesulfonothioyl‐HKAs.
Authors: Liu Ting‐Ting , Lin Xin‐Rong , Huang Rong , Yang Li‐Fen , Yan Sheng‐Jiao , Lin Jun
Published: March 2015

The products are prepared in view of new anticancer drugs.
ChemInform Abstract: Aminosulfonylation of Arenes, Sulfur Dioxide, and Hydrazines Cocatalyzed by Gold(III) Chloride and Palladium Acetate.
Authors: Ye Shengqing , Wang Huanhuan , Xiao Qing , Ding Qiuping , Wu Jie
Published: March 2015

N‐Amino‐sulfonamides are prepared through gold and palladium catalyzed reaction of arenes, hydrazines and DABCO·bis(sulfur dioxide) as a bench‐stable solid sulfur dioxide equivalent.
ChemInform Abstract: Palladium Catalyzed Cross‐Dehydrogenative‐Coupling of 1,3,5‐Trialkoxybenzenes with Simple Arenes.
Authors: Storr Thomas E. , Namata Faridah , Greaney Michael F.
Published: March 2015

A new method for the cross‐dehydrogenative‐coupling of 1,3,5‐trialkoxy benzenes with simple aromatic hydrocarbons is developed.
ChemInform Abstract: Synthesis and Characterization of New Chiral P,O Ferrocenyl Ligands and Catalytic Application to Asymmetric Suzuki—Miyaura Coupling.
Authors: Bayda Samer , Cassen Audrey , Daran Jean‐Claude , Audin Catherine , Poli Rinaldo , Manoury Eric , Deydier Eric
Published: March 2015

Axial‐chiral binaphthalene is obtained by Suzuki—Miyaura reaction of naphthaleneboronic acid and bromo methylnaphthalene in the presence of newly synthesized chiral P,O ferrocenyl ligands.
ChemInform Abstract: Retro‐Claisen Benzylation: Direct Use of Benzyl Alcohols in Pd‐Catalyzed Couplings with Nitriles.
Authors: Maji Tapan , Ramakumar Kinthada , Tunge Jon A.
Published: March 2015

The retro‐Claisen activation is applicable to primary and secondary benzyl alcohols and hetarylmethyl alcohols.
ChemInform Abstract: Organocatalytic Asymmetric Strategies to Carbocyclic Structures by γ‐Alkylation‐Annulation Sequences.
Authors: Donslund Bjarke S. , Halskov Kim Soeholm , Leth Lars A. , Paz Bruno Matos , Joergensen Karl Anker
Published: March 2015

Vinyl phosphonates (II) and (VIII) as well as nitro olefins (XI) and (XIII) react with annulated cyclic enals (I), (IV), (VI) and (X) to carbocyclic derivatives (III), (V), (VII), (IX), (XII), and (XIV) in a highly regio‐ and enantioselective manner using proline‐based derivatives as chiral catalysts.
ChemInform Abstract: Rhodium(III)‐Catalyzed [3 + 2] Annulation of 5‐Aryl‐2,3‐dihydro‐1H‐pyrroles with Internal Alkynes Through C(sp2)—H/Alkene Functionalization.
Authors: Zhou Ming‐Bo , Pi Rui , Hu Ming , Yang Yuan , Song Ren‐Jie , Xia Yuanzhi , Li Jin‐Heng
Published: March 2015

leading to a variety of spirocyclic indene‐pyrrolidine derivatives
ChemInform Abstract: Concise Stereoselective Synthesis of Oxaspirocycles with 1‐Tosyl‐1,2,3‐triazoles: Application to the Total Syntheses of (.+‐.)‐Tuberostemospiroline and (.+‐.)‐Stemona‐lactam R.
Authors: Fu Junkai , Shen Hongjuan , Chang Yuanyuan , Li Chuangchuang , Gong Jianxian , Yang Zhen
Published: March 2015

The first step in the sequence includes a Rh‐catalyzed loss of nitrogen from the triazole moiety of the starting material.
ChemInform Abstract: Mild and Metal‐Free Oxy‐ and Amino‐Fluorination for the Synthesis of Fluorinated Heterocycles.
Authors: Parmar Dixit , Rueping Magnus
Published: March 2015

The method uses commercially available Selectfluor to trigger an electrophilic oxy‐ and aminofluorination process.
ChemInform Abstract: Facile Preparation of 3,5‐Disubstituted‐4‐aminothiophene‐2‐carbaldehyde from a Novel Unexpected Domino Reaction of Vinyl Azides and 1,4‐Dithiane‐2,5‐diol.
Authors: Chen Binhui , Ni Hangcheng , Guo Xiao , Zhang Guolin , Yu Yongping
Published: March 2015

Title compounds (III) are formed by the reaction of 1,4‐dithiane‐2,5‐diol (II) with vinyl azides of type (I).
ChemInform Abstract: A Simple and Green Approach for the Synthesis of Polyfunctionalized Mono‐ and Bis‐dihydro‐2‐oxopyrroles Catalyzed by Trityl Chloride.
Authors: Sajadikhah Seyed Sajad , Maghsoodlou Malek Taher
Published: March 2015

This simple one‐pot four‐component reaction proceeds under mild and green reaction conditions in the presence of an inexpensive, metal‐free, organic catalyst.
ChemInform Abstract: AgONO‐Assisted Direct C—H Arylation of Heteroarenes with Anilines.
Authors: Gowrisankar Saravanan , Seayad Jayasree
Published: March 2015

The process includes an in situ diazonium reaction with the use of silver nitrite as an unconventional nitrosating agent under acid‐free conditions.
ChemInform Abstract: Enantioselective Intramolecular Hydroamination of Unactivated Alkenes Catalyzed by Mono‐ and Bis(gold) Phosphine Complexes.
Authors: Lee Seong Du , Timmerman Jacob C. , Widenhoefer Ross A.
Published: March 2015

The title process allows the cyclization of unactivated alkenes with carbamates and ureas to form pyrrolidine derivatives with enantioselectivities up to 85%.
ChemInform Abstract: Assembly of a 1H‐Pyrrol‐2(5H)‐one Core Through a Cascade Ugi Reaction/5‐endo‐dig Carbocyclization/Retro‐Claisen Fragmentation Process.
Authors: Peshkov Anatoly A. , Peshkov Vsevolod A. , Li Zhenghua , Pereshivko Olga P. , Van der Eycken Erik V.
Published: March 2015

The simple procedure is carried out with equimolar amounts of substrates and affords a series of highly functionalized pyrrole structures.
ChemInform Abstract: Gold‐Catalyzed Tandem Cycloisomerization/Functionalization of in situ Generated α‐Oxo Gold Carbenes in Water.
Authors: Shen Cang‐Hai , Li Long , Zhang Wei , Liu Shuang , Shu Chao , Xie Yun‐Er , Yu Yong‐Fei , Ye Long‐Wu
Published: March 2015

A simple procedure is elaborated for the gold‐catalyzed synthesis of indole derivatives (III), (V), and (VII) from o‐alkynyl anilines and ynamides.
ChemInform Abstract: A New Entry to Azomethine Ylides from Allylic Amines and Glyoxals: Shifting the Reliance on Amino Ester Precursors.
Authors: Machamer Natalie K. , Liu Xiaoxi , Waters Stephen P.
Published: March 2015

The corresponding azomethine ylides are obtained from amines with glyoxylates or α‐aryl glyoxals, which undergo [3 + 2] cycloadditions to give fused pyrrolidine derivatives.
ChemInform Abstract: In situ‐Generated Iodonium Ylides as Safe Carbene Precursors for the Chemoselective Intramolecular Buchner Reaction.
Authors: Mo Shanyan , Li Xinhao , Xu Jiaxi
Published: March 2015

The ylides are generated from the substrates and Ph‐I(O‐Ac)2 in the presence of KOH and undergo an intramolecular Buchner reaction under catalysis.
ChemInform Abstract: Triflic Acid‐Promoted Cycloisomerization of 2‐Alkynylphenyl Isothiocyanates and Isocyanates: A Novel Synthetic Method for a Variety of Indole Derivatives.
Authors: Saito Takao , Sonoki Yoshihiko , Otani Takashi , Kutsumura Noriki
Published: March 2015

The TfOH‐mediated cycloisomerization of isocyanate (VII) leads to furoindole (VIII), whilst reactions of substrates (I), (III), and (IX) are accompanied by a methyl or methylene migration.
ChemInform Abstract: Synthesis of Cyclic Carbonates from CO2 and Epoxides Catalyzed by Low Loadings of Benzyl Bromide/DMF at Ambient Pressure.
Authors: Wang Lin , Lin Li , Zhang Guangyou , Kodama Koichi , Yasutake Mikio , Hirose Takuji
Published: March 2015

A novel metal‐free protocol for the cycloaddition of epoxides to ambient carbon dioxide affords five‐membered cyclic carbonates.
ChemInform Abstract: Organocatalytic Asymmetric Inverse‐Electron‐Demand 1,3‐Dipolar Cycloaddition of N,N′‐Cyclic Azomethine Imines.
Authors: Zhu Ren‐Yi , Wang Cong‐Shuai , Zheng Jian , Shi Feng , Tu Shu‐Jiang
Published: March 2015

The first organocatalytic asymmetric inverse‐electron‐demand 1,3‐dipolar cycloaddition of the title imines (I) is described.