bluuebunny/crossref_metadata_2025_split huggingface dataset:
Enhanced CO Oxidation on the Oxide/Metal Interface: From Ultra‐High Vacuum to Near‐Atmospheric Pressures
Authors: Pan Qiushi , Weng Xuefei , Chen Mingshu , Giordano Livia , Pacchioni Gianfranco , Noguera Claudine , Goniakowski Jacek , Shaikhutdinov Shamil , Freund Hans‐Joachim 
Published: August 2015

AbstractWe studied CO oxidation on FeO(1 1 1) films on Pt(1 1 1) at submonolayer oxide coverages at ultrahigh vacuum and near‐atmospheric pressure conditions. The FeO(1 1 1) bilayer islands are inert towards CO2 formation. In contrast, the FeO2−x trilayer structure shows substantial CO2 production that reaches a maximum at ≈40 % coverage at both pressure conditions. The results provide compelling evidence that the FeO2−x/Pt(1 1 1) interface is the most active in CO oxidation. Although FeO2−x boundaries possesses weakly bound oxygen species, strong binding of CO to Pt favors the reaction at the FeO2−x/Pt interface as compared to the FeO2−x/FeO one, thus giving a rationale to the reactivity enhancement observed in systems exposing metal/oxide boundaries. In addition, oxygen diffusion from the interior of an FeO2−x island to the active edge sites may be effective for the oxygen replenishment in the CO oxidation catalytic cycle.
Biomolecular DNP‐Supported NMR Spectroscopy using Site‐Directed Spin Labeling
Authors: van der Cruijsen Elwin A. W. , Koers Eline J. , Sauvée Claire , Hulse Raymond E. , Weingarth Markus , Ouari Olivier , Perozo Eduardo , Tordo Paul , Baldus Marc 
Published: August 2015

AbstractDynamic nuclear polarization (DNP) has been shown to greatly enhance spectroscopic sensitivity, creating novel opportunities for NMR studies on complex and large molecular assemblies in life and material sciences. In such applications, however, site‐specificity and spectroscopic resolution become critical factors that are usually difficult to control by current DNP‐based approaches. We have examined in detail the effect of directly attaching mono‐ or biradicals to induce local paramagnetic relaxation effects and, at the same time, to produce sizable DNP enhancements. Using a membrane‐embedded ion channel as an example, we varied the degree of paramagnetic labeling and the location of the DNP probes. Our results show that the creation of local spin clusters can generate sizable DNP enhancements while preserving the intrinsic benefits of paramagnetic relaxation enhancement (PRE)‐based NMR approaches. DNP using chemical labeling may hence provide an attractive route to introduce molecular specificity into DNP studies in life science applications and beyond.
Metal‐Borohydride‐Modified Zr(BH4)4⋅8 NH3: Low‐Temperature Dehydrogenation Yielding Highly Pure Hydrogen
Authors: Huang Jianmei , Ouyang Liuzhang , Gu Qinfen , Yu Xuebin , Zhu Min 
Published: August 2015

AbstractDue to its high hydrogen density (14.8 wt %) and low dehydrogenation peak temperature (130 °C), Zr(BH4)4⋅8 NH3 is considered to be one of the most promising hydrogen‐storage materials. To further decrease its dehydrogenation temperature and suppress its ammonia release, a strategy of introducing LiBH4 and Mg(BH4)2 was applied to this system. Zr(BH4)4⋅8 NH3–4 LiBH4 and Zr(BH4)4⋅8 NH3–2 Mg(BH4)2 composites showed main dehydrogenation peaks centered at 81 and 106 °C as well as high hydrogen purities of 99.3 and 99.8 mol % H2, respectively. Isothermal measurements showed that 6.6 wt % (within 60 min) and 5.5 wt % (within 360 min) of hydrogen were released at 100 °C from Zr(BH4)4⋅8 NH3–4 LiBH4 and Zr(BH4)4⋅8 NH3–2 Mg(BH4)2, respectively. The lower dehydrogenation temperatures and improved hydrogen purities could be attributed to the formation of the diammoniate of diborane for Zr(BH4)4⋅8 NH3–4 LiBH4, and the partial transfer of NH3 groups from Zr(BH4)4⋅8 NH3 to Mg(BH4)2 for Zr(BH4)4⋅8 NH3–2 Mg(BH4)2, which result in balanced numbers of BH4 and NH3 groups and a more active Hδ+⋅⋅⋅−δH interaction. These advanced dehydrogenation properties make these two composites promising candidates as hydrogen‐storage materials.
Photodissociation Dynamics of Cyclopropenylidene, c‐C3H2
Authors: Schuurman Michael S. , Giegerich Jens , Pachner Kai , Lang Daniel , Kiendl Benjamin , MacDonell Ryan J. , Krueger Anke , Fischer Ingo 
Published: August 2015

AbstractIn this joint experimental and theoretical study we characterize the complete dynamical “life cycle” associated with the photoexcitation of the singlet carbene cyclopropenylidene to the lowest lying optically bright excited electronic state: from the initial creation of an excited‐state wavepacket to the ultimate fragmentation of the molecule on the vibrationally hot ground electronic state. Cyclopropenylidene is prepared in this work using an improved synthetic pathway for the preparation of the precursor quadricyclane, thereby greatly simplifying the assignment of the molecular origin of the measured photofragments. The excitation process and subsequent non‐adiabatic dynamics have been previously investigated employing time‐resolved photoelectron spectroscopy and are now complemented with high‐level ab initio trajectory simulations that elucidate the specific vibronic relaxation pathways. Lastly, the fragmentation channels accessed by the molecule following internal conversion are probed using velocity map imaging (VMI) so that the identity of the fragmentation products and their corresponding energy distributions can be definitively assigned.
An Unconventional Approach to Induce Liquid‐Crystalline Phases of Triazine‐Based Dendrons by Breaking Their Self‐Assembly into Dimers
Authors: Lai Long‐Li , Hsieh Jei‐Way , Chang Yung‐Hao , Kuo Ming‐Yu , Cheng Kung‐Lung , Liu Shih‐Hsien , Lee Jey‐Jau , Hsu Hsiu‐Fu 
Published: August 2015

AbstractThree triazine‐based dendrons (1 a–c) were successfully prepared in 70–83 % yields. These newly prepared dendrons are found to be liquid crystalline (LC). Computational investigations on molecular conformations and dipoles of triazine‐based dendrons reveal that the substituent on the central triazine unit interrupts strong dipole or H‐bond interactions to avoid dimeric formation. The obtained dendrons, not favouring self‐assembly into dimers but showing LC behaviours, provides evidence for an approach contrary to the conventional method of inducing LC behaviours of dendrons by dimer or trimer formation, mostly through H‐bond interactions.
Stereocontrolled Annulations of Indolo[2,3‐a]quinolizidine‐Derived Lactams with a Silylated Nazarov Reagent: Access to Allo and Epiallo Yohimbine‐Type Derivatives
Authors: Arioli Federica , Pérez Maria , Are Celeste , Estarellas Carolina , Luque F. Javier , Bosch Joan , Amat Mercedes 
Published: August 2015

AbstractThe facial selectivity of double Michael addition reactions of the silylated Nazarov reagent 4 to unsaturated indolo[2,3‐a]quinolizidine lactams 3 has been studied. Pentacyclic 3‐H/15‐H trans adducts 5 are generated from Nind‐unsubstituted lactams, but the corresponding cis isomers 6 are formed when the indole nitrogen has a tert‐butyloxycarbonyl (Boc) substituent. This reversal in the facial selectivity of the annulation has been rationalized by means of theoretical calculations, which indicate that the initial nucleophilic attack under stereoelectronic control is hampered by the presence of the bulky Boc group. The synthetic usefulness of the pentacyclic Nazarov‐derived adducts is demonstrated by their conversion into allo and epiallo yohimbine‐type targets.
Remarkable Structural and Electronic Features of the Complex Formed by Trimeric Copper Pyrazolate with Pentaphosphaferrocene
Authors: Filippov Oleg A. , Titov Aleksei A. , Guseva Ekaterina A. , Loginov Dmitry A. , Smol'yakov Alexander F. , Dolgushin Fedor M. , Belkova Natalia V. , Epstein Lina M. , Shubina Elena S. 
Published: August 2015

AbstractAccording to spectroscopic (NMR, IR, UV/Vis) study, the interaction of pentaphosphaferrocene [Cp*Fe(η5‐P5)] with trimeric copper pyrazolate [(Cu{3,5‐(CF3)2Pz})3] yields a new compound that is astonishingly stable in solution. Single‐crystal X‐ray analysis reveals unprecedented structural changes in the interacting molecules and the unique type of coordination [Cp*Fe(μ3‐η5:η2,η2‐P5){Cu(3,5‐(CF3)2Pz)}3]. As a result of the 90° macrocycle folding, the copper atoms are able to behave both as a Lewis acid and as a Lewis base in the interaction with the cyclo‐P5ligand.
Mixed‐Metal Coordination Cages Constructed with Pyridyl‐Functionalized β‐Diketonate Metalloligands: Syntheses, Structures and Host–Guest Properties
Authors: Zhang Ying‐Ying , Zhang Long , Lin Yue‐Jian , Jin Guo‐Xin 
Published: August 2015

AbstractThe design and synthesis of mixed‐metal coordination cages, which can act as hosts to encapsule guest molecules, is a subject of intensive research, and the utilization of metalloligand is an effective method to construct a designed heterometallic architecture. Herein, a series of heterometallic cages with half‐sandwich Rh, Ir and Ru fragments using CuII‐metalloligand as a building block by a stepwise approach is reported. The cavity sizes of the cages could be controlled easily by the lengths of the organic ligands. Because the metalloligands in the oxalate‐based cage are somewhat distorted and concave, there are weak Cu⋅⋅⋅O interactions in the molecules, forming a binuclear copper unit. By increasing the height of the cages using longer ligands, 2,5‐dichloro‐3,6‐dihydroxy‐1,4‐benzoquinone (H2CA), the organometallic boxes display interesting host–guest behavior, which are made large enough to accommodate some large molecules, such as pyrene and [Pt(acac)2]. Interestingly, the heterometallic cage with larger cavity size can transfer into a homometallic hexanuclear prism in the presence of pyrazine.
Lanthanide(II) Complexes Supported by N,O‐Donor Tripodal Ligands: Synthesis, Structure, and Ligand‐Dependent Redox Behavior
Authors: Andrez Julie , Bozoklu Gülay , Nocton Grégory , Pécaut Jacques , Scopelliti Rosario , Dubois Lionel , Mazzanti Marinella 
Published: August 2015

AbstractThe preparation and characterization of a series of complexes of the Yb and Eu cations in the oxidation state II and III with the tetradentate N,O‐donor tripodal ligands (tris(2‐pyridylmethyl)amine (TPA), BPA− (HBPA=bis(2‐pyridylmethyl)(2‐hydroxybenzyl)amine), BPPA− (HBPPA=bis(2‐pyridylmethyl)(3.5‐di‐tert‐butyl‐2‐hydroxybenzyl)amine), and MPA2− (H2MPA=(2‐pyridylmethyl)bis(3.5‐di‐tert‐butyl‐2‐hydroxybenzyl)amine) is reported. The X‐ray crystal structures of the heteroleptic Ln2+ complexes [Ln(TPA)I2] (Ln=Eu, Yb) and [Yb(BPA)I(CH3CN)]2, of the Ln2+ homoleptic [Ln(TPA)2]I2 (Ln=Sm, Eu, Yb) and [Eu(BPA)2] complexes, and of the Ln3+ [Eu(BPPA)2]OTf and [Yb(MPA)2K(dme)2] (dme=dimethoxyethane) complexes have been determined. Cyclic voltammetry studies carried out on the bis‐ligand complexes of Eu3+ and Yb3+ show that the metal center reduction occurs at significantly lower potentials for the BPA− ligand as compared with the TPA ligand. This suggests that the more electron‐rich character of the BPA− ligand results in a higher reducing character of the lanthanide complexes of BPA− compared with those of TPA. The important differences in the stability and reactivity of the investigated complexes are probably due to the observed difference in redox potential. Preliminary reactivity studies show that whereas the bis‐TPA complexes of Eu2+ and Yb2+ do not show any reactivity with heteroallenes, the [Eu(BPA)2] complex reduces CS2 to afford the first example of a lanthanide trithiocarbonate complex.
Self‐Recognition Between Two Almost Identical Macroions During Their Assembly: The Effects of pH and Temperature
Authors: Haso Fadi , Li Dong , Garai Somenath , Pigga Joseph M. , Liu Tianbo 
Published: August 2015

AbstractTwo Keplerate‐type macroions, [MoVI72FeIII30O252‐ (CH3COO)12{Mo2O7(H2O)}2{H2Mo2O8(H2O)}(H2O)91]⋅ca. 150 H2O= {Mo72Fe30} and [{Na(H2O)12}⊂{MoVI72CrIII30O252(CH3COO)19‐ (H2O)94}]⋅ca. 120 H2O={Mo72Cr30}, with identical size and shape but different charge density, can self‐assemble into spherical “blackberry”‐like structures in aqueous solution by means of electrostatic interactions. These two macroanions can self‐recognize each other and self‐assemble into two separate types of homogeneous blackberries in their mixed dilute aqueous solution, in which they carry −7 and −5 net charges, respectively. Either adjusting the solution pH or raising temperature is expected to make the self‐recognition more difficult, by making the charge densities of the two clusters closer, or by decreasing the activation energy barrier for the blackberry formation, respectively. Amazingly, the self‐recognition behavior remains, as confirmed by dynamic and static light scattering, TEM, and energy dispersive spectroscopy techniques. The results prove that the self‐recognition behavior of the macroions due to the long‐range electrostatic interaction is universal and can be achieved when only minimum differences exist between two types of macroanions.
Metal–Organic Frameworks as a Versatile Tool To Study and Model Energy Transfer Processes
Authors: Williams Derek E. , Shustova Natalia B. 
Published: August 2015

AbstractDevelopment of materials with efficient and directional energy transfer (ET) could significantly modify the existing energy and material landscape. Metal–organic frameworks (MOFs) are a unique tool to address the upcoming challenges related to the enhancement of ET efficiency and directional energy transport. To harness MOFs as a versatile platform, mechanistic and structural aspects governing ET efficiency should be elucidated. In this context, we review ET mechanisms and structural motifs based on the recent advances achieved in MOF chemistry and also highlight the possible practical applications that are enabled by these studies.
Reduced Graphene Oxide‐Supported TiO2 Fiber Bundles with Mesostructures as Anode Materials for Lithium‐Ion Batteries
Authors: Zhen Mengmeng , Zhu Xiaohe , Zhang Xiao , Zhou Zhen , Liu Lu 
Published: August 2015

AbstractAlthough the synthesis of mesoporous materials is well established, the preparation of TiO2 fiber bundles with mesostructures, highly crystalline walls, and good thermal stability on the RGO nanosheets remains a challenge. Herein, a low‐cost and environmentally friendly hydrothermal route for the synthesis of RGO nanosheet‐supported anatase TiO2 fiber bundles with dense mesostructures is used. These mesostructured TiO2‐RGO materials are used for investigation of Li‐ion insertion properties, which show a reversible capacity of 235 mA h g−1 at 200 mA g−1 and 150 mA h g−1 at 1000 mA g−1 after 1000 cycles. The higher specific surface area of the new mesostructures and high conductive substrate (RGO nanosheets) result in excellent lithium storage performance, high‐rate performance, and strong cycling stability of the TiO2‐RGO composites.
Competitive Gold‐Promoted Meyer–Schuster and oxy‐Cope Rearrangements of 3‐Acyloxy‐1,5‐enynes: Selective Catalysis for the Synthesis of (+)‐(S)‐γ‐Ionone and (−)‐(2S,6 R)‐cis‐γ‐Irone
Authors: Bugoni Serena , Merlini Valentina , Porta Alessio , Gaillard Sylvain , Zanoni Giuseppe , Nolan Steven P. , Vidari Giovanni 
Published: August 2015

AbstractWe report a simple, highly stereoselective synthesis of (+)‐(S)‐γ‐ionone and (‐)‐(2S,6R)‐cis‐γ‐irone, two characteristic and precious odorants; the latter compound is a constituent of the essential oil obtained from iris rhizomes. Of general interest in this approach are the photoisomerization of an endo trisubstituted cyclohexene double bond to an exo vinyl group and the installation of the enone side chain through a [(NHC)AuI]‐catalyzed Meyer–Schuster‐like rearrangement. This required a careful investigation of the mechanism of the gold‐catalyzed reaction and a judicious selection of reaction conditions. In fact, it was found that the Meyer–Schuster reaction may compete with the oxy‐Cope rearrangement. Gold‐based catalytic systems can promote either reaction selectively. In the present system, the mononuclear gold complex [Au(IPr)Cl], in combination with the silver salt AgSbF6 in 100:1 butan‐2‐one/H2O, proved to efficiently promote the Meyer–Schuster rearrangement of propargylic benzoates, whereas the digold catalyst [{Au(IPr)}2(μ‐OH)][BF4] in anhydrous dichloromethane selectively promoted the oxy‐Cope rearrangement of propargylic alcohols.
Organosulfide‐Catalyzed Diboration of Terminal Alkynes under Light
Authors: Yoshimura Aya , Takamachi Yuki , Han Li‐Biao , Ogawa Akiya 
Published: August 2015

AbstractAn efficient metal‐free diboration of terminal alkynes is reported. In the presence of a catalytic amount of organosulfides under light, the addition of bis(pinacolato)diboron (B2pin2) to terminal alkynes takes place efficiently to produce the corresponding double borylation products in good yields. Mechanistic studies indicate that this metal‐free sulfide‐catalyzed diboration of alkynes likely occurs by generation of a boryl‐centered radical with the aid of light and a sulfide, since such a radical was detected in the reaction mixture by electron spin resonance (ESR) spectroscopy. The present form of catalysis (sulfide/light) is thought to be unprecedented and provides a new means of preparation for organoboranes without heavy metal contamination in the products, which is highly desired in the preparation of drugs and electronic materials.
Base‐Mediated Syntheses of Di‐ and Trisubstituted Imidazoles from Amidine Hydrochlorides and Bromoacetylenes
Authors: Chen Xiao Yun , Englert Ulli , Bolm Carsten 
Published: August 2015

AbstractA new transition metal‐free method for the preparation of substituted imidazoles from easy‐to‐handle amidine hydrochlorides and bromoacetylenes has been developed. The reactions proceed in air and use inexpensive K2CO3 as base. Additions of 2,2′‐bipyridine and water have beneficial effects on the product yields. Various di‐ and trisubstituted imidazoles have been prepared in good yields (up to 88 %).
A Biphasic Mercury‐Ion Sensor: Exploiting Microfluidics to Make Simple Anilines Competitive Ligands
Authors: Petzoldt Martin , Eschenbaum Carsten , Schwaebel S. Thimon , Broedner Kerstin , Lemmer Uli , Hamburger Manuel , Bunz Uwe H. F. 
Published: August 2015

AbstractCombining the molecular wire effect with a biphasic sensing approach (analyte in water, sensor‐dye in 2‐methyltetrahydrofuran) and a microfluidic flow setup leads to the construction of a mercury‐sensitive module. We so instantaneously detect Hg2+ ions in water at a 500 μM concentration. The sensor, conjugated non‐water soluble polymer 1 (XFPF), merely supports dibutylaniline substituents as binding units. Yet, selective and sensitive detection of Hg2+‐ions is achieved in water. The enhancement in sensory response, when comparing the reference compound 2 to that of 1 in a biphasic system in a microfluidic chip is >103. By manipulation of the structure of 1, further powerful sensor systems should be easily achieved.
Highly Dynamic Coordination Behavior of Pn Ligand Complexes towards “Naked” Cu+ Cations
Authors: Fleischmann Martin , Welsch Stefan , Peresypkina Eugenia V. , Virovets Alexander V. , Scheer Manfred 
Published: August 2015

AbstractReactions of Cu+ containing the weakly coordinating anion [Al{OC(CF3)3}4]− with the polyphosphorus complexes [{CpMo(CO)2}2(μ,η2:η2‐P2)] (A), [CpM(CO)2(η3‐P3)] (M=Cr(B1), Mo (B2)), and [Cp*Fe(η5‐P5)] (C) are presented. The X‐ray structures of the products revealed mononuclear (4) and dinuclear (1, 2, 3) CuI complexes, as well as the one‐dimensional coordination polymer (5 a) containing an unprecedented [Cu2(C)3]2+ paddle‐wheel building block. All products are readily soluble in CH2Cl2 and exhibit fast dynamic coordination behavior in solution indicated by variable temperature 31P{1H} NMR spectroscopy.
Spatially Close Azo Dyes with Sub‐Nanosecond Switching Speeds and Exceptional Temporal Resolution
Authors: Garcia‐Amorós Jaume , Cuadrado Alba , Reig Marta , De Waele Vincent , Poizat Olivier , Velasco Dolores 
Published: August 2015

AbstractPhotoswitchable bis‐azo dyes with an outstanding temporal resolution of 1015 times between the thermal relaxation rates of their two constituting photochromes are reported. Remarkably, the close spatial proximity of both azo photochromes in these molecular assemblies translates in an unprecedented 103‐fold acceleration of the thermal isomerization rate of their faster azo unit compared to the one displayed by the isolated counterpart. Indeed, the relaxation time of the fast‐isomerizing platform of the herein reported bis‐azobenzenes is as low as 200 ps under ambient conditions. In the wake of these results, the bis‐azo dyes described herein are invaluable chromophores for the design of multifunctional light‐addressable materials in which simultaneous switching in two very different timescales might be essential.
A New Conformation With an Extraordinarily Long, 3.04 Å Two‐Electron, Six‐Center Bond Observed for the π‐[TCNE]22− Dimer in [NMe4]2[TCNE]2 (TCNE=Tetracyanoethylene)
Authors: Graham Adora G. , Mota Fernando , Shurdha Endrit , Rheingold Arnold L. , Novoa Juan J. , Miller Joel S. 
Published: August 2015

AbstractInvited for the cover of this issue are the groups of Joel S. Miller at the University of Utah and Juan J. Novoa at the University of Barcelona. The image depicts a visualization of the energy difference between the new 2e−/6c and the established 2e−/4c bond for C2 and D2h conformations, respectively, for π‐[TCNE]22−. Read the full text of the article at 10.1002/chem.201501963.
ChemInform Abstract: ′Pd20Sn13′ Revisited: Crystal Structure of Pd6.69Sn4.31.
Authors: Klein Wilhelm , Jin Hanpeng , Hlukhyy Viktor , Faessler Thomas F. 
Published: August 2015

AbstractSingle crystals of Pd6.69Sn4.31 are obtained in attempts to grow ternary alloys in the system K—Pd—Sn (Nb crucible in evacuated silica tubes, 1.
ChemInform Abstract: Si‐Based Clathrates with Partial Substitution by Zn and Ga: K8Zn3.5Si42.5, Rb7.9Zn3.6Si42.4, and Cs8‐xGa8‐ySi38+y.
Authors: Baran Volodymyr , Faessler Thomas F. 
Published: August 2015

AbstractCs8‐xGa8‐ySi38+y (I) is obtained from a stoichiometric reaction of the elements in a CsCl flux, whereas K8Zn3.5Si42.5 (II) and Rb7.9Zn3.6Si42.4 (III) are prepared using a combined KBr or RbCl /Zn flux (alumina crucible sealed in stainless steel ampoule, 1173 K, 1 h; cooling to 923 K with a rate of 0.3 K/min).
ChemInform Abstract: Hydrothermal Studies in the System Hg/Se/Te/O: The First TeIV/SeVI Oxocompounds Hg3SeTe2O10 and Hg3SeTe4O14, and the Mixed‐Valent Hg5Se2O8.
Authors: Weil Matthias , Shirkanlou Mahdi 
Published: August 2015

AbstractSingle crystals of the three title compounds are picked out of a product mixture obtained hydrothermally from aqueous mixtures of HgO (or Hg(NO3)2, HgCl2), TeO2, H2SeO4, HNO3, and KOH in a molar ratio Hg:Te:Se:K = 3:2:1:4 (autoclave, 230 °C, 7 d).
ChemInform Abstract: Tetradecanuclear Iron(III)‐Oxo Nanoclusters Stabilized by Trilacunary Heteropolyanions.
Authors: Kortz Ulrich , et al.  
Published: August 2015

AbstractCompounds (III), (VIII), and (XII) are characterized by single crystal XRD, IR spectroscopy, magnetic susceptibility measurements, and electrochemical measurements.
ChemInform Abstract: Conversion of Saccharides into Formic Acid Using Hydrogen Peroxide and a Recyclable Palladium(II) Catalyst in Aqueous Alkaline Media at Ambient Temperatures.
Authors: Zargari N. , Kim Y. , Jung K. W. 
Published: August 2015

AbstractA variety of mono‐ and disaccharides are efficiently converted into formic acid using a recyclable NHC‐amidate palladium(II) catalyst and stoichiometric amounts of H2O2 and NaOH.
ChemInform Abstract: Vanadium (V) Oxide Mediated Bromolactonization of Alkenoic Acids.
Authors: Campbell McKenzie L. , Rackley Samuel A. , Giambalvo Lauren N. , Whitehead Daniel C. 
Published: August 2015

AbstractBromolactones are prepared by vanadium‐catalyzed bromolactonization of alkenoic acids in acceptable purity without column chromatography.