bluuebunny/crossref_metadata_2025_split huggingface dataset:
Influence of phenolic curative on crosslink density and other related properties of dynamically cured NR/HDPE blends
Authors: Pechurai Worawan , Sahakaro Kannika , Nakason Charoen 
Published: April 2009

AbstractDynamically cured 60/40 NR/HDPE blends with various amounts of phenolic curative were prepared in an internal mixer at 160°C. A simple blend (i.e., the blend without curative) was also prepared using the same materials and blend proportion for comparison purposes. Mechanical, dynamic, and morphological properties; swelling resistance and crosslink density of the blends were investigated. It was found that the thermoplastic vulcanizates (TPVs) gave superior mechanical and dynamic properties than the simple blend. Furthermore, the mechanical properties in terms of elongation at break, modulus and tensile strength and elastic response in dynamic test in terms of storage modulus increased with increased loading amount of the curative. The complex viscosity also increased but the tan δ and tension set decreased with increased loading level of the curative. The crosslink density of the TPVs was estimated based on the elastic shear modulus. It was found that the crosslink density of the blends increased with increased loading levels of the curative while the degree of swelling decreased. This correlated well with the trend of mechanical and dynamic properties. SEM micrographs were used to confirm the level of mechanical and dynamic properties. It was found that the simple blend at a given blend ratio exhibited co‐continuous phase morphology. However, the TPVs showed micron scale of vulcanized rubber domains dispersed in a continuous HDPE matrix. The size of vulcanized rubber domains decreased with increasing amounts of the curative. This led to greater interfacial adhesion between the phase and hence superior mechanical and dynamic properties. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2009
Unwanted personal contact and risky situations in ten disney animated feature films
Authors: Hovdestad Wendy E. , Hubka David , Tonmyr Lil 
Published: April 2009

AbstractThe relationships between child maltreatment and the media have been examined in several recent papers. In the authors' previous work representations of neglect, and physical and emotional (but not sexual) child abuse were found in a content analysis of 45 Disney films released from 1937–2006. (Two additional Disney films, released in 2007, are included in the present analysis.) While conducting the content analysis the authors noted unexpected content in ten films. This paper presents an exploratory analysis of depictions of unwanted personal contact and situations that suggest risk due to unsupervised contact with malevolent or questionable strangers. These depictions are described and analyzed, their potential influences on child audiences are discussed, and implications for new research directions are suggested. Copyright © 2009 John Wiley & Sons, Ltd.
Multiple Mechanisms for Electron Transfer at Metal/Self‐Assembled Monolayer/Room‐Temperature Ionic Liquid Junctions: Dynamical Arrest versus Frictional Control and Non‐Adiabaticity
Authors: Khoshtariya Dimitri E. , Dolidze Tina D. , van Eldik Rudi 
Published: April 2009

AbstractWhen all the mechanisms go marching in: Electrochemical devices consisting of Au electrodes coated by self‐assembled alkanethiol monolayers of variable thickness, a ferrocene/ferrocenium redox probe and [bmim][NTf2] (1‐butyl‐3‐methylimidazolium bis(trifluoromethylsulfonyl)imide) as the solvent (see picture), under variable overvoltage, temperature and pressure conditions, allowed the disclosure of three different electron‐transfer patterns.magnified imageElectrochemical devices consisting of gold electrodes coated by electronically well‐behaved self‐assembled alkanethiol monolayers of variable thickness, a ferrocene/ferrocenium redox probe and a typical room‐temperature ionic liquid (RTIL) [bmim][NTf2] (1‐butyl‐3‐methylimidazolium bis(trifluoromethylsulfonyl)imide) as a unique reaction medium with an exceptionally broad spectrum of relaxational modes (probed under variable temperature and pressure conditions), have been used to vary the intrinsic electron‐transfer (ET) rate constant over eight orders of magnitude (from 0.1 to 3×107 s−1) by further tuning of the overvoltage. A remarkable interplay of ET mechanisms was observed, which was accompanied by the stepwise drop in the reorganisation free energy of the medium from 1.0 to 0.1 eV. The first mechanistic changeover to the dynamically arrested regime, with a locking ultra‐slow relaxation time of approximately 50 μs, occurred at donor–acceptor separations below 20 Å. Another mechanistic changeover to the full solvent friction regime, controlled by a medium relaxation process of approximately 100 ns, emerged for ET distances smaller than 8 Å.
Flame‐retardancy of a Cellulosic Fabric by the Application of Synergistic Effect between Ammonium Bromide and Antimony(III) Oxide
Authors: MOSTASHARI Seyed Morteza , MOAFI Hadi Fallah 
Published: April 2009

AbstractThe synergistic effect between ammonium bromide and antimony(III) oxide as a nondurable finish on the flammability of 100% woven plain cotton fabric (with a density of 144 g/m2, the number of yarns 21 per 10 mm), has been investigated in this study. The laundered totally‐dried, weighed specimens were impregnated with suitable concentration individual aqueous ammonium bromide and/or antimony(III) oxide suspension solutions and some sets were impregnated with appropriate admixed solutions of the both chemicals. A vertical flame spread test was then carried‐out to characterize the flammability of the samples. An acceptable synergistic effect was then experienced by using an admixed bath containing 0.1 molar ammonium bromide and 0.05 unit formal antimony trioxide solutions for impartation of flame‐retardancy to a cotton fabric. The optimum mass of the mixture required to impart flame‐retardancy was about 3.64 g of anhydrous additives per 100 g of fabric. The results obtained are in favor of Wall Effect Theory. Moreover synergistic effect indicating dehydration of the treated substrate by using this combination via thermogravimetry could be deduced.
Synthesis, Crystal Structure and Thermal Behavior of Co(en)3[B4O5(OH)4]Cl·3H2O and [Ni(en)3][B5O6(OH)4]2·2H2O
Authors: ZHENG Lijuan , ZHANG Jianjian , LIU Zhihong 
Published: April 2009

AbstractTwo novel transition‐metal complex templated borates containing crystalline water, Co(en)3[B4O5(OH)4]Cl·3H2O (1) and [Ni(en)3][B5O6(OH)4]2·2H2O (2), have been synthesized hydrothermally and characterized by elemental analysis, single crystal X‐ray diffraction, FT‐IR spectroscopy, and TGA. The crystal structure of compound 1 is characterized mainly by forming a 3D supramolecular network through four kinds of hydrogen bonds, O–H···O, O–H···Cl, N–H···Cl and N–H···O, among all components of Co(en)33+, [B4O5(OH)4]2−, Cl− and H2O. The crystal structure of compound 2 is characterized by forming a 3D supramolecular framework with large channels along axis a through O–H···O hydrogen‐bonding among the [B5O6(OH)4]− anions, in which the templating [Ni(en)3]2+ cations and crystalline water molecules are located.
A Novel Spectrophotometric Method for the Determination of Isoniazid Using Cu(II) as Spectroscopic Probe Ion
Authors: ZHANG Hua , ZHANG Yan , WEI Xianjun , DU Xinzhen , LI Quanmin 
Published: April 2009

Abstract A novel method to determine isoniazid with high sensitivity and good selectivity has been established by using Cu(II) as a spectroscopic probe ion. The experiment indicated that Cu(II) was reduced to Cu(I) by isoniazid at pH 6.0, then the resulting Cu(I) was precipitated with SCN− to form CuSCN that could be stayed upon the surface of water phase in the presence of NaNO3. By determining the residual amount of Cu(II) in the water phase, the indirect determination of isoniazid could be achieved. Good linear relationship between the amount of the reacted Cu(II) and the concentration of isoniazid was observed, with the linear range being 0.050–4.50 µg·mL−1, and the detection limit being 0.048 µg·mL−1. This method has been successfully applied to determining isoniazid among pharmaceutical samples and patient urine samples.
Synthesis, Crystal Structures and Electrochemical Properties of O‐Chloropropyl and O‐Cyanopropyl Resorcinarenes
Authors: HAN Jun , ZHOU Rui , YAN Chaoguo 
Published: April 2009

AbstractTetraaryl and tetraferrocenyl resorcinarenes 1a–1d were fully alkylated with 1‐bromo‐3‐chloropropane or 4‐chlorobutyronitrile in refluxing acetone with potassium carbonate as base to give O‐3‐chloropropyl derivatives 2a–2d and O‐3‐cyanopropyl derivatives 3a–3d. The single crystal analysis shows that alkylresorcinarenes exist in an rccc (all cis) configuration and arylresorcinarenes in an rctt (cis‐trans‐trans) configuration. The electrochemical properties of tetraferrocenyl resorcinarenes were studied by cyclic voltammetry.
Bending‐induced switching of dynein activity in elastase‐treated axonemes of sea urchin sperm—Roles of Ca2+ and ADP
Authors: Hayashi Shuichi , Shingyoji Chikako 
Published: April 2009

AbstractFlagellar beating is caused by microtubule sliding, driven by the activity of dynein, between adjacent two of the nine doublet microtubules. An essential process in the regulation of dynein is to alternate its activity (switching) between the two sides of the central pair microtubules. The switching of dynein activity can be detected, in an in vitro system using elastase‐treated axonemes of sea urchin sperm flagella, as a reversal of the relative direction of ATP‐induced sliding between the two bundles of doublets at high Ca2+ (10−4 M) at pH 7.8–8.0. The reversal is triggered by externally applied bending of the doublet bundle. However, the mechanism of this bending‐induced reversal (or backward sliding) remains unclear. To understand how the switching of dynein activity in flagella can be induced by bending, we studied the roles of ADP, which is an important factor for the dynein motile activity, and of Ca2+ in the bending‐induced reversal of microtubule sliding between two bundles of doublets at pH 7.5 and 7.2. We found that the reversal of sliding direction was induced regardless of the concentrations of Ca2+ at low pH, but occurred more frequently at low Ca2+ (<10−9 M) than at high Ca2+. At pH 7.5, an application of ADP increased the frequency of occurrence of backward sliding at high as well as low concentrations of Ca2+. The results indicate that ADP‐dependent activation of dynein, probably resulting from ADP‐binding to dynein, is involved in the regulation of the bending‐induced switching of dynein activity in flagella. Cell Motil. Cytoskeleton 2009. © 2009 Wiley‐Liss, Inc.
Design of Chiral Hydroxyalkyl‐ and Hydroxyarylazolinium Salts as New Chelating Diaminocarbene Ligand Precursors Devoted to Asymmetric Copper‐Catalyzed Conjugate Addition
Authors: Rix Diane , Labat Stéphane , Toupet Loïc , Crévisy Christophe , Mauduit Marc 
Published: April 2009

AbstractThe design and the synthesis of a set of new chiral hydroxyalkyl‐ and hydroxyaryl‐chelating diaminocarbene ligands is reported. Comparative catalytic studies show the importance of the scaffold design around the NHC unit to obtain a high enantiocontrol in Cu‐catalyzed asymmetric conjugate addition (ACA). Whereas low selectivities are observed when the stereogenic centre is placed within the N‐heterocyclic ring, an interesting match effect can be observed when central chirality is located within both of the two side chains, which enables up to 92 % ee in the catalysis reaction.(© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2009)
Gas‐Phase Model Studies Relevant to the Decomposition of Transition‐Metal Nitrates M(NO3)2 (M = Co, Ni) into Metal–Oxo Species
Authors: Schröder Detlef , de Jong Krijn P. , Roithová Jana 
Published: April 2009

AbstractElectrospray ionization (ESI) of aqueous cobalt(II) and nickel(II) nitrate solutions inter alia affords the solvated, mono‐ and oligonuclear nitrato complexes [Mm(NO3)2m–1(H2O)n]+ (M = Co, Ni; m = 1–5; n = 1–4). The collision‐induced dissociation spectra of the mass‐selected ions imply that these ions correspond to genuine hydrated metal(II) nitrato complexes in that either cluster degradation through expulsion of neutral M(NO3)2 or sequential loss of water ligands take place. In the case of the lowest member of the series (m, n = 1), however, loss of water competes with homolytic cleavage of the N–O bond, which leads to the formation of [M,O2,H2]+ cations containing formal MIII. For m > 1, similar activation of the nitrato ligand was observed under harsher ionization conditions in ESI and provides access to cationic transition‐metal oxide clusters in the gas phase. In addition to the collision experiments, thermal reactions of the solvated nitrato complexes with nitrogen monoxide reveal bond‐activation pathways, which shed some light on the NO‐assisted pyrolysis of solid metal nitrates for the preparation of metal oxide catalysts. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2009)
Arecoline‐induced phosphorylated p53 and p21WAF1 protein expression is dependent on ATM/ATR and phosphatidylinositol‐3‐kinase in clone‐9 cells
Authors: Chou Wen‐Wen , Guh Jinn‐Yuh , Tsai Jung‐Fa , Hwang Chi‐Ching , Chiou Shean‐Jaw , Chuang Lea‐Yea 
Published: April 2009

AbstractBetel‐quid use is associated with liver cancer whereas its constituent arecoline is cytotoxic, genotoxic, and induces p53‐dependent p21WAF1 protein expression in Clone‐9 cells (rat hepatocytes). The ataxia telangiectasia mutated (ATM)/rad3‐related (ATR)‐p53‐p21WAF1 and the phosphatidylinositol‐3‐kinase (PI3K)‐mammalian target of rapamycin (mTOR) pathways are involved in the DNA damage response and the pathogenesis of cancers. Thus, we studied the role of ATM/ATR and PI3K in arecoline‐induced p53 and p21WAF1 protein expression in Clone‐9 cells. We found that arecoline (0.5 mM) activated the ATM/ATR kinase at 30 min. The arecoline‐activated ATM/ATR substrate contained p‐p53Ser15. Moreover, arecoline only increased the levels of the p‐p53Ser6, p‐p53Ser15, and p‐p53Ser392 phosphorylated p53 isoforms among the known isoforms. ATM shRNA attenuated arecoline‐induced p‐p53Ser15 and p21WAF1 at 24 h. Arecoline (0.5 mM) increased phosphorylation levels of p‐AktSer473 and p‐mTORSer2448 at 30–60 min. Dominant‐negative PI3K plasmids attenuated arecoline‐induced p21WAF1, but not p‐p53Ser15, at 24 h. Rapamycin attenuated arecoline‐induced phosphrylated p‐p53Ser15, but not p21WAF1, at 24 h. ATM shRNA, but not dominant‐negative PI3K plasmids, attenuated arecoline‐induced p21WAF1 gene transcription. We conclude that arecoline activates the ATM/ATR‐p53‐p21WAF1 and the PI3K/Akt‐mTOR‐p53 pathways in Clone‐9 cells. Arecoline‐induced phosphorylated p‐p53Ser15 expression is dependent on ATM whereas arecoline‐induced p21WAF1 protein expression is dependent on ATM and PI3K. Moreover, p21WAF1 gene is transcriptionally induced by arecoline‐activated ATM. J. Cell. Biochem. 107: 408–417, 2009. © 2009 Wiley‐Liss, Inc.
Synthesis of 8‐amino‐9‐β‐D‐ribofuranosylpurin‐6‐thione and related 6‐substituted‐8‐aminopurine nucleosides
Authors: Szekeres Gabor L. , Robins Roland K. , Boswell Kay H. , Long Robert A. 
Published: April 2009

AbstractAcetylation of 8‐amino‐9‐β‐D‐ribofuranosylpurin‐6‐one (III), followed by chlorination of the tetraacetyl derivative 8‐acetamido‐9‐(2,3,5‐tri‐O‐aeetyl‐β‐D‐ribofuranosyl)purin‐6‐one (IV) with phosphorus oxychloride yielded 8‐aeetamido‐6‐ehloro‐9‐(2,3,5‐tri‐O‐acetyl‐β‐D‐ribofuranosyl)‐purine (V). The 6‐chloro substitutent of V was readily displaced with thiourea to give, after treatment with sodium methoxide 8‐acetamido‐9‐β‐D‐ribofuranosylpurine‐6‐thione (VIII). Chlorination of 8‐bromo‐9‐(2,3,5‐tri‐O‐acetyl‐β‐D‐ribofuranosyl)purin‐6‐one (IX) yielded 6,8‐dichloro‐9‐(2,3,5‐tri‐O‐acetyl‐β‐D‐ribofuranosyl)purine (X), which underwent nucleophilic displacement with ethanolic ammonia selectively in the 8 position. The resulting 8‐amino‐6‐chloro‐9‐β‐D‐ribofuranosylpurine (VII) was converted to 8‐amino‐9‐β‐D‐ribofuranosylpurine‐6‐thione (I), 8‐amino‐6‐methylthio‐9‐β‐D‐ribofuranosylpurine (II), and to 8‐amino‐6‐hydrazino‐9‐β‐D‐ribofuranosylpurine (XI).
Structure des bases de schiff dérivées de 4‐acylisoxazolin‐5‐ones
Authors: Maquestiau A. , Van Haverbeke Y. , Muller R. N. 
Published: April 2009

AbstractL'analyse spectrale des bases de Schiff dérivées des 4‐acylisoxazolm‐5‐ones établit la prédominance d'une structure chélatée de type énaminone. L'influence de l'effet stérique des sub‐stituants sur la structure des composés est examinée.
1,3‐Dipolar cycloaddition reaction of benzodiazinium and naphthyridinium N‐imines with acetylenic esters
Authors: Tamura Yasumitsu , Miki Yasuyoshi , Ikeda Masazumi 
Published: April 2009

Abstract1,3‐Dipolar cycloaddition of N‐imines derived from mono‐N‐amino salts of phthalazines, 2‐phenylquinoxaline, 1,5‐ and 1,8‐naphthyridines with dimethyl acetylenedicarboxylate: and methyl propiolate resulted in the formation of new tricyclic: heterocyclic ring systems with bridgehead nitrogen.
Reactions of the nitrosonium ion. VII. Syntheses of dihydroisoquinolines and oxazoles from azides in nitrile solvents
Authors: Doyle Michael P. , Spoelhof G. David , Zaleta Mary A. 
Published: April 2009

AbstractN‐Alkylnitrilium salts are cleanly produced from alkyl azides by reaction with nitrosonium salts in nitrile solvents. Syntheses of 3,4‐dihydroisoquinolines from nitrilium ions formed in this method from 2‐phenylethyl azide are described. Oxazoles are readily formed from phenacyl azides by this general method; the advantages of oxazole syntheses through azide nitrosation are discussed.
The behaviour of 2‐nitrothiophene and of 3‐nitrothiophene with some nucleophiles
Authors: Dell'Erba Carlo , Novi Marino , Guanti Giuseppe , Spinelli Domenico 
Published: April 2009

AbstractThe reactivity of 2‐nitrothiophene (1) and of 3‐nitrothiophene (II) with some nucleophiles has been studied. According to calculated electronic densities I can receive nucleophilic attack at C3 and C5 depending on the nucleophile used, but II only at C2. With N‐lithium piperidine both I and II also give coupling products (VII and XI respectively) of the hithienyl type.
Heterocycles from substituted amides, V.. 1,2,3,5‐Oxathiadiazolin‐4‐one 2‐oxides from thionyl chloride and N‐hydroxyureas
Authors: Chupp John P. , Dahm Donald J. , Leschinsky Kindrick L. 
Published: April 2009

AbstractThe reaction of certain N‐hydroxy‐N‐methyl‐N′‐aryl ureas, 2, with thionyl chloride are shown to give a new heterocycle, 1,2,3,5‐oxathiadiazolin‐4‐one 2‐oxides, 3, in a synthesis that appears to have more severe structural requirements than the previously reported ring closures from α‐hydroxyacylanilides and thionyl chloride. Isolable amounts of 3 are obtained only if the aryl group contains deactivating substituents, and the hydroxy group is attached to the N‐alkyl nitrogen; otherwise, resin formation or ring chlorination are found to occur. The assigned structure as 3 was verified by a full three dimensional X‐ray analysis of a representative example, 3a, 3‐(4‐bromophenyl)‐5‐methyl‐1,2,3,5‐oxathiadiazolin‐4‐one.
The direct acylamination of pyridine 1‐oxides. Effect of substituents in N‐phenylarylimidoyl chloride. Trapping with thiols
Authors: Abramovitch R. A. , Tomasik P. 
Published: April 2009

AbstractThe effect of a para‐substituent in the benzoic acid portion of the arylimidoyl chloride on the nature and yield of products in the reaction with pyridine 1‐oxide has been studied. When an electron‐withdrawing substituent is present no acylamination product is formed and only 2‐ and 3‐chloropyridine are isolated. When benzenethiol is added a respectable yield of 3‐phenylthiopyridine is obtained, but alkanethiols gave low yields of 3‐alkylthiopyridines.
Determination de la structure d'halogenotriazoles‐1,2,4 par spectrometrie de masse
Authors: Bernardini Antoine , Viallefont Philippe , Daunis Jacques 
Published: April 2009

AbstractLes spectres de masse de divers halogénotriazoles‐1,2,4 substitués sont décrits; les principales fragmentations sont données et leur utilité à la détermination des structures de composés isomères est montrée.
Naphthyridine chemistry: Ring enlargement to a pyrido[2,3‐b] azepine
Authors: Carboni S. , Da Settimo A. , Bertini D. , Ferrarini P. L. , Livi O. , Tonetti I. 
Published: April 2009

AbstractThe boron trifluoride‐catalyzed rearrangement of the epoxide derived from 3‐benzylidene‐ 7‐methyl‐2,3‐dihydro‐1,8‐naphthyridin‐4‐(1H)one (II) is described. The structure of the obtained 8‐methyl‐4‐phenyl‐1,2,3,4‐tetrahydro‐5H‐pyrido[2,3,‐b]‐azepin‐3, azepin‐3,5‐dione (X) has been elucidated with aid of chemical and spectral evidence.
1,3‐Dipolar cycloaddition reactions of 3‐acylimino‐1‐methylbenzimidazolium betaines
Authors: Tamura Yasumitsu , Hayashi Hironori , Ikeda Masazumi 
Published: April 2009

Abstract3‐Acylimino‐1‐methylbenzimidazolium betaines undergo 1,3‐dipolar cycloaddition reactions with activated alkenes (methyl acrylate, acrylonitrile, and fumaronitrile) and methyl propiolate to produce 2‐substituted 1‐methylbenzimidazoles. The transformation involves the initial formation of a 1,3‐dipolar cycloadduct followed by the NN bond cleavage. The primary adducts can be isolated from the reaction with methyl acrylate and acrylonitrile.
Benzo[b] thiophene derivatives. XXII. Synthesis of the isomeric 5‐methyl‐6‐methoxy‐ and 5‐methoxy‐6‐methylbenzo[b] thiophene‐2‐carboxylic acids
Authors: Campaigne E. , Abe Yasuo 
Published: April 2009

AbstractThe two isomeric benzo[b] thiophene‐2‐carboxylie acids having methyl and methoxy groups at positions 5 and 6 have been prepared and characterized. Both acids have been decarboxylated to the corresponding isomeric 5,6‐disubstituted benzo[b]thophenes, and esterified to their methyl esters. The intermediate rhodanines, α‐mercaptocinnamic acids and corresponding disulfides are described. An unusual by‐product in the oxidative cyclization of β‐3‐methyl‐4‐methoxyphenyl‐α‐mercaptoacrylic acid with iodine is shown to be trans‐3‐methyl‐4‐methoxycinnamic acid, which can also be formed directly from the mercaptoacrylic acid by reduction with hydrogen iodide.
Synthesis in the diazasteroid group. V. Synthesis of the 9,14‐diazasteroid system
Authors: Yamazaki Takao , Matoba Katsuhide , Yajima Masao , Nagata Masanori , Castle Raymond N. 
Published: April 2009

AbstractBy the condensation reaction of 2‐chloroquinoline (X) and ethyl 2‐pyrrolidineacetate (II), 2‐[1′‐(2′‐carboethoxymethyl)pyrrolidyl]quinoline (XI) was prepared. Compound XI was converted to the quarternary base (XIII) having a 9,14‐diazasteroid skeleton by the reduction of the ester to the corresponding alcohol followed by the quaternarization via tosylation. Compound XIII was reduced with sodium borohydride to 9,14‐diazagona‐1,3,5(10)‐triene (III), which is suggested to have the trans‐anti‐trans conformation.
Rearrangement reactions of phenyl chloroformate derivatives of 2‐Hydroxyaminoacetanilides to hydantoins, ureas and hydantoie acid derivatives
Authors: Hell Stanley C. , Conklin George , Mccaully Ronald J. 
Published: April 2009

AbstractAlkaline treatment of 2′‐benzoyl‐2‐(N‐carbophenoxy‐N‐hydroxyamino)‐4′‐chloroacetanilide (10) and its corresponding acetate 6 afforded respectively 5‐(2‐benzoyl‐4‐chlorophenyl)‐3‐hydroxy‐hydantoic acid (12) and 6‐chloro‐4‐phenylquinazolone (13). A study of the course of the reaction was carried out with the corresponding compounds that are devoid of the 2‐benzoyl group. An elucidation of the rearrangement is based on the isolation and independent synthesis of the heterocyclic intermediates.