bluuebunny/crossref_metadata_2025_split huggingface dataset:
The Influence of a Torch Extension on the Detection Power of an Inductively Coupled Argon Plasma Used in Atomic Emission Spectrometry
Authors: Taylor P. D. P. 
Published: September 2010

AbstractThis paper describes the application of an extension to a plasma torch used in ICAP‐AES (Inductively Coupled Argon Plasma‐Atomic Emission Spectrometry). The effect on the background emission spectrum is examined as well as the effect on the detection limits for several spectral lines.
Synthesis of Functionalized 2,3‐dihydro‐ [9bH] Oxazolo [2,3‐a]‐Isoindoline‐5‐Ones
Authors: Kimpe Norbert De , Yao Zipeng , Buyck Laurent De , Verhe Roland , Schamp Niceas 
Published: September 2010

AbstractThe synthesis of 9b‐functionalized 2,3‐dihydro‐[9bH] oxazolo [2, 3‐a] isoindoline‐5‐ones by reaction of 1‐azaallylic carbanions with N‐(2‐bromoethyl) phthalimide is described.
Heterocycles Synthesis Through Reactions of Nucleophiles with Acrylonitriles
Authors: Abdel‐Latif F. F. , Gohar A‐K. M. N. 
Published: September 2010

AbstractA New series of 4‐pyridinyl substituted pyranoazoles and pyridinones were prepared through the reactions of α‐substituted‐B‐(4‐pyridinyl) acrylonitriles with active methylene reagents. The activating effect of the pyridin‐4‐yl substituent on the double bond in acrylonitriles is demonstrated.
The Polarographic Behaviour of 2,4‐Dinitrophenol in Aqueous and non Aqueous Methanolic Media
Authors: Taha Fouad , El Shayeb H. A. , Abd El Gaber A. A. , El Roudi A. M. 
Published: September 2010

Abstract2,4‐Dinitrophenol (DNP) is polarographically reduced in aqueous buffered solutions along two or three diffusion‐controlled waves depending on the pH. The height of the first‐wave is practically independent of pH. Each of the two nitro‐groups is reduced independently to the hydroxylamine stage. Within the pH range 4.6–9.1 the reduction process exhibits only two steps which manifest the presence of bonded and non bonded states, hence the reduction of DNP is stopped with the formation of two different intermediates.DNP in non aqueous methanolic media is reduced along three irreversible waves due to the dissociated and anionic forms of the depolarizer. The addition of proton donors causes the reduction of DNP to form the diamine product when 12 equivalents of acid/equivalent depolarizer are present. In the presence of one mole of alkali, the first wave is completely eliminated.The effect of surfactants on the electroreduction waves of DNP was examined. Additives influence the reduction waves in two distinct ways. The kinetics and mechanism of the reduction process are discussed.
Première Synthèse Totale de L'Alliodorine. Préparation D'Aldéhydes Isopréniques E À Partir des Méthyl‐2 Oxo‐6 Hexène‐2 (E+Z) Carbonitriles‐1
Authors: Tortajada J. , Morizur J‐P. 
Published: September 2010

AbstractThe first synthesis of alliodorine 4EE, a constituent isolated from the duramen of a tropical tree: Cordia alliodora is reported.A mixture of E and Z isomers of 2‐methyl‐6‐oxo‐2‐heptenenitrile 3 easily accessible by U.V. irradiation of 1‐methyl‐2‐oxo‐cyclopentanecarbonitrile 2 is used as starting material. E/Z isomerism is suppressed during a step of the synthesis reduction of the α,β‐unsaturated nitrile function (E+Z) in the α,β‐unsaturated aldehyde E (the Z→E isomerisation occurs during the hydrolysis of the intermediate imine).The synthesis was conducted in six steps with an overall yield of 12,5% from 1‐methyl‐2‐oxocyclopentanecarbonitrile 2.
24(R), 25‐Dihydroxycholesterol; An Attempt for Side‐Chain Stereocontrol Via Iodolactonization
Authors: van Der Eycken J. , van Wabeeke L. , Vandewalle M. 
Published: September 2010

AbstractStereocontrolled formation of the side‐chain of 24(R), 25‐dihydroxycholesterol (1) via an iodolactonization process, involving a C‐10 carboxylic function and a 24, 25 double bond, has been studied. Low stereoselectivity was observed.
Determination of Tellurium in Cast Iron by Instrumental and Radiochemical Neutron Activation Analysis
Authors: Dams R. , Helsen M. 
Published: September 2010

AbstractA procedure for the determination of tellurium in cast iron by neutron activation analysis is developed. In a number of samples the 131 I activity (T1/2=8.04 d) produced can be measured purely instrumentally. When the molybdenum/tellurium ratio exceeds 25, a radiochemical separation is required. The pure 131 I activity can then be measured interference‐free. The tellurium content of 7 NBS‐reference cast irons with concentrations varying from 50 to 750 ppm is measured. The reproducibility is generally better than 6% and the accuracy is good.
Analysis of High‐Purity Indium by Spark Source Mass Spectrometry
Authors: Liu X. D. , Verlinden J. , Adams F. , Adriaenssens E. 
Published: September 2010

AbstractHigh purity indium samples were analysed by spark source mass spectrometry, using electrical and photoplate detection. Cooling of the samples was applied to obtain stable sparking conditions. For the calibration of the differences in elemental sensitivity, standard samples were prepared in which 9 impurities were determined by graphite furnace atomic absorption spectrometry. In this manner accuracies of less than 40% were obtained for selected elements. About 40 elements could be determined with detection limits of 10 to 30 ppb.
A Study on the Mechanisms Involved in Peritoneal Transfer of CR
Authors: Wallaeys B. , Cornelis R. , Sabbioni E. , Belpaire F. , Lameire N. 
Published: September 2010

AbstractPathways were investigated for the Cr transfer from the dialysate into the bloodstream as observed during continuous ambulatory peritoneal dialysis (CAPD). As the presence of Cr(VI) in the dialysate can be ruled out, due to reduction by lactate, a common compound of dialysate, all experiments were aimed at studying the behaviour of Cr(III). The ability of Cr(III) to penetrate across membranes at physiological pH was investigated. The characteristics during ‘in vitro’ dialysis were compared to the behaviour during acute ‘in vivo’ peritoneal dialysis in anesthetized rabbits. It appeared that lactate plays an important role in the mobility and the subsequent peritoneal Cr transfer.
Structural Analysis of Organic Compounds by Laser Microprobe Mass Spectrometry (LAMMA)
Authors: van Vaeck L. , Claereboudt J. , Veldeman E. , Vermeulen M. , Gijbels R. 
Published: September 2010

AbstractThe possibilities of the laser microprobe mass analyser (LAMMA) for the mass spectrometric (MS) characterisation of organic compounds have been explored systematically.Specific methods of procedure are proposed to overcome the drawbacks of the actual instrumentation for organic applications. Energy selective ionisation and transmission can be used to discriminate inorganic clusters from organic ions.In general, the microprobe mass spectra are complex and an approach, allowing to extract and rationalise the structurally relevant information, has been developed. The issued model for interpretation and different aspects of laser microbeam induced desorption and ionisation mechanisms are discussed.A variety of polyfunctional molecules has been investigated. Examples are selected to illustrate the potential and limitations of LAMMA in organic mass spectrometry.
Degradation of the Desoxycholic Acid Side Chain. Double Bond Isomerization in the Unsaturated Side Chain of Steroids
Authors: Biesemans M. , van de Woude G. , van Hove L. 
Published: September 2010

Abstract5β‐androstan‐12‐one 1 and 17β‐methyl‐5β‐androstan‐12‐one 2 are efficient way from 12α‐hydroxy‐5β‐cholan‐24‐oic acid 3a. The key steps in this conversion are photochemical degradation or decarboxylation with lead tetraacetate followed by double bond isomerization of the resulting olefins.
Utilisation de la Synthèse Atrolactique Pour L'Évaluation de L'Efficacité D'Inducteurs de Synthèse Asymétrique
Authors: Ben Hassine B. , Gorsane M. , Geerts‐Evrard F. , Pecher J. , Martin R. H. , Castelet D. 
Published: September 2010

AbstractAtrolactic syntheses have been carried out to evaluate the potentiality, in asymmetric syntheses, of chiral inducers. The (dl)‐hydroxyhelicenes 1, 2, the (dl) sec. alcohols 3–12 and the (dl) phenolic binaphtyl compound 15 have been used as inducers. The d.e. are collected in table I (6–100%). The atrolactic asymmetric synthesis has also been carried out using three optically active inducers, namely: (‐)‐quinine 13, (‐)‐10, 11‐dihydroquinine 14, and R(‐)‐2, 2, 2‐trifluoro‐1‐(9‐anthryl) ethanol 6. Diastereomeric and enantiomeric excesses equal or greater than 88% have been obtained in six cases out of sixteen: (dl)‐2‐hydroxyheptahelicene 1 (d.e=100%±2), (1‐naphtyl)‐(9‐anthryl) methanol 3 (d.e=90%); 2, 2, 2‐trichloro‐1‐(9‐anthryl) ethanol 7 (d.e=100%±2), 2, 2, 2‐tribromo‐1‐(9‐anthryl) ethanol 8 (d.e=100%±2), (‐)‐quinine 13 (e.e=95.5%), and (‐)‐2, 2, 2‐trifluoro‐1‐(9‐anthryl) ethanol 6 (e.e=88%).
Study of the Influencing Factors on the Reaction of α‐halogenated Ketimines with Cyanide Ion
Authors: Kimpe Norbert De , Sulmon Paul , Schamp Niceas 
Published: September 2010

AbstractThe reaction of α‐halogenated ketimines with cyanide ion in various solvents leads to α‐cyanoaziridines. The scope and limitations of this reaction have been studied by investigating reaction parameters such as the nitrogen substituent, the solvent, the source of cyanide, the carbon skeleton and the nature of the α‐halogen. Several side reactions have been observed, including Favorskii‐type rearrangements, solvolyses, nucleophilic substitutions, 1,2‐de‐hydrohalogenation and production of heterocycles. The utility of α‐cyanoaziridines has been exemplified by 1,3‐dipolar cycloadditions of intermediate azo‐methine ylides. The addition of organolithium reagents to α‐cyanoaziridines produced α‐imidoylaziridines, which can be converted into pyrroles via rearrangement of thermally generated azomethine ylides.
Étude Comparative De La Réactivité De Composés β‐Dicarbonyles Et Des Analogues Enaminocarbonyles Vis‐À‐Vis D'Amines Hétérocycliques
Authors: Maquestiau A. , Vanden Eynde J.‐J. 
Published: September 2010

AbstractReactions between five β‐dicarbonyl compounds (1–5) or their enaminocarbonyl analogues (6–10) and three heterocyclic amines (12–14) are studied. The two types of carbonyl derivatives give rise to the formation of the same final products.Kinetic data are established, by1H NMR spectroscopy, in order to compare, in various solvents, the respective reactivity of the acyclic precursors.
Regioselectivity in the Reaction of Nitroquinoxaline‐N‐Oxides With Phosphoryl Chloride
Authors: Nasielski‐Hinkens R. , Vande Vyver E. , Nasielski J. 
Published: September 2010

Abstract6‐nitro‐, 2‐methyl‐6‐nitro‐ and 2,3‐dimethyl‐6‐nitroquinoxaline have been transformed into their N‐oxides by MCPBA in chloroform; the nitro group orients the oxygen atom preferentially to nitrogen atom N1, but the N4:N1 selectivity is diminished in the methylated derivatives.Under the action of POCl3 (the Meisenheimer reaction), the N‐oxides of the unmethylated compounds are transformed into chloro‐nitroquinoxalines having lost the N‐oxide oxygen atom. The orientation of the entering chloride ion is discussed on the basis of electronic effects induced by the N‐oxide and nitro groups, and it is suggested that the last step, the elimination of “HPO2Cl2” is a concerted process.
Synthesis of 2‐Arylindoles via Condensation of ortho‐Aminobenzyl Sulfones With Aromatic Aldehydes
Authors: Wojciechowski Krzysztof , Makosza Mieczysław 
Published: September 2010

AbstractOrtho‐Aminobenzyl sulfones condensed with aromatic aldehydes to give Schiff bases, which in strong alkaline medium undergo transformations into 2‐arylindoles.
Studies of Australian Soft Corals. XXXX.1 The Natural Products Chemistry of Alcyonacean Soft Corals with Special Reference to the Genus Lobophytum
Authors: Coll John C. , Bowden Bruce F. , König Gabrielle M. , Braslau Rebecca , Price Ian R. 
Published: September 2010

AbstractThe eggs of the alcyonacean soft coral Lobophytum microlobulatum contain the known cembranoid diterpene 3,4‐epoxynephthenol (9). This compound was not detected in the soft coral colony from which the eggs were released, although decaryiol (10), which is derived from (9) by acid treatment, was present in the eggs and coral tissue. The new diterpene decaryiol acetate (11) was a natural product in the eggs and coral. Several new non‐cembranoid diterpenes based on known eudesmane, germacrene and elemene sesquiterpene skeletons were isolated. Investigation of the chemistry of two Lobophytum species afforded diterpenes which are prenylated examples of cubebol and germacrene‐type ses‐quiterpenes (12, 18). In the course of studies of the overgrowth of soft corals by filamentous algae, a new eudesmane‐based diterpene (20) was identified. The related diterpene (19) which co‐occurs with (20), was shown to inhibit the growth of the algae Ceramium codii even at 12.5 ppm. Lobophytum chemistry is of interest because of the frequent co‐occurrence of different diterpene skeletons in the same colony, a relatively infrequent observation in other genera.
Two New C‐20 Substituted Trinervitane Diterpenes from a Neo‐Guinean Nasutitermes SP(1)
Authors: Braekman J. C. , Daloze D. , Pasteels J. M. , Roisin Y. 
Published: September 2010

AbstractTwo new 1 (15), 8 (19)‐trinervitadiene derivatives have been isolated from the frontal secretion of an undescribed species of nasute termite (Nasutitermes sp PNG (F)). They have been identified as 20‐acetoxy‐2β, 3α‐dihydroxy‐1(15), 8 (19)‐trinervitadiene (1) and 9β, 20‐diacetoxy‐2β, 3α‐dihydroxy‐1 (15), 8 (19)‐trinervitadiene (2) on the basis of their spectral properties.
New Reactions of Pyridines and Total Synthesis of the Fungal Toxin Orellanine
Authors: Tiecco Marcello 
Published: September 2010

AbstractDihalogenated pyridines react easily with sulphur nucleophiles, in dipolar aprotic solvents (DMF), to afford the products of mono‐ or of bis‐substitution depending on the experimental conditions. On the contrary, with oxygen nucleophiles the bis‐substituted products can be obtained only with some particular substrates. A new and efficient procedure to effect the homo‐coupling of halogenoarenes will be presented. This reaction, which occurs under the influence of low‐valent nickel complexes, allowed us to effect the total synthesis of Orellanine, the lethal toxin of Cortinarius orellanus mushroom, as well as the syntheses of its decomposition products Orellinine and Orelline. The chemical properties of these three products and their behaviour towards UV irradiation will be presented and discussed.
Homolytic Substitution in Trialkyltin Iodides by Photochemically Generated Iodine Atoms. V Mixed Dimethylalkyltin Iodides, Me2R'SnI
Authors: De Ryck P. H. , Verdonck L. , van Hooste H. , van Der Kelen G. P. 
Published: September 2010

AbstractMixed trialkyltin iodides form EDA complexes with iodine. The λCTdata suggest an electron transfer from the iodide lone pairs. Rate constants for the reaction under photochemical conditions are determined by kinetic measurements. The selectivity parameter derived from the rate constants and from mass spectrometric measurements prove the presence of a fragmentation step in the reaction process.
Charge‐Transfer Complexes of Isoindolines with 1, 4‐Benzoquinones
Authors: Mourad Aboul‐Fetouh E. , Nour‐El‐Din Ahmed M. , Hassan Alaa A. , Döpp Dietrich 
Published: September 2010

AbstractCharge‐transfer (CT) complexes of various N‐arylisoindolines as donors with 1, 4‐benzoquinones [2, 3‐dichloro‐5, 6‐dicyanobenzoquinone (DDQ), chloranil (CHL) and bromanil (BRL)] as π‐acceptors have been studied spectrophotometrically. Effects of substituents on CT complexation has been discussed in terms of a Hammett correlation and the wavelengths of the CT absorption maxima. Isoindolines with ortho‐substituted N‐aryl groups have been proven to be more basic than the other para‐and meta‐isomers. The nature of CT interactions in the CT complexes is reported. A linear correlation between the constants of formation and the position of maximum absorption wavelengths of the CT complexes has been observed.
Reactions of Organic Anions. CXVII1. Cleavage of the Dithiin Ring of Thioquinantrene with Some Carbanions
Authors: Jonczyk Andrzej , Pluta Krystian 
Published: September 2010

AbstractIt has been found that the C4‐S bond in 1,4‐dithiinodiquinoline 1 is cleaved by carbanions of some C‐H acids (2‐phenylalkanenitriles, ketones, sulfones) generated in DMSO by means of solid NaOH or dimsyl sodium, to give 3‐arylthio‐4‐substituted quinolines 5a‐h. Phenylacetonitrile carbanion or methoxide cleave the C4‐S bond in product 5al, giving the expected products 6 and 3‐methylthio‐4‐methoxyquinoline respectively as well as ketone 7.
Synthèse de Pyridinobenzotetraazapentalenes
Authors: Maquestiau A. , Biemans R. , Flammang‐Barbieux M. , Vilain E. 
Published: September 2010

AbstractFour new heteroaromatic pentalenes have been synthetised by reductive cyclisation with triethylphosphite of the appropriate nitropyridylbenzotriazoles or nitrophenyltriazolo [4,5‐b] pyridines: the [2,3‐b] pyridino [4,5] benzo‐1,3a,6,6a‐tetraazapentalene 2; [3,2‐c] pyridino [4,5] benzo‐1,3a,6,6a‐tetraazapentalene 3; [3,2‐b] and [2,3‐b] pyridino [5,6] benzo‐1,3a,4, 6a‐tetraazapentalene 5,6. The spectral properties of these new compounds are described.
A Note on the Synthesis of Methacrylate‐Derived Mercapturic Acid Methyl Esters
Authors: Kopecký Jan , Šmejkal Jaroslav , Linhart Igor , Hanuš Vladimir , Heyrovský J. , Pech Pavel 
Published: September 2010

AbstractThe synthesis, TLC data and spectral characteristics of mercapturic acid methyl esters derived from five industrially important methacrylates and methacrylamide are described.
Platinum(II) and Palladium(II) Complexes of Vitamin B1
Authors: Adeyemo Adegboye , Oderinde Rotimi , Turner Anne , Shamim Abdullah 
Published: September 2010

AbstractReaction of vitamin B1 and its derivatives with Pt(II) and Pd(II) salts (4:1 molar ratio) in aqueous medium, employing acetate catalyzed method2 conveniently afforded complexes of the general formula M(Th)X3, where M = Pt(II) or Pd(II) and X = Cl−, Br− or I−. These complexes have been characterized by elemental analyses, conductivity measurements, infrared and nuclear magnetic resonance spectra. Results show that coordination is via N(l) of the pyrimidine moiety in agreement with previous studies2‐9. The mechanism for the acetate catalyzed metal ion incorporation into thiamine and the possible mechanisms for the anticancer activities of these complexes are briefly discussed in terms of their interactions with DNA.
Structural Study in Relation with Captodative Substituent Effect IV. X‐Ray Study of P, P′‐Substituted 2,3‐Disethyl‐2,3‐Diphenyl‐1,4‐Butanedinitrile with Phenylogous Captodative or Dicapto‐Substitution
Authors: Parfonry A. , Tinant B. , Declercq J.‐P. , van Meerssche M. , Klein J. , Merényl R. , Viehe H. G. 
Published: September 2010

AbstractIn order to compare captodative (cd) and dicapto (cc) ‐ substitution effects on molecular geometry, we have determined by X‐ray diffractometry the structures of the four p, p′‐substituted (methylthio, dimethylamino, methoxy‐carbonyl and cyano) 2,3‐dimethy 1‐2, 3‐diphenyl‐1,4‐butanedinitrile (2a‐d). The meso isomers are found to be of centrosymmetric conformation and within experimental error the geometry of each of the four molecules is the same. No significant difference on the central C‐C bond length is observed for phenylogous cd (2a, b) and cc (2c, d)‐substitution. The mean value of the C‐C central distance is 1.602 (2)Å and much longer than expected from force‐field calculations.
Structure of 2′‐METHOXY‐4′,5′‐METHYLENEDIOXY‐2,3‐DIHYDROFURO [3″,2″‐6,7] ISOFLAVONE, NEOTENONE
Authors: Declercq J. P. , van Puyvelde L. , De Kimpe N. , Schamp N. 
Published: September 2010

AbstractC19H14O6, Mr = 338.32, monoclinic, P21, a = 10.151(4), b = 15.209(4), c = 4.959(1)Å, β = 98.54(2)°, V = 757.1(4)Å3, Z = 2, Dx = 1.48 gcm−3, Mokα, λ = 0.71069 Å, μ = 1.2 cm−1, F(000) = 352, T = 291K, R = 0.026 for 1087 observed reflections.
Trimethylsilyl Cyanide, a Reagent and (Co)Solvent “par Excellence” for Homogeneous Peptide Synthesis. A Strategy Circumventing Classical Drawbacks?
Authors: Anteunis M. J. O. , Becu Chr. 
Published: September 2010

AbstractAttention is called for a superb strategy of peptide synthesis in solution, making use of (per) silylated amino acid fragments. This old methodology may thus present renewed interest if the classical silylation is substituted by silyl cyanides during coupling. Thus, trimethylsilyl cyanide, by its pronounced silylating power affording only gaseous following‐(by) products and by its excellent solubilizing properties in organic solvents, overcomes the difficulties and drawbacks that were encountered in previously described strategies that made use of extempore prepared (per) silylated amino acid residues.
Oxidation of Hydrazines with Nitrosoarenes
Authors: Kano Kunio , Koga Masahiro , Anselme Jean‐Pierre 
Published: September 2010

AbstractNitrosoarenes react with 1,1‐disubstituted hydrazines to yield products of direct oxidation and the thermally stable triazene N‐oxides. The triazene N‐oxides undergo photoinduced fragmentation to yield products which may be rationalized through the intermediacy of diazenes.
13C‐Hyperfine Couplings of Carbonate Radicals in Carbonated Calciumapatites Synthesized at High Temperature
Authors: Callens F. J. , Verbeeck R. M. H. , Matthys P. F. A. , Martens L. C. , Boesman E. R. 
Published: September 2010

AbstractThe effect of the substitution mechanism of carbonate ions in calciumapatites synthesized at high temperature on the Electron Spin Resonance (ESR) spectrum is studied. Two pairs of 13C hyperfine lines were detected in the spectrum of all X‐irradiated B‐type carbonate apatites studied. This gives further evidence to the presence of two related CO33‐radicals in B‐type carbonated calciumapatite. For A‐type carbonate apatite no 13C satellites could be found so far. Arguments are presented to assign one of the ESR‐components to a CO3‐3 radical on a phosphate site.
Structure de la Zanhine et de la Medicagine, Deux Prosapogenines Nouvelles Isolées de Zanha Golungensis Hiern
Authors: Dimbi Makoso Zeza , Warin Roger , Delaude Clément , Huls Robert 
Published: September 2010

AbstractFrom the perchloric hydrolysis of the root bark saponin of Zanha golungensis Hiern. We have isolated two novel prosapogenins : 3β‐0‐(4‐deoxy‐β‐D‐hex‐4‐enopyranosyluronic acid), 2β‐hydoxy‐olean‐12‐en‐23,28‐dioic acid (medicagin) and 3β‐0‐(4‐deoxy‐β‐D‐hex‐4‐enopyranosyluronic acid), 2β, 16α‐dihydroxy‐olean‐12‐en‐23,28‐dioic acid (zanhin). The structures have been established by spectroscopic data. A two‐dimensional NMR of Zanhin is described.
Catalytic Reactivity of Phosphates with 1‐Butanol, Pure and in a Mixture with Acetone, Ethanol, Acetic Acid and Water
Authors: Ruwet M. , Berteau P. , Ceckiewicz S. 
Published: September 2010

AbstractPhosphate catalytic systems (B‐PO4, Al‐PO4, Ca‐Ni‐PO4) were tested in transformation of 1‐butanol, pure, and in a mixture typical of acetonobutylic fermentation feed, and compared with γ‐Al2O3 dehydration catalyst. The phosphates were characterized by infrared spectroscopy and temperature programmed desorption methods. Various 1‐butanol reactions can occur, all engaging acidic and basic sites. B‐PO4 has the convenient proportion between those sites to dehydrate pure 1‐butanol to butenes, with a good activity and selectivity, like γ‐Al2O3. Whereas Ca‐Ni‐PO4 dehydrogenates selectively 1‐butanol into butyraldehyde. With the multicomponent mixture, a drop of catalytic activities is observed for phosphates and γ‐Al2O3, due, probably, to the great amount of water in the substrate. B‐PO4 dehydration activity is much better in that case than γ‐Al2O3 one.