bluuebunny/crossref_metadata_2025_split huggingface dataset:
Correspondence
Authors: Miserez M , Grass G , Weiss C , Stützer H , Sauerland S , Neugebauer E A M 
Published: September 2010

Abstract
The Editors welcome topical correspondence from readers relating to articles published in the Journal. Responses should be sent electronically via the BJS website (www.bjs.co.uk). All letters will be reviewed and, if approved, appear on the website. A selection of these will be edited and published in the Journal. Letters must be no more than 250 words in length.
ACETYLFERROCENE SALICYLHYDRAZONE CHELATES WITH LANTHANIDE
Authors: Zhong‐Lin Lu , Xiao‐Li Wu , Yong‐Min Liang , Qing‐Bao Song , Yong‐Xiang Ma 
Published: September 2010

AbstractTwo types of complexes of acetylferrocene salicylhydrazone (H2L) with some lanthanide metals have been prepared: Na(LnL2) □ nH2O (1) (Ln = La, Nd, Sm, Dy and Yb); Ln(HL)2CI. nH2O (2) (Ln = Pr, Nd, Eu, Ho and Er). The complexes were characterized by elemental analyses, molar conductivities, IR, NMR, UV and thermal analyses. It is shown that H2L coordinates to the metal ion in bidentate or tridentate form and in enolic or keto form.
SYNTHESIS OF SOME TRANSITION METAL COMPLEXES DERIVED FROM (1‐CARBONYLMETHYL‐1H‐BENZOTRIAZOLE)‐4‐(α‐NAPHTHYL)‐3‐THIOSEMICARBAZIDE
Authors: Yulan Zhang , Hui Wu , Shaozu Wu , Pengfei Xu 
Published: September 2010

AbstractComplexes of type (ML □ XH2O)n, where M = Mn(II), Co(II), Ni(II), Zn(II), Cd(II), Pb(II), L = (1‐Carbonylmethyl‐1H‐benzotriazole)‐1‐(α‐naphtyyl)‐3‐thiosemicarbazide (NBTSH2), n = degree of polymerization, have been synthesised and characterized by elemental analyses, thermal analyses, IR, and 1H NMR spectrum of ligand.Infrared spectra show that the tetradentate ligand coordinates through the enolic oxygen, thioenolic sulphur and the nitrogen of C = N groups. The metal ion is the bridging unit between the donor sites of the ligand, and the polymeric chain grows through consecutive ligand‐metal linkages.
SYNTHESIS OF 4‐METHYL‐1‐(DIETHOXYPHOSPHINYL)‐8‐ETHYLENEDIOXY‐4(E)‐NONENE: A KEY INTERMEDIATE IN THE SYNTHESIS OF ANTITUMOR CEMBRANE‐TYPE DITERPENOIDS
Authors: Yue Xiangjun , Li Yulin 
Published: September 2010

AbstractSynthesis of 4‐methyl‐1‐(diethoxyphosphinyl)‐8‐ethylenedioxy‐4(E)‐nonene, a key intermediate in the synthesis of antitumor cembrane‐type diterpenoids isolated from soft corals is first described in 54.5% overall yield from E‐geranyl acetone through seven steps.
LE 2‐HYDROXYMETHYLBENZIMIDAZOLE PRECURSEUR DE SYNTHESE DE NOUVEAUX SYSTEMES HETEROCYCLIQUES
Authors: Essassi E. M. , Fifani J. , Hamamsi I. 
Published: September 2010

AbstractThe easy synthesis of 2‐hydroxymethylbenzimidazole, leads us to use this compound in the preparation of new heterocyclic systems.
RELATIONSHIP BETWEEN CATHODIC PEAK POTENTIALS AND THEORETICALLY CALCULATED LUMO ENERGIES OF SOME 2‐PHENYL BENZOXAZOLE DERIVATIVES
Authors: Güllü M. , Yalçin I. , Şener E. , Türker L. , Çelebi N. , Akbulut U. 
Published: September 2010

AbstractCathodic peak potentials (Ep,c) of twentyseven microbiologically active 2‐phenyl‐benzoxazole derivatives containing both electron withdrawing and electron donating groups on benzoxazole kernel and on phenyl moiety were measured by cyclic voltammetry in acetonitrile. The Ep,c values were in the range of ‐2.8 V to ‐3.10 V except for those compounds which contained ‐NO2 substituent at position‐5. Those benzoxazole derivatives possessing a NO2 group all had substantially lower reduction peak potentials, ranging from ‐1.60 to ‐1.80 V versus Ag/Ag+. The lowest unoccupied molecular orbital (LUMO) energies of these molecules were calculated by adopting the Hückel molecular orbital (HMO) approach. A linear relationship was found to be existing between the measured Ep,c values and the calculated LUMO energies.
DETERMINATION OF Ru(III) IN REFINED ORES BY FLOW INJECTION ‐Kinetic Methods
Authors: Xingguo Chen , Haiping Gong , Rong Yang , Zhide Hu 
Published: September 2010

AbstractThree flow injection‐kinetic methods have been developed for the determination of trace amount of ruthenium, based on its catalytic effect on the m‐ sulfo‐ chlorophosphonazo (I)‐KIO4(RI), 2‐[(5‐Bromo‐2 ‐pyridyl)azo]‐ 5‐ diethylaminophenol (II)‐KIO4(RII), and azocarmine B (III)‐KIO4(RIII) reactions, respectively. The reactions are followed spectrophotometrically by measuring the decrease in the absorbance at 551 nm, 500 nm and 532 nm, respectively. The sampling frequency of the RI, RII and RIII being 86 h–1, 48 h–1 and 40 h–1, the calibration curves have linear ranges between 2.00 × 10–7and 1.40 × 10–6 mol/L, 2.00 × 10–7 and 3.20 × 10–6 mol/L and 2.00 × 10–7 and 2.00 × 10–6 mol/L, with detection limits of 1.00 × 10–7 mol/L, 1.20 × 10–7 mol/L and 1.00 × 10–7 mol/L, respectively. The proposed methods were applied to the determination of trace amount of ruthenium in refined ores with satisfactory results.
ETUDE DE LA SYNTHESE DU DIMETHYLTETRAMETHYLENETRATHIAFULVALENE (DMCTTF): PREPARATION DE SES COMPLEXES AVEC DES ACCEPTEURS DU TYPE [M(dmit)2](M = Ni; Pd; Pt)
Authors: Fabre J. M. , Amouroux J. , Garreau B. , Legros J. P. 
Published: September 2010

AbstractThe Wittig‐Horner type synthesis of the unsymmetrically substituted tetrathiafulvalene: dimethyltetramethylene‐tetrathiafulvalene (DMCTTF) has been studied in detail allowing us to improve the yield of this donor in comparison with the results obtained so far in the literature.Three DMCTTF[M(dmit)2]y complexes have been prepared by the well known galvanostatic‐electrocrystallization technique (M = Ni, Pd, Pt).Their room‐temperature conductivity has been measured indicating a quite high value (0,75 S/cm) for the salt involving palladium (M = Pd).
Synthesis of Conjugated Dienes from Propene or other Alkenes by the Ene‐type Reaction of Thionium Ions
Authors: Schmitz Carole , Harvey Jeremy N. , Viehe Heinz G. 
Published: September 2010

AbstractThe known ene‐type addition of thionium ions to alkenes has now been applied to the synthesis of homoallylic sulfides, from thionium ions RHCS+ Ar (R = alkyl, Ar = 4‐chlorophenyl) and propene or other unactivated alkenes. Oxidation and thermal dehydrosulfenylation then lead to conjugated dienes. Because the reaction conditions are compatible with many functional groups, this method is simple and useful.
DECONTAMINATION DOUCE DE TOXIQUES ORGANOPHOSPHORES ET SOUFRES PAR QUELQUES DERIVES DE L'EAU OXYGENEE
Authors: Lion Claude , Hedayatullah Mir , Charvy Claude , Vincent StÉPhane , Briand Sylvette , Boileau Jacques , Delmas GÉRard , Magnaud Gilbert , Desgranges Michel , Sentenac‐Roumanou Henri 
Published: September 2010

AbstractSome complexed stable hydrogen peroxides (percarbonates, perhydrol, DABCO,2 H2O2) have been studied in the destruction of paraoxon (O,O‐diethyl paranitrophenylphosphate) and PhCH2CH2SCH2CH2CI. The reaction goes to completion in a short time specially in the presence of long chain tetraalkyl ammonium salts. With other peroxides (alkyl or arylhydroperoxides, bis‐trimethylsilyl‐ or bis‐triethylgermylperoxides) the reaction is slower.
CRYOCHEMICAL SYNTHESIS OF THE GIANT MAGNESIUM CLUSTERS IN AMINE MEDIA
Authors: Kondakov Sergei E. , Smirnov Vladimir V. 
Published: September 2010

AbstractSize dependence of ultrafine magnesium particles (giant clusters) in cryochemical synthesis on various types of tertiary amine was found. New way for controlled production of various particles by means of organic components under the same synthetic conditions was discovered.
ELECTRONIC AND VIBRATIONAL POLARIZABILITIES OF BUCKMINSTERFULLERENE
Authors: Perpète Eric A. , André Jean‐Marie , Champagne BenoǏT , Senet Patrick , Lambin Philippe , Lucas Amand A. 
Published: September 2010

AbstractThe static average electronic and vibrational contributions to the electric dipole polarizability of buckminsterfullerene are computed. The Finite Field Self Consistent Field method and scaling laws are used to evaluate the electronic contribution whereas the vibrational contribution is determined by using the harmonic oscillator approximation and an empirical force constant model. With the 3‐21G split‐valence atomic basis set, the computed electronic and vibrational contributions are 574.7 and 8.2 atomic units, respectively.The effect of the bond length alternation on the electronic polarizability is shown to be very weak. Noticing that the polarizability of buckminsterfullerene is close to that of ten benzene molecules, the buckminsterfullerene molecule can be seen as an entity formed by aromatic hexagons placed side by side where the electron delocalization all over the system is weak. The vibrational contribution to the static polarizability is found in good agreement with experimental measurements deduced from high resolution electron energy loss spectroscopy spectra whereas infrared spectra provide much smaller values.
BIOELECTROCATALYTICAL DETERMINATION OF SOME HEAVY METALS AND THEIR INFLUENCE ON THE CATALYTIC ACTIVITY OF THE IMMOBILIZED ACETYLCHOLINESTERASE
Authors: Stoytcheva Margarita 
Published: September 2010

AbstractOn the basis of the process of the acetylthiocholine iodide hydrolysis, catalysed by the enzyme acetylcholinesterase and the obtaining of an electroactive product, an amperometric sensor is created. An electrochemically modified graphite electrode is used, with acetylcholinesterase covalently linked directly on its surface. It is demonstrated that it can be applied for the quantitative determination of some heavy metal ions ‐ Fe3+, Cd2+, Cu2+ and Mn2+ and for establishing their influence on the acetylcholinesterase activity.
AVANTAGES DES INDICES DE RETENTION CALCULES PAR INTERPOLATION SPLINE CUBIQUE EN CHROMATOGRAPHIE EN PHASE GAZEUSE A TEMPERATURE PROGRAMMEE
Authors: Ferchichi Loubna , Nouar Leila , Gheid Abd‐El‐Hak , Messadi Djelloul 
Published: September 2010

AbstractRetention indices computed by cubic spline interpolation for some plasticizers have smaller standard deviations, and are more constant at different heating rates than the corresponding ones obtained in a classical manner. Furthermore, the retention indices determined by the spline model behave more linearly and are, in general, consistent with concept of significant temperature.
CRYSTAL STRUCTURE OF (20R)‐11β,20‐DIHYDROXY‐20‐PHENYLPREGN‐4‐EN‐3‐ONE
Authors: Tinant B. , Declercq J. P. , Bjelakovic M. , Lorenc Lj. , Mihailovic Lj. 
Published: September 2010

AbstractThe Grignard reaction of 11β‐hydroxy‐3,3‐(ethylenedioxy)‐pregn‐5‐en‐20‐one (1) affords both epimers (20R) (2) and (20S) (3) of the hydroxy derivative. The configuration R at C20 is established for the predominant epimer by the determination of the X‐ray structure of the deketalized analog 4. C27H36O3, Mr = 408.58, orthorhombic, P212121, a = 30.009(11), b = 6.323(1), c = 12.182(9)Å, V = 2312(2)Å3 Z = 4, Dx = 1.17 g.cm−3, CuKα radiation (λ = 1.5418Å). The final R indice is 0.079 for 2058 observed reflections
AN;11,12‐DIHYDROXY‐13‐ISOPROPYL‐1,8,11,13‐PODOCARPATETRAENES
Authors: Hu Yun‐Jin , Tian Yuan , Yan Shi‐Qiang , Pan Xin‐Fu 
Published: September 2010

AbstractA first expeditious total synthesis of (±)‐11,12‐dihydroxy‐13‐isopropyl‐1,8,11,13‐podocarpatetraenes by a stereoselective cycloalkylation route is described.
Synthesis of Isoxazolo[4,5‐D]Pyrimidinones, and their Isomerization into Oxazolo[4,5‐D]Pyrimidinones on Flash Vacuum Pyrolysis
Authors: Laurent Sophie , Barbieux‐Flammang Monique , Haverbeke Yves Van , Flammang Robert , Wentrup Curt 
Published: September 2010

AbstractA series of new 3‐phenylisoxazolo[4,5‐d]pyrimidinones 5a‐d were prepared from 5‐aminoisoxazole‐4‐carboxylic acid esters. Upon flash‐vacuum pyrolysis, these heterocycles are isomerized into hitherto unreported 2‐phényloxazolo[4,5‐d] ‐pyrimidinones 8a‐d.
Two new Kalihinenes from the Marine SpongeAcanthella Cavernosa
Authors: Braekman J. C. , Daloze D. , Gregoire F. , Popov S. , van Soest R. 
Published: September 2010

AbstractKalihinene‐A [17] and kalihinene‐B [18] two new toxic isocyano diterpenes have been isolated from a Seychelles specimen of the marine spongeAcanthella cavernosa.Their structures were elucidated by interpretation of their spectral properties. The chemotaxonomic value of these secondary metabolites is discussed.
Photochemistry of Ruthenium(II)‐TRIS‐1,4,5,8‐Tetraazaphenanthrene with Mononucleotides: Role of Ligand Photosubstitution
Authors: Lecomte† J.‐P. , Kirsch‐De Mesmaeker A. , Kelly J. M. 
Published: September 2010

AbstractThe photochemistry of Ru‐tris‐(1,4,5,8‐tetraazaphenanthrene) (Ru(tap)32+) in the absence and in the presence of adenosine‐5′‐monophosphate (AMP) and guanosine‐5′‐monophosphate (GMP) has been studied by flash photolysis and by steady state illumination. Laser pulsed irradiation of Ru(tap)32+ in the presence of AMP produces, with a rather low yield, the transient reduced complex, Ru(tap)31+, by electron transfer from AMP to the excited complex. The flash photolysis of the same solution, after pre‐illumination, shows that a new photoactive compound absorbs at = 500 nm and its efficiency of production decreases at lower temperature and pH. Comparison with the photodechelation of Ru(tap)32+ in the absence of mononucleotide, and with the photoadduct formation between Ru(tap)32+ and GMP/AMP, leads to the conclusion that this photoactive species could correspond to [Ru(tap)2AMP, X]n+ formed by photosubstitution of a tap ligand in the presence of AMP.
Synthesis of Trans‐5‐Methylproline and its Influence on CIS‐Trans Isomerism in β‐Casomorphin‐5
Authors: Tourwé D. , van Betsbrugge J. , Verheyden P. , Hootelé C. 
Published: September 2010

AbstractStarting from L‐proline, trans‐5‐methylproline has been prepared using electrochemical oxidation followed by methylcopper substitution. After incorporation of this amino acid into β‐casomorphin‐5 at the two and four position, an NMR study revealed only limited influence on the cis/trans ratio of the peptide bond. The opioid receptor affinities did not allow to confirm the requirement for a cis Tyr‐Pro peptide bond for biological activity.
Functionalized Hydantoins as Potential Antibiotics
Authors: Marchand‐Brynaert Jacqueline , Amadei Edith , Ghosez Leon 
Published: September 2010

AbstractThe 5‐acylamino‐3‐acetylhydantoin derivatives 8 were designed as potential antibiotics mimicking lactivicin 1. The racemic compounds 19a‐c, prepared in six steps from 5‐oxohydantoin, were inactive onto bacterial tests.
Definitive Study of the Determination of Polybrominated Dibenzo‐P‐Dioxins and Polybrominated Dibenzofurans in Decabromodiphenyloxide and Tetrabromobisphenol‐A
Authors: Ranken Paul F. , Freiberg Miriam , Mazac Charles J. , Bauer Mark R. , Varcoe Frederick T. , Tondeur Yves 
Published: September 2010

AbstractAnalytical methodology has been developed for the isomer specific analysis of fifteen 2,3,7,8‐substituted polybrominated dibenzo‐p‐dioxins and polybrominated dibenzofurans in decabromodiphenyloxide and tetrabromobisphenol‐A. The procedures, developed by the Brominated Flame Retardant Industry Panel, Triangle Laboratories, Incorporated, and Battelle, have been shown to afford accurate and precise measurements of the analytes in these matrices. Analysis of multiple DBDPO and TBBPA samples, collected at random, show that none of the analytes are present in concentrations at or above specified limits of quantitation.
The Temperature Dependence of the Intermolecular Excimer Formation: a Study of the Time‐Resolved Fluorescence by Global compartmental Analysis
Authors: Declercq D. , Vanoppen P. , Hermans E. , De Schryver F. C. 
Published: September 2010

AbstractThe excimer formation of 1‐pyrenylpentametyldisilane (P2) in isooctane is studied as a function of concentration and temperature. This contribution shows for the first time how the global compartmental analysis can be used to determine the temperature dependence of the excited state processes of an excimer forming species, i.e. the activation energy of excimer formation and excimer dissociation, the stabilisation enthalpy of the excimer (ΔH0) and the entropy change of the excimer formation. The activation energy of excimer formation is found to be larger than the activation energy for viscous flow.
Lewis Acid Mediated Reaction of Selenoacetals with Allylsilanes and Allylstannanes: Synthesis of Homoallylselenides
Authors: Hermans Bernard , Hevesi LÁSzlÓ 
Published: September 2010

AbstractSelenoacetals react with allyltrimethylsilane in the presence of tin tetrachloride to produce homoallyl selenides in moderate to good yields. Aliphatic acetals react less efficiently than do aromatic ones, especially when steric factors can play a significant role. The use of allyl stannanes as nucleophiles is complicated by transmetallation side reactions with Lewis acids; in the case of tin tetrachloride this is the only observable transformation. However, non transmetallating Lewis acids such as BF3 OEt2, ZnCl2, AlCl3, etc., also allow the synthesis of homoallyl selenides from selenoacetals and allyl stannanes. The reaction of bis(methylseleno)phenylmethane with tributylcrotylstannane gave a diastereoisomeric mixture of homoallyl selenides where the syn isomer predominated (syn/anti = 70/30), whereas the reverse stereoselectivity was observed for the reaction of 1,1‐bis(methylseleno)‐2‐phenylpropane with allyltributylstannane.
Intramolecular Diels‐Alder Reaction of 8‐Trifluoromethyl‐1,3,8‐Nona‐Trienes: An Access to Angular Trifluoromethylated Hydrindenes
Authors: Zhu Gui‐Dong , Lancker Bart Van , Haver Dirk Van , De Clercq Pierre J. 
Published: September 2010

AbstractThe intramolecular Diels‐Alder reaction of 8‐trifluoromethyl‐1,3,8‐nonatrienes as a possible route toward angular trifluoromethylated hydrindenes is explored for the first time. As in the case of the parent 3‐methyl nonatrienes, the cycloaddition was found to give predominantly trans‐fused adducts.
Synthesis and Characterization of the CIS and TRANS Isomers of Ph3Sn‐CHCH‐C(OH)RR' Compounds and their GEM Analogs. Evidence for an Intramolecular HO→Sn interaction In the solid and Solution State
Authors: Kayser FranÇois , Biesemans Monique , Delmotte Ann , Hendrix Robert , Malschaert Patrick , Verbruggen Ingrid , Mahieu Bernard , Willem Rudolph , Gielen Marcel 
Published: September 2010

AbstractThe cis and trans isomers of compounds of the type Ph3Sn‐CHCH‐C(OH)RR' as well as their gem analogs were synthesized and characterized. Mössbauer spectroscopy enabled to assess the presence of weak intramolecular HO→Sn interactions in the cis and gem isomers in the solid state. In solution, the existence of such coordinations was evidenced by 13C and 119Sn Secondary Isotope Multiplet of Partially Labelled Entities (SIMPLE) NMR. We correlate the results of our NMR experiments with the reactivity of these compounds towards iodine.
Improved Enantioselectivity in the Inverse Electron Demand Diels‐Alder Cycloadditions of 3‐Carbomethoxy‐2‐Pyrone Catalysed by Chiral Ytterbium Complexes
Authors: Markó István E. , Evans Graham R. , Declercq Jean‐Paul , Feneau‐Dupont Janine , Tinant Bernard 
Published: September 2010

AbstractWhen catalysed by the Kobayashi: Yb(OTf)3‐Binol complex, vinyl ethers and vinyl sulphides undergo highly enantioselective IEDDA reactions with 3‐carbomethoxy‐2‐pyrone.
X‐Ray Structures of CIS and TRANS Isomers of 1,2‐Dimethyl‐3‐Ethyl 2,3‐Dihydropyrrolo[1,2‐F]Phenanthridine‐1,2,3‐Tricarboxylate
Authors: Tinant B. , Declercq J. P. , Dostal J. , Potacek M. 
Published: September 2010

AbstractThe two title isomers were obtained in 1,3‐dipolar cycloaddition of the same ylide 2, with dimethyl fumarate and dimethyl maleate, respectively. Their stereochemistry was established by X‐ray diffraction analysis. The molecular geometries of the two isomers are compared.
Synthesis of BAPTA‐AM Analogues Capable of Enhancing the Vascular production of Prostacyclin
Authors: Heilporn S. , Broeders F. , Daloze D. , Braekman J. C. , Boeynaems J. M. 
Published: September 2010

AbstractAbout 30 analogues of BAPTA‐AM, a potential antithrombotic agent, have been synthesized and tested for their effect on the production of prostacyclin. None of them was found to be a better enhancer of the production of prostacyclin by aortic endothelial cells than BAPTA‐AM itself. The enhancing effect can be produced by compounds unable to chelate Ca2+, thus confirming that it is not related to their buffering capacity for free Ca2+.
Ring Opening of Donor‐Substituted Furans by Dimethyl 2,3‐Dicyanofumarate
Authors: Huisgen Rolf , Mloston Grzegorz 
Published: September 2010

AbstractDimethyl 2,3‐dicyanofumarate and 2,3‐dicyanomaleate are equilibrated by 2‐methoxyfuran or 2‐p‐tolyloxyfuran in a fast initial reaction via a zwitterionic intermediate; the latter is likewise responsible for the ring‐opening of the heterocycle and the 5‐substitution of the donor‐furans. Products are the (Z)‐3‐cyclopropylacrylic esters 20‐22 as well as the furyl‐substituted succinic esters 16 and 17. The mechanistic implications are discussed.
Modelling of CF2HCl Consumption in H2/O2/Ar Flames
Authors: Richter H. , Vandooren J. , van Tiggelen P. J. 
Published: September 2010

AbstractThe aim of this work is the investigation of the relative contribution of reactions (1) CF2HCl + H → CF2H + HCl, (2) CF2HCl + O → CF2Cl + OH and (3) CF2HCl + OH → CF2Cl + H2O to the initial CF2HCl attack in lean, stoichiometric and rich H2/O2/Ar flames. The mole fraction profiles have been computed by means of the PREMIX code. Using the rate coefficient k1= 4.65 1014exp(‐7730/T) cm3mole−1s−1, k2= 6.62 1012exp(‐4228/T) cm3mole−1s−1and k3= 1.28 1012exp(‐1671/T) cm3mole−1s−1the contribution of reactions (1), (2) and (3) has been calculated by integration throughout the flame front. The results show an obvious dependence on the equivalence ratio. In rich and stoichiometric flames CF2HCl is consumed nearly exclusively by H‐radicals, while in the lean flame H contributes to 43%, O to 32% and OH to 25% of the CF2HCl disappearance rate. The computed results of the stoichiometric flame compare favourably with experiments.
Theoretical Investigation of Some Evidences of the Captodative Effect
Authors: Leroy G. , Dewispelaere J. P. , Benkadour H. , Riffi Temsamani D. , Wilante C. 
Published: September 2010

AbstractIn this paper, the stability and reactivity of some gem‐disubstituted closed‐shell and open‐shell systems are investigated using the unifying concept of thermodynamic stabilization energy. We deduce this quantity either from available experimental data or from enthalpies of formation obtained at various theoretical levels. The energies of open‐shell species, medium‐size closed‐shell systems and large diamagnetic compounds are respectively calculated at the CISD/6‐31 G(d,p), MP2 = FULL/6‐31 G(d,p) and HF/6‐31 G(d,p) levels.It is found that captodative (cd) substitution significantly stabilizes carbon‐centred radicals and ethylenic compounds but generally destabilizes methane derivatives. Didative (dd) substitution most often stabilizes both the methyl radicals and their parent molecules. Finally most cc‐substituted species are destabilized. On the whole, the cdCH2 compounds do actually have the smallest C‐H bond strengths due to the joint action of the captodative and stereoelectronic effects. For this reason, they deserve to be named proradical. Consequently hydrogen transfer reactions are strongly favoured by captodative substitution which explains the selectivity induced by this substitution in dehydrodimerization reactions. Radical additions to alkenes are facilitated by dicaptor and captodative substitutions while donor groups have a relatively small influence on the thermochemistry of these reactions. In the absence of steric effects, didative and captodative olefines could probably give rise to radical polymerization.