bluuebunny/crossref_metadata_2025_split huggingface dataset:
Etudes sur les composés organométalliques XIV. Réactivité du tétrabenzyltitane (lère communication)
Authors: Causse Jacques , Tabacchi Raffaele , Jacot‐Guillarmod André 
Published: December 2004

AbstractThe reactivity of tetrabenzyltitanium with acetone, benzophenone, butanal, acetyl chloride, butyl acetate, ethyl chloroformate, benzonitrile, propylene oxide, carbon dioxide has been investigated.The results show that tetrabenzyltitanium reacts like benzylmagnesium‐chloride. The socalled ‘anomalous reaction’ is observed. Benzonitrile, propylene oxide and carbon dioxide, on the other hand, do not react.
Präparative Darstellung von μ‐Disauerstoff‐bis‐kobalt(II)‐Chelaten
Authors: Zehnder M. , Fallab S. 
Published: December 2004

AbstractBinuclear cobalt chelates with O2 as bridging ligand have been prepared, using ethylenediamine, triethylenetetramine, tetraethylenepentamine and tris‐(2‐aminoethyl)‐amine as chelating agents and SCN− and ClO4− as anions. They form well characterized crystals which give off molecular oxygen spontaneously in acid solution and, except in the case of the cobalt tetra‐ethylenepentamine chelate, reveal the general composition [(Z)Co · μ(O2, OH) · Co(Z)]X3, where Z represents the polydentate complexing agents and X the anion. In the presence of ammonia different complexes are produced, in which NH3 occupies one coordination site of each cobalt, replacing the hydroxo bridge.
Über die Ausdrucksweisen der Konzentration des Wasserdampfes bei Wasserdampf‐Sorptionsmessungen
Authors: Gál S. 
Published: December 2004

AbstractThe definitions of the partial pressure of water vapor, the activity of water, the relative humidity and the partial relative density of water vapor are reproduced and their functional relationships are given. The numerical values of these variables between −10°C and +100°C and at total pressures between the pressure of the own vapor and 10,133 mbar have been computed and tabulated (tables available in form of microfilm or xerox‐copies from Buchhandlung Herbert Lang & Cie, Münzgraben 2, CH‐3000 Bern). The limits of indistinct use of these variables are discussed.
Die Photochemie von Diazo‐dibenzoylmethan Eine wellenlängen‐ und temperaturabhängige Photoreaktion
Authors: Baumann N. 
Published: December 2004

AbstractDiazo‐dibenzoylmethane I undergoes two primary photochemical processes leading to α‐phenyl‐α‐benzoyl‐methane II and dibenzoylmethane III. The formation of II is related to the lowest excited singlet state of I and the formation of III is related to the lowest excited triplet state of I. The quantum yields of both processes (ΦII, ΦIII) are strongly wavelength dependent. It is unambiguously demonstrated, that the population of the two excited states depends on the energy of the exciting light, thus causing a wavelength effect. There is shown to be an activation barrier controlling the rate of intersystem crossing from the S1 to the T1 level of I.
Triplet‐Triplet Absorption Spectra of Aromatic Hydrocarbons: I. Naphthalene
Authors: Wild Urs P. , Känzig Herbert , Ranalder Urs B. 
Published: December 2004

AbstractThe difference between the triplet‐triplet and singlet‐singlet absorption spectrum of naphthalene has been measured at 90°K using a newly developed computer controlled spectrograph. Good spectral resolution has been obtained and a strong band was found in the ultraviolet region. Recent calculations are compared with the triplet‐triplet spectrum of naphthalene.
Heterotricyclodecane XI, Sulfoxide und Sulfone von 2‐Oxa‐7‐thia‐isotwistan und 2‐Oxa‐7‐thia‐twistan sowie Derivaten
Authors: Wigger N. , Stücheli N. , Szezepanski H. , Ganter C. 
Published: December 2004

AbstractThe synthesis of sulfoxides and sulfones of 2‐oxa‐7‐thia‐isotwistane (24) and 2‐oxa‐7‐thia‐twistane (35) as well as of several of their derivatives is described. endo‐2‐Hydroxy‐9‐thiabicyclo[3.3.1]non‐6‐ene (5) was used as starting material.During the course of the reactions special attention was given to intramolecular hydroxy‐mercuration and jododemercuration reactions, spectroscopic features, molecular rearrangements and stereospecificity of oxidations of sulfides to sulfoxides.
Nucleophilic Substitution in Dipolar Aprotic Solvents: Hexamethylphosphoric triamide
Authors: Müller Paul , Siegfried Bernard 
Published: December 2004

AbstractThe rate of the reaction between ethyl tosylate and chloride as well as bromide ion has been measured in hexamethylphosphoric triamide in the presence of several counterions. Rate constants for the free ions at 25.0° are 14.4 mole−1 for chloride and 2.0 mole−1min−1 for bromide, both independent of the cation used. The equilibrium constants for ion pair dissociation of lithium‐, ammonium‐ and tetra‐n‐butylammonium chloride are 3.97 × 10−2, 1.52 × 10−3 and 6.36 × 10−3 mole, and for the corresponding bromides 3.30 × 10−2, 9.65 × 10−3, and 9.62 × 10−3 mole.
Tubotaiwin‐N‐oxid aus der Wurzelrinde von Conopharyngia johnstoni Stapf. 148. Mitteilung über Alkaloide
Authors: Pinar M. , Renner U. , Hesse M. , Schmid H. 
Published: December 2004

AbstractFrom the root bark of Conopharyngia johnstonii Stapf (Apocynaceae) the hitherto unknown tubotaiwine‐N‐oxide (2) together with tubotaiwine (1) were isolated and characterized.
Oxydationsprodukte von 6‐Hydroxy‐dopamin
Authors: Wehrli P. A. , Pigott F. , Fischer U. , Kaiser A. 
Published: December 2004

Abstract6‐Hydroxy‐dopamin (2, 4, 5‐Trihydroxyphenäthylamin) (1) wird durch Sauerstoff oder durch Frémy‐Salz nahezu quantitativ zu einem dunkelroten Chinon oxydiert, das sich in gelbe Hydrohalogenide überführen lässt. Das wahrscheinlich als Zwitterion 2 vorliegende Chinon ist in kristalliner Form stabil. In schwach alkalischer Lösung lagert es sich in 5, 6‐Dihydroxy‐indol (4) um. Alkalische Reduktion führt u.a. zu 5, 6‐Dihydroxy‐indolin, während unterhalb pH 7 hauptsächlich 6‐Hydroxy‐dopamin (1) zurückgebildet wird.
Metastabile, basische Bleisalze des 2,4,6‐Trinitroresorcins
Authors: Durtschi André , Rauber Walter 
Published: December 2004

AbstractBeim Zusammengiessen einer alkalischen Lösung von 2,4,6‐Trinitro‐resorcin mit einer Bleilösung entstehen zwei metastabile Bodenkörper, und zwar bei pH 5–9 eine neue Modifikation (I) des bereits bekannten Pb2(OH)2Tric (Tric = Anion des 2,4,6‐Trinitro‐ resorcins), und bei pH 10–12,5 Pb7(OH)10Tric2 (II). I wandelt sich in die bekannte stabile Form um, II reagiert bis pH 11 zu Pb5(OH)6Tric2, darüber zu Pb13O7(OH)10Tric2.
Chemische und pharmakologische Studien über Derivate des Benzo[de]chinolins (I). 8. Mitteilung über natürliche und synthetische Isochinolinderivate
Authors: Schneider Fernand , Gerold M. , Bernauer Karl 
Published: December 2004

AbstractSynthesis and cardiovascular evaluation of ketones 10, 11 and 12 and of their derivatives 14 to 35 are described.
Cycloaddition von Heterocumulenen an CN‐Bindungssysteme. 1. Mitteilung. Perhydro‐s‐triazindione und Perhydro‐s‐triazinyl‐harnstoffe aus N,N,N′‐trisubstituieten Formamidinen und Isocyanaten
Authors: Seckinger Karl 
Published: December 2004

AbstractThe addition of methyl isocyanate to N,N‐dimethyl‐N′‐arylformamidines 4d–4r leads to the perhydro‐s‐triazine‐diones 5d–5o and to the s‐triazinylureas 10a–10k. The mechanism of formation is discussed.The addition of the arylisocyanates 18a–18p to the N,N,N′‐trialkylformamidines 9 and 27a–27i furnishes the expected 1,4‐cycloaddition products 26 and 27 in good yields. The N,N‐di‐isopropyl‐N′‐alkylformamidines 27j–271, however, do not undergo 1,4‐dipolar cycloadditions and react with the arylisocyanate 18b to yield the alkyl isocyanates 31a–31c and N,N‐diisopropyl‐N′‐(p‐chlorphenyl)‐formamidine 32 exclusively.
Die Photoelektronen‐Spektren methyl‐substituierter Acetylene
Authors: Brogli Franz , Heilbronner Edgar , Hornung Volker , Kloster‐Jensen Else 
Published: December 2004

AbstractThe PE.‐spectra of triacetylene 1 (3), methyldiacetylene 2 (2), dimethylacetylene 3 (1) and dimethyldiacetylene 3 (2) have been recorded. The π‐ionization potentials of the unsubstituted acetylenes can be parametrized in terms of a LCBO‐model.
Reduction of Tosylamino Acids and Related Compounds with Sodium in Liquid Ammonia; stoichiometry and products
Authors: Rudinger Josef , Van Den Brink‐Zimmermannová Helena Maassen 
Published: December 2004

AbstractUsing an extraction procedure which permits determination of end‐points, the reduction of a number of tosylamino acids, their derivatives, and model compounds with sodium in liquid ammonia has been investigated. When the molecule contains a single acidic group in addition to the tosylamino group (as in the case of the simple mono‐tosylamino monocarboxylic acids) reduction proceeds with the consumption of 2 g‐at. Na per tosyl group and the formation of toluene‐4‐sulphinic acid. If the number of acidic groups in the products is insufficient to accommodate the number of electrons consumed in the reduction, the reduction of ionisable tosylamino groups is incomplete unless an acid is added. If the number of acidic groups is higher, or excess acid is added, the sulphur‐containing products include thiocresol and sulphite. This last reaction course is also observed whenever calcium is used in place of sodium. A partial interpretation of the results is offered.
Der Mechanismus der Umlagerung substituierter Aminoacrylderivate
Authors: Niederhauser Andreas , Bart Gerhard , Neuenschwander Markus 
Published: December 2004

AbstractThioacetic acid and dithioacetic acid react with alkynederivatives of the type (CH3)2NCCCOR (1) in the same way as other carboxylic acids: The addition to dimethylaminopropinal (1a) at low temperatures yields, after rearrangement of the very instable primary adducts,Z‐3‐acetoxy‐N,N‐dimethyl‐thioacrylamide (Z‐16) andZ‐3‐thioacetoxy‐N,N‐dimethylthioacrylamide (Z‐17) respectively. The structure of the two compounds can be proved by spectroscopic evidence of16and18, the latter being formed by elimination of thioketene from17. According to the distribution of S‐atoms in16and17, two reaction pathways including 4‐membered rings can be ruled out. Thus the rearrangement of 3‐acyloxy‐N,N‐dimethyl‐acrylamides most probably proceeds by a mechanism including a dipolar six‐membered intermediate.This mechanism cannot be valid for the rearrangement of the adducts2of hydrohalogen acids, alcohols and amines to the alkyne‐derivatives1. The acid‐catalysed reaction of 3‐chloro‐3‐dimethylamino‐propenal (2, XCl), labelled at position 1 with13C, yields 3‐chloro‐N,N‐dimethyl‐acrylamide (3, XCl), containing the label exclusively at position3. This result supports a mechanism including an immonium‐oxetene21(XCl) as intermediate. ‐ The experiments are in accord with kinetic investigations.
Zur Photochemie von 3,5‐Diaryl‐2‐isoxazolinen. 30. Mitteilung über Photoreaktionen
Authors: Giezendanner Heinz , Rosenkranz Hans Jürgen , Hansen Hans‐Jürgen , Schmid Hans 
Published: December 2004

AbstractIrradiation of 3,5‐diphenyl‐ or 3‐(p‐tolyl)‐5‐phenyl‐2‐isoxazoline (12 and 13, respectively) in benzene with a high‐pressure mercury lamp yields 4,5‐diphenyl‐ or 4‐(p‐tolyl)‐5‐phenyl‐3‐oxazoline (17 and 19, respectively) and the β‐amino‐chalcones 18 or 20 in addition to benzaldehyde, benzonitrile and p‐tolunitrile, respectively (scheme 6 and ‘Anmerkg.’ p. 2600). The 3‐oxazolines 17 and 19 are formed by route a (scheme 8) via 3‐phenyl‐ or 3‐(p‐tolyl)‐2H‐azirine (23, R = H and CH3, respectively) and their photochemically rearranged successors, the nitrile methylides 24, as intermediates. The discovery of this reaction has served as a basis for the quickly developing photochemistry of 3‐aryl‐2H‐azirines [2] [24].Photolysis of the 2‐isoxazoline 13 in methanol leads to the formation of a mixture of syn/anti‐p‐tolyl trans‐styryl ketoximes (syn/anti, trans‐30) and anti, cis‐30, 2‐(p‐tolyl)‐quinoline (29), the 4‐hydroxymethylated derivative 32 of the latter (in small amounts), besides the β‐aminochalcone 20, benzaldehyde, p‐tolualdehyde and p‐tolunitrile (scheme 9). It could be shown that the stereoisomeric ketoximes 30 are photochemically interconvertible (scheme 12) and that at least one mechanism of formation of 2‐(p‐tolyl)‐quinoline (29) is the photo‐induced cyclisation of p‐tolyl‐cis‐styryl ketoximes (cis‐30) (scheme 13). A tentative mechanism for the formation of p‐tolual‐dehyde is given in scheme 10; the crucial step is the protonation of p‐tolunitrile methylide (24, R = CH3) by methanol at the nitrile carbon atom, after which hydrolysis yields the aldehyde.
Photochemisches Verhalten von N‐Acyl‐11‐methyl‐hexahydrocarbazolen
Authors: Winkler‐Lardelli Barbara , Rosenkranz Hans Jürǵen , Hansen Hans‐Jürǵen , Schmid Hans , Blank Bernd , Fischer Hanns 
Published: December 2004

AbstractThe irradiation of N‐acylated 11‐methyl‐1,2,3,4,10,11‐hexahydrocarbazoles (compounds 6–10) and of the 8‐methoxy derivatives 11–13 in hexane solution, with 254 nm light, in the presence of air, leads to 11‐methyl‐2,3,4,11‐tetrahydro‐1 H‐carbazole (2) (table 1) and its 8‐methoxy derivative 21, respectively (scheme 2). Furthermore the 8‐acylated products. 14, 15, 16, 18, are formed in minor amounts by a “photoanilide” rearrangement. Irradiation of the N‐acetyl‐8‐methoxy‐indoline 12 gives in addition (by elimination of the 8‐methoxy group) the 8‐acetyl‐indoline 14 and, by coupling, the dimeric compound 23 (schemes 2 and 4). Irradiation of the N‐formyl‐indoline 6 yields, besides the indolenine 2 the indoline 1 (table 1). The mechanism of the anaerobic part of these photoreactions were investigated by CIDNP experiments.It is possible to convert directly indoline 1 to the indolenine 2, in 33% yield, by irradiation at 60° in the presence of oxygen.
Structure of a boron‐free hydrolysis product from Boromycin
Authors: Marsh Wayne , Dunitz Jack D. , White David N. J. 
Published: December 2004

AbstractThe structure of des‐boron‐des‐valine‐boromycin C40H68O14 · H2O (DBDVB), the product obtained by hydrolysis of the antibiotic boromycin C45H74BNO15, has been determined by X‐ray analysis. The molecule is remarkably similar in constitution, configuration and even in conformation to those of boromycin and des‐valine‐boromycin determined previously [2], showing that the overall molecular shape is retained on removal of the spiro boron atom.
Über die absolute Konfiguration der Cantharsäure und des Palasonins
Authors: Peter Martin G. , Snatzke Günther , Snatzke Feliksa , Nagarajan K. N. , Schmid Hans 
Published: December 2004

AbstractThe absolute configurations of (+)‐cantharic acid, a chiral derivative of the achiral insect defensive substance cantharidin (1), and of palasonin, a lower homologue of 1 occurring in the plant Butea frondosa, were shown to be represented by formulas 2 and 3, respectively (scheme 1). These results were obtained by application of the Horeau method (table 1) on the (+)‐cantharic acid derivatives (+)‐5, (−)‐7, and (−) 11 (scheme 2), and the palasonin derivatives (+)‐29 and (+)‐30 (scheme 4), as well as by comparison of the chiroptical properties (tables 2 and 3) of a number of derivatives, prepared from either cantharic acid or palasonin. – Attempts to incorporate various radioactively labelled precursors into palasonin (3), using young and adult plants, have been so far unsuccessful.
Quantitative Bestimmung, Charakterisierung und Stabilität von Magnesium 5‐Methyltetrahydrofolat
Authors: Conti Josef , Suter Hans , Widler Rita 
Published: December 2004

AbstractDie Eigenschaften des Magnesiumsalzes der 5‐Methyltetrahydrofolsäure und eine spezifische Methode zu seiner quantitativen Bestimmung werden beschrieben. Die Stabilitäten der Na‐, Mg‐, Ca‐, Ba‐Salze werden vergleichend untersucht.
Synthese von (±) Seychellen
Authors: Fráter György 
Published: December 2004

AbstractA four step synthesis of Seychellene (1) is described. Intramolecular Diels‐Alder reaction of dienon 2 furnished the tricyclic ketones 3 and 4 in good yield. Hydrogenation of 3 gave 5 and 6. The higher reactivity of 6 with methyllithium compared to 5 allowed the selective preparation of 8, which, on subsequent acid‐catalyzed rearrangment afforded Seychellen in 57,5% yield. In an analogues manner epi‐Seychellene was synthetized via the intermediates 5 and 7.
The Thermochemical Kinetics of Retro “‐Ene” Reactions of Molecules with the General Structure (Allyl)XYH in the Gas Phase. 8.. The Thermal Decomposition of Methylallylaniline in the Gas Phase
Authors: Egger Kurt W. , Vitins Peter 
Published: December 2004

AbstractThe thermal decomposition of N‐methyl‐N‐allylaniline in the gas phase over the temperature range 575 to 665 K appears to be a homogeneous radical chain reaction yielding allyl and C6H5NCH3 radicals in the primary step as is indicated by the numerous chain‐terminating radical recombination products and the effect of diluents on the rate constants. From experiments carried out with excess of diluent, first order rate constants which can be identified with the rate determining chain initiating step, were calculated using the internal standard technique and found to fit the Arrhenius relationship \documentclass{article}\pagestyle{empty}\begin{document}$\ log({\rm k}/{\rm s}^{ - 1}) = 13.75 \pm 0.43 - (48.50 \pm 1.23\,{\rm kcal mol}^{{\rm - 1}})/2.303\,{\rm RT} $\end{document}. Although the Arrhenius parameters are slightly low, which is attributed to some loss of substrate by secondary reactions, they are in general agreement with prediction. The relevance of these results to the thermal behavior of allylamines and the nature of six‐center transition states is discussed.
Anil‐Synthese. 10. Mitteilung. Über die Darstellung von Styryl‐Derivaten des Dibenzofurans
Authors: Garmatter Jacques , Siegrist Adolf Emil 
Published: December 2004

AbstractSchiff'sche Basen des Dibenzofuran‐2‐ bzw. ‐3‐carbaldehydes mit p‐Chloranilin können mit p‐tolyl‐substituierten heterocyclischen und carbocyclischen Aromaten in Gegenwart von Dimethylformamid und Kaliumhydroxid bzw. Kalium‐t‐butylat in die entsprechenden Styryl‐Derivate übergeführt werden (« Anil‐Synthese »).Die Lage der Absorptions‐ und Fluoreszenz‐Maxima der dargestellten Grundkörper mit dem Dibenzofuran‐3‐yl‐Rest wird mit der analoger Verbindungen mit dem p‐Biphenylyl‐Rest verglichen.
8‐Oxabicyclo[5.1.0]octa‐2,4‐dien, reduktive und säurekatalysierte Ringöffnung
Authors: Schiess Peter , Wisson Markus 
Published: December 2004

Abstract8‐Oxabicyclo[5.1.0]octa‐2,4‐diene (1) is obtained from cycloheptatriene with commercial 40% peracetic acid. Upon catalytic and LiAlH4 reduction the allylic CO‐bond in 1 is cleaved. Acid catalised hydrolysis leads to a mixture of all six possible isomeric cycloheptadienediols. With BF3 in the absence of water isomerization to 3,5‐cycloptadienone is observed.
SN2 Reactions with Carboxylic Esters. Selective cleavage of methyl esters
Authors: Müller Paul , Siegfried Bernard 
Published: December 2004

AbstractSodium cyanide in hexamethylphosphoric triamide selectively cleaves methyl esters in the presence of ethyl esters with yields of ca. 80%. The mechanism of the reaction has been investigated. It consists of nucleophilic displacement by cyanide of the carboxylate ion from the alcohol carbon atom (BAl2 mechanism).
Photoelectron Spectroscopy of peri‐Amino Naphthalenes
Authors: Maier John P. 
Published: December 2004

AbstractThe He I photoelectron spectra of peri‐amino and dimethylamino naphthalenes are presented. The differences in the ionization energies of the π‐bands are interpreted by separation of the perturbation of the amino substituent into an inductive destabilization and conjugative stabilization. This affords the assignment of the photoelectron bands of ionization energies below 11 eV and an estimation of the dihedral angle in the peri‐dimethylamino derivatives. The data on the peri‐amino naphthalenes indicate some angular distortion in contrast to 2‐aminonaphthalene.
Ringschlüsse an Chinonylmethanfarbstoffen und analogen Merocyaninen. 1. Mitteilung. Substituierte Dihydro‐naphtho[1,2‐b]phenazinone als neuer Typ von “percyclischen” Merocyaninen
Authors: Schelz Dieter 
Published: December 2004

AbstractSubstituted dihydro‐naphtho[1,2‐b]phenazinone dyes of unexpected properties were synthesized by cyclization of the corresponding (1‐alkyl‐3‐methyl‐2‐quinoxalinylidenmethyl)‐naphtho‐quinones. The visible and H‐NMR. and some mass spectra of the dyes are discussed.
Crystal Structure of the Orthorhombic Modification of a Mononuclear Peroxotitanium(IV) Dipicolinate
Authors: Manohar H. , Schwarzenbach D. 
Published: December 2004

AbstractThe deep red diaquoperoxotitanium dipicolinate [TiO2(C7H3O4N) (H2O)2]2H2O crystallises in a pleochroic triclinic and a nonpleochroic orthorhombic modification. The structure of the former has been reported earlier. The structure of the latter, described in this paper, has been determined from X‐ray diffractometer data and refined to R = 0.034. In both forms the complex occurs as the free acid, but the modes of packing are completely different. Bond lengths and angles agree closely. As in the other peroxotitanium(IV) chelate structures so far determined, titanium has an approximately pentagonal bipyramidal coordination with the peroxo group and the chelate ligand occupying equatorial sites and the waters forming the apices. The relationship proposed earlier between the basicity of the ligands and the bond lengths and colours of the related compounds is substantiated. The final difference Fourier maps obtained with normal and modified refinement procedures clearly reveal bonding electron densities. They indicate a pentagonal bipyramidal sp3d3 hybridisation of titanium with bent Ti‐Operoxo bonds, again in agreement with the triclinic form and other peroxotitanium chelates.
Limitations of Affinity Chromatography: Solvolytic Detachment of Ligands from Polymeric Supports
Authors: Tesser Godefridus Ignatius , Fisch Hans‐Ulrich , Schwyzer Robert 
Published: December 2004

AbstractLigands of the RNH2 type which are covalently bound to agarose, cellulose, or cross‐linked dextranes by the conventional cyanogen bromide method are slowly detached from their supports by solvolytic processes occurring above pH 5 in aqueous surroundings. At pH values between 5 and 10, the free ligands, RNH2, appear in solution. Above about pH 10, the carbamyl derivative of the ligand, RNHCONH2, is the main product. Dilute ammonia releases iminocarbamyl derivatives, RNHC(NH)NH2. The latter type of compound has also been observed in tris(hydroxymethyl)‐aminomethane buffers at pH 8 and 9. Possible reaction mechanisms have been formulated on the basis of the structures suggested by Axén & Ernback for activated and substituted polysaccharides. Ligands attached to polyacrylamide gels (A) through amide bonds to carboxyl groups of the carrier, RNHCO·A, are released at slower rates and invariably as the free, unsubstituted ligand molecules. The release reaction appear to be general and independent of the particular ligand structure. We therefore advise caution with all experiments that can be adversely influenced by the presence of free ligands (e.g. localization of hormone receptors on the cell surface). At pH5, sepharose‐bound 8‐(ϵ‐aminocaproyl‐β‐aminoethylthio)‐adenosine‐3′, 5′‐cyclo‐monophosphate removes cyclic 3′, 5′‐adenosine‐monophosphate‐binding proteins from their solutions, but the corresponding polyacrylamide derivative does not (pH 7).