摘要:

AbstractThirteen low molecular weight oximes were prepared: one derivative of acetophenone (1), two derivatives of benzophenone (2and3), two derivatives of salicylaldehyde containing two phenolic nuclei (4cand5c), and eight compounds in which a phenol unit is substituted by a 4‐hydroxyiminomethylpyridiniummethyl group (8a–f, 10c, and11c). Besides these compounds polymeric phenol formaldehyde condensates were synthesized which contain units deriving from benzophenoneoxime (15b) or from salicylaldehyde (22b) and condensates containing 4‐hydroxyiminomethylpyridiniummethyl groups (23c). A series of low molecular weight and water soluble compounds (8a–f) were proved as antidotes on mice which were poisoned by paraoxon, sarin, soman, or tabun. These compounds showed a distinct but only a little antidote activity in the case of soman and tabun. Adsorption studies of parathion‐methyl in a solution of water and methanol (volume ratio 10:1) by the water insoluble polycondensates showed that the oximes adsorb better than the parent carbonyl

ISSN:0025-116X    

DOI:10.1002/macp.1979.021800701

出版商:Hüthig&Wepf Verlag    

年代:1979

数据来源: WILEY

摘要:

AbstractPhenyl(3‐vinylphenylazo)sulfide (2)—displaying not only the properties of an initiator (thermolysis) and a monomer (vinyl group) but also of a chain transfer agent (sulfenyl group)–was copolymerized with styrene in emulsion at 40°C and in bulk at 50°C. Terpolymerization with styrene and butadiene at 5°C in emulsion led to azo‐containing unsaturated polymers, which could be used for self cr

ISSN:0025-116X    

DOI:10.1002/macp.1979.021800702

出版商:Hüthig&Wepf Verlag    

年代:1979

数据来源: WILEY

摘要:

AbstractPolymerizations of 1‐naphthyl methacrylate and 2‐naphthyl methacrylate in acetone and in acetonitrile were carried out in the presence of 2,2′‐azoisobutyronitrile at 55 and 60°C, respectively. The polymers precipitate during the polymerization. Poly(1‐naphthyl methacrylate)s are partly soluble in common organic solvents. The polymerization medium does not influence noticeably the intrinsic viscosity of the resulting polymers. The tacticity was determined by1H NMR analysis after conversion of the poly(naphthyl methacrylate)s into poly(methyl methacrylate)s. Poly(naphthyl methacrylate)s obtained in acetone and acetonitrile have a higher content of isotactic triads than those obtained in solvents with low dielectric constants. The observed results correlate with the changes in the1H NMR spectra of the monomers depending on the dielectric constants of th

ISSN:0025-116X    

DOI:10.1002/macp.1979.021800703

出版商:Hüthig&Wepf Verlag    

年代:1979

数据来源: WILEY

摘要:

AbstractThe chemical synthesis of the undecanucleoside decaphosphate d(A‐T‐T‐A‐A‐C‐C‐T‐C‐C‐T) is described. With the exception of the mutated nucleobase (marked by the asterisk), this fragment is complementry to a segment of the plus‐strand of DNA from the Phage ΦX 174. The “point‐mutated” DNA‐fragment is chemically synthesized in five condensation steps from the protected mononucleotides dpbzA(Ac), dpT(Ac), the dinucleoside phosphate d(MeOTr)bzA‐T, and the trinucleotide dpanC

ISSN:0025-116X    

DOI:10.1002/macp.1979.021800704

出版商:Hüthig&Wepf Verlag    

年代:1979

数据来源: WILEY

摘要:

AbstractTwo kinds of coordination polymers were prepared from 2,3,6,7‐octanetetraone tetraoxime (1) and cupric acetate or bis(benzonitrile)palladium dichloride. The average molecular weigh of the Pd(II) chelate of1was found to be about 700–2500. The Cu(1) chelate of1, obtained by treating the Cu(I) chelate of1with hydrazine hydrate in methanol under nitrogen, can reversibly take up and release molecular oxygen and carbon monoxide. The Pd(II) chelate of1can also reversibly take up carbon monoxide, but in lower yi

ISSN:0025-116X    

DOI:10.1002/macp.1979.021800705

出版商:Hüthig&Wepf Verlag    

年代:1979

数据来源: WILEY

摘要:

AbstractThe pressure effect on the rate of maleic anhydride copolymerisations with various substituted ethylenes was found to be considerable, leading to high negative values of the activation volume, especially when the comonomer is crowded with bulky substituents. No significant variation of the polymer composition was observed and the reactivity ratios were found to be less affected by pressure than rates and generally decrease slightly with increasing pressure. Pressure influences also thee‐value of the monomer

ISSN:0025-116X    

DOI:10.1002/macp.1979.021800706

出版商:Hüthig&Wepf Verlag    

年代:1979

数据来源: WILEY

摘要:

AbstractThe kinetics of precondensation of ethylene glycol with the dicarboxylic acids: oxalic, malonic, succinic, glutaric, adipic, and pimelic acid was investigated.The course of the reaction was followed by weighing the reaction water. The final rate equation was found to be of 6th order. This is explained by assuming that only free–OH and COOH groups are capable of the condensation reaction, their number being given by an association equilibrium. These effects are reflected by alternating numerical values of reaction enthalpies and entropies. The idea of an association is stressed by IR‐spectroscopic measure

ISSN:0025-116X    

DOI:10.1002/macp.1979.021800707

出版商:Hüthig&Wepf Verlag    

年代:1979

数据来源: WILEY

摘要:

AbstractH‐D,L‐Ala‐D,L‐Ala‐OH (3) synthesized from Boc‐D,L‐Ala‐OH and H‐D,L‐Ala‐OMe by means of ethyl 2‐ethoxy‐1,2‐dihydroquinoline‐1‐carboxylate was shown by15N NMR spectroscopy to be a mixture of the L‐L and D‐D enantiomers. Using this racemic mixtureN‐(6‐isothiocyanatohexanoyl)‐D,L‐Ala‐D,L‐Ala‐OH (1a) was synthesized and then polymerized inN,N′‐dimethylformamide at 120°C. The15N NMR and13C NMR spectra of the resulting polymer (ε‐Aca‐D,L‐Ala‐D,L‐Ala)n(2) demonstrate that the polymerization involved to a large extent racemization. The15N NMR spectra taken in various solvents turned out to be ca. 5 times more sensitive to stereoisomerism than13C NMR spectra. The solvents were found to ha

ISSN:0025-116X    

DOI:10.1002/macp.1979.021800708

出版商:Hüthig&Wepf Verlag    

年代:1979

数据来源: WILEY

摘要:

AbstractD,L‐Alanine‐NCA containing 1,5%15N andD,L‐Valine‐NCA containing 2,4%15N, were synthesized and polymerized under various conditions. 36,48 MHz15N NMR spectra of the resulting poly(D,L‐amino acid)s were measured in trifluoroacetic acid, and the peak for the isotactic triad in each polymer was assigned by comparison with other alanine‐ and valine containing polypeptides. In the case ofD,L‐alanine‐NCA the formation of isotactic blocks was favored, when the “activated monomer mechanism” was operating. In the case ofD,L‐valine‐NCA, however, syndiotactic blocks were predominantly formed under the same reaction conditions. The initiation with primary amines results in almost atactic sequences. A helical secondary structure of the growing peptide chain is found to be an unnecessary condition for the stereospecificity of a NCA polymerization. The synthesis of Boc‐D,L‐Ala‐D,L‐Ala‐OMe fromtert‐butoxycarbonyl‐D,L‐alanine andD,L‐alanine methyl ester was carried out under various conditions, and the stereospecifity was investigated by means of natural abundance15N NMR spectra. The results are discussed with respect to the polymeriz

ISSN:0025-116X    

DOI:10.1002/macp.1979.021800709

出版商:Hüthig&Wepf Verlag    

年代:1979

数据来源: WILEY

摘要:

AbstractThe short‐wave (λ = 254 nm) photochemistry of poly(p‐aminostyrene) (PPAS), and poly(p‐nitrostyrene) (PPNS) films was studied under high vacuum conditions (≈ 10−6mbar) at 25°C. The principal reaction product in both cases was hydrogen, but both polymers also underwent coloration, crosslinking, and chain scission. Rates of chain scission and hydrogen formation were found to be considerably greater for PPAS, and these was attributed to the stabilizing effect of thep‐amino group (relative to that of thep‐nitro group) on the intermediate free radicals. The very high rate of crosslinking of PPAS would suggest the participation of thep‐amino group in cross

ISSN:0025-116X    

DOI:10.1002/macp.1979.021800710

出版商:Hüthig&Wepf Verlag    

年代:1979

数据来源: WILEY