摘要:

AbstractThe crystal and molecular structures have been determined by single‐crystal X‐ray methods for the binuclear metal ions (II) complexes of 7‐azaindole (1H‐pyrrolo [2,3‐b] pyridine, C7H6N2denoted by HL), Cu2(CH3CO2)2.·L2(HL)2and Ni2L4.2DMF. The dark green crystal of Cu2(CH3CO2)2L2(HL)2was found to crystallize in the monoclinic space group P 21/n with a = 9.566(2), b = 12.752(2), c = 12.852(4) Å, β = 99.23(3)0, V = 1547 Å, Z = 2, the final R = 0.062 and Rw = 0.053 for 1488 observations from 2722 unique reflections. The Cu‐Cu distance is 2.747(2), Cu‐N (L−, bridge) is 1.966(7), Cu‐N (HL, axial) is 2.229(8), and Cu‐O is 2.031(6)Å. The red crystal of Ni2L4.2DMF was was found to crystallize in the triclinic space group\documentclass{article}\pagestyle{empty}\begin{document}$$ {\rm P \bar 1} $$\end{document}with a = 8.907(5), b = 9.462(2), c = 10.217(2) Å, α = 90.48(2), β = 91.09(3), γ = 110.69(3)0, V =805 Å3, Z = 1, the final R = 0.063 and Rw = 0.069 for 1489 observations from 2834 unique reflections. The Ni‐Ni distance is 2.594(2), Ni‐N is 1.905(7) Å. These two molecules lie on crystllographic inversion c

ISSN:0009-4536    

DOI:10.1002/jccs.198800049

出版商:WILEY‐VCH Verlag    

年代:1988

数据来源: WILEY

摘要:

AbstractThe conductance of NaClO4at (25–45)°C in methanol‐H2O, and glycerol‐H2O mixtures in a concentration range up to 10−2M has been measured. The association constant, KA, values have been determined, where the conductometric data were analysed by a M S X computer using the Fuoss‐Aprano method. The KAvalues for NaClO4in methanol‐H2O are higher than in glycerel‐H2O mixtures, Also KAvalues increase as the proportional of methanol or glycerol increases in mixture. The thermodynamic parameters ΔH°, ΔG°, and ΔS° were also calculated. It is obvious that the entire process of the ionic association in those systems are endothermic ones. The Walden products, Λoη were calculated for al

ISSN:0009-4536    

DOI:10.1002/jccs.198800050

出版商:WILEY‐VCH Verlag    

年代:1988

数据来源: WILEY

摘要:

AbstractIn‐situ electron spin resonance studies of polyaniline at various applied potentials in media of pH 0.49, 2.09, 3.96, anf 9 are reported. The g factor of the esr signal is 2.0036 and does not vary with the applied potential. The peak to peak linewidth decreases to a minimum in a potential range which depends on the pH of the medium. On the other hand, the spin density increases to a maximum in the same potential range. The pH‐potential range where the highly conductive form exists, matches very well the range of narrow linewidth and high spin density of the esr signal. The conductive form of polyaniline consists of highly mobile radical cations or polar

ISSN:0009-4536    

DOI:10.1002/jccs.198800051

出版商:WILEY‐VCH Verlag    

年代:1988

数据来源: WILEY

摘要:

AbstractCyclic voltammograms and morphology of polyaniline were studied under various synthetic conditions and in various protonic acid media. The effect of protonic acid is not remarkable. The cyclic voltammogram and morphology depend on the synthetic conditions. The anodic peak potential at 0.14 V versus SCE in the cyclic voltammogram is pH independent. The anodic peak potential at 0.7 V versus SCE (pH=1) is pH dependent. By comparing the range of pH and oxidation potential of the conductive form, we propose that the conductive species which exists in the potential range between the first and the second peak in cyclic voltammogram is the radical cation.

ISSN:0009-4536    

DOI:10.1002/jccs.198800052

出版商:WILEY‐VCH Verlag    

年代:1988

数据来源: WILEY

摘要:

AbstractThe mass spectra of a series of 6‐hydroxy‐3‐pyrones and their derivatives showed a marked dependence upon the nature of the substituent. The “retro‐Diels‐Alder” reaction is the primary decomposition observed for the parent compounds, while the α‐cleavage (substituent loss) competes with the “retro‐Diels‐Alder” reaction for their derivatives. An interpretation of this difference based on the charge location and the thermoc

ISSN:0009-4536    

DOI:10.1002/jccs.198800053

出版商:WILEY‐VCH Verlag    

年代:1988

数据来源: WILEY

摘要:

AbstractThe preparation of some new 3‐quinolinylchalcone derivatives was described. Their reaction with hydrazines, hydroxylamine hydrochloride, malononitrile and ethyl cyanoacetate gave the corresponding pyrazoline, isoxazoline, cyanopyridine and cyanopyridone derivatives, respectively. The biological activity of some of the products was evaluate

ISSN:0009-4536    

DOI:10.1002/jccs.198800054

出版商:WILEY‐VCH Verlag    

年代:1988

数据来源: WILEY

摘要:

AbstractThe dehydrobromination and debromination reactions of some α, β‐dibromosulfones in a five‐membered ring with sodium phenylthiolate, pyridine, and sodium methoxide have been studied. In general, phenylthiolate induces debromination elimination reactions while pyridine and methoxide induce dehydrobromination reac

ISSN:0009-4536    

DOI:10.1002/jccs.198800055

出版商:WILEY‐VCH Verlag    

年代:1988

数据来源: WILEY

摘要:

AbstractSubstituted 3‐(phenylthio)‐3‐sulfolenes (3) and (4) are good precursors for 2‐(phenylthio)‐1,3‐butadienes (5) and (6). The Diels‐Alder reaction of the dienes derived from (3) and (4) with various dienophiles was studied. It was found that heating of sulfolenes (3) with methyl propiolate and N‐phenylmaleimide afforded the Diels‐Alder adducts of (5) directly and with complete regio‐ and stereospecificity. The same reaction with methyl vinyl ketone gave a mixture of endo and exo addition products. If sulfolenes (3) were first converted to the dienes (5) using lithium aluminum hydride and then reacted with methyl vinyl ketone in the presence of anhydrous zinc chloride, the stereoselectivity could be improved. Sulfolenes (4) also underwent cycloreversion/cycloaddition with methyl acrylate, methyl vinyl ketone, and N‐phenylmaleimide, but gave mostly the double bond‐isomerized cycloaddition products. The regiochemistry of cycloaddition was delicately dependent

ISSN:0009-4536    

DOI:10.1002/jccs.198800056

出版商:WILEY‐VCH Verlag    

年代:1988

数据来源: WILEY

摘要:

AbstractA series of oxidized derivatives of 10‐deuterobenzol[a]pyrene (10‐D‐BaP) were synthesized. Oxidation of 10‐D‐BaP with sodium dichromate dihydrate yielded the 1,6‐, 3,6‐, and 6,12‐quinones of 10‐D‐Bap. Upon electrophilic aromatic substitution of 10‐D‐BaP with sodium nitrate, N‐bromosuccinimide, and N‐chlorosuccinimide we were afforded 6‐nitro‐10‐D‐BaP, 6‐bromo‐10‐D‐BaP, and 6‐chloro‐10‐D‐BaP, respectively, in high yields. The Vilsmier‐Haack reaction of 10‐D‐BaP provided 6‐formyl‐10‐D‐BaP which upon reduction with sodium borohydride, yielded 6‐hydroxymethyl‐10‐D‐BaP. Reduction with hydrazine in n‐amyl alcohol gave 6‐methyl‐10‐D‐BaP. Reduction of 6‐nitro‐10‐D‐BaP with hydrazine and Pd/C yielded 6‐amino‐10‐D‐BaP. The synthesized compounds, which are known metabolites of benzo[a]pyrene and are useful substrates for metabol

ISSN:0009-4536    

DOI:10.1002/jccs.198800057

出版商:WILEY‐VCH Verlag    

年代:1988

数据来源: WILEY

摘要:

AbstractReaction of the newly prepared 3‐(2‐thienyl)‐4‐amino‐s‐triazole‐5‐thione (I) with different alkyl kalides and aromatic aldehydes afforded the corresponding thioethers and arylidene derivatives (II and III), respectively. Attempt ring closure of (I) with acetic anhydride produced the unexpected triacetyl derivative (IV). The synthesis of certain 3‐(2‐thienyl)‐6‐substituted‐s‐triazolo[3,4‐b] 1,3,4‐thiadiazoles (V and VII) was described. IR, NMR and mass spectral analyses of the pr

ISSN:0009-4536    

DOI:10.1002/jccs.198800058

出版商:WILEY‐VCH Verlag    

年代:1988

数据来源: WILEY