摘要:

AbstractIn an automatic hydrochlorinator, twenty‐four aromatic compounds including halogen and methoxy substituted compounds were complexed with hydrogen chloride and aluminum chloride. Relative basicities of these compounds to toluene were measured. Except those methoxy substituted compounds and few weakly basic compounds, the relative basicities of nineteen compounds were found to correlate linearly with the summation of σ+constants. Thus, this technique provide a simple approach to the analysis of aromatic basicity.While hexamethylbenzene was found to be 15 × 100time more basic than was toluene, benzene was found to be only FIVE time less basic than was toluene. From the rate of chlorination, benzene was estimated to be 1300 time less basic than was toluene according to the literature report.Moreover, the resultant complexes are composed of three types of structures. In the weakly basic region, a π‐complex is proposed. In the medium basic range, the σ‐complex is attributed to. the formation of a dimeric aluminum chloride‐hydrogen chloride complex. In the strongly basic region, the aromatic compound complexes with a monomeric aluminum chloride‐hydrogen chloride to form a sta

ISSN:0009-4536    

DOI:10.1002/jccs.197800020

出版商:WILEY‐VCH Verlag    

年代:1978

数据来源: WILEY

摘要:

AbstractThe determination of trace iron(II) is usually interfered by the presence of iron(III) when ortho‐phenanthroline colorimetric method is used. In this report a chromogenic reagent which contains ortho‐phenanthroline‐EDTA mixture has been developed to decrease the interference of ferric ion after adjusting the acidity of sample at 0.1Nby adding the sulfuric acid.The procedure is also simplified by introducing sulfamate buffer solution (pH= 1.5) without adjusting the acidity of sample with sulfuric acid. If iron(III) is not present in the sample, this method is also applicable. The comparative results are exhibited for the present method and the conventional o‐phenanthroline

ISSN:0009-4536    

DOI:10.1002/jccs.197800021

出版商:WILEY‐VCH Verlag    

年代:1978

数据来源: WILEY

摘要:

AbstractThe UV light irradiation of isoniazid (I) in methanol four products, isonicotinic acid (II), isonicotinamide (III), N, N′‐bis(isonicotinic acid)hydrazide (IV) and isonicotinaldehyde isonicotinyl hydrazone (V), in ethanol three products, (III), (IV) and acetaldehyde isonicotinyl hydrazone (VI) were isolated and identified. Also, the photoreaction mechanism of isoniazid in methanol and ethanol were discus

ISSN:0009-4536    

DOI:10.1002/jccs.197800022

出版商:WILEY‐VCH Verlag    

年代:1978

数据来源: WILEY

摘要:

AbstractThe reaction of 4‐methylpyridine and its methiodide withp‐N, N‐dimethylamino‐benzaldehyde gave 4‐p‐N, N‐dimethylaminostyrylpyridine (I) and 4‐p‐N, N‐dimethylaminostyrylpyridine methiodide (II), respectively, II was also prepared by methylation of I with methyl iodide in methanol. The pyridylidene structure of II,N‐benzyl‐4‐(p‐N, N‐dimethylaminophenyl) pyridinium chloride (IVa) and its methiodide (Va) was discussed in term

ISSN:0009-4536    

DOI:10.1002/jccs.197800023

出版商:WILEY‐VCH Verlag    

年代:1978

数据来源: WILEY

摘要:

AbstractUnder the irradiation of the ultraviolet light, Isoeugenol (I) undergoes dimerization in acetone to give diisoeugenol (II) and dehydrodiisoeugenol (III). The structures are determined by the comparison of the mixed m. p., I. R. spectra and T. L. C. with synthesized authentic samples. Also the photoreaction mechanism is discussed in detail. The reaction represents a new type and as an exception of photochemical process for the C=C double bond in conjugation with aromatic ring that generally dimerizes to produce cyclobutane type derivatives.

ISSN:0009-4536    

DOI:10.1002/jccs.197800024

出版商:WILEY‐VCH Verlag    

年代:1978

数据来源: WILEY

摘要:

AbstractCysteine hydrochloride was prepared by electroreduction of cystine with stainless steel plate as electrodes. 0.25Mof cystine in 1.5NHC1 as cathode solution was divided by anion‐exchange membrane from anode solution (1.5NHC1). A current of 5.6 A/S was applied and at the end of reaction, crysteine hydrochloride was obtained by evaporation of the cathode solution. The method is more convenient than the existing metho

ISSN:0009-4536    

DOI:10.1002/jccs.197800025

出版商:WILEY‐VCH Verlag    

年代:1978

数据来源: WILEY

摘要:

AbstractA polystyrenesulfonic acid resin in the hydrogen form is a useful stationary phase for chromatographic separation of adenine, caffeine, theobromine, theophylline, tannic acid, xanthine and tea components with aqueous ethanol as eluent. The results indicated that caffeine, theophylline, theobromine, adenine, xanthine and tannic acid could be separated on a column of Dowex‐50W‐X8(H)+by elution with 25% ethanol as elu

ISSN:0009-4536    

DOI:10.1002/jccs.197800026

出版商:WILEY‐VCH Verlag    

年代:1978

数据来源: WILEY

摘要:

AbstractSix new complexes of thallium(III) of the formula (π‐D)2Tl(L) (where D= cyclopentadienyl or indenyl group and L=nitro, nitrito or nitrato group) have been prepared and characterised on the basis of I. R. studies and some thermal properties of these complex

ISSN:0009-4536    

DOI:10.1002/jccs.197800027

出版商:WILEY‐VCH Verlag    

年代:1978

数据来源: WILEY

ISSN:0009-4536    

DOI:10.1002/jccs.197800028

出版商:WILEY‐VCH Verlag    

年代:1978

数据来源: WILEY