ISSN:0165-0513    

DOI:10.1002/recl.19640830602

出版商:WILEY‐VCH Verlag    

年代:1964

数据来源: WILEY

ISSN:0165-0513    

DOI:10.1002/recl.19640830603

出版商:WILEY‐VCH Verlag    

年代:1964

数据来源: WILEY

摘要:

AbstractThe series of the normal saturated fatty acids and their methyl esters with 5 to 20 carbon chain atoms was synthesized and careful purified, mainly by fractional distillation of the methyl esters in columns with up to 58 theoretical plates.The purity was checked with the aid of melting curves determined in a microcalorimeter and proved to be 96.6% or better.Refractive indices were determined and can be represented bywith an accuracy of 5 units in the fifth decimal place (c = number of carbon chain atoms).Densities, accurate to 1 unit in the fourth decimal place, can be represented byBoiling points can be given byb.pt. 20 mmfor the methyl esters (c>5), accurate to 0.1 °.From our data, combined with literature values, the molecular refractivity of the CH2group in an aliphatic chain calculated according toLorentz‐Lorenz.was determined at 4.64 at room temperature.In addition, melting and transition points, and heats of fusion and transition were determin

ISSN:0165-0513    

DOI:10.1002/recl.19640830604

出版商:WILEY‐VCH Verlag    

年代:1964

数据来源: WILEY

ISSN:0165-0513    

DOI:10.1002/recl.19640830605

出版商:WILEY‐VCH Verlag    

年代:1964

数据来源: WILEY

摘要:

AbstractCerebroside mixtures isolated from beef spinal cord lipids can be chromato‐graphically resolved into twelve or more components. The technique employed was multiple thin‐layer chromatography with a newly developed solvent. A fractionation of the cerebrosides could also be obtained by silicic acid column chromatography using chloroform‐methanol mixtures. The fractions were characterized (a) by thin‐layer chromatography; (b) by gas chromatography of the fatty acid methyl esters obtained after methanolysis of the cerebrosides. It could be shown that the chromatographic behaviour of cerebrosides is decisively influenced by the nature of their fatty acid co

ISSN:0165-0513    

DOI:10.1002/recl.19640830606

出版商:WILEY‐VCH Verlag    

年代:1964

数据来源: WILEY

摘要:

AbstractFrom impedance measurements it is shown that the hydrogen ion reduction on mercury behaves as a case of pure activation polarization between ‐1.1 and ‐1.3 V vs S.C.E. with 1‐α = 0.56 and ksh= 10−15cm · sec−1. The value of the double layer capacity in that potential range is reported. No influence of hydrogen on the double layer capacity could

ISSN:0165-0513    

DOI:10.1002/recl.19640830607

出版商:WILEY‐VCH Verlag    

年代:1964

数据来源: WILEY

摘要:

AbstractSecond harmonic polarograms in which, as predicted by theory, every reversible redox system gives rise to two peaks have been described in the literature1, 2, 3. In this paper the π radians phase difference between these two peaks is demonstrated, making use of the second harmonic content of the output of the oscillator driving the polarographic circuit. Anomalies in the case of the Tl(Hg)/Tl⊕‐ and the In(Hg)/In⊕⊕⊕‐electrode a

ISSN:0165-0513    

DOI:10.1002/recl.19640830608

出版商:WILEY‐VCH Verlag    

年代:1964

数据来源: WILEY

摘要:

AbstractThe alkaloid cryptopleurine (Va) is a phenanthroquinolizidine derivative which is physiologically active2–4but quite toxic5, even showing marked vesicant activity5, 6. As part of a program involving the synthesis of benzo‐quinolizidine analogs7–9as for testing as possible hypotensive agents (blood‐pressure lowering agents), we have prepared several simplified analogs of cryptopleurine. While the method used is a variant of that originally applied in the cryptopleurine synthesis10, the use of the more modern techniques involving the substitution of 2‐(1,3‐dioxolan‐2‐yl)pyridine11or picolinaldoxime12(II. Z = NOH) for picolinaldehyde (II. Z = O) has made possible in most cases the isolation of the intermediates III and IV. The phenanthro‐quinolizidines prepared (as salts) include the 2,3‐dimethoxy‐(Vb), the 6‐methoxy‐(Vc) a

ISSN:0165-0513    

DOI:10.1002/recl.19640830609

出版商:WILEY‐VCH Verlag    

年代:1964

数据来源: WILEY

摘要:

Abstract1,1,2,2‐Tetrakis(4‐hydroxy‐3,5‐dimethylphenyl)ethane has been prepared by the condensation of 2,6‐dimethylphenol with glyoxal. The tetraacetate has been isolated, after acetylation, from the product of the reaction between 2,6‐dimethylphenol and α,β‐dichlorovinyl phenyl ether and the tetramethyl ether has been obtained directly from 2,6‐dimethylanisole and glyoxal sulfate.Benzil and 2,6‐dimethylphenol can be condensed to give benzoyl‐4,4′‐dihydroxy‐3,3′,5,5′‐tetramethyltritane and there is evidence that the dimethyl ether of this compound is formed when 4‐methoxy‐3,5‐dimethylbenzophenone i

ISSN:0165-0513    

DOI:10.1002/recl.19640830610

出版商:WILEY‐VCH Verlag    

年代:1964

数据来源: WILEY

ISSN:0165-0513    

DOI:10.1002/recl.19640830611

出版商:WILEY‐VCH Verlag    

年代:1964

数据来源: WILEY