摘要:

AbstractThe preparation of a number of 2,3‐dialkoxy‐ and 2,3‐diaryloxyquinoxalines is described in detail. Unlike many other substituted quinoxaline derivatives, these compounds appear to be relatively very stable towards potassium permanganate.It is demonstrated that the introduction of particular substituents into the benzene ring of these quinoxaline derivatives again produces starting materials for the preparation of pyrazine carboxylic

ISSN:0165-0513    

DOI:10.1002/recl.19590780102

出版商:WILEY‐VCH Verlag    

年代:1959

数据来源: WILEY

摘要:

AbstractThe synthesis is described of the four pairs of enantiomeric modifications ofThe stereochemical structures have been correlated with those oferythro‐ andthreo‐ephedrine.Conformation analysis has been used to explain the configuration of the amino‐alcohols f

ISSN:0165-0513    

DOI:10.1002/recl.19590780103

出版商:WILEY‐VCH Verlag    

年代:1959

数据来源: WILEY

摘要:

AbstractThe synthesis of the racemates of the alkaloids sedamine and sedridine, the separation of the racemates, and their resolution into optical antipodes are described, with the exception of the resolution of (±)‐allosedridine and so far as no earlier information about these subjects has been given by us.The results are compared with data about the natural products obtained fromSedum acreandLobelia infla

ISSN:0165-0513    

DOI:10.1002/recl.19590780104

出版商:WILEY‐VCH Verlag    

年代:1959

数据来源: WILEY

摘要:

AbstractIn the series of theiso‐propylp‐nitrophenyl alkylphosphonates the lower homologues have been prepared by interaction ofiso‐propyl alkylphosphonochloridates and sodiump‐nitrophenoxide. All thesep‐nitrophenyl derivatives are yellow liquids; boiling points and refractive indices are given, as well as an example of the infrare

ISSN:0165-0513    

DOI:10.1002/recl.19590780105

出版商:WILEY‐VCH Verlag    

年代:1959

数据来源: WILEY

摘要:

AbstractThe condensation products of rhodanine, 3‐ethylrhodanine and 3‐phenyl‐rhodanine with various polycyclic aromatic aldehydes have been prepared with a view to obtaining compounds with increased bacterial and fungicidal properties. The aldehydes were chosen to yield products of similar skeletal configuration to the less accessible alkyl substituted compounds. It is known that substituted benzylidene‐rhodanine derivatives show increased bacterial activity and the products obtained, by virtue of their structure, should show activity similar to di‐ and tetra‐alkyl substituted derivatives. Condensations were carried out in both ammoniacal and acid media and crystalline coloured condensation products were obtained in

ISSN:0165-0513    

DOI:10.1002/recl.19590780106

出版商:WILEY‐VCH Verlag    

年代:1959

数据来源: WILEY

摘要:

AbstractThe system Cu‐Ba was examined up to 75% Ba by weight. At 675° C there is a peritectic three‐phase equilibrium Cu + liquid ⇋ Cu13Ba. The compound Cu13Ba has KZn13structure. At 550° C there is a eutectic three‐phase equilibrium liquid ⇋ Cu13Ba + CuxBay. Composition and structure of the latter could not be determined owing to experimental d

ISSN:0165-0513    

DOI:10.1002/recl.19590780107

出版商:WILEY‐VCH Verlag    

年代:1959

数据来源: WILEY

摘要:

AbstractFrom ultracentrifugal and electrophoretical data it appears to be probable that solutions of α‐crystallin of the eye‐lens contain two subunits of equal molecular weight, differing in shape

ISSN:0165-0513    

DOI:10.1002/recl.19590780108

出版商:WILEY‐VCH Verlag    

年代:1959

数据来源: WILEY

ISSN:0165-0513    

DOI:10.1002/recl.19590780101

出版商:WILEY‐VCH Verlag    

年代:1959

数据来源: WILEY