摘要:

AbstractThe title compounds can be separated by liquid chromatography on a column of octadecylsilyl‐silica with the addition to the eluent ofn‐heptanesulfonate and identified by peak area measurements at different UV waveleng

ISSN:0165-0513    

DOI:10.1002/recl.19790981002

出版商:WILEY‐VCH Verlag    

年代:1979

数据来源: WILEY

摘要:

AbstractL'étude de la configurationEouZde formyl‐hydrazinoas‐triazines, établie par RMN et par le calcul théorique, permet de déterminer la structure tautomère de ces composés: de type tétrahydro‐2,3,4,5 triazine ou dihydro‐2,5 triazine selon la nature de

ISSN:0165-0513    

DOI:10.1002/recl.19790981003

出版商:WILEY‐VCH Verlag    

年代:1979

数据来源: WILEY

摘要:

AbstractThe zeolite‐catalyzed hydrobromination of 1‐alkenes was investigated. Contrary to literature data, normal (Markovnikov) addition of hydrogen bromide yielding 2‐bromoalkanes was observed if peroxide impurities were removed thoroughly from the reactants. Substantial amounts of 3‐ and 4‐bromoalkanes were formed due to zeolite‐catalyzed isomerization of

ISSN:0165-0513    

DOI:10.1002/recl.19790981004

出版商:WILEY‐VCH Verlag    

年代:1979

数据来源: WILEY

摘要:

Abstract3‐Alken‐1‐yn‐1‐amines R‐CH=CH‐C≡C‐NR′2, 9 (R = H, Me, R′ = alkyl) have been prepared in good yields by treatment of the Mannich products MeO‐CH(R)‐C≡C‐CH2‐NR′2‐ obtained from propargylic ethers MeO‐CH(R)‐C≡C‐H, paraformaldehyde and dialkylamines R′2NH ‐ w

ISSN:0165-0513    

DOI:10.1002/recl.19790981005

出版商:WILEY‐VCH Verlag    

年代:1979

数据来源: WILEY

摘要:

AbstractThe synthesis of (E,E)‐1,5‐cyclodienes is described. The preparation of these ring systems is accomplished by intramolecular coupling of (E,E)‐3,3′‐polymethylenebis(allyl bromides), with bis(1,5‐cyclooctadiene)nickel(0). In this way the fourteen, sixteen and eighteen ring can be prepared in good yield. Synthesis of the twelve ring in this manner fails and gives only cyclodimers and acyclic products.Synthesis of (E,E)‐1,5‐cyclododecadiene is accomplished by reduction of (E,E,E)‐1,5,9

ISSN:0165-0513    

DOI:10.1002/recl.19790981006

出版商:WILEY‐VCH Verlag    

年代:1979

数据来源: WILEY

摘要:

AbstractThe limited proteolysis of acetimidated ribonuclease A by subtilisin has been investigated. Evidence of the cleavage being restricted to the Ala20–Ser21bond is presented.N8ε‐acetimidyl‐S‐protein, an intermediate for the chemical semisynthesis of ribonuclease A analogues, can be obtained in an over‐all yield of 46% starting from ribonuclease A.A new method to follow the subtilisin‐catalyzed cleavage reaction of ribonuclease A and derivatives, applying reverse‐phase high‐performance liquid chromatogra

ISSN:0165-0513    

DOI:10.1002/recl.19790981007

出版商:WILEY‐VCH Verlag    

年代:1979

数据来源: WILEY

摘要:

AbstractReductive cleavage of 2H‐thiopyran1with naphthylsodium or sodium in THF or THF/HMPT mixtures, respectively, gives the di‐anion, which is protonated and methylated by the first equivalent of methyl iodide on the terminal carbon a

ISSN:0165-0513    

DOI:10.1002/recl.19790981008

出版商:WILEY‐VCH Verlag    

年代:1979

数据来源: WILEY

摘要:

AbstractThe rate of the selective oxidation of mercaptoethanol by dioxygen to disulphide, catalysed by Co(II)‐tetrasulphophthalocyanine, is enhanced with a factor 2 à 4 by irradiation with light in the range of 600‐700 nm. This effect can be ascribed to the conversion of dimers of Co(II)‐tetrasulphophthalocyanine to catalytically active mo

ISSN:0165-0513    

DOI:10.1002/recl.19790981009

出版商:WILEY‐VCH Verlag    

年代:1979

数据来源: WILEY

ISSN:0165-0513    

DOI:10.1002/recl.19790981001

出版商:WILEY‐VCH Verlag    

年代:1979

数据来源: WILEY