Zobrazeno 1 - 10
of 53
pro vyhledávání: '"W. Brackman"'
Autor:
W. Brackman, H. C. Volger
Publikováno v:
Recueil des Travaux Chimiques des Pays-Bas. 84:1017-1034
The mechanism of the base-catalysed isomerization of the βγ-unsaturated ketones isomesityl oxide and Δ5-cholestenone to their αβ-unsaturated isomers was studied. The results are interpreted on the basis of a reaction scheme in which a dienolate
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::8ae49bb98d2d9bcfeed77c4f9c373312
https://doi.org/10.1002/recl.19650840807
https://doi.org/10.1002/recl.19650840807
Publikováno v:
Recueil des Travaux Chimiques des Pays-Bas. 84:1203-1229
Unsaturated (α,β- and β,γ-) aldehydes and ketones, capable of forming a conjugated dienol can be oxidized under mild reaction conditions in the presence of catalytic amounts of cupric-amine complexes in alkaline methanolic solution. Specific oxid
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::8ea1ca0666f834d781f979781a013104
https://doi.org/10.1002/recl.19650840913
https://doi.org/10.1002/recl.19650840913
Autor:
C. J. Gaasbeek, W. Brackman
Publikováno v:
Recueil des Travaux Chimiques des Pays-Bas. 85:242-256
Copper phenanthroline complexes are catalysts for the oxidation of methanol by oxygen at 30-45 °. A feature of the reaction is that it shows an induction period unless started with small amounts of H2O2 or cuprous ion. During the reaction the system
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::7fe4aa15adccd20634f678fec2b6d539
https://doi.org/10.1002/recl.19660850303
https://doi.org/10.1002/recl.19660850303
Autor:
W. Brackman, P. J. Smit
Publikováno v:
Recueil des Travaux Chimiques des Pays-Bas. 82:757-762
Nitriles can be obtained in good yields (60-80%) by treatment with oxygen at 30° of a methanolic solution of the corresponding aldehyde, containing ammonia, a strong base and a catalytically active copper complex. Yields are lower for base-sensitive
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::7d106a94e4b105d02f3b5eb9a293b3cb
https://doi.org/10.1002/recl.19630820803
https://doi.org/10.1002/recl.19630820803
Autor:
W. Brackman
Publikováno v:
Recueil des Travaux Chimiques des Pays-Bas. 68:147-159
The colour effects, which occur in the liquid phase in mixtures of quinones or nitro compounds on the one hand and unsaturated or aromatic compounds on the other, are attributed to complexresonance. By this is understood a covalent binding between tw
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::d9c7feb773636863df6b5bbc29063221
https://doi.org/10.1002/recl.19490680207
https://doi.org/10.1002/recl.19490680207
Autor:
W. Brackman, E. Havinga
Publikováno v:
Recueil des Travaux Chimiques des Pays-Bas. 74:1070-1080
In this paper the kinetics of the direct conversion of phenol into dimorpholino-orthobenzoquinone in systems containing phenol, morpholine, copper salt, oxygen and solvent, are described. The reaction only proceeds, if the phenol concentration exceed
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::2c6bcfab15d4f34f111a7e8d9cefe598
https://doi.org/10.1002/recl.19550740905
https://doi.org/10.1002/recl.19550740905
Autor:
W. Brackman, E. Havinga
Publikováno v:
Recueil des Travaux Chimiques des Pays-Bas. 74:937-955
In an attempt to imitate the action of the enzyme tyrosinase by means of simple homogeneous catalytic systems we have found some rapid reactions which convert monohydric phenols directly into amine-substituted orthoquinone derivatives. These reaction
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::169171563e13a0b2d9c2e7d3657bcdd0
https://doi.org/10.1002/recl.19550740803
https://doi.org/10.1002/recl.19550740803
Publikováno v:
Recueil des Travaux Chimiques des Pays-Bas. 85:437-445
Straight-chain aliphatic aldehydes of at least three carbon atoms can be catalytically in methanol solutions of copper-pyridine complexes and triethylamine by oxygen at 40 °C. In this oxidation the carbon atoms, starting with the carbon atom, are su
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::e6f83da930914544f58cfb60097d627f
https://doi.org/10.1002/recl.19660850503
https://doi.org/10.1002/recl.19660850503
Autor:
H. C. Volger, W. Brackman
Publikováno v:
Recueil des Travaux Chimiques des Pays-Bas. 84:1233-1242
The oxidation of 5-methyl-4-hexen-2-one and of isomesityl oxide by an equimolecular amount of cupric-pyridine complex in alkaline methanol yielded dehydrodimers via dienol radicals as intermediates. Oxidation of the radicals to carbonium ions does no
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::9f12c18fb4a4b98d9fe103d48615fae1
https://doi.org/10.1002/recl.19650840915
https://doi.org/10.1002/recl.19650840915
Autor:
P. J. Smit, W. Brackman
Publikováno v:
Recueil des Travaux Chimiques des Pays-Bas. 84:372-381
The copper-catalysed reaction of nitric oxide with diethylamine in alcoholic solvents at 30° and 1 atm yields nitrosamine as the sole nitrosation product. At lower reaction temperatures, e.g.−30° nitrosamine is formed only in low yields and alkyl
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::1b1acd9f8ad6411a296ebf22e8d45077
https://doi.org/10.1002/recl.19650840312
https://doi.org/10.1002/recl.19650840312