Zobrazeno 1 - 10
of 28
pro vyhledávání: '"M. A. Hoefnagel"'
Autor:
J. van Westrenen, Joop A. Peters, M. A. Hoefnagel, J. Van Haveren, H. van Bekkum, F. J. Alblas
Publikováno v:
Recueil des Travaux Chimiques des Pays-Bas. 109:474-478
The N-alkylation of aminopolyols and amino acids by a Michael-type addition with maleate or fumarate in aqueous medium occurs readily at 90°C. Maleate reacts faster than fumarate by virtue of the higher free energy of the ground state. For a series
Publikováno v:
Recueil des Travaux Chimiques des Pays-Bas. 79:605-609
O,N,N-tribenzyl-glycerol-α-kephalins have been obtained in two diastereoisomeric forms. Upon hydrogenolysis the two isomers give the same kephalin. This diastereoisomerism, due to the presence of an asymmetric carbon atom and an asymmetric phosphoru
Publikováno v:
Recueil des Travaux Chimiques des Pays-Bas. 88:1110-1114
By alkylation of benzene with t-butyl chloride in the presence of aluminium chloride, 1,4-di- and 1,3,5-tri-t-butylbenzene can be prepared in a simple manner. Several polyalkylbenzenes with one or more t-butyl groups have been made readily accessible
Publikováno v:
Recueil des Travaux Chimiques des Pays-Bas. 81:461-464
Publikováno v:
Recueil des Travaux Chimiques des Pays-Bas. 88:562-572
The basic strengths of trans-azobenzene and its 2-methyl and 2,2′-dimethyl derivatives strongly favour the “classic” view that protonation of these compounds takes place with formation of an NH σ-bond. This is further confirmed by the rates of
Publikováno v:
Recueil des Travaux Chimiques des Pays-Bas. 77:491-530
Following up earlier work, this paper discusses the influence of 2-methyl-6-tert.butyl substitution and/or 2,6-di-tert.butyl substitution on certain properties of compounds such as nitrobenzene, aniline, N-methylaniline, N,N-dimethylaniline, acetanil
Publikováno v:
Recueil des Travaux Chimiques des Pays-Bas. 81:57-68
Heating of a monoacid diacylglycerol-α-iodohydrin or diacylglycerol-β-iodohydrin with silver nitrite or silver nitrate in a mixture of alcohol and water leads to an (equilibrium) mixture of the corresponding αβ-and αγ-diglycerides. Preparation
Publikováno v:
Recueil des Travaux Chimiques des Pays-Bas. 83:291-294
We describe the preparation of tris(2-stearoyloxyethyl) phosphate, starting from monostearoylglycol (2-stearoyloxyethanol) and phosphorus oxychloride and from silver bis(2-stearoyloxyethyl) phosphate and stearoylglycol iodohydrin. The alkaline hydrol
Publikováno v:
Recueil des Travaux Chimiques des Pays-Bas. 82:349-354
It was already known that monoacylglycols can be obtained readily and in very good yields by boiling a solution of the corresponding acylglycol-iodohydrin and an appropriate silver salt (nitrite or nitrate) in a mixture of ethanol and water. We have
Publikováno v:
Recueil des Travaux Chimiques des Pays-Bas. 79:330-341
A new synthesis of glycerol-α-kephalins and glycolkephalins is described. The corresponding silver benzyl diacylglycerol-α-phosphate or silver benzyl glycolphosphate is boiled in benzene solution with 2-(dibenzylamino)ethyl bromide, and the O,N,N-t