Zobrazeno 1 - 10
of 96
pro vyhledávání: '"R. Nasielski-Hinkens"'
Autor:
R. Nasielski-Hinkens, J. De Lannoy
Publikováno v:
Bulletin des Sociétés Chimiques Belges. 81:587-594
2-Amino-4-mercapto-s-triazine (IV), an analog of cytosine, has been prepared from cyanuric chloride by a three steps synthesis and by cyclisation of guanylthiourea with ethyl formate. The mass spectra of compounds III, IV and V have been investigated
Publikováno v:
Bulletin des Sociétés Chimiques Belges. 74:119-128
Substituted pyridazines, pyrimidines and s‐triazines yield very simple N.M.R. spectra. Substituent effects of electron releasing groups are enhanced in these heterocycles, and surprisingly large shifts occur at the meta positions. The J4–5 in 3,6
Publikováno v:
Bulletin des Sociétés Chimiques Belges. 82:371-382
The reaction of p‐toluenesulfonyl chloride with a few alkyl substituted 4‐hydroxypyrimidines (1a through 1d) yields the corresponding 4‐p‐toluenesulfonyloxypyrimidines (2a through 2d). The structure of the products is based on IR and NMR data
Publikováno v:
Bulletin des Sociétés Chimiques Belges. 79:329-336
The Birch reduction of chloro‐pyrimidine, ‐pyridazine and ‐s‐triazine derivatives bearing a prototropic substituent gives the corresponding dehalogenated compounds in good yields. Methylthio‐ and ethylthio‐substituents undergo a reductive
Publikováno v:
Bulletin des Sociétés Chimiques Belges. 98:375-386
Summary. New podands, based on 1,4,5,8‐tetra‐azaphenanthrene, have been synthesized from 2‐chloro‐1,4,5,8‐tetra‐azaphenanthrene 3; when the anchoring group is a nitrogen atom, the corresponding podands are, however, unstable. When reacted
Publikováno v:
Bulletin des Sociétés Chimiques Belges. 97:743-750
Reacting 2,2-dichlorododecanal with 1,2-diamino-4-nitrobenzene in dioxane in the presence of a base gives a 46% yield of 2-decyl-6-nitroquinoxaline, which after amination by hydroxylamine and reduction gave 5,6-diamino-2-decylquinoxaline. This diamin
Publikováno v:
Bulletin des Sociétés Chimiques Belges. 101:491-496
5‐Chloro‐6‐nitroquinoxaline 2, made in six steps from 2,3‐dichloronitro‐benzene, reacts 1) with piperidine to give 6‐nitro‐5‐piperidinoquinoxaline as the only product; 2) with methoxide to give a 95:5 ratio of 5‐methoxy‐6‐nitro
Publikováno v:
Bulletin des Sociétés Chimiques Belges. 99:783-788
2,3-Diphenylquinoxaline-N-oxide 1 with thionyl chloride gives only 5-chloro- and 6-chloro-quinoxaline and very little deoxygenation. Phenazine-N5-oxide 2, in the same conditions, gives mainly 2-chlorophenazine and minor amounts of 1-chlorophenazine,
Publikováno v:
Bulletin des Sociétés Chimiques Belges. 97:919-926
Piperidine, cyclohexylamine, methoxide ion and para‐thiocresolate ion react with 2‐chloro‐3‐nitroquinoxaline 1 by selectively substituting the nitro group, in contrast to the behavior of most ortho‐chloronitroaromatics which loose halide wh
Publikováno v:
Bulletin des Sociétés Chimiques Belges. 93:953-960
1,4,5,8‐Tetraazaphenanthrene‐N1‐oxide (II) reacts with POCl3 to give equivalent amounts of 2‐chloro‐tetraazaphenanthrene (V) and 9‐chloro‐tetraazaphenanthrene (VI). Benzo [f] quinoxaline‐N1‐oxide (IV) gives with the same reagent 2