## Abstract Starting with 5‐formyl‐6,7‐dimethyl‐5,6,7,8‐tetrahydropterine (II), a new synthesis of 5,6,7‐trimethyl‐5,6,7,8‐tetrahydropterine (III) is described. Thereby the chemical behaviour of the 5‐formyl group in II is investigated, in order to enable the unequivocal differentiation between for
Über Pterinchemie. 57. Mitteilung. Zur Konfiguration und Konformation von 6,7-Dimethyl-und 5,6,7-Trimethyl-5,6,7,8-tetrahydropterin
✍ Scribed by Rudolf Weber; Max Viscontini
- Publisher
- John Wiley and Sons
- Year
- 1976
- Tongue
- German
- Weight
- 224 KB
- Volume
- 59
- Category
- Article
- ISSN
- 0018-019X
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✦ Synopsis
Configuration and conformation of 6,7‐Dimethyl‐ and 5,6,7‐Trimethyl‐5,6,7,8‐tetrahydropterines.
During the hydrogenation of 6,7‐dimethylpterine, cis‐6,7‐dimethyl‐tetrahydropterine is formed. A possible conformation for this substance and for the 5,6,7‐trimethyl derivative, which is obtained from it, is discussed, taking the ^1^H‐NMR. spectra of both tetrahydropterines into consideration.
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**The crystal structure of 5‐formyl‐6,7‐dimethyl‐5,6,7,8‐tetrahydropterine** The crystal structure of the title compound, a tetrahydropterine, has been determined by X‐ray analysis (direct method) and refined with 1579 structure amplitudes to R = 0.054. The crystal system is triclinic, space group
## Abstract The ^13^C‐NMR.‐spectra of 7,8‐dihydropterines and 5,6,7,8‐tetrahydropterines show a large difference in the chemical shifts of the 4a‐ and 8a‐sp^2^‐carbon atoms. From the CNDO calculations it is apparent that there is a considerable difference in electron density at C(4a) and C(8a) atom
**The crystal structure of 5,6,7‐trimethyl‐5,6,7,8‐tetrahydropterine‐dihydrochloride‐monohydrate** The crystal structure of the title compound has been determined by X‐ray analysis (direct methods) and refined with 947 structure amplitudes to R = 0.026. The crystal system is orthorhombic, space gro
## Abstract Zur Herstellung von 6‐Aminomethyl‐6,7‐dimethyl‐5,6,7,8‐tetrahydropterin wurde das durch Blausäureaddition an 6,7‐Dimethyl‐7,8‐dihydropterin entstandene 6‐Cyano‐6,7‐dimethyl‐5,6,7,8‐tetrahydropterin acetyliert, reduziert und anschliessend desacetyliert. Wie das 6‐Aminomethyl‐6‐methyl‐5,6
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