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Details van artikel 69 van 178 gevonden artikelen
| Titel: |
Formose Reactions. XXXII. Synthesis of Dl-2-C-Hydroxymethyl-3-Pentulose from Formaldehyde in N,N-Dimethylformamide-Water Mixed Solvent (II) |
| Auteur: |
Shigemasa, Yoshihiro Ueda, Takaaki Sashiwa, Hitoshi Saimoto, Hiroyuki |
| Verschenen in: |
Journal of carbohydrate chemistry |
| Paginering: | Jaargang 10 (1991) nr. 4 pagina's 607-618 |
| Jaar: |
1991 |
| Inhoud: |
The carbon number of the main product and the total yield of products increased with an increase in the amount of triethylamine (TEA). Furthermore, the decrease of DL-2-C-hydroxymethyl-3-pentulose (2-H-3-P) was speeded up by increasing the TEA concentration and 2,4-bis(hydroxy-methyl)-3-pentulose (2,4-BH-3-P) increased smoothly along with the progress of the reaction. In the low formaldehyde (HCHO) concentration range (ca. 0.5 M), dihydroxyacetone (DHA) and DL-glycero-tetrulose were main products. 2-H-3-P and 2,4-BH-3-P increased with an increase in the formaldehyde concentration. Dihydroxyacetone, DL-glycero-tetrulose, 2-H-3-P and 2,4-BH-3-P were favorably obtained from a formose reaction by choosing a suitable [thiamine. HCl]/[HCHO] ratio. Under the reaction conditions reported in this paper, thiamine decomposed rapidly and lost its catalytic ability. |
| Uitgever: |
Taylor & Francis |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
Details van artikel 69 van 178 gevonden artikelen
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