CS224984B1 - The production of l-talose - Google Patents
The production of l-talose Download PDFInfo
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- CS224984B1 CS224984B1 CS599682A CS599682A CS224984B1 CS 224984 B1 CS224984 B1 CS 224984B1 CS 599682 A CS599682 A CS 599682A CS 599682 A CS599682 A CS 599682A CS 224984 B1 CS224984 B1 CS 224984B1
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- talose
- toluidine
- tolyl
- talozylamine
- preparation
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Description
(54)(54)
Sposob přípravy L-talóxyPreparation of L-talkoxy
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Vynález sá týká sposobu přípravy L-talózy z reakčnej zmesi po nitrometanovej syntéze.The invention relates to a process for preparing L-talose from a reaction mixture after nitromethane synthesis.
L-talóza patří medzi ťažko dostupné aldohexózy. Bola připravená z tajLonolaktónu redukciou sodíkovou amalgámou ^C.Glatthaar, T.Reichstein: Helv.Chim.Acta. 21,1 /1938/^, ale výťažok bol nízký a L-talóza sa nezískala ako čistý kryštalický produkt, len ako sirup. L-talóza vzniká tiež z L-lyxózy a nitrometanu ^V.Bílik: Coll, Czech.Chem.Comm. 39, 1621 , pri tejto reakcii je hlavným produktomL-talose is among the hardly available aldohexoses. It was prepared from tajLolactone by sodium amalgam reduction. C.Glatthaar, T.Reichstein: Helv.Chim.Acta. 21.1 (1938), but the yield was low and L-talose was not obtained as a pure crystalline product, only as a syrup. L-talose is also formed from L-lyxose and nitromethane. 39, 1621, is the major product in this reaction
L-galaktóza od Ktorej sa L-talóza dá len ťažko a nedokonale oddělit'. Ani v tomto případe sa nezískala L-talóza kryštalická.L-galactose from which L-talcose is difficult to separate and incomplete. In this case too, L-talose was not crystalline.
Uvedené nevýhody v podstatnej miere odstraňuje sposob přípravy L-talózy podlá vynálezu, ktorého podstata spočívá v tom, že sa zó zmesi L-talózy a L-galaktózy pomocou p-tolu idinu izoluje kryštalický N-p-tolyl-L-talozylamin, ktorý sa rozloží hydrolýzou za súčasného oddestilovania p-toluidinu a vykrystalizuje sa z metanolu,·The above-mentioned disadvantages are substantially eliminated by the process for the preparation of L-talose according to the invention, which consists in isolating crystalline Np-tolyl-L-talozylamine from a mixture of L-talose and L-galactose by p-toluidine, which is decomposed by hydrolysis while p-toluidine is distilled off and crystallized from methanol,
Příklad 1Example 1
Příprava N-p-tolyl-L-talozylaminu. K roztoku,*ktorý obsahuje L-talózu /8 g/ a L-galaktózu /2 g/ v /25 ml/ vody sa přidá roztok p-toluidínu /6 g/ v 96 % etanole /25 ml/ a /0,5 ml/ 10 % kyselině octovéj. Vykrystalizuje N-p-tolyl—Ltalozalamín, ktorý sa odfiltruje a premyje /200 ml/ 50 % etanolu. Získá sa 11,0 až 11,5 g N-p-tolyl-L-talozylaminu. Teplota topenia 124° C čo zodpovedá 7,4 až 7,7 g volnéj Ltalózy.Preparation of N-p-tolyl-L-talozylamine. To a solution containing L-talcose (8 g) and L-galactose (2 g) in (25 ml) water was added a solution of p-toluidine (6 g) in 96% ethanol (25 ml) a (0.5) ml / 10% acetic acid. Crystallization of N-p-tolyl-eththaloslamine is filtered off and washed with (200 ml) 50% ethanol. 11.0-11.5 g of N-p-tolyl-L-talozylamine are obtained. Melting point 124 ° C, corresponding to 7.4 to 7.7 g of free Ltalose.
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Příprava kryštalickej L-talózy. N-p-tolyl-L-talozylamin /7,5 g/ sa suspenduje vo vodě /150 ml/ a zmes sa podrobí des tilácii s vodnou parou, aby sa odstranil p-toluidín. Získaný roztok L-talózy sa odfarbí /10 g/ aktívneho uhlia a zahustí na sirup, ktorý sa rozpustí v /40 ml/ metanolu. Vykryštalizu je 7,0 g chromatograficky čistej L-talózy^jj^^0 — 20,4°, Teplota topenia 130°C. Výťažok je 87,5 % z,množstva L-talózy prítomnej v póvodnej zmesi cukrov.Preparation of crystalline L-talose. Np-tolyl-L-talozylamine (7.5 g) was suspended in water (150 ml) and the mixture was subjected to steam distillation to remove p-toluidine. The L-talcose solution obtained is decolorized (10 g) with activated carbon and concentrated to a syrup which is dissolved in (40 ml) methanol. Crystallized is chromatographed 7.0 g of L-talose ^ jj ^^ 0 to 20.4 °, m.p. 130 ° C. The yield is 87.5% of the amount of L-talose present in the original sugar mixture.
Vynález má rozsiahle využitie ako modelová látka pri stádiu biochemických pochodov, ako aj v medicíně. L-talóza patří medzi vzácné a ťažko dostupné sacharidy.The invention has extensive application as a model substance in the stage of biochemical processes as well as in medicine. L-talose is a rare and hardly available carbohydrate.
Claims (1)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CS599682A CS224984B1 (en) | 1982-08-13 | 1982-08-13 | The production of l-talose |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CS599682A CS224984B1 (en) | 1982-08-13 | 1982-08-13 | The production of l-talose |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CS224984B1 true CS224984B1 (en) | 1984-02-13 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CS599682A CS224984B1 (en) | 1982-08-13 | 1982-08-13 | The production of l-talose |
Country Status (1)
| Country | Link |
|---|---|
| CS (1) | CS224984B1 (en) |
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1982
- 1982-08-13 CS CS599682A patent/CS224984B1/en unknown
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