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2,7-Anhydro-manno-2-heptulopyranose is a complex carbohydrate compound, specifically a heptulopyranose, which is a type of sugar with seven carbon atoms. This particular sugar is characterized by the absence of two hydroxyl groups (demonstrated by the "anhydro" prefix), which are typically present at the 2nd and 7th carbon positions in the molecule. The "manno" part of the name indicates that the sugar has a structure similar to mannose, a common monosaccharide. The compound is significant in the field of organic chemistry and biochemistry, particularly in the study of complex carbohydrates and their roles in biological systems. It is also of interest in the development of new drugs and materials due to its unique structure and potential reactivity.

7739-21-1

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7739-21-1 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 7739-21-1 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 7,7,3 and 9 respectively; the second part has 2 digits, 2 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 7739-21:
(6*7)+(5*7)+(4*3)+(3*9)+(2*2)+(1*1)=121
121 % 10 = 1
So 7739-21-1 is a valid CAS Registry Number.

7739-21-1Relevant academic research and scientific papers

Metal-mediated decarbonylation and dehydration of ketose sugars

Andrews, Mark A.

, p. 2703 - 2708 (2008/10/08)

Ketose sugars can be decarbonylated and/or dehydrated by the action of certain metal complexes. Fructose reacts with 1 equiv of RhCl(PPh3)3 (1) in N-methyl-2-pyrrolidinone (NMP) at 130°C to give furfuryl alcohol, Rh(CO)Cl(PPh3)2 (2), and a small amount of 1-deoxyerythritol. 1,3-Dihydroxyacetone consumes 2 equiv of 1, giving methane and ca. 2 mol of 2. With manno-2-heptulose the primary product is 2,7-anhydromanno-2-heptulopyranose. The mechanisms of these unusual reactions have been studied by using 13C-labeling experiments and model reactions employing Pd(II) and HCl. Attempts to make the reactions catalytic using [Rh(Ph2PCH2CH2CH2PPh 2)2]+[BF4]- in place of 1 were not successful. The use of NMP as a solvent offers some advantages in the acid-catalyzed synthesis of certain carbohydrate dehydration products, as exemplified by the conversion of manno-2-heptulose to its 2,7-anhydride and of 2-deoxyglucose to 1-(2-furanyl)-1,2-ethanediol.

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