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252057-02-6

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252057-02-6 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 252057-02-6 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,5,2,0,5 and 7 respectively; the second part has 2 digits, 0 and 2 respectively.
Calculate Digit Verification of CAS Registry Number 252057-02:
(8*2)+(7*5)+(6*2)+(5*0)+(4*5)+(3*7)+(2*0)+(1*2)=106
106 % 10 = 6
So 252057-02-6 is a valid CAS Registry Number.

252057-02-6Relevant articles and documents

Temperature dependence of the distribution of trityl groups in the tritylation of 1,2-O-isopropylidene-α-D-glucofuranose

Morishima, Naohiko,Mori, Yoko

, p. 1481 - 1483 (2007/10/03)

The tritylation reaction of 1,2-O-isopropylidene-α-D-glucofuranose with 2.4 molar amounts of trityl chloride in pyridine at 70 °C for 20 h gave the 5,6-di-O-trityl derivative in 50% yield as the major product, whereas the reaction at 115 °C mainly gave the 3,6-di-O-trityl derivative (26% yield) along with the 6-O-trityl derivative (48% yield). The fact that the yield of the 5,6-di-O-trityl derivative at 115 °C decreased after 1 h and was 12% at 20 h is due to the redistribution of trityl groups including detritylation assisted by pyridinium chloride. It was found that tritylation of the primary hydroxyl group at C-6 was almost completed within 10 min at 115 °C.

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