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55169-72-7

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55169-72-7 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 55169-72-7 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 5,5,1,6 and 9 respectively; the second part has 2 digits, 7 and 2 respectively.
Calculate Digit Verification of CAS Registry Number 55169-72:
(7*5)+(6*5)+(5*1)+(4*6)+(3*9)+(2*7)+(1*2)=137
137 % 10 = 7
So 55169-72-7 is a valid CAS Registry Number.

55169-72-7Relevant articles and documents

MECHANISM OF METHYLATION OF NUCLEOSIDE SUGAR HYDROXYL GROUPS BY DIAZOMETHANE IN THE PRESENCE OF STANNOUS CHLORIDE

Dudycz, Lech,Kotlicki, Andrzej,Shugar, David

, p. 31 - 38 (2007/10/02)

Diazomethane rapidly reacts with SnCl2 in methanol to give MeCl and Sn(OMe)2, both of which were isolated and identified.This reaction is the initial step in the apparent SnCl2*2H2O-catalysed methylation of nucleoside by diazomethane.The actual catalyst, Sn(OMe)2, readily reacts with Broensted acids, with exchange of ligands.For ribofuranosyl nucleusides, Sn2+ binds to site(s) having a labile proton, the effect being particulary predominant with 5- and 6-membered cyclic structures, with the tin ion co-ordinated to the ionised hydroxyl groups of the sugar moiety.These cyclic structures account for the high reactivity of the hydroxyl groups towards Me+, as in the complexes of ribofuranosyl nucleosides with Bu2SnO.A similar, if not identical, mechanism operates in the case of glucopyranosides.

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