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187521-90-0

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187521-90-0 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 187521-90-0 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,8,7,5,2 and 1 respectively; the second part has 2 digits, 9 and 0 respectively.
Calculate Digit Verification of CAS Registry Number 187521-90:
(8*1)+(7*8)+(6*7)+(5*5)+(4*2)+(3*1)+(2*9)+(1*0)=160
160 % 10 = 0
So 187521-90-0 is a valid CAS Registry Number.

187521-90-0Relevant articles and documents

An Improved Preparation of Oxazolidin-2-one Chiral Auxiliaries

Sudharshan, Manjula,Hultin, Philip G.

, p. 171 - 172 (1997)

Reduction of carbamate-blocked amino esters by lithium borohydride (made in situ from sodium borohydride and lithium iodide) forms chiral 4-substituted oxazolidin-2-ones directly. The presence of iodide in the reaction mixture appears to promote the cyclization of the intermediate alkoxyborohydride. This provides a route to these important chiral auxiliaries, employing less hazardous reagents and simpler reaction conditions than do most existing methods.

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