Cas 137990-77-3,C9H7(2)H5OS

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Check Digit Verification of cas no

The CAS Registry Mumber 137990-77-3 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,3,7,9,9 and 0 respectively; the second part has 2 digits, 7 and 7 respectively.
Calculate Digit Verification of CAS Registry Number 137990-77:
(8*1)+(7*3)+(6*7)+(5*9)+(4*9)+(3*0)+(2*7)+(1*7)=173
173 % 10 = 3
So 137990-77-3 is a valid CAS Registry Number.

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137990-77-3Relevant academic research and scientific papers

Optically pure chiral sulfoxides using ephedrine as a chiral auxiliary

Benson, Scott C.,Snyder, John K.

, p. 5885 - 5888 (1991)

Optically pure chiral sulfoxides can be formed in good to excellent yields by sequential displacement reactions of organometallic reagents on the 1,2,3-oxathiazolidine-S-oxide formed from ephedrine and thionyl chloride, a modification of the Wudl and Lee procedure.

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