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128916-40-5

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128916-40-5 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 128916-40-5 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,2,8,9,1 and 6 respectively; the second part has 2 digits, 4 and 0 respectively.
Calculate Digit Verification of CAS Registry Number 128916-40:
(8*1)+(7*2)+(6*8)+(5*9)+(4*1)+(3*6)+(2*4)+(1*0)=145
145 % 10 = 5
So 128916-40-5 is a valid CAS Registry Number.

128916-40-5Relevant articles and documents

Studies on the stereoselective methylation of α-sulfinyl carbanions generated from three isomeric pyridylmethyl π-tolyl sulfoxides and benzyl 2-pyridyl sulfoxide

Furukawa,Hosono,Fujihara,Ogawa

, p. 461 - 465 (1990)

A high stereoselectivity in the methylation of 2-pyridylmethyl p-totyl sulfoxide (2a) with lithium diisopropylamide and iodomethane was observed at low temperature. The chelation of Li+ by both the nitrogen atom in the pyridine ring and the sulfinyl oxygen atom in 2a promotes the stereoselectivity as compared with isomeric sulfoxides.

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