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157717-59-4

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157717-59-4 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 157717-59-4 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,5,7,7,1 and 7 respectively; the second part has 2 digits, 5 and 9 respectively.
Calculate Digit Verification of CAS Registry Number 157717-59:
(8*1)+(7*5)+(6*7)+(5*7)+(4*1)+(3*7)+(2*5)+(1*9)=164
164 % 10 = 4
So 157717-59-4 is a valid CAS Registry Number.

157717-59-4Relevant articles and documents

An asymmetric synthesis of carboxylic acid derivatives, including lactic acid and α-amino acid derivatives, from optically active 1-chlorovinyl p-tolyl sulfoxides and ester lithium enolates with creation of chirality at the α-position

Kido, Masahiro,Sugiyama, Shimpei,Satoh, Tsuyoshi

, p. 1934 - 1947 (2008/02/13)

Treatment of optically active 1-chlorovinyl p-tolyl sulfoxides, which were synthesized from symmetrical ketones or methyl formate and (R)-(-)-chloromethyl p-tolyl sulfoxide in three steps, with lithium enolate of carboxylic acid tert-butyl esters gave opt

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