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144729-20-4

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144729-20-4 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 144729-20-4 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,4,4,7,2 and 9 respectively; the second part has 2 digits, 2 and 0 respectively.
Calculate Digit Verification of CAS Registry Number 144729-20:
(8*1)+(7*4)+(6*4)+(5*7)+(4*2)+(3*9)+(2*2)+(1*0)=134
134 % 10 = 4
So 144729-20-4 is a valid CAS Registry Number.

144729-20-4Relevant articles and documents

The sydnone ring as an ortho-director of lithiation. 2. Dilithiation of 3-phenylsydnone and regiospecific @?o-aryl acylation using N-methoxy-N-methylamides

Turnbull, Kenneth,Sun, Congcong,Krein, Douglas M.

, p. 1509 - 1512 (2007/10/03)

Readily available 3-phenylsydnone (1) reacts with n-butyllithium/TMEDA to form the dilithio species 2 which can be regiospecifically acylated at the ortho-aryl position using N-methoxy-N-methylamides (Weinreb's amides).

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