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172794-57-9

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172794-57-9 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 172794-57-9 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,7,2,7,9 and 4 respectively; the second part has 2 digits, 5 and 7 respectively.
Calculate Digit Verification of CAS Registry Number 172794-57:
(8*1)+(7*7)+(6*2)+(5*7)+(4*9)+(3*4)+(2*5)+(1*7)=169
169 % 10 = 9
So 172794-57-9 is a valid CAS Registry Number.

172794-57-9Downstream Products

172794-57-9Relevant articles and documents

A new methodology for the preparation of 2-cyanopyrroles and synthesis of porphobilinogen

Adamczyk, Maciej,Reddy, Rajarathnam E.

, p. 14689 - 14700 (1996)

Condensation of α-acetoxynitro compounds 4a-f with isocyanoacetonitrile (5) using DBU in THF afforded 2-cyano-3,4-substituted pyrroles 6a-f, in good yield. Porphobilinogen (PBG, 12), the key building block for the preparation of tetrapyrrolic natural products, was synthesized from 2-cyano-3,4-substituted pyrrole 6f, in four steps.

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