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200188-57-4

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200188-57-4 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 200188-57-4 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,0,0,1,8 and 8 respectively; the second part has 2 digits, 5 and 7 respectively.
Calculate Digit Verification of CAS Registry Number 200188-57:
(8*2)+(7*0)+(6*0)+(5*1)+(4*8)+(3*8)+(2*5)+(1*7)=94
94 % 10 = 4
So 200188-57-4 is a valid CAS Registry Number.

200188-57-4Relevant articles and documents

A convenient and efficient one-pot synthesis of arylacetones from (E)-3-aryl-2-methylacrylic acids by curtius rearrangement

He, Xin,Cao, Chong,Liang, Jingwei,Li, Xinyang,Zhang, Tingjian,Meng, Fanhao

, p. 386 - 390 (2017)

A convenient and efficient method was developed for the synthesis of arylacetones from (E)-3-aryl-2-methylacrylic acids through a Curtius rearrangement. The Curtius rearrangement of (E)-3-aryl-2-methylacryloyl azides and subsequent hydrolysis proceeded at mild temperatures in a two-phase medium of carbon tetrachloride and water containing a catalytic amount of tetrabutylammonium bromide to give the corresponding derivatives in 82-93% yield.

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