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33177-56-9

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33177-56-9 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 33177-56-9 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 3,3,1,7 and 7 respectively; the second part has 2 digits, 5 and 6 respectively.
Calculate Digit Verification of CAS Registry Number 33177-56:
(7*3)+(6*3)+(5*1)+(4*7)+(3*7)+(2*5)+(1*6)=109
109 % 10 = 9
So 33177-56-9 is a valid CAS Registry Number.

33177-56-9Downstream Products

33177-56-9Relevant articles and documents

A highly stereoselective synthesis of 2,3,4,5-tetrasubstituted-trans-2,3-dihydrofurans

Cao, Weiguo,Ding, Weiyu,Chen, Jie,Chen, Yali,Zang, Qin,Chen, Guodong

, p. 1599 - 1608 (2007/10/03)

α,β-Unsaturated sulfones derivatives 5 was prepared from sodium p-toluenesulfinate (1) and the products reacted with substituted-carbomethoxymethyltriphenylarsonium bromide 6 in the presence of potassium carbonate at room temperature to give cyclopropane derivatives 2-substituted-3-substitutedphenyl-4-p-toluenesulfonyl-5-phenyl-trans-2, 3-dihydrofurans 7 and/or 8 with high stereoselectivity.

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