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138457-80-4

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138457-80-4 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 138457-80-4 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,3,8,4,5 and 7 respectively; the second part has 2 digits, 8 and 0 respectively.
Calculate Digit Verification of CAS Registry Number 138457-80:
(8*1)+(7*3)+(6*8)+(5*4)+(4*5)+(3*7)+(2*8)+(1*0)=154
154 % 10 = 4
So 138457-80-4 is a valid CAS Registry Number.

138457-80-4Downstream Products

138457-80-4Relevant articles and documents

A New Way toward Z α,β Unsaturated Esters: A Pyrethroid Application

Babin, Didier,Demassey, Jacques,Demoute, Jean Pierre,Dutheil, Phillipe,Terrie, Isabelle,Tessier, Jean

, p. 584 - 589 (2007/10/02)

Use of the stereospecific condensation of β carbalkoxysulfones with aldehydes, followed by the stereospecific reduction of the afforded sulfonyl acrylate with sodium dithionite allows us to propose this method as a new way to prepare Z α,β unsaturated esters.Steric hindrance seems to be the reason for the selectivity of the reduction and the mechanism was proved, by X-ray of an intermediate, to be a cis Michael addition of HSO2-, followed by an anti elimination of SO2 and the sulfinate group.This method discovered in the pyrethroid series for the synthesis of acrinathrin 1 could have general application.

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