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140244-83-3

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140244-83-3 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 140244-83-3 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,4,0,2,4 and 4 respectively; the second part has 2 digits, 8 and 3 respectively.
Calculate Digit Verification of CAS Registry Number 140244-83:
(8*1)+(7*4)+(6*0)+(5*2)+(4*4)+(3*4)+(2*8)+(1*3)=93
93 % 10 = 3
So 140244-83-3 is a valid CAS Registry Number.

140244-83-3Upstream product

140244-83-3Relevant articles and documents

A general procedure to selectively prepare N-alkylanilines by an unexpected reaction of (Z)-(tert-butylsulfanyl)(aryl)diazenes with alkyllithium reagents

Barbero, Margherita,Degani, Iacopo,Dughera, Stefano,Fochi, Rita

, p. 742 - 750 (2007/10/03)

A general procedure has been set up to prepare, selectively, the N-monoalkylanilines 7, reacting (Z)-(tert-butylsulfanyl)(aryl)diazenes 3 with alkyllithium 6 (MeLi, BuLi, s-BuLi, n-C6H13Li). The reactions were carried out in anhydrous diethyl ether at 0°C or - 78°C, depending on the reagent 6, and then at room temperature. In optimal conditions the yields of the pure products 7 (uncontaminated by dialkylation products) were from good to excellent: for 38 considered examples, 34 were positive with yields varying between 61percent and 91percent (average yield 78percent). Collateral proofs were carried out to support a hypothesized reaction mechanism.

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