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4857-21-0

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4857-21-0 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 4857-21-0 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 4,8,5 and 7 respectively; the second part has 2 digits, 2 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 4857-21:
(6*4)+(5*8)+(4*5)+(3*7)+(2*2)+(1*1)=110
110 % 10 = 0
So 4857-21-0 is a valid CAS Registry Number.

4857-21-0Relevant articles and documents

A CONVENIENT METHOD FOR THE SYNTHESIS OF α,β-UNSATURATED CARBONYL COMPOUNDS

Mukaiyama, Teruaki,Ohsumi, Tadashi

, p. 875 - 878 (2007/10/02)

A variety of α,β-unsaturated ketones are conveniently synthesized from enaminoketones and organolithium compounds especially when the reaction is carried out in petroleum ether; this reaction provides a facile method for the synthesis of α,β,γ-trisubstituted 2-cyclopentenones in combination with the regioselective alkylation of enaminoketones.

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