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561276-76-4

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561276-76-4 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 561276-76-4 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 5,6,1,2,7 and 6 respectively; the second part has 2 digits, 7 and 6 respectively.
Calculate Digit Verification of CAS Registry Number 561276-76:
(8*5)+(7*6)+(6*1)+(5*2)+(4*7)+(3*6)+(2*7)+(1*6)=164
164 % 10 = 4
So 561276-76-4 is a valid CAS Registry Number.

561276-76-4Downstream Products

561276-76-4Relevant articles and documents

New insights into the reduction of β,δ-diketo-sulfoxides

Hanquet, Gilles,Salom-Roig, Xavier J.,Gressot-Kempf, Laurence,Lanners, Steve,Solladie, Guy

, p. 1291 - 1301 (2007/10/03)

New developments in the reduction of β,δ-diketo-sulfoxides, a reaction that affords important key intermediates for total synthesis, are described. We showed without ambiguity using NMR experiments, that the β-carbonyl group is totally enolised. This result is inconsistent with the previous hypothesis, which supposed the other tautomer (enolisation at the δ-position) as the major one. We propose a rationale to explain the side reactions occurring during the reduction of unprotected β,δ-diketo-sulfoxides and showed that judicious protection of the δ-carbonyl group gave all diastereoisomers of β-hydroxy-δ-ketosulfoxides.

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