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457654-72-7

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457654-72-7 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 457654-72-7 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 4,5,7,6,5 and 4 respectively; the second part has 2 digits, 7 and 2 respectively.
Calculate Digit Verification of CAS Registry Number 457654-72:
(8*4)+(7*5)+(6*7)+(5*6)+(4*5)+(3*4)+(2*7)+(1*2)=187
187 % 10 = 7
So 457654-72-7 is a valid CAS Registry Number.

457654-72-7Relevant articles and documents

Rhodium-Catalyzed Enantioselective Synthesis of Oxazinones via an Asymmetric Ring Opening-Lactonization Cascade of Oxabicyclic Alkenes

Yen, Andy,Pham, Anh Hoang,Larin, Egor M.,Lautens, Mark

supporting information, p. 7549 - 7553 (2019/10/02)

The rhodium-catalyzed asymmetric ring opening reaction of oxabicyclic alkenes is shown to be an efficient method for synthesizing chiral heterocycles. We demonstrate that the pairwise combination of chiral catalyst with chiral amino-acid-derived pronucleophiles results in a stereodivergent synthesis of diastereomeric hydroxyesters. A favorable conformational preference induces the subsequent lactonization of one diastereomer leading to the highly enantioselective synthesis of oxazinones.

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