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216311-67-0

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216311-67-0 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 216311-67-0 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,1,6,3,1 and 1 respectively; the second part has 2 digits, 6 and 7 respectively.
Calculate Digit Verification of CAS Registry Number 216311-67:
(8*2)+(7*1)+(6*6)+(5*3)+(4*1)+(3*1)+(2*6)+(1*7)=100
100 % 10 = 0
So 216311-67-0 is a valid CAS Registry Number.

216311-67-0Downstream Products

216311-67-0Relevant articles and documents

A practical ex-chiral-pool synthesis of β-proline and homo-β-proline

Thomas, Christoph,Orecher, Florian,Gmeiner, Peter

, p. 1491 - 1496 (2007/10/03)

Starting from aspartic acid an efficient synthesis of enantiomerically pure β-proline and homo-β-proline is described. The key step of the synthesis includes formation of the 1,4-biselectrophile 6, followed by rearrangement via the aziridinium intermediate 7 and ring closure to give the pyrrolidinium salt 9a which can serve as a common precursor for both target compounds.

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