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132203-11-3

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132203-11-3 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 132203-11-3 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,3,2,2,0 and 3 respectively; the second part has 2 digits, 1 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 132203-11:
(8*1)+(7*3)+(6*2)+(5*2)+(4*0)+(3*3)+(2*1)+(1*1)=63
63 % 10 = 3
So 132203-11-3 is a valid CAS Registry Number.

132203-11-3Relevant articles and documents

Synthesis of (+)-biotin: Efficient resolution of key intermediates

Bihovsky,Bodepudi

, p. 7667 - 7676 (1990)

Enantiomerically pure 4-chlorothieno[3,4-d]imidazol-2-one (+)-2 and thieno[3,4-d]imidazol-2,4-dione (+)-5, key intermediates in independent routes to (+)-biotin (6), have been prepared by resolution via the corresponding diastereomeric ethers (3d-g and 3'd-g). Efficient procedures to recycle the undesired diastereomers and recover the chiral auxiliary have been developed.

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