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644997-81-9

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644997-81-9 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 644997-81-9 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 6,4,4,9,9 and 7 respectively; the second part has 2 digits, 8 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 644997-81:
(8*6)+(7*4)+(6*4)+(5*9)+(4*9)+(3*7)+(2*8)+(1*1)=219
219 % 10 = 9
So 644997-81-9 is a valid CAS Registry Number.

644997-81-9Downstream Products

644997-81-9Relevant articles and documents

(S)-1-aminoindane: Synthesis by chirality transfer using (R)-phenylglycine amide as chiral auxiliary

Uiterweerd, Patrick G.H.,Van Der Sluis, Marcel,Kaptein, Bernard,De Lange, Ben,Kellogg, Richard M.,Broxterman, Quirinus B.

, p. 3479 - 3485 (2007/10/03)

A practical asymmetric synthesis of nearly enantiomerically pure (S)-1-aminoindane has been developed. The key step involves the diastereoselective heterogeneous metal-catalyzed reduction of the ketimine of 1-indanone with the chiral auxiliary (R)-phenylglycine amide. The selectivity of the asymmetric hydrogenation step was optimized with regard to metal catalyst, solvent and catalyst loading. The chiral auxiliary was removed by means of a novel non-reductive procedure. Thus, (S)-1-aminoindane with an ee of 96% was prepared in 58% overall yield from (R)-phenylglycine amide in an effective three-step procedure.

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