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873550-81-3

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873550-81-3 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 873550-81-3 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 8,7,3,5,5 and 0 respectively; the second part has 2 digits, 8 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 873550-81:
(8*8)+(7*7)+(6*3)+(5*5)+(4*5)+(3*0)+(2*8)+(1*1)=193
193 % 10 = 3
So 873550-81-3 is a valid CAS Registry Number.

873550-81-3Relevant articles and documents

Enantiomerically pure 4-amino-1,2,3-trihydroxybutylphosphonic acids

Wróblewski, Andrzej E.,G?owacka, Iwona E.

, p. 11930 - 11938 (2007/10/03)

(1S,2R,3S)-, (1R,2R,3S)- and (1S,2R,3R)-4-amino-1,2,3- trihydroxybutylphosphonic acids were synthesised. The synthetic strategy involved preparation of the respective 4-azido-2,3-O-isopropylidene-l-threose or -d-erythrose, addition of dialkyl phosphites, separation of C-1 epimeric O,O-dibenzyl phosphonates, the reduction of azides and the removal of the protecting groups. The (2R,3S) and (2R,3R) configurations in the final products were secured by employing diethyl l-tartrate and d-isoascorbic acid as starting materials. The stereochemical course of the addition to the carbonyl groups in 4-azido-2,3-O-isopropylidene-l-threose or -d-erythrose followed that established earlier for 2,3-O-isopropylidene-d-glyceraldehyde and similar (3:1-4:1) diastereoselectivities were achieved.

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