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947703-53-9

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947703-53-9 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 947703-53-9 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 9,4,7,7,0 and 3 respectively; the second part has 2 digits, 5 and 3 respectively.
Calculate Digit Verification of CAS Registry Number 947703-53:
(8*9)+(7*4)+(6*7)+(5*7)+(4*0)+(3*3)+(2*5)+(1*3)=199
199 % 10 = 9
So 947703-53-9 is a valid CAS Registry Number.

947703-53-9Downstream Products

947703-53-9Relevant articles and documents

PROCESS FOR THE PREPARATION OF HIGHLY OPTICAL PURE CARVEDILOL

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Page/Page column 18-19, (2008/06/13)

The present invention relates to a process for the efficient preparation of highly optical pure chiral carvedilol. According to the present invention, a chiral oxazolidin-2-one or oxazolidin-2-thione having formula 2, produced from the reaction of N-protected 2-(2-methoxyphenoxy)ethylamine with a chiral glycidol derivative is used as a key intermediate for the preparation of the chiral carvedilol. Specifically, the process for the preparation of the chiral carvedilol comprises a) reacting a compound of formula 2 with a halogenation agent, a sulfonation agent or a mitsunobu reagent to activate a hydroxyl group of the compound of formula 2, followed by nucleophilic substitution reaction with 9H-4-hydroxy carbazole to produce a compound of formula 7, and b) subjecting the obtained compound of formula 7 to a deprotection reaction in a presence of an inorganic base to produce the targeted chiral carvedilol. The process of the present invention can be accomplished in a mild condition. The process neither requires any extraordinary purification procedure, nor involves decrease of optical purity. Therefore, the process of the present invention provides highly optical pure chiral carvedilol in simple and efficient manner.

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