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1000788-70-4

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1000788-70-4 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 1000788-70-4 includes 10 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 7 digits, 1,0,0,0,7,8 and 8 respectively; the second part has 2 digits, 7 and 0 respectively.
Calculate Digit Verification of CAS Registry Number 1000788-70:
(9*1)+(8*0)+(7*0)+(6*0)+(5*7)+(4*8)+(3*8)+(2*7)+(1*0)=114
114 % 10 = 4
So 1000788-70-4 is a valid CAS Registry Number.

1000788-70-4Relevant articles and documents

And Menlust sodium process for the preparation of intermediates

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, (2017/01/09)

The invention relates to a method suitable for preparing montelukast sodium and intermediate 2-(3(S)-(3-(2-(7-chlorine-2-quinolyl) vinyl) phenyl)-3-hydroxypropyl) phenyl)-2-propoxy) tetrahydropyrane (intermediate 3) of the montelukast sodium in a large scale. According to the method, 7-chloroquinaldine and 3-cyanobenzaldehyde are used as starting raw materials, 2-(3-(3-(2-(7-chlorine-2-quinolyl) vinyl) phenyl)-3-oxopropyl) phenyl)-2-propoxy) tetrahydropyrane (intermediate 2) is obtained by six steps of reaction, then intermediate 3 with ee more than 99% and yield more than 90% is obtained by chiral reduction, and the montelukast sodium with high optical purity and high chemical purity is obtained by the intermediate 3 through four steps of reaction.

AN IMPROVED PROCESS FOR THE PREPARATION OF LEUKOTRIENE RECEPTOR ANTAGONIST (MONTELUKAST SODIUM)

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Page/Page column 9-10, (2010/11/29)

The present invention relates to an improved process for the preparation of [R-(E)]-1-[[[1-[3-[2-(7-chloroquinolin-2-yl)ethenyl]phenyl]-3-[2-(1-hydroxy-1-methylethyl)phenyl]propyl]thio]methyl]-cyclopropaneacetic acid, monosodium salt of Formula (I).

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