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1355990-17-8

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1355990-17-8 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 1355990-17-8 includes 10 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 7 digits, 1,3,5,5,9,9 and 0 respectively; the second part has 2 digits, 1 and 7 respectively.
Calculate Digit Verification of CAS Registry Number 1355990-17:
(9*1)+(8*3)+(7*5)+(6*5)+(5*9)+(4*9)+(3*0)+(2*1)+(1*7)=188
188 % 10 = 8
So 1355990-17-8 is a valid CAS Registry Number.

1355990-17-8Relevant articles and documents

SYNTHESIS OF TREPROSTINIL AND INTERMEDIATES USEFUL THEREIN

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, (2012/02/05)

Treprostinil is prepared by a process which involves Pauson - Khan cyclization of an an alkene-substituted, alkyne-substituted benzene corresponding to formula : (I) where PMB represents para-methoxy benzyl protecting group and R1 and R2 are alcohol protecting groups. Following cyclization, the resulting compound can be subjected to several chemical transformations followed by alkylation, hydrolysis and salt formation to yield treprostinil sodium. The use of para-methoxybenzyl group as the phenolic protecting group confers several process advantages that result in simplified purification of the final product and improved yields.

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