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201855-64-3

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201855-64-3 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 201855-64-3 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,0,1,8,5 and 5 respectively; the second part has 2 digits, 6 and 4 respectively.
Calculate Digit Verification of CAS Registry Number 201855-64:
(8*2)+(7*0)+(6*1)+(5*8)+(4*5)+(3*5)+(2*6)+(1*4)=113
113 % 10 = 3
So 201855-64-3 is a valid CAS Registry Number.

201855-64-3Upstream product

201855-64-3Relevant articles and documents

A convenient synthesis of (-)-paroxetine

Czibula, Laszlo,Nemes, Andras,Seboek, Ferenc,Szantay Jr., Csaba,Mak, Marianna

, p. 3336 - 3339 (2007/10/03)

A convenient synthesis of the antidepressant paroxetine starting from 1-benzyl-4-piperidone (2) is reported. A stereoselective reduction resulted in cis-piperidine-3-methanol [(+)-6]. The reaction between cis-piperidine-3- methanol mesylate (7) and sesamol led to benzyl-protected trans-paroxetine (9) through an inversion reaction of the stereogenic center at position 3. The latter compound was deprotected by hydrogenolysis. Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2004.

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