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105561-05-5

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105561-05-5 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 105561-05-5 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,0,5,5,6 and 1 respectively; the second part has 2 digits, 0 and 5 respectively.
Calculate Digit Verification of CAS Registry Number 105561-05:
(8*1)+(7*0)+(6*5)+(5*5)+(4*6)+(3*1)+(2*0)+(1*5)=95
95 % 10 = 5
So 105561-05-5 is a valid CAS Registry Number.

105561-05-5Relevant articles and documents

SYNTHESIS OF STEREOISOMERIC VINCAMINES

Koblicova, Zdena,Holubek, Jiri,Trojanek, Jan

, p. 2722 - 2730 (2007/10/02)

The synthesis of (+/-)-vincamine (I), (+/-)-16-epi-vincamine (XVIII) and (+/-)-16-epi-21-epivincamine (XVII) from 1-ethyl-2,3,4,6,7,12-hexahydroindoloquinolizine (IV) and 2-chloroacrylonitrile is described.It is characterized by a novel method of oxidation of the key intermediates, (+/-)-deoxyvincamine (II) and (+/-)-16-epi-21-epi-deoxyvincamine (XIII) with oxodiperoxymolybdenum (pyridine) (hexamethylphosphoric triamide).The deoxy derivatives II and XIII were prepared by direct or stepwise acid or alkaline hydrolysis od stereoisomeric (+/-)-eburnane-16-carbonitriles IX-XII, obtained by reduction of the primary immonium salt V, and subsequent esterification.In some cases, the hydrolysis is accompanied by epimerization at C(16).

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