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156267-21-9

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156267-21-9 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 156267-21-9 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,5,6,2,6 and 7 respectively; the second part has 2 digits, 2 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 156267-21:
(8*1)+(7*5)+(6*6)+(5*2)+(4*6)+(3*7)+(2*2)+(1*1)=139
139 % 10 = 9
So 156267-21-9 is a valid CAS Registry Number.

156267-21-9Relevant articles and documents

LITHIATION ROUTES TO OXINDOLES AND 2-INDOLINETHIONES: PRECURSORS TO 2,2'-DITHIOBISINDOLES WITH TYROSINE KINASE INHIBITORY PROPERTIES

Rewcastle, Gordon W.,Denny, William A.

, p. 701 - 708 (2007/10/02)

N-Substituted oxindoles and 2-indolinethiones can be prepared by lithiation of carboxyl protected N,2-dimethylanilines followed by quenching with CO2 or CS2 respectively. 2-Indolinethione derivatives are also available via demethylation of 2-methylthioindoles, which are prepared by lithiation of N-substituted indoles and treatment with dimethyl disulfide.

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