71690-21-6 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 71690-21-6 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 7,1,6,9 and 0 respectively; the second part has 2 digits, 2 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 71690-21:
(7*7)+(6*1)+(5*6)+(4*9)+(3*0)+(2*2)+(1*1)=126
126 % 10 = 6
So 71690-21-6 is a valid CAS Registry Number.
71690-21-6Relevant articles and documents
Photochemical Synthesis of Benzothiazoles
Paramasivam, R.,Ramakrishnan, V. T.
, p. 930 - 934 (2007/10/02)
Irradiation of o-halothioacetanilides (1a-p) affords benzothiazoles (2a-p) in general.In methanol medium, polyhalogenated thioacetanilides yield benzothiazoles with the loss of bromine atom in the 4- or 6-position of the benzothiazole.Arylation of benzothiazoles occurs in benzene medium.