Cas 33839-89-3,2-Benzoyl-4H-1,3-benzothiazine

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Check Digit Verification of cas no

The CAS Registry Mumber 33839-89-3 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 3,3,8,3 and 9 respectively; the second part has 2 digits, 8 and 9 respectively.
Calculate Digit Verification of CAS Registry Number 33839-89:
(7*3)+(6*3)+(5*8)+(4*3)+(3*9)+(2*8)+(1*9)=143
143 % 10 = 3
So 33839-89-3 is a valid CAS Registry Number.

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33839-89-3Relevant academic research and scientific papers

Cycloaddition of Benzothiete and Electron-deficient Nitriles

Schmidt, Michael,Meier, Herbert,Saleh, Sadiq A.

, p. 573 - 575 (2007/10/02)

The o-quinoid 8? electron system 2, generated by thermal ring opening of benzothiete (1), enters regiospecific (8? + 2?) cycloaddition reactions with electron-deficient nitriles 3a-d, yielding the 4H-1,3-benzothiazines 4a-d.A competitive dimerization of 1

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