81549-13-5 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 81549-13-5 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 8,1,5,4 and 9 respectively; the second part has 2 digits, 1 and 3 respectively.
Calculate Digit Verification of CAS Registry Number 81549-13:
(7*8)+(6*1)+(5*5)+(4*4)+(3*9)+(2*1)+(1*3)=135
135 % 10 = 5
So 81549-13-5 is a valid CAS Registry Number.
81549-13-5Relevant articles and documents
The preparation of some thiochroman-3-ones and derivatives
Clark, Peter D.,McKinnon, David M.
, p. 243 - 248 (2007/10/02)
The use of 2,3-dihydrobenzothiophene-2,3-dione as a source of 2-mercaptophenylacetic acid permits a convenient preparation of 2-carboxymethylthiophenylacetic acid or derivatives.These undergo a Dieckmann cyclization to 3-acetoxybenzothiopyrans, which m