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81658-03-9

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81658-03-9 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 81658-03-9 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 8,1,6,5 and 8 respectively; the second part has 2 digits, 0 and 3 respectively.
Calculate Digit Verification of CAS Registry Number 81658-03:
(7*8)+(6*1)+(5*6)+(4*5)+(3*8)+(2*0)+(1*3)=139
139 % 10 = 9
So 81658-03-9 is a valid CAS Registry Number.

81658-03-9Downstream Products

81658-03-9Relevant articles and documents

THE INVENTION OF RADICAL REACTIONS. PART XIX. THE SYNTHESIS OF VERY HINDERED QUINONES

Barton, Derek H. R.,Sas, Woijciech

, p. 3419 - 3430 (2007/10/02)

On photolysis with tungsten light, the acyl derivatives of N-hydroxy-2-thiopyridone afford carbon radicals which readily add to quinones.In the case of benzoquinone radical addition is followed by 2-thiopyridyl transfer to afford adducts of type 4.Two different procedures were developed for the conversion of type 4 compounds into hindered quinones of type 7.

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