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156578-22-2

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156578-22-2 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 156578-22-2 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,5,6,5,7 and 8 respectively; the second part has 2 digits, 2 and 2 respectively.
Calculate Digit Verification of CAS Registry Number 156578-22:
(8*1)+(7*5)+(6*6)+(5*5)+(4*7)+(3*8)+(2*2)+(1*2)=162
162 % 10 = 2
So 156578-22-2 is a valid CAS Registry Number.

156578-22-2Relevant articles and documents

Strategic synthesis of model novolac resins

De Bruyn, Pauline J.,Lim, Audrey S. C.,Looney, Mark G.,Solomon, David H.

, p. 4627 - 4630 (1994)

Model novolac resins which contain the maximum number of free ortho positions for reaction with the curing agent hexamethylenetetramine (HMTA) have been prepared. The key transformation was the ion assisted ortho-specific phenol-formaldehyde oligomerization of suitably protected precursors.

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