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242143-64-2

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242143-64-2 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 242143-64-2 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,4,2,1,4 and 3 respectively; the second part has 2 digits, 6 and 4 respectively.
Calculate Digit Verification of CAS Registry Number 242143-64:
(8*2)+(7*4)+(6*2)+(5*1)+(4*4)+(3*3)+(2*6)+(1*4)=102
102 % 10 = 2
So 242143-64-2 is a valid CAS Registry Number.

242143-64-2Upstream product

242143-64-2Relevant articles and documents

Methods for the preparation of tris-aryl-o-hydroxyphenyl-s-triazines

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, (2008/06/13)

A process for preparing 2-(2,4-dihydroxyphenyl)-4.6-diaryl-s-triazines in three steps starting with cyanuric chloride is described. Step1involves the nucleophilic (basic) displacement of one chlorine atom with a phenolic moiety. Step2involves a Friedel-Crafts reaction using a Lewis acid catalyst (preferably aluminum chloride) to replace the remaining two chlorine atoms with aryl groups such as xylyl. Finally, step3involves replacing the phenolic moiety with resorcinol using either a Lewis acid or protic acid catalyst or combinations thereof. Some additional processes only peripherally related to the three-step process outlined above are also described for the preparation of various s-triazine compounds. The s-triazines prepared are useful as UV absorbers for the stabilization of organic substrates against the adverse effects of actinic light.

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