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208763-71-7

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208763-71-7 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 208763-71-7 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,0,8,7,6 and 3 respectively; the second part has 2 digits, 7 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 208763-71:
(8*2)+(7*0)+(6*8)+(5*7)+(4*6)+(3*3)+(2*7)+(1*1)=147
147 % 10 = 7
So 208763-71-7 is a valid CAS Registry Number.

208763-71-7Downstream Products

208763-71-7Relevant academic research and scientific papers

Nitrodisplacement reactions and the synthesis of bis (ether anhydride) s from dihydroxynaphthalenes

Eastmond, Geoffrey C.,Paprotny, Jerzy

, p. 1455 - 1458 (2007/10/03)

Nitrodisplacement reactions between all ten dihydroxynaphthalenes and 4-nitrophthalodinitrile have been studied. Apart from 1,8-dihydroxynaphthalene, all dihydroxynaphthalenes undergo nitrodisplacement but only 1,5-, 2,3-, 2,6- and 2,7-dihydroxynaphthalenes give high yields of pure bis(ether dinitrile). The bis(ether dinitrile)s produced in high yield were hydrolysed and converted to bis(ether anhydride) for subsequent synthesis of poly (ether imide)s. Success in nitrodisplacement correlates with high redox potentials for the dihydroxynaphthalenes, except for 1,8-dihydroxynaphthalene which probably fails to react because of steric constraints at the peri positions.

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