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7631-93-8

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7631-93-8 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 7631-93-8 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 7,6,3 and 1 respectively; the second part has 2 digits, 9 and 3 respectively.
Calculate Digit Verification of CAS Registry Number 7631-93:
(6*7)+(5*6)+(4*3)+(3*1)+(2*9)+(1*3)=108
108 % 10 = 8
So 7631-93-8 is a valid CAS Registry Number.
InChI:InChI=1/C8H8O3.Na/c1-11-8(10)6-4-2-3-5-7(6)9;/h2-5,9H,1H3;/q;+1/p-1

7631-93-8Relevant articles and documents

Synthesis of coumarins, 4-hydroxycoumarins, and 4-hydroxyquinolinones by tellurium-triggered cyclizations

Dittmer, Donald C.,Li, Qun,Avilov, Dimitry V.

, p. 4682 - 4686 (2007/10/03)

Coumarins, 4-hydroxycoumarins, and 4-hydroxyquinolin-2(1H)-ones can be conveniently prepared by treatment of α-halocarboxylic acid esters of salicylaldehyde, o-hydroxyacetophenone, methyl salicylate, and methyl N-methyl- or N-phenylanthranilates with sodium or lithium telluride. Phenylketene formation competes with cyclization of the α-chlorophenylacetate ester of methyl salicylate as demonstrated by a trapping experiment with benzylamine. Elemental tellurium may be recovered and reused.

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