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197903-55-2

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197903-55-2 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 197903-55-2 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,9,7,9,0 and 3 respectively; the second part has 2 digits, 5 and 5 respectively.
Calculate Digit Verification of CAS Registry Number 197903-55:
(8*1)+(7*9)+(6*7)+(5*9)+(4*0)+(3*3)+(2*5)+(1*5)=182
182 % 10 = 2
So 197903-55-2 is a valid CAS Registry Number.

197903-55-2Relevant articles and documents

Polymer-assisted solution-phase library synthesis of 4-alkoxy-2-hydroxy-3,5,6-trifluorobenzoic acids

Hardcastle, Ian R.,Moreno Barber, Amelia,Marriott, Jonathan H.,Jarman, Michael

, p. 1363 - 1365 (2007/10/03)

The efficient synthesis of a small library of 4-alkoxy-2-hydroxy-3,5,6-trifluorobenzoic acids is described via the fluoride mediated alkylation of 5,6,8-trifluoro-7-hydroxy-2-methyl-benzo[1,3]dioxin-4-one with a collection of structurally diverse bromoalkanes. The use of ion-exchange resins during the reaction sequence enabled the preparation of the majority of the products in 82-98% purity without the need for chromatography.

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