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1221821-69-7

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1221821-69-7 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 1221821-69-7 includes 10 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 7 digits, 1,2,2,1,8,2 and 1 respectively; the second part has 2 digits, 6 and 9 respectively.
Calculate Digit Verification of CAS Registry Number 1221821-69:
(9*1)+(8*2)+(7*2)+(6*1)+(5*8)+(4*2)+(3*1)+(2*6)+(1*9)=117
117 % 10 = 7
So 1221821-69-7 is a valid CAS Registry Number.

1221821-69-7Relevant articles and documents

Synthesis of isoxazoles via cyclization of β-fluoro enones with sodium azide

Li, Liangkui,Huang, Shiqing,Mao, Kuantao,Lv, Leiyang,Li, Zhiping

, (2021/04/22)

A practical method for the synthesis of 3,5-disubstituted isoxazoles via cyclization of β-fluoro enones with sodium azide was disclosed. Density functional theory (DFT) calculation indicated that both (1) the azirine formation followed by intramolecular rearrangement and (2) direct enolate O-attack via 5-exo-trig cyclization of vinyl azide were possible for the isoxazole formation.

Synthesis of 2,3 and 4,5-dihydro-hydroxy-isoxazoles and isoxazoles under different pH conditions

Andrzejak, Virginie,Millet, Regis,Bakali, Jamal El,Guelzim, Abdelhalim,Gluszok, Sebastien,Chavatte, Philippe,Bonte, Jean-Paul,Vaccher, Claude,Lipka, Emmanuelle

experimental part, p. 32 - 38 (2010/08/05)

Reaction between aryl 1,3-diketoesters 2a-e and hydroxylamine hydrochloride has been investigated under different experimental conditions. Whereas acid conditions gave principally 3,5-isoxazole esters (3a-e), reactions under neutral and basic conditions l

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