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221171-91-1

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221171-91-1 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 221171-91-1 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,2,1,1,7 and 1 respectively; the second part has 2 digits, 9 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 221171-91:
(8*2)+(7*2)+(6*1)+(5*1)+(4*7)+(3*1)+(2*9)+(1*1)=91
91 % 10 = 1
So 221171-91-1 is a valid CAS Registry Number.

221171-91-1Relevant articles and documents

Synthesis of 2-halo-2H-azirines from phosphorus ylides

Pinho e Melo, Teresa M. V. D.,Rocha Gonsalves, Antonio M. D'A.,Lopes, Claudia S. J.,Gilchrist, Thomas L.

, p. 789 - 792 (1999)

α-Oxophosphonium ylides (3a-3e) react with N-chlorosuccinimide and N- bromosuccinimide in the presence of azidotrimethylsilane giving the corresponding haloazidoalkenes (4a-4g) with elimination of triphenylphosphine oxide. These compounds were completely convened to the 2H-azirines 5a-5g on heating in heptane.

Synthesis and reactivity of 2-halo-2H-azirines towards nucleophiles

Pinho e Melo,Lopes,Gonsalves

, p. 7217 - 7220 (2007/10/03)

Nucleophilic substitution reactions of 2-halo-2H-azirine with potassium phthalimide and aniline allowed the preparation of new substituted 2H-azirines. The reactions of 2-bromo-3-phenyl-2H-azirine-2-carboxylate with methylamine led to the synthesis of α-diimines and from the reaction with water, a 3-oxazoline was obtained. (C) 2000 Published by Elsevier Science Ltd.

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