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137406-90-7

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137406-90-7 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 137406-90-7 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,3,7,4,0 and 6 respectively; the second part has 2 digits, 9 and 0 respectively.
Calculate Digit Verification of CAS Registry Number 137406-90:
(8*1)+(7*3)+(6*7)+(5*4)+(4*0)+(3*6)+(2*9)+(1*0)=127
127 % 10 = 7
So 137406-90-7 is a valid CAS Registry Number.

137406-90-7Relevant articles and documents

The synthesis of pyrroles and dihydropyrroles by 1,3-dipolar cyclisations of N-arylmethylene[(benzotriazol-1-yl)arylmethyl]amines

Katritzky,Hitchings,Zhao

, p. 863 - 867 (2007/10/02)

N-Arylmethylene[(benzotriazol-1-yl)arylmethyl]amines 1 are prepared by the reaction of arylaldehydes, benzotriazole, and ammonia in dry ethanol. Deprotonation of these imines with butyllithium yields N-lithiated azomethine ylides 2 which readily undergo 1,3-dipolar cycloaddition with a large range of dipolarophiles. The cyclisations are regiospecific and generally exhibit high stereoselectivity. Benzotriazolate is eliminated during the course of the reaction, and the method thereby provides a route to 2,5-diaryl substituted pyrroles, 3,4-dihydro-2H-pyrroles and c-ring fused 3,4-dihydro-2H-pyrroles.

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