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257940-60-6

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257940-60-6 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 257940-60-6 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,5,7,9,4 and 0 respectively; the second part has 2 digits, 6 and 0 respectively.
Calculate Digit Verification of CAS Registry Number 257940-60:
(8*2)+(7*5)+(6*7)+(5*9)+(4*4)+(3*0)+(2*6)+(1*0)=166
166 % 10 = 6
So 257940-60-6 is a valid CAS Registry Number.

257940-60-6Downstream Products

257940-60-6Relevant articles and documents

Synthesis of substituted pyrrolidines by sequential radical cyclization and N-acyliminium ion reactions

Matos, Marta R. P. Norton,Afonso, Carlos A. M.,McGarvey, Timothy,Lee, Paul,Batey, Robert A.

, p. 9189 - 9193 (1999)

Readily available N-acyl-2-pyrrolines are converted into functionalized α-alkoxy-β-iodopyrrolidines by N-iodosuccinimide promoted alcohol addition to the enamine group. These compounds are readily cyclized using a sodium cyanoborohydride-catalytic tributylstannane system affording functionalized pyrrolidines in good yields. The cyclized products undergo N-acyliminium ion reactions, such as BF3·OEt2 mediated addition of allyltrimethylsilane.

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