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255042-04-7

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255042-04-7 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 255042-04-7 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,5,5,0,4 and 2 respectively; the second part has 2 digits, 0 and 4 respectively.
Calculate Digit Verification of CAS Registry Number 255042-04:
(8*2)+(7*5)+(6*5)+(5*0)+(4*4)+(3*2)+(2*0)+(1*4)=107
107 % 10 = 7
So 255042-04-7 is a valid CAS Registry Number.

255042-04-7Downstream Products

255042-04-7Relevant articles and documents

Cesium effect: High chemoselectivity in direct N-alkylation of amines

Salvatore, Ralph Nicholas,Nagle, Advait S.,Kyung, Woon Jung

, p. 674 - 683 (2007/10/03)

A novel method for the mono-N-alkylation of primary amines, diamines, and polyamines was developed using cesium bases in order to prepare secondary amines efficiently. A cesium base not only promoted alkylation of primary amines but also suppressed overalkylations of the produced secondary amines. Various amines, alkyl bromides, and alkyl sulfonates were examined, and the results demonstrated this methodology was highly chemoselective to favor mono-N-alkylation over dialkylation. In particular, use of either sterically demanding substrates or amino acid derivatives afforded the secondary amines exclusively, offering wide applications in peptidomimetic syntheses.

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