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23961-16-2

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23961-16-2 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 23961-16-2 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,3,9,6 and 1 respectively; the second part has 2 digits, 1 and 6 respectively.
Calculate Digit Verification of CAS Registry Number 23961-16:
(7*2)+(6*3)+(5*9)+(4*6)+(3*1)+(2*1)+(1*6)=112
112 % 10 = 2
So 23961-16-2 is a valid CAS Registry Number.

23961-16-2Downstream Products

23961-16-2Relevant articles and documents

The Azirine/Oxazolone Method in Peptide Chemistry: Synthesis of Tripeptide Models

Wipf, Peter,Heimgartner, Heinz

, p. 140 - 154 (2007/10/02)

Tripeptides 5, containing an α,α-disubstituted α-amino acid and ethyl p-aminobenzoate, were synthesized in high yield by application of the azirine/oxazolone method (Table 2).In this versatile approach for the incorporation of disubstituted residues into the peptide chain, N-protected peptides or amino acids are coupled with 2,2-dialkyl-3-amino-2H-azirines and, after the selective hydrolysis of the newly formed C-terminal amid bond, further condensed with amino components via in situ generated oxazole-5(4H)-ones in the presence of additives (Scheme 1).A comparison with conventional procedures clearly demonstrates the advantages of this new method that works equally well with β-branched, cyclic, or acyclic disubstituted amino acids.

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