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33956-18-2

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33956-18-2 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 33956-18-2 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 3,3,9,5 and 6 respectively; the second part has 2 digits, 1 and 8 respectively.
Calculate Digit Verification of CAS Registry Number 33956-18:
(7*3)+(6*3)+(5*9)+(4*5)+(3*6)+(2*1)+(1*8)=132
132 % 10 = 2
So 33956-18-2 is a valid CAS Registry Number.

33956-18-2Relevant articles and documents

MIXED ANHYDRIDES IN PEPTIDE SYNTHESIS. A STUDY URETHANE FORMATION WITH A CONTRIBUTION ON MINIMIZATION OF RACEMIZATION

Chen, Francis M. F.,Lee, Young,Steinauer, Rene,Benoiton, N. Leo

, p. 613 - 618 (2007/10/02)

A study of the factors contributing to urethane formation during the coupling of N-alkoxycarbonylamino acids with an amino acid ester by the mixed carboxylic-carbonic acid anhydride method has been carried out, using nuclear magnetic resonance spectroscop

Mixed Anhydrides in Peptide Synthesis. Reduction of Urethane Formation and Racemization Using N-Methylpiperidine as the Tertiary Amine Base

Chen, Francis M. F.,Steinauer, Rene,Benoiton, N. Leo

, p. 2939 - 2941 (2007/10/02)

The side reactions of urethane formation and racemization accompanying couplings by the mixed anhydride method are reduced when N-methylpiperidine is used as base, the best results being achieved in dichloromethane.

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