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218933-95-0

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218933-95-0 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 218933-95-0 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,1,8,9,3 and 3 respectively; the second part has 2 digits, 9 and 5 respectively.
Calculate Digit Verification of CAS Registry Number 218933-95:
(8*2)+(7*1)+(6*8)+(5*9)+(4*3)+(3*3)+(2*9)+(1*5)=160
160 % 10 = 0
So 218933-95-0 is a valid CAS Registry Number.

218933-95-0Relevant articles and documents

Diastereo- and enantioselective syntheses of C2-symmetric 1,n-diamines by nucleophilic addition to dialdehyde-SAMP-hydrazones

Enders, Dieter,Meiers, Michaela

, p. 2542 - 2560 (2007/10/03)

Different protected C2-symmetric 1,n-diamines (R,R)- or (S,S)-4 and 8 can be prepared in high diastereo- and enantiomeric purity by nucleophilic 1,2-addition of organocerium reagents to the CN double bond of bis-SAMP-hydrazones (S,S)-2a-c. The chiral starting materials are readily available by reaction of dialdehydes with the enantiopure hydrazine 1-amino-2-methoxymethylpyrrolidine (SAMP). Reductive NN bond cleavage of the hydrazines (R,R,S,S)- or (S,S,S,S)-3 and 7 afforded the title compounds (de 72-98%, ee 96-98%). The novel entry for the asymmetric synthesis of N-protected C2-symmetric diamines presented here is highly flexible, as both the distance of the amino functions and the introduced residues R can be varied.

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