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154138-26-8

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154138-26-8 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 154138-26-8 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,5,4,1,3 and 8 respectively; the second part has 2 digits, 2 and 6 respectively.
Calculate Digit Verification of CAS Registry Number 154138-26:
(8*1)+(7*5)+(6*4)+(5*1)+(4*3)+(3*8)+(2*2)+(1*6)=118
118 % 10 = 8
So 154138-26-8 is a valid CAS Registry Number.

154138-26-8Downstream Products

154138-26-8Relevant articles and documents

Regiospecific synthesis of 3,5-bis(bromomethyl)benzoic acid, a cysteine crosslinking agent

Engel,Burris,Slate,Erickson

, p. 8761 - 8770 (1993)

Bridging two molecules of an organic thiol with the 3,5-dimethylenebenzoic acid (Dmb) group produces a rigid five-carbon Dmb crosslink that is stable to disulfide reducing agents. Radical bromination of 3,5-dimethylbenzoic acid or its succinimido ester gave four α-brominated products. So NMR-pure 3,5-bis(bromomethyl)benzoic acid (Br2Dmb) was regiospecifically synthesized in 38% overall yield by a four-step route from 1,3,5-benzenetricarboxylic acid. S-Alkylation of cysteine methyl ester, a model thiol, with Br2Dmb provided the 2:1 adduct (Cys-OCH3)2Dmb in 79% yield. Subsequent N-protection with di(tert-butyl) dicarbonate gave (Boc-Cys-OCH3)2Dmb in 60% overall yield from cysteine methyl ester. This protected diamino acid is suitable for assembly of two Dmb-crosslinked peptide chains.

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