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691885-26-4

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691885-26-4 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 691885-26-4 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 6,9,1,8,8 and 5 respectively; the second part has 2 digits, 2 and 6 respectively.
Calculate Digit Verification of CAS Registry Number 691885-26:
(8*6)+(7*9)+(6*1)+(5*8)+(4*8)+(3*5)+(2*2)+(1*6)=214
214 % 10 = 4
So 691885-26-4 is a valid CAS Registry Number.

691885-26-4Relevant articles and documents

General synthesis of unnatural 4-, 5-, 6-, and 7-bromo-D-tryptophans by means of a regioselective indole alkylation

Bartoccini, Francesca,Fanini, Fabiola,Retini, Michele,Piersanti, Giovanni

, (2020/04/21)

A general two-step approach to enantiopure bromotryptophans from unprotected bromoindoles has been developed. Indole nucleophiles prepared with MeMgCl in the presence of CuCl reacted with cyclic sulfamidates derived from enantiopure D-serine to form 4-, 5-, 6-, or 7-bromo-D-tryptophan and some other halogenated tryptophans in moderate yields but with complete regioselectivity. The bromotryptophan derivatives were deprotected using mild conditions.

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