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411225-57-5

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411225-57-5 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 411225-57-5 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 4,1,1,2,2 and 5 respectively; the second part has 2 digits, 5 and 7 respectively.
Calculate Digit Verification of CAS Registry Number 411225-57:
(8*4)+(7*1)+(6*1)+(5*2)+(4*2)+(3*5)+(2*5)+(1*7)=95
95 % 10 = 5
So 411225-57-5 is a valid CAS Registry Number.

411225-57-5Relevant articles and documents

Synthetic studies toward paraherquamides E and F and related 13C-labeled putative biosynthetic intermediates: stereocontrolled synthesis of the α-alkyl-β-methylproline ring system

Sommer, Konrad,Williams, Robert M.

, p. 7106 - 7111 (2008/12/20)

A substituted 2R-allyl-3S-methylproline ethyl ester suitable for elaboration to paraherquamides E, F and related 13C-labeled putative biosynthesis intermediates have been prepared efficiently in six steps and?24% overall yield. The key steps are a 5-exo-trig cyclization of a zinc enolate on an unactivated alkene and a stereocontrolled alkylation of the enolate formed from 3S-methyl-pyrrolidine-1,2R-dicarboxylic acid 1-tert-butyl ester 2-ethyl ester.

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