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404953-16-8

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404953-16-8 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 404953-16-8 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 4,0,4,9,5 and 3 respectively; the second part has 2 digits, 1 and 6 respectively.
Calculate Digit Verification of CAS Registry Number 404953-16:
(8*4)+(7*0)+(6*4)+(5*9)+(4*5)+(3*3)+(2*1)+(1*6)=138
138 % 10 = 8
So 404953-16-8 is a valid CAS Registry Number.

404953-16-8Relevant articles and documents

Enantioselective synthesis of peperomins A, C, D, and analogs - Examination of diastereoselective cuprate conjugate additions to N-enoyl-4-diphenylmethyl-2-oxazolidinones

Sibi, Mukund P.,Johnson, Michael D.,Punniyamurthy

, p. 1546 - 1555 (2007/10/03)

A concise and general route to secolignans has been developed. The first total synthesis of secolignans peperomin A (1a), peperomin C (1b), and peperomin D (1c) was accomplished in ~28% overall yield over five synthetic steps. Peperomin analogs (1d) and (1e), possessing two differentially substituted aryl groups, were synthesized by a highly selective conjugate addition. The overall yield for the analogs 1d and 1e were 27 and 26%, respectively.

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