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198955-38-3

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198955-38-3 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 198955-38-3 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,9,8,9,5 and 5 respectively; the second part has 2 digits, 3 and 8 respectively.
Calculate Digit Verification of CAS Registry Number 198955-38:
(8*1)+(7*9)+(6*8)+(5*9)+(4*5)+(3*5)+(2*3)+(1*8)=213
213 % 10 = 3
So 198955-38-3 is a valid CAS Registry Number.

198955-38-3Downstream Products

198955-38-3Relevant articles and documents

Total synthesis of Filipin III

Richardson, Timothy I.,Rychnovsky, Scott D.

, p. 8977 - 8996 (1999)

Filipin III (1), a polyene macrolide antibiotic, has been synthesized for the first time. The polyol chain was assembled using a stereoselective carbon-carbon bond forming strategy previously developed in our lab: a cyanohydrin acetonide alkylation and reductive decyanation sequence. The polyene segment was prepared from L-ascorbic acid. These two components were coupled using Yamaguchi's esterification, and cyclized with an intramolecular Horner-Emmons reaction to form a trisubstituted alkene. Stereoselective reduction followed by deprotection gave filipin III. This highly convergent approach to filipin III represents the first total synthesis of a methylpentaene macrolide antibiotic.

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