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426206-55-5

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426206-55-5 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 426206-55-5 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 4,2,6,2,0 and 6 respectively; the second part has 2 digits, 5 and 5 respectively.
Calculate Digit Verification of CAS Registry Number 426206-55:
(8*4)+(7*2)+(6*6)+(5*2)+(4*0)+(3*6)+(2*5)+(1*5)=125
125 % 10 = 5
So 426206-55-5 is a valid CAS Registry Number.

426206-55-5Relevant articles and documents

A chemoenzymatic total synthesis of the phytotoxic undecenolide (-)-cladospolide A.

Banwell, Martin G,Loong, David T J

, p. 2050 - 2060 (2004)

An eleven-step synthesis of the title compound (1) from biocatalytically-derived and enantiomerically pure 'building blocks' alcohol (R)-(-)-9 and ester 13 is described. Attempts to construct the twelve-membered lactone ring of cladospolide A in a direct manner by using a ring-closing metathesis (RCM) reaction failed. However, a ten-membered lactone 19, could be constructed by such means and this was then subject to a two-carbon homologation sequence involving, inter alia, Wadsworth-Horner-Emmons and Yamaguchi lactonisation reactions in the closing stages of the synthesis. The impact of substituent stereochemistries and protecting groups on the RCM reaction leading to various ten-membered lactones is also described.

A chemoenzymatic synthesis of the 12-membered macrolide (-)-cladospolide A

Banwell,Jolliffe,Loong,McRae,Vounatsos

, p. 22 - 25 (2007/10/03)

The enantiomerically pure cis-1,2-dihydrocatechol 7, which is obtained by microbial oxidation of chlorobenzene, has been converted, via a sequence of reactions including ring-closing metathesis and Yamaguchi lactonisation steps, into the natural product (-)-cladospolide A (1).

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