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207298-22-4

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207298-22-4 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 207298-22-4 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,0,7,2,9 and 8 respectively; the second part has 2 digits, 2 and 2 respectively.
Calculate Digit Verification of CAS Registry Number 207298-22:
(8*2)+(7*0)+(6*7)+(5*2)+(4*9)+(3*8)+(2*2)+(1*2)=134
134 % 10 = 4
So 207298-22-4 is a valid CAS Registry Number.

207298-22-4Relevant articles and documents

Total synthesis of epothilone D by sixfold ring cleavage of cyclopropanol intermediates

Hurski, Alaksiej L.,Kulinkovich, Oleg G.

experimental part, p. 3497 - 3500 (2010/09/05)

The ring-opening or ring fragmentation reactions of cyclopropanol intermediates are used in the total synthesis of epothilone D for the creation of trisubstituted double bonds, an ethyl ketone functionality, as well as for the protection of carboxylic and ester groups. Epothilone D is obtained in 1.6% overall yield (24 steps in the longest linear sequence) starting from (R)-methyl 2,3-O-isopropylideneglycerate. The key cyclopropanol intermediates are efficiently obtained by titanium(IV)-catalyzed reactions of readily available esters with Grignard reagents. Crown Copyright

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