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217090-70-5

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217090-70-5 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 217090-70-5 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,1,7,0,9 and 0 respectively; the second part has 2 digits, 7 and 0 respectively.
Calculate Digit Verification of CAS Registry Number 217090-70:
(8*2)+(7*1)+(6*7)+(5*0)+(4*9)+(3*0)+(2*7)+(1*0)=115
115 % 10 = 5
So 217090-70-5 is a valid CAS Registry Number.

217090-70-5Relevant articles and documents

Lewis acid-promoted carbonyl addition of lithium (α- carbalkoxyvinyl)cuprates to aldehydes provides a novel asymmetric synthesis of β,β-disubstituted α-(hydroxyalkyl)acrylates

Wei, Han-Xun,Willis, Steven,Li, Guigen

, p. 8203 - 8206 (2007/10/03)

A new anionic addition process has been developed for the asymmetric synthesis of unusual Baylis-Hillman adducts, β,β-disubstituted α- (hydroxyalkyl)acrylates. The new process involves conjugate addition of R2CuLi to β-substituted α,β-acetylenic ester to give lithium (α- carbalkoxyvinyl)cuprate which was then subjected to the carbonyl addition to aldehyde promoted by Et2AlCl. Modest to good diastereoselectivity (50.0- 87.7%de) has been obtained by using (1R,2S,5R)-(-)-menthol as the chiral auxiliary (59.0-94.0% yield). The absolute configuration was unambiguously assigned by transforming the product to methyl (R)-α-methoxyphenylacetate.

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