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201804-22-0

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201804-22-0 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 201804-22-0 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,0,1,8,0 and 4 respectively; the second part has 2 digits, 2 and 2 respectively.
Calculate Digit Verification of CAS Registry Number 201804-22:
(8*2)+(7*0)+(6*1)+(5*8)+(4*0)+(3*4)+(2*2)+(1*2)=80
80 % 10 = 0
So 201804-22-0 is a valid CAS Registry Number.

201804-22-0Relevant articles and documents

Arabinose-derived ketones as catalysts for asymmetric epoxidation of alkenes

Shing, Tony K. M.,Leung, Gulice Y. C.,Luk, To

, p. 7279 - 7289 (2007/10/03)

Readily available arabinose-derived ketones, containing a tunable butane-2,3-diacetal as the steric blocker, displayed increasing enantioselectivity (up to 90% ee) with the size of the acetal alkyl group in catalytic asymmetric epoxidation of trans-disubstituted and trisubstituted alkenes. The stereochemical communication between our ketone catalysts and the alkene substrates is mainly due to steric effect, and electronic effect involving π-π interaction between phenyl groups of substrate and of catalyst did not appear to be operative in our system.

Improved procedure for Julia-Colonna asymmetric epoxidation of α,β-unsaturated ketones: Total synthesis of diltiazem and Taxol side-chain

Adger, Brian M.,Barkley, James V.,Bergeron, Sophie,Cappi, Michael W.,Flowerdew, Benjamin E.,Jackson, Mark P.,McCague, Ray,Nugent, Thomas C.,Roberts, Stanley M.

, p. 3501 - 3507 (2007/10/03)

Poly-L-leucine catalyses the asymmetric epoxidation of enones 1-6 efficiently in a non-aqueous medium to provide the epoxy ketones 7-12 (70-91% yield; 80 to ≥95% ee). The strategy was used to make diltiazem 16 and the Taxol side chain 23 in single enantiomer form.

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