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189894-04-0

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189894-04-0 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 189894-04-0 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,8,9,8,9 and 4 respectively; the second part has 2 digits, 0 and 4 respectively.
Calculate Digit Verification of CAS Registry Number 189894-04:
(8*1)+(7*8)+(6*9)+(5*8)+(4*9)+(3*4)+(2*0)+(1*4)=210
210 % 10 = 0
So 189894-04-0 is a valid CAS Registry Number.

189894-04-0Relevant articles and documents

Catalytic oxidations of steroid substrates by artificial cytochrome p-450 enzymes.

Yang, Jerry,Gabriele, Bartolo,Belvedere, Sandro,Huang, Ying,Breslow, Ronald

, p. 5057 - 5067 (2007/10/03)

Catalysts comprising manganese-porphyrins carrying cyclodextrin binding groups are able to perform hydroxylations with substrate selectivity and regio- and stereoselectivity and high catalytic turnovers. The geometries of the catalyst/substrate complexes override intrinsic substrate reactivities, permitting attack on geometrically accessible saturated carbons of steroids in the presence of secondary carbinol groups and carbon-carbon double bonds, as in enzymatic reactions. Selective hydroxylations of steroid carbon 9 positions are of particular practical interest.

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