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198208-51-4

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198208-51-4 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 198208-51-4 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,9,8,2,0 and 8 respectively; the second part has 2 digits, 5 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 198208-51:
(8*1)+(7*9)+(6*8)+(5*2)+(4*0)+(3*8)+(2*5)+(1*1)=164
164 % 10 = 4
So 198208-51-4 is a valid CAS Registry Number.

198208-51-4Downstream Products

198208-51-4Relevant articles and documents

Chiral fluoro ketones for catalytic asymmetric epoxidation of alkenes with oxone

Denmark, Scott E.,Matsuhashi, Hayao

, p. 3479 - 3486 (2007/10/03)

Two structurally dissimilar, chiral fluoro ketones have been prepared and their potential as enantioselective catalysts for asymmetric epoxidation with Oxone has been evaluated. The tropinone-based ketone (-)-5 was easily prepared and showed excellent reactivity but only modest enantioselectivity. The biphenyl-based ketone (-)-6 was prepared in a somewhat lengthy synthesis (along with its monofluoro and geminal fluoro analogues). This ketone exhibited only modest reactivity; 30 mol % of (-)-6 was needed to bring about complete conversion in a reasonable time. The enantioselectivity of this catalyst was generally much higher, but again very substrate dependent.

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