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857537-50-9

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857537-50-9 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 857537-50-9 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 8,5,7,5,3 and 7 respectively; the second part has 2 digits, 5 and 0 respectively.
Calculate Digit Verification of CAS Registry Number 857537-50:
(8*8)+(7*5)+(6*7)+(5*5)+(4*3)+(3*7)+(2*5)+(1*0)=209
209 % 10 = 9
So 857537-50-9 is a valid CAS Registry Number.

857537-50-9Downstream Products

857537-50-9Relevant articles and documents

Atropo-enantioselective synthesis of the natural bicoumarin (+)-yisokotanin A via a configurationally stable biaryl lactone

Bringmann, Gerhard,Hinrichs, Juergen,Henschel, Petra,Kraus, Juergen,Peters, Karl,Peters, Eva-Maria

, p. 1096 - 1106 (2007/10/03)

The atropo-enantioselective total synthesis of the axially chiral bicoumarin (+)-isokotanin A (1) is described. Key steps were the formation of a configurationally stable seven-membered biaryl lactone and its kinetic resolution by atroposelective ring cleavage. The previous assignment of the absolute configuration of (+)-isokotanin A (1) (and its synthetic precursors) was confirmed by quantum chemical CD calculations. Wiley-VCH Verlag GmbH, 69451 Weinheim, Germany, 2002.

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