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251961-48-5

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251961-48-5 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 251961-48-5 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,5,1,9,6 and 1 respectively; the second part has 2 digits, 4 and 8 respectively.
Calculate Digit Verification of CAS Registry Number 251961-48:
(8*2)+(7*5)+(6*1)+(5*9)+(4*6)+(3*1)+(2*4)+(1*8)=145
145 % 10 = 5
So 251961-48-5 is a valid CAS Registry Number.

251961-48-5Relevant articles and documents

Catalytic intramolecular addition of metal carbenes to remote furans

Doyle, Michael P.,Chapman, Brant J.,Hu, Wenhao,Peterson, Chad S.,McKervey, M. Anthony,Garcia, Concepcion F.

, p. 1327 - 1329 (2008/02/09)

(formula presented) Diazo esters and diazo ketones linked to a furan undergo catalytic intramolecular addition of an intermediate metal carbene to the remote furan to form diendiones with ring sizes up to 17. Regioselectivity is catalyst dependent with addition to either the more or less substituted double bond. The high product yields and absence of need for high dilution suggest that this methodology is general for macrocycle preparations.

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