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259817-06-6

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259817-06-6 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 259817-06-6 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,5,9,8,1 and 7 respectively; the second part has 2 digits, 0 and 6 respectively.
Calculate Digit Verification of CAS Registry Number 259817-06:
(8*2)+(7*5)+(6*9)+(5*8)+(4*1)+(3*7)+(2*0)+(1*6)=176
176 % 10 = 6
So 259817-06-6 is a valid CAS Registry Number.

259817-06-6Relevant articles and documents

Organophosphorus compounds. Part 144: A novel approach to 1,3- oxaphospholes from phosphaalkynes and isomunchnones

Ruf, Sven G.,Bergstr??er, Uwe,Regitz, Manfred

, p. 63 - 70 (2007/10/03)

Phosphaalkynes 5 react with the isomunchnones 12 in a regiospecific process to furnish the 1,3-oxaphospholes 14. In contrast to other cycloadditions to isomunchnones, the bicyclic intermediate 13 cannot be detected in these reactions. It is not necessary to use isolated isomunchnones 12 for the synthesis of the 1,3-oxaphospholes. The reaction sequence is also successful by use of the diazocarbonyl compounds 11 and in situ generation of the isomunchnones therefrom.

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