Cas 54552-89-5,2-phenyl-isophosphindole-1,3-dione

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Check Digit Verification of cas no

The CAS Registry Mumber 54552-89-5 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 5,4,5,5 and 2 respectively; the second part has 2 digits, 8 and 9 respectively.
Calculate Digit Verification of CAS Registry Number 54552-89:
(7*5)+(6*4)+(5*5)+(4*5)+(3*2)+(2*8)+(1*9)=135
135 % 10 = 5
So 54552-89-5 is a valid CAS Registry Number.

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54552-89-5Relevant articles and documents

Cyclic Carboxylic Monophosphides: A New Class of Phosphorus Heterocycle

Barron, Andrew R.,Hall, Stephen W.,Cowley, Alan H.

, p. 1753 - 1755 (2007/10/02)

Bis(trimethylsilyl)phosphines, RP(SiMe3)2 (R=Ph, But), react with di-acid chlorides or the corresponding acid anhydrides to afford cyclic carboxylic monophosphides featuring five-, six-, or seven-membered phosphorus-containing rings; the reaction chemistry of the five-membered ring is discussed.

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54552-89-5