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55520-53-1

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55520-53-1 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 55520-53-1 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 5,5,5,2 and 0 respectively; the second part has 2 digits, 5 and 3 respectively.
Calculate Digit Verification of CAS Registry Number 55520-53:
(7*5)+(6*5)+(5*5)+(4*2)+(3*0)+(2*5)+(1*3)=111
111 % 10 = 1
So 55520-53-1 is a valid CAS Registry Number.

55520-53-1Relevant articles and documents

Reactivity of 2H-1,2,3-Diazaphosphole Derivatives: Unexpected Formation of Indoles and New Indolization Reaction

Baccolini, Graziano,Todesco, Paolo E.

, p. 535 - 538 (2007/10/02)

2H-1,2,3-Diazaphosphole derivatives (1) react with alkyl halides to give the corresponding 2,3-disubstituted indoles (3) as the major products (30-40percent yields).Small amounts (15-20percent) of the ring-opened compounds (4) in the two diastereoisomeric Z-configuration are also obtained.During this reaction a cis-(1) trans-(1) isomerization is also observed.Mechanistic explanations of these results have been described and a new general method has been developed for the synthesis of 2,3-disubstituted indoles from ketone arylhydrazones and PCl3.

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