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181937-81-5

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181937-81-5 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 181937-81-5 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,8,1,9,3 and 7 respectively; the second part has 2 digits, 8 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 181937-81:
(8*1)+(7*8)+(6*1)+(5*9)+(4*3)+(3*7)+(2*8)+(1*1)=165
165 % 10 = 5
So 181937-81-5 is a valid CAS Registry Number.

181937-81-5Downstream Products

181937-81-5Relevant articles and documents

Synthesis and reactions of 3-aroyl derivatives of 4-hydroxy-2-quinolones and 4-hydroxycoumarin

Kappe, Thomas,Schnell, Barbara

, p. 663 - 670 (2007/10/03)

3-Aroyl-4-hydroxy-2-quinolones 4 and 11 can be synthesized starting with 1 or 9 via Fries rearrangement of the corresponding esters 3 and 10, catalyzed by potassium cyanide and 18-crown-6. A one pot procedure is presented in which the esters do not need to be isolated. Reduction of the aryl ketones 4 and 11 with zinc dust leads to the benzyl derivatives 5 and 12. Reaction of the aryl ketones 4 and 11 with hydroxylamine and subsequent heating of the crude product leads via thermal Beckmann rearrangement and dehydration to oxazoloquinolones 7 and 14. 2-Aroyloxypyrido[1,2-a]pyrimidin-4-ones 17 and 20 could not be converted to the corresponding ketones by Fries rearrangement.

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