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91099-05-7

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91099-05-7 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 91099-05-7 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 9,1,0,9 and 9 respectively; the second part has 2 digits, 0 and 5 respectively.
Calculate Digit Verification of CAS Registry Number 91099-05:
(7*9)+(6*1)+(5*0)+(4*9)+(3*9)+(2*0)+(1*5)=137
137 % 10 = 7
So 91099-05-7 is a valid CAS Registry Number.

91099-05-7Downstream Products

91099-05-7Relevant articles and documents

Central Nervous System Active Compounds. XIV On the Cyclization of N-Acyl-N'-arylureas

Heinicke, Grant,Hung, Tran V.,Prager, Rolf H.,Ward, A. David

, p. 831 - 844 (2007/10/02)

The cyclization of N-acyl-N'-arylureas in polyphosphoric acid has been reinvestigated.The product is not only the 4-substituted quinazolin-2(1H)-one as reported, but also contains the 2-acylaniline in major proportions.Two minor products have also been isolated.At 80 deg, an intermediate has been detected, the properties of which are consistent with it being the corresponding 2-acylphenylurea.Acyl ureas with strongly electron-withdrawing acyl groups from major amount of the corresponding anilide by the formal loss of cyanic acid.The application of this reaction tothe synthesis of quinazolinylphthalides has been investigated.

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