Cas 81109-53-7,5-ethoxycarbonyl-4-oxo-N-phenyl-1,2-pentanedicarboximide

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Check Digit Verification of cas no

The CAS Registry Mumber 81109-53-7 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 8,1,1,0 and 9 respectively; the second part has 2 digits, 5 and 3 respectively.
Calculate Digit Verification of CAS Registry Number 81109-53:
(7*8)+(6*1)+(5*1)+(4*0)+(3*9)+(2*5)+(1*3)=107
107 % 10 = 7
So 81109-53-7 is a valid CAS Registry Number.

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81109-53-7Relevant academic research and scientific papers

STUDIES ON KETENE AND ITS DERIVATIVES. CVI. PHOTOREACTION OF DIKETENE WITH N-PHENYLMALEIMIDE AND DIMETHYL-N-PHENYLMALEIMIDE

Chiba, Takuo,Tsuchiya, Susumu,Kato, Tetsuzo

, p. 3715 - 3720 (2007/10/02)

Photoreaction of diketene with N-phenylmaleimide (2) and its dimethylderivative 3 gave rel-(4R,5S,6S)- and rel-(4R,5R,6R)-2-oxo-1-oxaspiroheptane-5,6-dicarboximides (4a and 4b) and their dimethyl derivatives 5a and 5b, respectively.Alcoholysis of com

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