Cas 117489-33-5,2-methyl-4-phenyl-5-oxo-4H-indeno<1,2-b>pyran

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Check Digit Verification of cas no

The CAS Registry Mumber 117489-33-5 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,1,7,4,8 and 9 respectively; the second part has 2 digits, 3 and 3 respectively.
Calculate Digit Verification of CAS Registry Number 117489-33:
(8*1)+(7*1)+(6*7)+(5*4)+(4*8)+(3*9)+(2*3)+(1*3)=145
145 % 10 = 5
So 117489-33-5 is a valid CAS Registry Number.

117489-33-5Upstream product

1785-98-4 4-(indan-1',3'-dion-2'-yl)-4-phenyl-2-butanone

117489-33-5Downstream Products

117489-33-5Relevant academic research and scientific papers

Foramtion of 5-Oxoindenopyran Derivatives in Cyclization of 1,5-Diketones of the Indan-1,3-dione Series

Lusis, V. K.,Liepin'sh, E. E.,Mutsenietse, D. Kh.,Dubur, G. Ya.

, p. 145 - 150 (1988)

Indenopyrans, including 2-methylene and 2-acetoxy derivatives of 3-ethoxycarbonyl-4-phenyl-5-oxo-3,4-dihydroindenopyran, are formed in the cyclization of 4-(indan-1',3'-dion-2'-yl)-4-phenyl-2-butanone and its 3-ethoxycarbonyl derivative in a

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