117663-49-7 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 117663-49-7 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,1,7,6,6 and 3 respectively; the second part has 2 digits, 4 and 9 respectively.
Calculate Digit Verification of CAS Registry Number 117663-49:
(8*1)+(7*1)+(6*7)+(5*6)+(4*6)+(3*3)+(2*4)+(1*9)=137
137 % 10 = 7
So 117663-49-7 is a valid CAS Registry Number.
117663-49-7Relevant articles and documents
Synthesis of 4-(2-Benzofuranyl)coumarins
Deshpande, A. R.,Joshi, U. K.,Paradkar, M. V.
, p. 524 - 526 (2007/10/02)
4-(2-Benzofuranyl)coumarins (3) have been synthesized by two routes, one involving Pechmann condensation of benzofuranpropionic acid-β-oxo-ethyl ester with phenols and the other involving Wittig reaction on 2-(2-hydroxybenzoyl)benzofuran using Ph3P=CHCOOE