97971-75-0 Usage
Preparation
reparation from lin-parabenzotetraphenyl-–difurfuran by oxidation with chromium trioxide in refluxing acetic anhydride for >1 h, followed by saponification of the 2,5-dibenzoylhydroquinone dibenzo-ate so formed with potassium hydroxide in ethanol in a water bath for 30 min (43%).
Check Digit Verification of cas no
The CAS Registry Mumber 97971-75-0 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 9,7,9,7 and 1 respectively; the second part has 2 digits, 7 and 5 respectively.
Calculate Digit Verification of CAS Registry Number 97971-75:
(7*9)+(6*7)+(5*9)+(4*7)+(3*1)+(2*7)+(1*5)=200
200 % 10 = 0
So 97971-75-0 is a valid CAS Registry Number.
97971-75-0Relevant articles and documents
Facile synthesis of regio-isomeric naphthofurans and benzodifurans
Park, Kwanghee Koh,Jeong, Jinsuk
, p. 545 - 553 (2007/10/03)
Naphtho[1,2-b]furans 1a-f, naphtho[2,1-b]furans 2a-f, benzo[1,2-b:5,4- b′]difurans 3a-b, benzo[1,2-b:4,5-b′]difurans 4a-b, and benzo[1,2-b:4,3-b′]difurans 5a-b were synthesized by base-catalyzed cyclization reaction of the corresponding o-alkoxybenzoylarene derivatives. The o-alkoxybenzoylarenes were obtained from the etherification reaction of the o-hydroxybenzoylarenes, which were prepared either by the reaction of methoxyarenes with benzoyl chloride in the presence of aluminum chloride or by photo-Fries rearrangement of aryl benzoates. Graphical Abstract.
