77705-58-9 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 77705-58-9 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 7,7,7,0 and 5 respectively; the second part has 2 digits, 5 and 8 respectively.
Calculate Digit Verification of CAS Registry Number 77705-58:
(7*7)+(6*7)+(5*7)+(4*0)+(3*5)+(2*5)+(1*8)=159
159 % 10 = 9
So 77705-58-9 is a valid CAS Registry Number.
77705-58-9Relevant articles and documents
Fused Quinolines, IV: 5,11-Dihydrobenzothienoquinolin-11-ones, S,S-Dioxides and Products of Thionation
Goerlitzer, Klaus,Weber, Josef
, p. 76 - 84 (2007/10/02)
The amides 3 cyclize on heating with polyphosphoric acid (PPA) to yield the title compounds 4, from which the S,S-dioxides 6 are obtained by reaction with H2O2.The synthesis of the thiones 12 and of the thioethers 13 is described.