205177-21-5 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 205177-21-5 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,0,5,1,7 and 7 respectively; the second part has 2 digits, 2 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 205177-21:
(8*2)+(7*0)+(6*5)+(5*1)+(4*7)+(3*7)+(2*2)+(1*1)=105
105 % 10 = 5
So 205177-21-5 is a valid CAS Registry Number.
205177-21-5Relevant articles and documents
A short conversion of cyclohexanones to cycloheptenones
Yang, Shangjin,Hungerhoff, Benno,Metz, Peter
, p. 2097 - 2098 (1998)
Cycloheptenones are efficientliy prepared from cyclohexanones via organoaluminumpromoted ring enlargement with trimethylsilyldiazomethane and subsequent palladium(II)-catalyzed dehydrosilylation.