193003-77-9 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 193003-77-9 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,9,3,0,0 and 3 respectively; the second part has 2 digits, 7 and 7 respectively.
Calculate Digit Verification of CAS Registry Number 193003-77:
(8*1)+(7*9)+(6*3)+(5*0)+(4*0)+(3*3)+(2*7)+(1*7)=119
119 % 10 = 9
So 193003-77-9 is a valid CAS Registry Number.
193003-77-9Relevant articles and documents
A synthesis of α-cuparenone based on symmetry considerations
Ho, Tse-Lok,Chang, May-Hua
, p. 621 - 624 (1997)
A ring expansion approach to α-cuparenone was accomplished in 5 or 6 steps. The key intermediate is 3-methyl-3-(4-methylphenyl)cyclobutanone, which was derived from a [2-t-2]cycloaddition of dichloroketene on a styrene derivative, followed by dechlorinati