18639-93-5 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 18639-93-5 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 1,8,6,3 and 9 respectively; the second part has 2 digits, 9 and 3 respectively.
Calculate Digit Verification of CAS Registry Number 18639-93:
(7*1)+(6*8)+(5*6)+(4*3)+(3*9)+(2*9)+(1*3)=145
145 % 10 = 5
So 18639-93-5 is a valid CAS Registry Number.
18639-93-5Relevant articles and documents
RING SIZE EFFECTS ON THE GAS PHASE PROTONATION OF CYCLIC KETONES
Bouchoux, G.,Houriet, R.
, p. 5755 - 5758 (2007/10/02)
Experimental proton affinities of cyclic ketones are determined showing evidence for a larger strain energy in protonated vs. neutral cyclic ketones.