99903-42-1 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 99903-42-1 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 9,9,9,0 and 3 respectively; the second part has 2 digits, 4 and 2 respectively.
Calculate Digit Verification of CAS Registry Number 99903-42:
(7*9)+(6*9)+(5*9)+(4*0)+(3*3)+(2*4)+(1*2)=181
181 % 10 = 1
So 99903-42-1 is a valid CAS Registry Number.
99903-42-1Relevant articles and documents
Synthesis of Bis(trifluoromethyl)-Substituted Pyrethroids
Mack, Helmut,Hanack, Michael
, p. 833 - 846 (2007/10/02)
A method for the preparation of 1,1-bis(trifluoromethyl)-substituted pyrethroids is described.For this purpose, 1,1-bis(trifluoromethyl)-substituted olefins 9 are prepared by an easy method from the aldehydes 17 with 2,2-dichlorohexafluoropropane (16) and