140239-18-5 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 140239-18-5 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,4,0,2,3 and 9 respectively; the second part has 2 digits, 1 and 8 respectively.
Calculate Digit Verification of CAS Registry Number 140239-18:
(8*1)+(7*4)+(6*0)+(5*2)+(4*3)+(3*9)+(2*1)+(1*8)=95
95 % 10 = 5
So 140239-18-5 is a valid CAS Registry Number.
140239-18-5Relevant articles and documents
Efficient procedure to 4-carbethoxy-3-trifluoro methylcyclohex-2-enone and 4-alkylated derivatives
Begue,Bonnet-Delpon,Dogbeavou
, p. 573 - 579 (2007/10/02)
The 4-carbethoxy-3-trifluoromethylcyclohex-2-enone 1a was prepared in one-pot procedure in 90% yield, from ethyl trifluoroacetoacetate (ETFAAE) and methylvinyl ketone. This reaction has been extended to alkylated ethyl trifluoroacetoacetate.
