129256-97-9 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 129256-97-9 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,2,9,2,5 and 6 respectively; the second part has 2 digits, 9 and 7 respectively.
Calculate Digit Verification of CAS Registry Number 129256-97:
(8*1)+(7*2)+(6*9)+(5*2)+(4*5)+(3*6)+(2*9)+(1*7)=149
149 % 10 = 9
So 129256-97-9 is a valid CAS Registry Number.
129256-97-9Relevant academic research and scientific papers
Synthesis of 2-Oxo-2H-pyran-5-carboxylate Derivatives
Kvita, Vratislav
, p. 411 - 416 (2007/10/02)
3-Substituted diethyl pent-2-enedioates are easily formylated by means of ethyl formate/TiCl4/4-methylmorpholine to produce the ethoxymethylene derivatives, which are smoothly cyclized either with HCOOH or PPA to the corresponding 2-oxo-2H-pyran-5-carboxylate derivatives.
