129256-92-4 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 129256-92-4 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 2 respectively.
Calculate Digit Verification of CAS Registry Number 129256-92:
(8*1)+(7*2)+(6*9)+(5*2)+(4*5)+(3*6)+(2*9)+(1*2)=144
144 % 10 = 4
So 129256-92-4 is a valid CAS Registry Number.
129256-92-4Relevant 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.
