131721-23-8 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 131721-23-8 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,3,1,7,2 and 1 respectively; the second part has 2 digits, 2 and 3 respectively.
Calculate Digit Verification of CAS Registry Number 131721-23:
(8*1)+(7*3)+(6*1)+(5*7)+(4*2)+(3*1)+(2*2)+(1*3)=88
88 % 10 = 8
So 131721-23-8 is a valid CAS Registry Number.
131721-23-8Relevant articles and documents
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Durand, Thierry,Savignac,Girard, Jean-Pierre,Escale, Roger,Rossi, Jean-Claude
, p. 4131 - 4134 (2007/10/02)
The simultaneous addition to a suspension of HNa in THF at 50°C of β ketophosphonates, 5 or 6 (obtained by acylation of cupromethyl phosphonate 2) in the Horner-Wadsworth-Emmons reactions and saturated aldehydes provides good yields of α,β-unsaturated ket