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168102-00-9

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168102-00-9 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 168102-00-9 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,6,8,1,0 and 2 respectively; the second part has 2 digits, 0 and 0 respectively.
Calculate Digit Verification of CAS Registry Number 168102-00:
(8*1)+(7*6)+(6*8)+(5*1)+(4*0)+(3*2)+(2*0)+(1*0)=109
109 % 10 = 9
So 168102-00-9 is a valid CAS Registry Number.

168102-00-9Relevant articles and documents

δ,ε-Unsaturated β,β-Difluoro-α-keto Esters: Novel Synthesis and Utility as Precursors of β,β-Difluoro-α-amino Acids

Shi, Guo-qiang,Cai, Wei-ling

, p. 6289 - 6295 (2007/10/03)

Treatment of the hemiketals 6 formed from ethyl trifluoropyruvate and primary allylic alcohols with SOCl2 and pyridine readily afforded a number of α-chloro-β,β-trifluorolactyl allyl ethers 2.Subsequent reductive dechlorofluorination from 2 led to the formation of allyl-substituted difluoroenol pyruvyl ethers 3 whose Claisen rearrangement provided a convenient access to a variety of δ,ε-unsaturated β,β-difluoro-α-keto esters 4.As further transformation, direct conversion of β,β-difluoro-α-keto esters to the corresponding β,β-difluoro-α-amino acids was achieved by reductive amination of the corresponding α-keto acids with NH3*H2O/NaBH4.Furthermore, use of the prepared β,β-difluoro-α-keto ester 4a as a common precursor of other structurally related β,β-difluoro-α-amino acids was demonstrated by the synthesis of β,β-difluoroproline (18) and β,β-difluoroglutamic acid (23) through synthetic elaboration of its inherent double bond.

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