158705-20-5 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 158705-20-5 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,5,8,7,0 and 5 respectively; the second part has 2 digits, 2 and 0 respectively.
Calculate Digit Verification of CAS Registry Number 158705-20:
(8*1)+(7*5)+(6*8)+(5*7)+(4*0)+(3*5)+(2*2)+(1*0)=145
145 % 10 = 5
So 158705-20-5 is a valid CAS Registry Number.
158705-20-5Relevant articles and documents
Synthesis of 3-Hydroxy-4,5-dimethyl-2(5H)-furanone and its analogues; utilisation of an intramolecular darzens reaction
Frater,Mueller
, p. 2753 - 2756 (2007/10/02)
The intramolecular Darzens reaction of chloroacetates of hydroxy ketones leads to α, β-epoxy-γ-and δ-lactones. Acid catalysed rearrangement of the latter furnished the α-keto lactones 1, 10, 16 and 20.