172223-24-4 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 172223-24-4 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,7,2,2,2 and 3 respectively; the second part has 2 digits, 2 and 4 respectively.
Calculate Digit Verification of CAS Registry Number 172223-24:
(8*1)+(7*7)+(6*2)+(5*2)+(4*2)+(3*3)+(2*2)+(1*4)=104
104 % 10 = 4
So 172223-24-4 is a valid CAS Registry Number.
172223-24-4Relevant articles and documents
The Reaction of Methyl (E)-4,5-Epoxypent-2-enoate with Acylcopper: the Unique Role of Boron Trifluoride in determining Regioselectivity
Nagumo, Shinji,Irie, Shigeyuki,Akita, Hiroyuki
, p. 2001 - 2002 (1995)
Excess BF3 causes regioselectivity reversion in the reaction of methyl 4,5-epoxypent-2-enoate 1 with Ph2CuLi; this is rationalised by a two step conversion via methyl 4-bromo-5-hydroxypent-2-enoate 5.
