868840-71-5 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 868840-71-5 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 8,6,8,8,4 and 0 respectively; the second part has 2 digits, 7 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 868840-71:
(8*8)+(7*6)+(6*8)+(5*8)+(4*4)+(3*0)+(2*7)+(1*1)=225
225 % 10 = 5
So 868840-71-5 is a valid CAS Registry Number.
868840-71-5Relevant articles and documents
Narrow-rim functionalization of calix[4]arenes via Sonogashira coupling reactions
Al-Saraierh, Hassan,Miller, David O.,Georghiou, Paris E.
, p. 8273 - 8280 (2005)
The narrow (or "lower")-rim hydroxyl groups of calixarenes are known to be resistant to substitution/ displacement. The Sonogashira coupling reaction with TMSA and phenylacetylene, however, has now been extended to the bistriflate of p-tert-butylcalix[4]a
