639516-89-5 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 639516-89-5 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 6,3,9,5,1 and 6 respectively; the second part has 2 digits, 8 and 9 respectively.
Calculate Digit Verification of CAS Registry Number 639516-89:
(8*6)+(7*3)+(6*9)+(5*5)+(4*1)+(3*6)+(2*8)+(1*9)=195
195 % 10 = 5
So 639516-89-5 is a valid CAS Registry Number.
639516-89-5Relevant articles and documents
A convenient and applicable route to synthesize 2-(1-alkynyl) phenylphosphonates
Peng, Ai-Yun,Zhang, Xin-Ying,Ding, Yi-Xiang
, p. 529 - 534 (2005)
A convenient and applicable route has been developed to synthesize various 2-(1-alkynyl)-phenylphosphonates starting from easily available phenols via palladium-catalyzed alkynyl dehydroxylation of 2-hydroxylphenylphosphonates.