142646-71-7 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 142646-71-7 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,4,2,6,4 and 6 respectively; the second part has 2 digits, 7 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 142646-71:
(8*1)+(7*4)+(6*2)+(5*6)+(4*4)+(3*6)+(2*7)+(1*1)=127
127 % 10 = 7
So 142646-71-7 is a valid CAS Registry Number.
142646-71-7Relevant academic research and scientific papers
Synthesis of meso-tetraalkynyl porphyrins using 1-seleno-2-alkynyl cation precursors
Proess,Pankert,Hevesi
, p. 269 - 272 (2007/10/02)
The strongly regioselective reaction of the silver perchlorate activated selenoacetals derived from 2-butynal and 3-phenylpropynal with pyrrole allows for a straightforward synthesis of the corresponding title compounds but the yields are low.
