171667-57-5 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 171667-57-5 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,7,1,6,6 and 7 respectively; the second part has 2 digits, 5 and 7 respectively.
Calculate Digit Verification of CAS Registry Number 171667-57:
(8*1)+(7*7)+(6*1)+(5*6)+(4*6)+(3*7)+(2*5)+(1*7)=155
155 % 10 = 5
So 171667-57-5 is a valid CAS Registry Number.
171667-57-5Relevant articles and documents
Highly Chemoselective Triple Bond Reductions on Unsymmetrical 1,4-Diorganyl-1,3-Butadiynes
Dabdoub, Miguel J.,Dabdoub, Vania B.
, p. 9839 - 9850 (1995)
Unsymmetrical 1,4-diorganyl-1,3-butadiynes 1a-g undergo regio-, stereo- and chemoselective addition of butyltellurolate anion leading to (Z)-1-butyltelluro-1,4-bis(organyl)but-1-en-3-ynes 2a-g in good yields.The terminal triple bond reacts faster than the