173218-39-8 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 173218-39-8 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,7,3,2,1 and 8 respectively; the second part has 2 digits, 3 and 9 respectively.
Calculate Digit Verification of CAS Registry Number 173218-39:
(8*1)+(7*7)+(6*3)+(5*2)+(4*1)+(3*8)+(2*3)+(1*9)=128
128 % 10 = 8
So 173218-39-8 is a valid CAS Registry Number.
173218-39-8Relevant articles and documents
Total Synthesis of Milbemycin G: Assembly and Completion of the Synthesis
Bailey, Simon,Teerawutgulrag, Aphiwat,Thomas, Eric J.
, p. 2521 - 2522 (1995)
The Wittig reaction between phosphonium salt 1 and the hydroxybutenolide 2 followed by deprotection, macrocyclisation, and reduction gives the 6-hydroxymilbemycin E 9 which by further cyclisation is converted into milbemycin G 11.