The preferred practice of {TAIL ~ the Collins method} is to use a mole ratio of {HEAD ~ complexing agent} to Zr that is similar to the mole ratio of organic base to Zr 
The preferred practice of { TAIL ~ the Collins method } is to use a mole ratio of { HEAD ~ complexing agent } to Zr that is similar to the mole ratio of organic base to Zr
OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH