It appears that the hydroxyls on the oxyalkylene, etc., groups react more readily with such isocyanates; thus, {TAIL ~ a lower molar ratio} of isocyanate reacted with the base oxylalkylenated aminophenol should first produce urethanes on {HEAD ~ the oxyalkylene moieties} with the phenol hydroxyl reacting more readily as greater amounts of isocyanate are added 
It appears that the hydroxyls on the oxyalkylene , etc . , groups react more readily with such isocyanates ; thus , { TAIL ~ a lower molar ratio } of isocyanate reacted with the base oxylalkylenated aminophenol should first produce urethanes on { HEAD ~ the oxyalkylene moieties } with the phenol hydroxyl reacting more readily as greater amounts of isocyanate are added
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH