Higher temperatures are less preferred because they may lead to {HEAD ~ undesirable reactions} such as {TAIL ~ carbon loss} through reaction with oxygen 
such as
Higher temperatures are less preferred because they may lead to { HEAD ~ undesirable reactions } such as { TAIL ~ carbon loss } through reaction with oxygen
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH