In {HEAD ~ certain embodiments}, the ω halo 1,2 alkanediol is {TAIL ~ a 3 halo 1,2 propanediol} 
In { HEAD ~ certain embodiments } , the ω halo 1,2 alkanediol is { TAIL ~ a 3 halo 1,2 propanediol }
OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL