when n is 0 and M is palladium, Q represent π allyl, and {HEAD ~ Y} represents ClO4, PF6, or {TAIL ~ BF4} 
when n is 0 and M is palladium , Q represent π allyl , and { HEAD ~ Y } represents ClO4 , PF6 , or { TAIL ~ BF4 }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL