PREPARATION OF ETA-1-1,3-DIENYL, ETA-1-1,2-DIENYL AND ETA-3-CYCLOBUTENONE COMPLEXES VIA REACTIONS OF TRANSITION-METAL CARBONYL-CONTAINING ANIONS WITH ALLENIC ELECTROPHILES

The preparation and reaction chemistry of 1,3- and 1,2-diene and relat ed complexes derived from metal carbonyl containing anions and allenic electrophiles are addressed. The preparation of some CpFe(CO)2 eta1-d iene complexes and their conversion into CpFe(CO) eta3-diene complexes is presented followed by reactions of CPMO(CO)3-, CpW(CO)3- and CpMo( CO)2PR3- anions with allenic electrophiles which produce metal complex ed cyclobutenones (via CO and alkene insertions from the initially for med product) and 1,2-diene complexes, respectively. Lastly, the reacti ons of PPh3(CO)3Co- anions with allenic electrophiles are outlined whi ch result in several different coordination geometries depending on th e reaction conditions used.