Abstract
Dimethyl acetylenedicarboxylate (RC2R) reacted with the zerovalent dibenzylideneacetone (dba) palladium complexes to give the palladacyclopentadiene, [Pd(C4R4)]n, characterised as the adducts Pd(C4R4)L2[L = Ph3P, (PhO)3P, p-toluidine; L2= Ph2PCH2CH2PPh2, bipy and phen]. [Pd(C4R4)]n reacted with bromine to give Br(CR)4Br, with air and Pd(PhCN)2Cl2 to give the furan R4C4O, and with acetylenes R′C2R′to give the benzenes R4R′2C6(R′= COOMe or Ph). The platinum analogue, [Pt(C4R4)]n, has also been detected and was characterised as [Pt(C4R4)(Ph3P)2]. The mechanism of the formation of the metallacyclopentadienes and benzenes is discussed.
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