Transition metal–carbon bonds. Part XXXV. Internal metallation of t-butyldi-o-tolylarsine and di-t-butyl-o-tolylarsine by platinum

Abstract
T-Butyldi-o-tolylarsine (L′) and di-t-butyl-o-tolylarsine (L″) have been prepared. K2PtCl4 with L′(2 mol) gives trans-[PtCl2L′2] but when PtCl2(PhCN)2 was treated with L′(2 mol proportions) in boiling n-propanol the mono-metallated species [PtCl(As′–C)L′] was formed. With one mole proportion of L′PtCl2(PhCN)2 gives the chloro-bridged species [Pt2Cl2(As′–C)2], [As′–Co(t-butyl-o-tolylarsino)benzyl]. The complexes [Pt2(acetate)2-(As′–C)2], [Pt2(benzoate)2(As′–C)2], [Pt(acac)(As′–C)], and [PtCl(As′–C)Q](Q = pyridine, PMe2Ph, or AsMe2Ph) and [Pt(As′–C)(PMe2Ph)2]Cl were prepared. On heating [PtCl2(PhCN)2] with L″[Pt2Cl2(As′–C)2] forms {As″–CBut 2AsC6H3CH2–}. Palladium complexes trans-[PdCl2L′2] and trans-[PdCl2L″2] were also prepared but could not be induced to internally metallate. 1H n.m.r. and i.r. data are given.

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