Scheme 3.
(i) triphos/NH4PF6; (ii) H2O/glacial MeCOOH; (iii) Ph2P(CH2)3NH2; (iv), (v) [PdCl2(PhCN)2], [PtCl2(PhCN)2], [PtMe2(COD)] as appropriate (there are no b type analogues of 3a and 4a).
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