sp Carbon Chains Surrounded by sp<sup>3</sup> Carbon Double Helices: Directed Syntheses of Wirelike Pt(C⋮C)<i><sub>n</sub></i>Pt Moieties That Are Spanned by Two P(CH<sub>2</sub>)<i><sub>m</sub></i>P Linkages via Alkene Metathesis
作者:Laura de Quadras、Eike B. Bauer、Wolfgang Mohr、James C. Bohling、Thomas B. Peters、José Miguel Martín-Alvarez、Frank Hampel、John A. Gladysz
DOI:10.1021/ja071612n
日期:2007.7.1
termini-spanning diphosphines and trans,trans-(C6F5)(Ph2P(CH2)mPPh2)Pt(CC)nPt(Ph2P(CH2)mPPh2)(C6F5) with trans-spanning diphosphines (m = 2m' + 2; n = 4, 6). The latter (n = 4) are independently synthesized by similar metatheses/hydrogenations of 1a-d to give trans-(C6F5)(Ph2P(CH2)mPPh2)PtCl (49-59%), followed by analogous introductions of (CC)4 chains (66-77%). Crystal structures of complexes with termini-spanning
反式-(C6F5)(Ph2P(CH2)m'CH=CH2)2PtCl (1; m' = a, 6; b, 7; c, 8; d, 9; e, 10) 和 H(CC) 的反应2H (HNEt2, cat. CuI) 得到反式-(C6F5)(Ph2P(CH2)m'CH=CH2)2Pt(CC)2H(3a-e,80-95%)。3a-d 在干草条件下(O2,cat. CuCl/TMEDA,丙酮)的氧化同源偶联产生反式,反式-(C6F5)(Ph2P(CH2)m'CH=CH2)2Pt(CC)4Pt(Ph2P(CH2)m 'CH=CH2)2(C6F5)(4a-d,64-84%)。在 Hay 条件下用过量 HCCSiEt3 处理 3c-e 得到反式-(C6F5)(Ph2P(CH2)m'CH=CH2)2Pt(CC)3SiEt3 (56-73%)。同源偶联(n-Bu4N+ F-、Me3SiCl、Hay 条件)提供