phenylacetylene before completing the transformation from 3 to 4. The reaction leads to Rh(E)–CH═CHPh}(C≡CPh)2κ3-P,O,P-[xant(PiPr2)2]} (5), which reductively eliminates (E)-1,4-diphenyl-1-buten-3-yne to regenerate 3. Complexes 3, 4, and 5 constitute a cycle for head-to-head dimerization of phenylacetylene. Consequently, complex 1 promotes the catalytic homocoupling of terminal alkynes to (E)-enynes, including
苯乙炔的 C-C 三键经历 RhHκ 3 -P,O,P-[xant(PPr 2 ) 的 Rh-H 键的反马尔可夫尼科夫加成 2 ]} (1; xant(PPr 2 ) 2 = 9,9-二甲基-4,5-双(
二异丙基膦)呫吨) 得到 Rh (E)–CH=CHPh}κ 3 -P,O,P-[xant(PPr 2 ) 2 ]} (2),与第二个炔分子反应生成 Rh(CeqCPh)κ 3 -P,O,P-[xant(PPr 2 ) 2 ]} (3) 和
苯乙烯在从1到2的转变完成之前。 3的
金属中心与另一个炔分子的C(sp)–H键氧化加成,生成RhH(C≡CPh) 2 κ 3 -P,O ,P-[xant(PPr 2 ) 2 ]} (4),在完成从 3 到 4 的转变之前,它还会与更多的
苯乙炔反应。该反应生成 Rh( E)–CH=CHPh}(C=CPh) 2 κ 3 -P,O,P-[xant(PPr