1a, Me 1b, Ph 1c) each react differently with B(C6F5)3. For 1a (R = Me3Si) a bond cleavage of the central carbon−carbon double bond of the cyclocumulene was found, and the bis-σ-alkynyl complex Cp*2Zr(σ-C⋮CSiMe3)2 (2) was formed. This reaction occurred with 10% B(C6F5)3, giving after 6 days a quantitative yield of complex 2. With 1b (R = Me) B(C6F5)3 attacks the β-C atom of the starting cumulene and
五元zirconacyclocumulenes的CP * 2的Zr(η 4 -1,2,3,4- RC 4 R)(CP * =η 5 -五甲基,R =我3的Si 1A中,Me 1B中,Ph 1C)的每个不同的反应与B(C 6 F 5)3。对于1a(R = Me 3 Si),发现环
枯烯的中心碳-碳双键断裂,并且双σ-炔基络合物CP * 2 Zr(σ-C⋮CSiMe 3)2(2)成立了。该反应在10%B(C 6F 5)3,在6天后得到定量的配合物2。与图1b(R = Me)的B(C 6 ˚F 5)3次攻击起始cumulene的β-C原子以及C 4链保持完整,在形成的CP * 2的Zr η 3 -1,3,4-C( Me)-C [B(C 6 F 5)3 ] -C⋮CMe}(3)在位置处带有hex-2-en-4-yn-2-yl-3- [三(
五氟苯基)
硼酸酯]
配体全甲基
锆茂中心。在1c(R = Ph)的情况下,C