Room Temperature Dehydrogenation of Ethane, Propane, Linear Alkanes C4–C8, and Some Cyclic Alkanes by Titanium–Carbon Multiple Bonds
作者:Marco G. Crestani、Anne K. Hickey、Xinfeng Gao、Balazs Pinter、Vincent N. Cavaliere、Jun-Ichi Ito、Chun-Hsing Chen、Daniel J. Mindiola
DOI:10.1021/ja4060178
日期:2013.10.2
to form isolable α-olefin complexes of the type, [(PNP)Ti(η(2)-H2C═CHR)(CH2(t)Bu)] (R = CH3 (2), CH2CH3 (3), (n)Pr (4), and (n)Bu (5)). Complexes 1-5 can be independently prepared from [(PNP)Ti═CH(t)Bu(OTf)] and the corresponding alkylating reagents, LiCH2CHR (R = H, CH3(unstable), CH2CH3, (n)Pr, and (n)Bu). Olefin complexes 1 and 3-5 have all been characterized by a diverse array of multinuclear NMR
瞬态钛新戊炔,[(PNP)Ti≡C(t)Bu] (A; PNP(-)≡N[2-P(i)Pr2-4-甲基苯基]2(-)),在室温超过 24 小时,通过连续的 1,2-CH 键加成和 β-氢提取得到 [(PNP)Ti(η(2)-H2C=CH2)(CH2(t)Bu)] (1)。中间体 A 也可以将丙烷脱氢为丙烯,尽管不完全,以及线性和挥发性烷烃 C4-C6 可形成可分离的 α-烯烃配合物 [(PNP)Ti(η(2)-H2C=CHR)( CH2(t)Bu)](R = CH3 (2)、CH2CH3 (3)、(n)Pr (4) 和 (n)Bu (5))。配合物 1-5 可以由 [(PNP)Ti=CH(t)Bu(OTf)] 和相应的烷基化试剂 LiCH2CHR (R = H, CH3(unstable), CH2CH3, (n)Pr, and ( n) 不)。烯烃配合物 1 和 3-5 均已通过多种多核