Synthesis and Characterization of the New Alkyl Borates [RB(C<sub>6</sub>F<sub>5</sub>)<sub>3</sub>]<sup>-</sup> (R = CH<sub>2</sub>Me, CHMe<sub>2</sub>, CH<sub>2</sub>CMe<sub>3</sub>): Utilization of [Me<sub>3</sub>CCH<sub>2</sub>B(C<sub>6</sub>F<sub>5</sub>)<sub>3</sub>]<sup>-</sup> as a Weakly Coordinating Counteranion during Zirconocene-Induced Catalysis of Propylene Polymerization
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https://figshare.com/articles/dataset/Synthesis_and_Characterization_of_the_New_Alkyl_Borates_RB_C_sub_6_sub_F_sub_5_sub_sub_3_sub_sup_sup_R_CH_sub_2_sub_Me_CHMe_sub_2_sub_CH_sub_2_sub_CMe_sub_3_sub_Utilization_of_Me_sub_3_sub_CCH_sub_2_sub_B_C_sub_6_sub_F_sub_5_sub_sub_3_sub_sup_sup_as_a_Wea/3283438
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资源简介：
Reactions of alkyllithium compounds RLi (R = Me, Et, i-Pr, Np) with B(C6F5)3 result in
the formation of the alkylborate salts Li[RB(C6F5)3]. Metathesis reactions of these with Ph3CCl and chloride salts of (Ph3P)2N+, PMePh3+, and HNMe2Ph+ proceed with varying degrees
of success, as shown by NMR spectroscopy and electrospray mass spectrometry, and the
compounds [PPN][EtB(C6F5)3], [PMePh3][NpB(C6F5)3], and [HNMe2Ph][NpB(C6F5)3] have
been characterized crystallographically. All three anions assume the expected pseudotetrahedral structures with normal B−aryl bond lengths and R−B−aryl and aryl−B−aryl bond
angles. The compound [HNMe2Ph][NpB(C6F5)3] reacts with Cp2ZrMe2, (Indenyl)2ZrMe2, and
SBIZrMe2 to give propylene polymerization catalysts that are significantly more active and
give higher molecular weight polypropylene than do the catalysts obtained using B(C6F5)3.
Thus the [NpB(C6F5)3]- anion is for steric reasons more weakly coordinating than is
[MeB(C6F5)3]-.
创建时间：
2016-05-06
