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New Chiral Amide Ligands Derived from (±)-trans-1,2-Diaminocyclohexane. Applications in Titanium(IV) Chemistry

Authors: Barbara Tsuie; Richard F. Jordan; Jeffrey L. Petersen; and Dale C. Swenson;

New Chiral Amide Ligands Derived from (±)-trans-1,2-Diaminocyclohexane. Applications in Titanium(IV) Chemistry

Abstract

Titanium(IV) hydrocarbyl compounds containing chiral bis(amide) ligands derived from (±)-trans-1,2-(NHSiR3)2-cyclohexanes (6a−c: SiR3 = SiMe3 (a), SiMe2Ph (b), SiMePh2 (c) are described. The reaction of (±)-trans-1,2-diaminocyclohexane with SiR3Cl and NEt3 affords diamines 6a−c in 60−80% yield. Double deprotonation of 6a−c with 2 equiv of n-BuLi yields the dilithio salts Li2[(±)-trans-1,2-(NSiR3)2-cyclohexane] (7a−c) in 70−97% yield. The reaction of 7a,b with TiCl4(THF)2 in toluene yields mixtures of {(±)-trans-1,2-(NSiR3)2-cyclohexane}TiCl2 (8a,b) and bis(ligand) complexes {trans-1,2-(NSiR3)2-cyclohexane}2Ti (9a,b; mixture of diastereomers). The reaction of 7c with TiCl4 yields {(±)-trans-1,2-(NSiMePh2)2-cyclohexane}TiCl2 (8c; 15% isolated yield). The reaction of 6a,b and Ti(CH2Ph)4 yields {(±)-trans-1,2-(NSiR3)2-cyclohexane}Ti(CH2Ph)2 (10a,b) cleanly, but these species are difficult to isolate due to their high solubility. Iodinolysis of 10a,b with I2 yields {(±)-trans-1,2-(NSiR3)2-cyclohexane}TiI2 (11a...

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citations
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
80
Average
Top 10%
Top 10%
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