Lithium (S)-1-[2‘-(Methoxymethyl)pyrrolidin-1‘-yl]-3,5-dimethylborata- benzene. An Enantiopure Lithium Salt Possessing a Novel Polymeric Structure1

doi:10.1021/OM010203B

Paper

Lithium (S)-1-[2‘-(Methoxymethyl)pyrrolidin-1‘-yl]-3,5-dimethylborata- benzene. An Enantiopure Lithium Salt Possessing a Novel Polymeric Structure1

Published Jun 7, 2001 · Xiaolai Zheng and, G. E. Herberich

Organometallics

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Abstract

Reaction of (S)-2-(methoxymethyl)pyrrolidine (SMPH) with the 1-chloro-3,5-dimethyldihydroborinines 3a,b in the presence of NEt3 afforded the SMP-substituted dihydroborinine isomers 4a−c (95% yield). Metalation of 4a−c with LiN(SiMe3)2 produced the salt lithium (S)-1-[2‘-(methoxymethyl)pyrrolidin-1‘-yl]-3,5-dimethylboratabenzene [Li(1)] (92%). Treatment of Li(1) with [(C5Me5)Fe(NCMe)3]PF6 gave the enantiopure ferrocene analogue (C5Me5)Fe(1) (98%). Crystallization of Li(1) from THP afforded colorless rods of [Li(1)(THP)0.5]∞ (≡2). In the crystal structure, 2 consists of infinite chains with alternating bis(boratabenzene)lithiate sandwich units and tetrahedral LiN2O2 centers. Whereas the B-exocyclic amino and the pendant ether functionalities from the SMP moieties act as donating coordination sites to the metal, the THP serves solely as a space-filling molecule.

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Lithium (S)-1-[2'-(methoxymethyl)pyrrolidin-1'-yl]-3,5-dimethylboratabenzene (Li(1)) is an enantiopure lithium salt with a novel polymeric structure, containing alternating bis(

PopulationOlder adults (50-71 years)

Sample size24

MethodsObservational

OutcomesBody Mass Index projections

ResultsSocial networks mitigate obesity in older groups.

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Paper

Lithium (S)-1-[2‘-(Methoxymethyl)pyrrolidin-1‘-yl]-3,5-dimethylborata- benzene. An Enantiopure Lithium Salt Possessing a Novel Polymeric Structure1

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References

Citations

Crystal structures of ordered and plastic-crystalline phases of iso-butyllithium by X-ray powder diffraction.

Iso-butyllithium has two stable, plastic-crystalline phases at ambient temperature, with an intermediate -phase in between.

Protonation of CpFe(η5-C6H7) as a convenient procedure for the preparation of the valuable synthon [CpFe(MeCN)3]+

Protonation of CpFe(5-C6H7) allows for the preparation of the valuable synthon [CpFe(MeCN)3]+ in a high yield, with the structure determined by X-ray diffraction analysis.

Flexibility of an Open Indenyl Ligand in Iron(II) Complexes

The open indenyl ligand in iron(II) complexes is flexible and susceptible to 5-3 interconversion, allowing for the preparation of complexes with diverse properties.

Boratatrozircenes: cycloheptatrienyl zirconium boratabenzene sandwich complexes – evaluation of potential η6–η5 hapticity interconversions

Boratatrozircenes show distorted 6-coordinated boratabenzene ligands with short Zr–B bonds, but no B–L bond formation was observed when using a large excess of a Lewis base.

2 Alkali and alkaline-earth metals

This year's highlights include the isolation of new compounds, a new form of BaCp2, and the first primary amide of a heavy alkaline earth metal.

1-Aminoboratabenzene Complexes of Scandium Group Metals (‡)

Lithium 1-aminoboratabenzenes can react with metal trihalides to produce complexes with close ring-ring rotational positions, offering potential applications in catalysis and photocatalysis.

Lithium (S)-1-[2‘-(Methoxymethyl)pyrrolidin-1‘-yl]-3,5-dimethylborata- benzene. An Enantiopure Lithium Salt Possessing a Novel Polymeric Structure1

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References

Citations

Crystal structures of ordered and plastic-crystalline phases of iso-butyllithium by X-ray powder diffraction.

Iso-butyllithium has two stable, plastic-crystalline phases at ambient temperature, with an intermediate -phase in between.

Protonation of Cp*Fe(η5-C6H7) as a convenient procedure for the preparation of the valuable synthon [Cp*Fe(MeCN)3]+

Protonation of Cp*Fe(5-C6H7) allows for the preparation of the valuable synthon [Cp*Fe(MeCN)3]+ in a high yield, with the structure determined by X-ray diffraction analysis.

Flexibility of an Open Indenyl Ligand in Iron(II) Complexes

The open indenyl ligand in iron(II) complexes is flexible and susceptible to 5-3 interconversion, allowing for the preparation of complexes with diverse properties.

Boratatrozircenes: cycloheptatrienyl zirconium boratabenzene sandwich complexes – evaluation of potential η6–η5 hapticity interconversions

Boratatrozircenes show distorted 6-coordinated boratabenzene ligands with short Zr–B bonds, but no B–L bond formation was observed when using a large excess of a Lewis base.

2 Alkali and alkaline-earth metals

This year's highlights include the isolation of new compounds, a new form of BaCp2, and the first primary amide of a heavy alkaline earth metal.

1-Aminoboratabenzene Complexes of Scandium Group Metals (‡)

Lithium 1-aminoboratabenzenes can react with metal trihalides to produce complexes with close ring-ring rotational positions, offering potential applications in catalysis and photocatalysis.

Protonation of CpFe(η5-C6H7) as a convenient procedure for the preparation of the valuable synthon [CpFe(MeCN)3]+

Protonation of CpFe(5-C6H7) allows for the preparation of the valuable synthon [CpFe(MeCN)3]+ in a high yield, with the structure determined by X-ray diffraction analysis.