A Synthetic and NMR Conformational Study of Spiro Cyclic Quaternary Ammonium Salts,

Robert Alan Aitken; EF Philp; Frank Gordon Riddell; MH Smith

A Synthetic and NMR Conformational Study of Spiro Cyclic Quaternary Ammonium Salts,

Robert Alan Aitken, EF Philp, Frank Gordon Riddell, MH Smith

Research output: Contribution to journal › Article › peer-review

Abstract

The preparationand NMR spectra for a range of spirocyclic mono-, bis- and tris- quaternaryammonium salts are reported. In the case of the tricyclic bis(ammonium) salt 7 a dynamic process is observed in the C-13 NMR spectrum and by means of a variable temperature study and MAS solid state NMR this is attributed to ring-inversion of central ring with the axial and equatorial C-N+ carbons of the outer two rings being nonequivalent. The energy barrier for this inversion is determined to be 53.4 +/- 0.2 kJ mol(-1).

Original language	English
Pages (from-to)	63-70
Number of pages	8
Journal	ARKIVOC
Volume	3
Issue number	part iii
Publication status	Published - 2002

Cite this

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title = "A Synthetic and NMR Conformational Study of Spiro Cyclic Quaternary Ammonium Salts,",

abstract = "The preparationand NMR spectra for a range of spirocyclic mono-, bis- and tris- quaternaryammonium salts are reported. In the case of the tricyclic bis(ammonium) salt 7 a dynamic process is observed in the C-13 NMR spectrum and by means of a variable temperature study and MAS solid state NMR this is attributed to ring-inversion of central ring with the axial and equatorial C-N+ carbons of the outer two rings being nonequivalent. The energy barrier for this inversion is determined to be 53.4 +/- 0.2 kJ mol(-1).",

author = "Aitken, {Robert Alan} and EF Philp and Riddell, {Frank Gordon} and MH Smith",

note = "Issue in Honor of Dr Douglas Lloyd",

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journal = "ARKIVOC",

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AU - Riddell, Frank Gordon

AU - Smith, MH

N1 - Issue in Honor of Dr Douglas Lloyd

PY - 2002

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N2 - The preparationand NMR spectra for a range of spirocyclic mono-, bis- and tris- quaternaryammonium salts are reported. In the case of the tricyclic bis(ammonium) salt 7 a dynamic process is observed in the C-13 NMR spectrum and by means of a variable temperature study and MAS solid state NMR this is attributed to ring-inversion of central ring with the axial and equatorial C-N+ carbons of the outer two rings being nonequivalent. The energy barrier for this inversion is determined to be 53.4 +/- 0.2 kJ mol(-1).

AB - The preparationand NMR spectra for a range of spirocyclic mono-, bis- and tris- quaternaryammonium salts are reported. In the case of the tricyclic bis(ammonium) salt 7 a dynamic process is observed in the C-13 NMR spectrum and by means of a variable temperature study and MAS solid state NMR this is attributed to ring-inversion of central ring with the axial and equatorial C-N+ carbons of the outer two rings being nonequivalent. The energy barrier for this inversion is determined to be 53.4 +/- 0.2 kJ mol(-1).

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M3 - Article

SN - 1551-7004

VL - 3

SP - 63

EP - 70

JO - ARKIVOC

JF - ARKIVOC

IS - part iii

ER -

A Synthetic and NMR Conformational Study of Spiro Cyclic Quaternary Ammonium Salts,

Abstract

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