Chromatographia

, Volume 64, Issue 11–12, pp 689–694 | Cite as

Separation of the Isomers of Oligomethylphenylcyclosiloxanes and Determination of their Structures by Capillary GC–MS

Original

Abstract

Cyclic (MePhSiO) n , formed by hydrolysis of MePhSiCl2, was analyzed by GC–MS on an HP-5 ms capillary column and separated into two different isomers of 2,4,6-trimethyl-2,4,6-triphenylcyclotrisiloxane (P3), four different isomers of 2,4,6,8-tetramethyl-2,4,6,8-tetraphenylcyclotetrasiloxane (P4), and four different isomers of 2,4,6,8,10-pentamethyl-2,4,6,8,10-pentaphenylcyclopentasiloxane (P5). Statistical distribution of the isomers was observed for every oligomethylphenylcyclosiloxane (P3, P4, and P5) with some steric effects of the phenyl group. Dissociation of the molecular ions was deduced from the mass spectra.

Keywords

Gas chromatography–mass spectrometry Statistical distribution cis and trans Isomers Oligomethylphenylcyclosiloxanes 

Notes

Acknowledgements

This work was supported in part by the Scientific Fund (No. 20051896) of the Education Department of Zhejiang Province, China.

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Copyright information

© Friedr. Vieweg & Sohn Verlag/GWV Fachverlage GmbH 2006

Authors and Affiliations

  1. 1.Key Laboratory of Organosilicon Chemistry and Material Technology, Ministry of Education Hangzhou Teachers College HangzhouPeople’s Republic of China

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