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Rotational Spectra, Structure, and Electric Dipole Moments of Methyl and Ethyltert-Butyl Ether (MTBE and ETBE)

✍ Scribed by R.D. Suenram; F.J. Lovas; W. Pereyra; G.T. Fraser; A.R.Hight Walker

Publisher: Elsevier Science
Year: 1997
Tongue: English
Weight: 335 KB
Volume: 181
Category: Article
ISSN: 0022-2852
DOI: 10.1006/jmsp.1996.7155

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✦ Synopsis

The rotational spectra of methyl and ethyl tertiary butyl ether (MTBE and ETBE) have been observed and analyzed using a pulsed-molecular-beam Fabry-Perot cavity microwave spectrometer. Both a-and b-type transitions are observed for each compound. Small CH 3 internal rotation splittings from the OCH 3 group of Ç1 MHz are observed for MTBE. The high sensitivity of the Fourier transform microwave (FTMW) technique allows observation and analysis of the rotational spectra of all 13 C isotopes and the 18 O isotopic species in natural abundance. For ETBE, the structural analysis indicates that the lowest energy form of the molecule is the completely extended conformer with C s symmetry. For both compounds, the bulkiness of the t-butyl group causes the COC angle to be 6Њ to 7Њ larger than that found in most other ethers.

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