- Vibrational spectra and assignment for trans-3,4-dichlorocyclobutene. Revised assignment for the cis isomer
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A complete assignment of the vibrational fundamentals of trans-3,4-dichlorocyclobutene has been derived from infrared and Raman spectra.These frequencies are: (a) 3107, 2985, 1555, 1283, 1248, 1163, 1126, 1010, 920, 821, 452, 228 and 134 cm-1; (b) 3087, 2998, 1291, 1220, 1171, 956, 889, 782, 606, 327 and 246 cm-1.A long-path, gas-phase infrared spectrum is reported for the cis isomer.After some revisions in the previous assignment of the fundamentals of the cis isomer, notably lowering the ring puckering frequency from 381 to 145 cm-1, good correlations exist between the frequencies for the two isomers and with pertinent modes in cyclobutene itself.
- Craig, Norman C.,Hawley, Susan E.,Perry, Catherine L.
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p. 881 - 891
(2007/10/02)
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- Stereochemistry of Dehydrogenation of 1,4-cyclohexadiene with 2,3-dichloro-5,6-dicyano-p-benzoquinone
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cis- and trans-(3,6-D2)-1,4-cyclohexadienes 1a and 1b have been synthesized from cis-3,4-dichlorocyclobutene (5).Aromatization to benzene with DDQ is cis-stereospecific with an uncertainty of 5percent.This results is discussed in relation to concerted or stepwise mechanisms for aromatization of 1,4-dihydroaromatics with 2,3-dichloro-5,6-dicyano-p-benzoquinone (DDQ).
- Mueller, Paul,Joly, Daniel,Mermoud, Francois
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p. 105 - 112
(2007/10/02)
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