Journal of Organic Chemistry p. 1231 - 1236 (1987)
Update date:2022-08-04
Topics:
Chen, Tsu-yu Raymond
Anderson, Mark R.
Grossman, Steven
Peters, Dennis G.
Polarograms and cyclic voltammograms exhibit two waves for reduction of phenylpropadiene at a mercury electrode in dimethylformamide containing tetra-n-butylammonium perchlorate; the first wave signals reduction of phenylpropadiene to 1-phenyl-1-propene and the second wave is attributable to reduction of 1-phenyl-1-propene to 1-phenylpropane.However, the first wave is abnormally small because phenylpropadiene undergoes substantial rearrangement to 1-phenyl-1-propyne, which is reducible to 1-phenylpropane at nearly the same potential as 1-phenyl-1-propene.Controlled-pot ential electrolyses of phenylpropadiene, 1-phenyl-1-propene, and 1-phenyl-1-propyne at mercury pool cathodes have verified the processes elucidated by means of polarography and cyclic voltammetry.In the presence of diethyl malonate (a proton donor), base-catalyzed isomerization of phenylpropadiene to 1-phenyl-1-propyne is blocked totally; at a potential corresponding to the first wave for reduction of phenylpropadiene, electrolysis products are trans-1-phenyl-1-propene, cis-1-phenyl-1-propene, and 1-phenyl-2-propene, whereas 1-phenylpropane and 1-phenyl-2-propene are obtained at a potential on the second reduction wave for phenylpropadiene.
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