Elect rooxidation of the Tetraphenylborate Ion in Aqueous Solution at the Platinum Disk Electrode

Abstract

DiscussionThe data of Table I clearly show that the average absorption int,ensity differences between the cyclot risiloxanes, cyclotetrasiloxanes, and higher cyclics are much larger than the standard deviations for each group of cyclics. The differences between the cyclopentasiloxanes and the cyclohexasiloxanes do not appear to be significant.If we consider the geometric configurations of these c.yclics in order of increasing ring size, we find that the average angle between the substituents on successive silicon atonis and conseqiiently the average distance between these substituents will decrease as the ring size increases. These changes in intergroup distance as the ring size changes from cyclotetrasiloxane to cyclopentasiloxane to cyclohexasiloxane could be less important as opportunity for ring puckering increases in the larger rings. Cases of rigidly enforced proximity and orientation of phenylene groups are found in the paracyclophanes a,nd lJ4-polymethylenebenzene cyclics studied by Cram3 and in the siloxane analog of the paracyclophanes studied by M a~K a y .~ MacKay's compound is 13, No. 6, 181 (1958). (3) M. A. Greenbaum, J. N. Foster, M . L. Arin, and M. Farher, J.

Organic Polarography

“…The oxidation of tetraphenylborate was carried out at rotating Pt (840,844) and pyrolytic graphite (842). The utility of the carbon paste electrode was demonstrated by applying it to ferrocene analysis (450).…”