Pulse Radiolysis of Tetraphenylcyclobutane in Hexamethylphosphoric Triamide Solution

Abstract

r-1, c-2, t-3, t-4-tetraphenvlcyclobutane (TPCB) was irradiated in dilute solutions of hexamethylphosphoric triamide (HMPT) with 20 ns pulses of 16 MeV electrons. Solvated electrons (e-solv) produced during the radiolysis of HMPT react with TPCB with k = (6 ± 1) · 109 l/mol s. Simultaneously with the decay of the optical absorption of the solvated electrons, the formation of the absorption of t-stilbene (at 300 nm) and that of stilbene radical anions (at 500 nm) was observed. Thus, it is concluded th at TPCB is undergoing a dissociative electron attachment process e-solv + TPCB→t-St + t-St·̄̅. The lifetime of a possible intermediate (TPCB·̄̅) was estimated as being smaller than 10-9 s. The 100 eV yield of t-stilbene was determined as G(t-St) = 3.4.

Triplet Benzene-Sensitized Cycloreversion of Arylcyclobutane

“…of triphenylcyanocyclobutane (1) in benzene forms A simple kinetic treatment gives Eq. (1) and (2): Figure 4.…”