Stable Carbonium Ions. XXII.^1a Phenylethyl Cations²

Stable carbocations. 204. Rearrangement and equilibria of ions formed from side-chain substituted .beta.-phenylethyl chlorides under stable ion conditions

“…At -105 °C, these rapid hydride shifts are frozen out, suggesting an energy barrier of 8-10 kcal/mol for the process. The concentration of 10 at equilibrium must, however, be exceedingly low, since quenching with methanol at -78 °C gave an almost quantitative yield of 1 -methoxy-\-(pmethoxyphenyl)propane (11).…”

Conversion of Coal to Gasoline

“…The metal on molecular sieve catalysts can permit selective hydrogenation of molecules-those, and only those, which can enter the pores of the sieve (59). The superacid catalyst can add a proton even to methane (40). Some substances can have catalytic hydrogenation ability enhanced by strain sites generated by dehydration at high temperature or by exposure to x-rays (37).…”

Carbocations in Superacid Systems

“…353 If, however, the tertiary carbocation is not benzylic, rearrangement to a 353 If, however, the tertiary carbocation is not benzylic, rearrangement to a…”

“…secondary benzylic ion can be observed 350,353 (Scheme 3.5). With suitable substituent groups (which also prevent transalkylations), secondary styryl cations (140)(141)(142) were found as stable, long-lived ions.…”