... substituents of the benzhydrylium ions affected ΔH ⧧ whereas ΔS ⧧ remained almost constant (−117 ± 7 J mol -1 K ... A plot of log k 20 ° C vs the electrophilicity parameters E of the benzhydrylium ions ... Addition of >3 equiv of 2-chloropropene to solutions of 6−GaCl 4 or 7−GaCl 4 ...