Three pillar[n]arenes (n = 8–10) were synthesized. X-ray analysis demonstrated that, different from early reported small pillar[n]arenes (n = 5, 6), these larger macrocycles gave rise to two cavities. 1H NMR and MS experiments revealed that pillararene complexed one n-octyltrimethyl ammonium in chloroform, while pillararene could complex two.
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