Use a bigger crown ether, one with two independent oligo ether loops, stick two secondary ammonium ions through it and then join the ends of those threads together in the right way and you’ve got some Borromean rings…
That's no problem. I think we've gotten up to a monophenyl 60-C-20 equivalent, and that's just because we got bored, and had proved enough of a point--this remains unpublished from our group, but basically, yields are good, and it isn't fancy.
Sorry. Remembered who I am talking to. It is incredibly fancy Stu, really fancy. Like would TOTALLY be appropriate for some one-named journals that publish really fancy things. Paradigm shifting even. Important, impactful, and likely to get cited a lot.
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(but we just thought we were being clever)