All articles of this category A triply bridged triphenylmethyl dication {6,13,23,30,39,46-hexaoxaoctacyclo[16.16. 16.2 2,5 .2 14,17 .2 19,22 .2 31,34 . 2 35,38 .2 47,50 ]dohexaconta-2,4,14,16,19,21,31,33,35,37,47, 49,51,53,55,57,59,61-octadecaene-8,10,25,27,41,43-hexayne-1,18-diyliumbis (tetrafluoroborate) 4 } and its open-chained analogue 1,6-bis{4-[bis-(4-methoxyphenyl) methyl]phenoxy}hexa-2,4-diynediylium bis(tetrafluoroborate) (9) are synthesized by using a new variant of the Eglinton reaction. Compound 4 constitutes the first example of concave dyestuffs bearing a large rigid cavity.
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Berscheid et al. (1992) studied this question.
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