The crystal structure of tetrakis(4-ethynylphenyl)methane 1 shows interwoven diamondoid lattices formed by weak hydrogen bonds between the acetylenic groups, while 1,3,5,7-tetrakis(4-ethynylphenyl)adamantane 2 crystallizes in a non-symmetrical network.
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Galoppini et al. (1999) studied this question.
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