The structure of the iso-propanol clathrate of 4-p-hydroxyphenyl 2,2,4-trimethylthiachroman, the direct thia-analogue of Dianin's compound, has been studied by single-crystal X-ray diffraction as a function of temperature from 371 K down to 90 K. The standard Dianin unit cell, observed at high temperature, undergoes two sequential commensurate thermal phase transformations which results at low temperature in a unit cell with 16 times the original volume and with Z′(host) = 16 and Z = 288, the space group R3 being retained. This ultimate unit cell with a quadrupled a-axis has a = 111.7910IJ5) Å and c = 10.8568(1) Å and the crystal packing now features not only the prototypal [OH] 6 hexamer host unit but also novel hydrogenbonded octameric host-guest units with respective symmetries C i and C 1. In addition it has been established that the corresponding achiral selena-Dianin's clathrate and the polar chiral quasiracemic isopropanol clathrate, space group R3, formed from R-Dianin's and S-thia-Dianin's components also exhibit novel related temperature-dependant behaviour.

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Hexakis‐brommethyl‐benzol (I) ergibt mit Benzylamin (II) das cyclische Triamin (III), das in das Tripyrrol (IV) umgewandelt wird.

Im Gegensatz zum Normethyl‐Analogen (II), das aus dem Enon (I) und‐Phenol zunächst im Gemisch mit Dianins Verbindung entsteht und Clathrate mit CCl4 bildet, deren Kristalle der Raumgruppe R5 angehören und 18‐Wirt‐ sowie 3‐Gastmoleküle pro Einheitszelle enthalten, verliert das Analoge (III), das aus Phenol und dem entsprechenden Dimethylchromen dargestellt wird, die Fähigkeit, Clathrate zu bilden.