Flash vacuum thermolysis of 1,8-(2a), 1,6-(2b) and 1,3-bis(l-chloroethenyl)pyrene (2c) gives the novel C20H10 cyclopenta-fused Polycyclic Aromatic Hydrocarbons (CP-PAHs) cyclopent[fg]-( l a ) , cyclopent[jk]-(1 b) and cyclopent[ mnlacepyrylene (Ic), respectively; bis(cyc1openta-fusion) topology has a profound influence on their properties.
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From a saturated C 6 H 6 solution of racemic 4-(tetrahydro-4H-thiopyran-1-oxide-4-ylidene)-cyclohexanone oxime [1 (1-R/1-S)] the co-crystal (1) 4 ·C 6 H 6 is crystallized. Single crystal X-ray analysis showed that (1) 4 ·C 6 H 6 (P1 space group) in the solid-state consists of enantiomorphous, non-covalent polymer-like chains that contain, in an alternating fashion, the crystallographically independent enantiomers 1-R and 1-R or 1-S and 1-S , respectively. Within each chain the enantiomers are linked by 'head-to-tail' intermolecular oxime-sulfoxide hydrogen bonding [D (2)
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