Paracyclophane space group

The molecular structure of 1,2,9,10-tetragerma[2.2]paracyclophane 17 was determined by the X-ray diffraction study. The single crystals of 17 for X-ray crystallography were obtained from a toluene solution. Similar to 12, the crystal belongs to the space group P2Jn, and the data collection was carried out at 13°C. The ORTEP drawing of 17 is shown in Fig. 7. 

Single-crystal X-ray analysis revealed that the purple phase [(Cp Ru)2(paracyclophane)] (TCNQ)2 crystallized in the P space group and contained one-dimensional mixed stacks of [(Cp Ru)2(paracyclophane)] and... 

E. Through-Space and Through-Bond interactions in [2.2]paracyclophanes Bridged by Group 14 Elements... 

Anions derived from cyclophane represent a new class of carbanions in which new modes of electron delocalization were encountered. Two main groups of cyclophane anions were studied. In the [2J (n = 2) paracyclophane 190,191 several modes of electron delocalization may occur as they have an inner and outer periphery. Another group of interesting cyclophanes is the [2.2]paracyclphanes in which through space interactions may prevail. 

Through-space pinacol rearrangements have also been observed. When paracyclophane 18, a diol with hydroxyl groups in pseudo-vicinal proximity, was exposed to acid, a surprising transannular pinacol-like hydride migration occurred to yield ketone 19. ... 

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