A statistical comparison of two determinations of the crystal structure of 2,3,4,5,6-pentafluorobiphenyl, a molecule forming mixed stacks in the solid state

Supramolecular synthons in crystals of partially fluorinated fused aromatics: 1,2,3,4-Tetrafluoronaphthalene and its aza-analogue 1,3,4-trifluoroisoquinoline

“…The F Á Á Á p (Ar H ) interaction observed in 2 resembles that in 2,3,4,5,6-pentafluorobiphenyl [27,28] where C-F bond of one molecule is oriented parallel to a hydrocarbon ring of another with atom-to-plane and atom-to-centroid distances of 3.34 and 3.47 Å , respectively.…”

Structures of polyfluoroaromatic compounds. IV. Crystal structure of 2-nitrononafluorobiphenyl

“…3176 reflexions were scanned within the range 0.1 < sin 0/2 < 0.65 A -1 of which 1407 having I > 2.5a(I) were considered to be observed. Three zero-layer reflexions were remeasured * Part III: Brock, Naae, Goodhand & Hamor (1978).…”

Regiospecific nucleophilic substitution in 2,3,4,5,6-pentafluorobiphenyl as model compound for supramolecular systems. Theoretical study of transition states and energy profiles, evidence for tetrahedral SN2 mechanism

“…amino derivative of PFBi (15) was further modified at the terminal amino group by acylation or fluoroalkylation. The reaction of 8 was applied to meso -5,10,15,20-tetrakis-(pentafluorophenyl)porphyrin (20) to afford tris- (21) and tetrakis-substituted (22) products with complete para-regioselectivity. Theoretical studies of the reaction pathways of PFBi with ammonia, microsolvated lithium fluoride or lithium hydroxide revealed that no Meisenheimer-type intermediates are formed in the course of the simulated reactions: instead, tetrahedral S N 2 mechanism was found.…”

“…Our experience in the chemistry denoted in Table 1 has been applied to meso-5,10,15,20-tetrakis(pentafluorophenyl)porphyrin (20) as reported in our recent papers [8]. In this paper, the reaction of 20 with Boc-semiprotected propane-1, Scheme 2) in dioxane at 100 8C was studied: it proceeded slowly and even after three weeks the monosubstitution of fluorine atoms in pentafluorophenyls was not complete to afford a mixture of tris- (21) and tetrakis-substituted (22) products in 31% and 30% respective yields.…”