Crystal Structure Analysis of 1,1,4,4-Tetrafluorobutadiene and Experimental Determination of the Charge Density of 1,1,4,4-Tetrafluorobutatriene This work was supported by the Deutsche Forschungsgemeinschaft and the Fonds der Chemischen Industrie.

Structures and Properties of trans‐1,3,3,3‐Tetrafluoro‐ propene (HFO‐1234ze) and 2,3,3,3‐Tetrafluoropropene (HFO‐1234yf) Refrigerants

“…The extended solid‐state structure shows a herringbone like arrangement of the molecules along the c ‐axis (Supporting Information, Figure S12). A similar pattern was also observed for 1,1,4,4‐tetrafluorobutadiene …”

Fluorinated butatrienes

“…Lentz et al reported a yellow oil. 73 The reported color was most likely caused by remaining bromine. In addition the yield increases dramatically from 52% to 82%, Compound 12 is air and room temperature stable but within several weeks the color changes to slightly pink.…”

“…Later, Raman-and PE-spectroscopic data were added 71,72 and its structure and experimental charge density was elucidated by high-resolution X-ray diffraction. 73 Compound 5 decomposes even in anhydrous solvents under vacuum or inert atmosphere within a few hours. Nevertheless it was possible to synthesize two of its transition metal complexes directly from the triene, [M(η 2 -C 4 F 4 )(CO)(PPh 3 ) 2 Cl] (M = Ir, Rh).…”

Reactions of Fluoroalkenes with an Aluminium(I) Complex

“…At 353 K, 4 a has a half‐life of approximately 6 days. For comparison, the first C−F bond cleavage is fast and 4 a forms from 1 and hexafluoropropene within minutes at 298 K. A further reaction between 1 and 1,1,1,4,4,4‐hexafluoro‐2‐butene (10 equiv; HFO‐1336‐mzz) did not allow the isolation of a new organoaluminium compound but instead led to the formation of an s‐ trans isomer of 1,1,4,4‐tetrafluorobutadiene and 1‐F 2 . While the unambiguous assignment of this pathway will have to await a full mechanistic study, it appears that, in this case, the rate of the second C−F bond cleavage step is either similar to or faster than the first, possibly due to the ease of 1,3‐diene formation over allene formation, leading directly to the organic product.…”