A New Motif in Halogen Bonding: Cooperative Intermolecular S−Br⋅⋅⋅O, O⋅⋅⋅F, and F⋅⋅⋅F Associations in the Crystal Packing of α,ω‐Di(sulfonyl bromide) Perfluoroalkanes
作者:Max Wacha、David L. Helm、Megan M. Smart、Colin D. McMillen、Leah B. Casabianca、Rakesh Sachdeva、Catherine R. Urick、London P. Wilson、Joseph S. Thrasher
DOI:10.1002/asia.202300012
日期:2023.3.14
At 2.911(4) Å, the S−Br⋅⋅⋅Ohalogen bonds in BrSO2(CF2)4SO2Br are 0.316 Å shorter than the corresponding S−Cl⋅⋅⋅O interactions in ClSO2(CF2)4SO2Cl, while these distances are much more comparable in BrSO2(CF2)6SO2Br, BrSO2(CF2)8SO2Br, and ClSO2(CF2)6SO2Cl. The current results are clearly indicative of stronger halogenbonding to the larger, heavier halogen bromine.
在 2.911(4) Å 处,BrSO 2 (CF 2 ) 4 SO 2 Br中的 S−Br⋅⋅⋅O 卤素键比 ClSO 2 (CF 2 )中相应的 S−Cl⋅⋅⋅O 相互作用短 0.316 Å 4 SO 2 Cl,而这些距离在 BrSO 2 (CF 2 ) 6 SO 2 Br、BrSO 2 (CF 2 ) 8 SO 2 Br 和 ClSO 2 (CF 2 ) 6 SO 2中更具有可比性Cl。目前的结果清楚地表明与更大、更重的卤素溴形成更强的卤素键合。
Reaction of perfluoroalkanesulfinates with allyl and propargyl halides. A convenient synthesis of 3-(perfluoroalkyl)prop-1-enes and 3-(perfluoroalkyl)allenes
作者:Changming Hu、Fengling Qing、Weiyuan Huang
DOI:10.1021/jo00008a041
日期:1991.4
The reaction of perfluoroalkanesulfinates, R(f)CF2SO2Na, with allyl and propargyl halides, in the presence of (NH4)2S2O8, gave 3-(perfluoroalkyl)prop-1-enes (R(f)CH2CH = CH2) and 3-(perfluoroalkyl)allenes (R(f)CH = C = CH2), respectively, in good yield. Evidence is presented for a radical addition-elimination mechanism for the reaction. The reaction represents a synthetically viable and convenient route to such compounds.