The First Structure of a Vicinal (E)-Fluoroselenoolefin: (E)-(5-Fluoro-4-octen-4-yl)dimethylselenonium Picrate
作者:H. Poleschner、U. Schilde
DOI:10.1107/s0108270195014260
日期:1996.3.15
The structure of the title compound, C10H20FSe+.C6H2-N3O7-, synthesized from (E)-4-methylseleno-5-fluoro-4-octene with trimethyloxonium tetrafluoroborate, followed by anion exchange with sodium picrate, proves the trans addition of RSeF equivalents in the fluoroselenenylation of acetylenes with XeF2-R(2)Se(2) and XeF2-PhSeSiR(3) reagents [dihedral angle Se-C4-C5-F-178.7 (1)degrees].
Poleschner, Helmut; Heydenreich, Matthias; Radeglia, Reiner, Magnetic Resonance in Chemistry, 1999, vol. 37, # 5, p. 333 - 345
A new, efficient method of fluoroselenenylation of terminal, and open-chain symmetric and unsymmetric disubstituted acetylenes and cycloalkynes, gives vicinal (E)-fluoroalkenyl selenides in moderate to high yields by addition of selenenyl fluoride equivalents. These are formed in situ from xenon difluoride and diaryl, dibenzyl or primary and secondary dialkyl diselenides. Alternatively, the benzeneselenenyl fluoride equivalent is formed by treatment of more reactive phenylselenotrialkylsilanes with xenon difluoride. The regiochemistry of the addition is strongly dependent on the steric effects of substituents bonded to the acetylene.