31179-52-9Relevant academic research and scientific papers
Fluoro-ene reaction versus [2+2] cycloaddition in the thermal C 2-C6 cyclization of enyne-allenes: An experimental and theoretical investigation
Cinar, M. Emin,Vavilala, Chandrasekhar,Jaquet, Ralph,Bats, Jan W.,Schmittel, Michael
, p. 5166 - 5177 (2014)
A series of fluoroalkyl-substituted enyne-allenes have been synthesized by a new route with the aim of elucidating the possibility of a fluoro-ene reaction via an intermediate fulvenyl diradical generated in the thermal C 2-C6 (Schmittel) cyclization reaction. As a result of the strong C-F bond, fluorine atom transfer was not observed. Instead, 1H-cyclobuta[a]indenes were formed in good yields despite the high strain energy. DFT calculations at the B3LYP level of theory indicated that although the fluoro-ene reaction is the most exothermic reaction available, cyclobutene formation is kinetically favored over the [1,5]-fluorine shift by 5-15 kcal mol-1 in various model compounds. Copyright
