The synthesis and facile thermal electrocyclization of 3-vinyl-1,3,5-hexatriene
作者:Charles W. Spangler
DOI:10.1016/0040-4020(76)80105-6
日期:1976.1
3-Vinyl-1,3,5-hexatriene undergoes an extremely facilethermalelectrocyclization to yield 2-vinyl-1,3-cyclohexadiene. Cyclization is at least thirty times faster than 3-ethyl-1,3,5-hexatriene, the saturated analog. Activation parameters indicate that this electrocyclization is one of the most facile yet observed for an acyclic 6π-electron system.
Evidence for a novel carbene-carbene rearrangement of a new foiled methylene
作者:Udo H. Brinker、Lothar Koenig
DOI:10.1021/ja00391a050
日期:1981.1
.alpha.-Haloalkanesulfonyl bromides in organic synthesis. 5. Versatile reagents for the synthesis of conjugated polyenes, enones, and 1,3-oxathiole 1,1-dioxides