174833-99-9Relevant articles and documents
Structural effects affecting the thermal electrocyclic ring closure of vinylallenes to alkylidenecyclobutenes
López, Susana,Rodríguez, Jesús,Rey, José García,De Lera, Angel R.
, p. 1881 - 1891 (2007/10/03)
The thermal electrocyclic ring closure of (2E,7E)-3,4,7-trialkylnona-2,4,5,7-tetraenes (divinyl-4,5-allenes) is regioselective, occurring at the most sterically congested vinylallene subunit to afford the trisubstituted alkylidenecyclobutene. Ring closure