199008-02-1Relevant articles and documents
Alkylidene-2H-pyrans by thermal electrocyclic ring closure of (2Z)-divinylallenals
De Lera, Angel R.,Torrado, Alicia,Rey, Jose Garcia,Lopez, Susana
, p. 7421 - 7424 (2007/10/03)
Electrocyclic ring closure of (2Z)-divinylallenals 8 (including the retroretinal derivative 8a), afforded the corresponding alkylidene-2H-pyrans, under very mild conditions (25°C, 48 h). Initially, an equilibrium between 8a and the kinetic product E-9a wa