Preparation of a donor-acceptor Stenhouse Adduct (DASA): 5-((2Z,4E)-5-(diethylamino)-2-hydroxypenta-2,4-dien-1-ylidene)-2,2-dimethyl-1,3-dioxane-4,6-dione
F.J. Stricker, P. Julie, R. de A. Javier, Organic Syntheses 99 (2022) 79–91.