Polycyclic ferrocenyl-4,5-dihydropyrazoles in nucleophilic reactions with ?-dicarbonyl compounds
Alvarado Rodríguez, José Guadalupe
2003
Polycyclic ferrocenyl-4,5-dihydropyrazoles in nucleophilic reactions with beta-dicarbonyl compounds Elena I. Klimova, Tatiana Klimova, Marcos Martínez García, Eduardo A. Vázquez López, Rafael Moreno Esparza, José G. Alvarado Rodríguez, Teresa Ramírez Apan Journal of Organometallic Chemistry (2003), 665, 69-75. http://dx.doi.org/10.1016/S0022-328X(02)02064-8
Abstract
Polycyclic ferrocenyldihydropyrazoles with a free ?NH group react with ethyl acetoacetate and acetylacetone to give the corresponding enamino carbonyl compounds isolated as E-isomers. The spatial structure of (E)-4-[1-(ethoxycarbonyl)prop-2-en-2-yl]-3-ferrocenyl-1,4,5-triazatricyclo[5.2.2.02,6]undec-5-ene was determined using X-ray diffraction analysis. Spontaneous isomerization of (E)-(4-oxopent-2-en-2-yl)(ferrocenyl)dihydropyrazoles into the respective Z-isomers was observed.