Artículos de revistas
INFLUENCE OF THE STERIC HINDRANCE OF ANCILLARY LIGANDS IN Ru-BASED COMPLEXES APPLIED IN METATHESIS OF CINNAMYL ALCOHOL AND CINNAMYL ACETATE
Fecha
2020-01-01Registro en:
Quimica Nova. Sao Paulo: Soc Brasileira Quimica, v. 43, n. 1, p. 24-31, 2020.
0100-4042
10.21577/0100-4042.20170462
S0100-40422020000100024
WOS:000520600700004
S0100-40422020000100024.pdf
Autor
Univ Estadual Piaui
Universidade de São Paulo (USP)
Universidade Estadual Paulista (Unesp)
Institución
Resumen
Cinnamyl alcohol (AC) and cinnamyl acetate (ACM) were used as substrates in olefin metathesis reactions catalyzed by RuCl2(PCy3)(2)(=CHPh), first-generation Grubbs catalyst-G1, and RuCl2(PCy3)(H(2)Mes)(= CHPh), second-generation Grubbs catalyst-G2. The reactions occurred in the same reaction conditions for both substrates, 50 degrees C, for 24 h, in the proportions Ru:substrate of 1:1 and 1:10 mol. At the end of each experiment, the reaction mixture was evaluated by GC-MS and NMR of C-13[H-1]. The results revealed different products when G1 and G2 are applied in the metathesis of AC, 1,5-diphenyl-2-pentene and stilbene, respectively. When ACM is the substrate, no product is noted with G1 and stilbene was the compound obtained with G2 as catalyst. In this study, we have presented a discussion about the electronic and steric influence of the ancillary ligands in the yield and type of product formed in the catalytic process.