Ethenolysis of esters of vegetable oils: Effect of B₂O₃ addition to Re₂O₇/SiO₂.Al₂O₃‐SnBu₄ and CH₃ReO₃/SiO₂.Al₂O₃ metathesis catalysts

Abstract

Impregnation of SiO2.AI203 (24.3% AI203) with 6% B203 increases the activity of supported Re207 in the ethenolysis of methyl oleate, but reduces the activity of CH3ReO 3 on the same support. Re2OT/SiO2.AI203/B203-SnBu 4 is shown to be an effective catalyst for the ethenolysis of methyl linoleate and of the methyl esters of olive oil, and can be recycled after calcination at least five times without loss of activity. JAOCS 73, 229-232 (1996).

Valorisation of vegetable oils via metathesis reactions on solid catalysts: Cross-metathesis of methyl oleate with 1-hexene

“…In particular, the metathesis of methyl oleate (MO) with ethylene (ethenolysis) and with 2-butene were investigated on Ru complexes [10,11,12]while the cross-metathesis of MO with 1-hexene was studied on homogeneousWCl 6 /(CH 3 ) 4 Sn catalysts [13]. [14,15],but there are no reportson the use of immobilized Ru complexes for promoting the cross-metathesis of MO with olefins. Precisely, in this work we study the cross-metathesis of MO with 1-hexene (C6) on second generation RuHoveyda-Grubbs complexes supported onsilica.…”

Ethenolysis: A Green Catalytic Tool to Cleave Carbon–Carbon Double Bonds

“…Early works in this field started with the utilization of tungsten and rhenium metathesis catalysts operating under high hydrogen pressure (30 atm), in order to minimize self‐metathesis reactions . With the discovery of efficient ruthenium and molybdenum catalysts, this ethenolysis reaction was extensively studied and significant improvements were achieved in terms of catalytic efficiency and productivity.…”

Metátese de olefinas no Brasil: "Brazil is romping it!"

“…R. Buffon (IQ/Unicamp) surge na literatura como uma das primeiras pesquisadoras brasileiras a publicar trabalhos sobre este tipo de reação [27][28][29][30][31][32][33][34][35][36][37][38][39][40] . Em suas publicações, observam-se estudos com catalisadores de rênio e tungstênio.…”

“…Muitos trabalhos tratam do ancoramento e caracterização do óxido de rênio (Re 2 O 7 ) sobre superfícies de sílica, alumina ou nióbio. Existem também trabalhos sobre reações de metátese aplicada à óleoquimica 28,29 . A Profa.…”

“…Faz-se uma abordagem sucinta sobre metátese de olefinas, mas não é de interesse apresentar um levantamento bibliográfico da literatura. Excelentes trabalhos de revisão têm sido publicados com este objetivo [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18] , inclusive na língua portuguesa [23][24][25][26][27][28][29][30][31][32][33][34][35][36][37][38][39][40][41] . Assim, recomenda-se aos leitores que consultem a literatura e que fiquem atentos às novidades, dado o número crescente de trabalhos que vêm sendo divulgados.…”