A Facile, Convenient, and Green Route to (E)-Propenylbenzene Flavors and Fragrances by Alkene Isomerization
作者:Douglas Grotjahn、Casey Larsen、Erik Paulson、Gulin Erdogan
DOI:10.1055/s-0035-1560205
日期:——
(E)-Propenylbenzene flavors and fragrances can be made andisolated in high yield and selectivity by using bifunctional catalyst 1, andthe heterogenized analogues. Multigram-scale reactions can be performed neat and the products isolated either by distillation, using homogeneous catalyst 1 (0.1-0.5 mol%, r.t., 10-45 min), or by decantation from heterogeneous catalysts PS-1 or PSL-1 (0.5 mol%, 70 degrees C, 24 h; catalyst separation and re-use shown for 3-4 cycles; 10 cycles using distilled eugenol feedstock). Both purified starting materials and essential oil feedstocks could be used. Z Isomers were present at very low levels (from 0.4% to less than 0.1%) in the products.
(E)-丙烯基苯菲 synthetic 和分离可以高效、高选择性地通过双功能催化剂1以及异构物进行。多igram级反应可以在天然下进行,并且产物可以通过蒸馏(使用均匀催化剂1,0.1-0.5 mol%,室温,10-45分钟)或通过不均匀催化剂PS-1或PSL-1(0.5 mol%,70摄氏度,24小时;催化物分离和重新使用在3-4个循环中,10个循环使用蒸馏后的乙基琼脂醇环境)从不均匀催化剂中分离。这两种纯化后的基础材料和精油原料都可以使用。产物中Z异构体含量极低,从0.4%到低于0.1%。