作者:Tuong Anh To、Chao Pei、Rene M. Koenigs、Thanh Vinh Nguyen
DOI:10.1002/anie.202117366
日期:2022.3.21
H-bonding network: Hexafluoroisopropanol (HFIP) can act as a hydrogen-bond donor to enhance the catalytic efficiency of simple Brønsted acid catalysts in carbonyl-olefin metathesis reactions by stabilization of all transition states and intermediates along the reaction pathway.
Homo- and spiroconjugative effects in the sigmatropic rearrangement of 1,1′-spirobiindenes
作者:Herbert Kiesele
DOI:10.1016/s0040-4039(01)90246-1
日期:——
Due to homoconjugative interactions 2,3-dihydro-1,1′-spirobiindene and 1,1′-spirobiidene yields isomeric benzofluorenes in thermal, photochemical, and electron transfer induced rearrangement.
The carbonyl–olefin metathesis (COM) reaction is an attractive approach for the formation of a new carbon–carbon double bond from a carbonyl precursor. In principle, this reaction can be promoted by the activation of the carbonyl group with a Brønsted acid catalyst; however, it is often complicated as a result of unwanted side reactions under acidic conditions. Thus, there have been only a very few
羰基-烯烃复分解 (COM) 反应是从羰基前体形成新的碳-碳双键的一种有吸引力的方法。原则上,该反应可以通过用布朗斯台德酸催化剂活化羰基来促进;然而,由于在酸性条件下发生不希望的副反应,它通常很复杂。因此,只有极少数的布朗斯台德酸催化 COM 反应的例子,所有这些都需要专门设计的装置。在此,我们报告了一种新的实用均相布朗斯台德酸催化方案,该方案使用硝基甲烷(一种容易获得的溶剂)来促进分子内闭环 COM 反应。
Banciu, M. D.; Stanescu, M. D.; Florea, C., Bulletin de la Societe Chimique de France, 1991, # 6, p. 919 - 925
作者:Banciu, M. D.、Stanescu, M. D.、Florea, C.、Petride, A.、Draghici, C.、Cioranescu, E.