Highly Selective Hydroaminomethylation of Internal Alkenes To Give Linear Amines
作者:Moballigh Ahmed、Raymond P. J. Bronger、Ralf Jackstell、Paul C. J. Kamer、Piet W. N. M. van Leeuwen、Matthias Beller
DOI:10.1002/chem.200600702
日期:2006.12.4
internal olefins and mixtures of internal and terminalolefins have been converted highly selectively into linearamines. Investigations of the effects of the calculated natural bite angles of ligands on hydroaminomethylation shows that the regioselectivity for the linear product follows a similar trend to that seen in the hydroformylation of internal alkenes with the aid of these ligands. Hydroaminomethylation
Synthesis of β-aryl ketones by tetraphosphine/palladium catalysed Heck reactions of 2- or 3-substituted allylic alcohols with aryl bromides
作者:Florian Berthiol、Henri Doucet、Maurice Santelli
DOI:10.1016/j.tet.2006.02.061
日期:2006.5
4-tetrakis(diphenylphosphinomethyl)cyclopentane as a catalyst, a range of aryl bromides undergoes Heck reaction using 2- or 3-subtituted allylic alcohols. With these sterically congested alkenes, the selective formation of β-aryl ketones was observed when appropriate reaction conditions were used. The influence of the functional group on the aryl bromide and of the base on the selectivity is remarkable. With several
通过使用[PdCl(C 3 H 5)] 2 /顺式,顺式,顺式,1,2,3,4-四(二苯基膦甲基)环戊烷作为催化剂,一系列芳基溴化物使用2-或2-羟基进行Heck反应。 3位取代的烯丙醇。对于这些空间上拥挤的烯烃,当使用适当的反应条件时,观察到β-芳基酮的选择性形成。官能团对芳基溴化物和碱对选择性的影响是显着的。使用几种底物,使用NaHCO 3代替K 2 CO 3可获得更高的选择性。作为基础。此外,该催化剂可在低负荷下与多种底物一起使用。
Metal-catalyzed organic photoreactions. Chemo- and regioselectivities in the CuCl2-induced photooxidation of olefins
作者:Tadashi Sato、Shin-ichi Yonemochi
DOI:10.1016/s0040-4020(01)90468-5
日期:——
Copper(II) chloride induced the chemo and regioselective chlorohydroperoxidation, as well as the site-selective chlorination of olefins, under photooxygenation conditions.
氯化铜(II)在光氧合条件下诱导了化学和区域选择性的氯代氢过氧化作用,以及烯烃的位点选择性氯化。
New Volatile Sulfur-Containing Constituents in a Simultaneous Distillation−Extraction Extract of Red Bell Peppers (Capsicum annuum)
作者:Regula Naef、Alain Velluz、Alain Jaquier
DOI:10.1021/jf072493y
日期:2008.1.1
mercapto-alcohols 17, 18, and 30, the dithiols 19 and 28, the methylthio-thiols 20 and 21, and the thiophene-thiol 31) and the two new dithiolanes 10 and 29. All of them are structurally related to the unsaturated C7- and C9-ketones 1- 4. The free thiols were enriched using Affi-Gel 501 ( p-aminophenyl-mercuric acetate grafted on an agarose gel). The new compounds were confirmed by syntheses and were organoleptically
Ketone-directed peracid epoxidation of cyclic alkenes
作者:Alan Armstrong、Paul A. Barsanti、Paul A. Clarke、Anthony Wood
DOI:10.1039/p19960001373
日期:——
Ketone carbonyl groups are shown to direct the peracidepoxidation of cyclic alkenes with greater selectivity than that displayed by esters. An 18O labelling study is used to show that a dioxirane intermediate is not involved in these reactions.