<sup>1</sup>H-NMR.-spektroskopische Analyse von prochiralen Allencarbonsäureestern mit optisch aktiven Europium-Verschiebungsreagenzien
作者:Robert W. Lang、Hans-Jügen Hansen
DOI:10.1002/hlca.19790620510
日期:1979.7.17
1H-NMR. Spectroscopic Analysis of Prochiral Allenic Esters Using Optically Active Europium Shift Reagents
1 H-NMR。使用旋光Euro转移试剂的前手性烯丙酯的光谱分析
Metal-Free Transfer Hydroiodination of C–C Multiple Bonds
作者:Weiqiang Chen、Johannes C. L. Walker、Martin Oestreich
DOI:10.1021/jacs.8b12318
日期:2019.1.16
The design and a gram-scalesynthesis of a bench-stable cyclohexa-1,4-diene-based surrogate of gaseous hydrogen iodide are described. By initiation with a moderately strong Brønsted acid, hydrogen iodide is transferred from the surrogate onto C-C multiple bonds such as alkynes and allenes without the involvement of free hydrogen iodide. The surrogate fragments into toluene and ethylene, easy-to-remove
描述了基于环己-1,4-二烯的气态碘化氢替代品的设计和克级合成。通过用中等强度的布朗斯台德酸引发,碘化氢从替代物转移到 CC 多重键上,例如炔烃和丙二烯,而没有游离碘化氢的参与。代用品碎片化为甲苯和乙烯,易挥发废物。这种氢碘化反应避免了对碘化氢或氢碘酸的不稳定处理。通过这种方式,可以以立体控制的方式访问范围广泛的以前未知或难以制备的乙烯基碘。
Regioselective carboannulation of electron-deficient allenes with dialkyl (2-formylphenyl)malonates leading to multisubstituted naphthalenes
作者:Nagaraju Koppanathi、K. C. Kumara Swamy
DOI:10.1039/c6ob00787b
日期:——
An efficient base-catalysed regioselective carboannulation of allenoates (or allenylphosphonates) with dialkyl 2-(2-formylphenyl)malonates that leads to multi-substituted naphthalenes in high yields has been developed. This cascade reaction proceeds through Michael addition, cyclisation, dealkoxycarboxylation and tautomerisation. By using an allenylphosphine oxide, a species analogous to one of the
Allenyl esters as quenching agents for ruthenium olefin metathesis catalysts
作者:Animesh Roy、Maximilian A. Silvestri、Robert A. Hall、Salvatore D. Lepore
DOI:10.1016/j.tetlet.2016.11.121
日期:2017.1
esters through a metathesis coupling of unsubstituted allenyl esters and alkenes using a variety of rutheniumcatalysts, it was discovered that allenyl esters themselves cleanly arrested the activity of the catalysts. Further studies suggests possible utility of allene esters as general quenching agents for metathesis reactions. To explore this idea, several representative olefin metathesis reactions, including
Hypervalent iodine oxidation of 5-substituted and 5-methyl-4-substituted pyrazol-3(2H)-ones. A facile synthesis of 2-alkynoic and 2,3-allenic esters
作者:Robert M. Moriarty、Radhe K. Vaid、Payman Farid
DOI:10.1039/c39870000711
日期:——
Phl(OAc)2–MeOH causes oxidation of 5-substitutedpyrazol-3(2H)-ones to the 2-alkynoic methyl ester and 5-methyl-4-substitutedpyrazol-3(2H)-ones to the 2,3-allenic methyl ester.