环加成反应（cycloaddition reaction）是在光或热的条件下，两个或多个不饱和分子通过双键相互加成生成环状化合物的反应。环加成反应在反应过程中不消除小分子，而且只生成σ-键，而没有σ-键的断裂。Diels-Alder反应就是典型的环加成反应。例如：一切现有的实验证据表明，环加成反应也是一个协同过程。环加...
DFT calculations predict that the [8 + 2] cycloaddition reaction between ketenes and 8-azaheptafulvenes occurs stepwise through antiaromatic zwitterionic intermediates. With adequate modifications of both the electronic properties of the ketene and the reaction conditions, these elusive intermediates have...
[6+4]以及形式[4+2]等环加成反应,反应的选择性由2-环烯酮的环大小以及三庚烯酮的取代基控制,得到的手性产物可以发生各种不同的化学反应或光化学反应进而合成全碳多环骨架。
[reaction: see text] The Z and E nitrones 38 and 39 from condensation of aldehyde 20 with hydroxylamine 36 underwent intramolecular dipolar cycloaddition t... JD White,JD Hansen 被引量: 0发表: 2020年 Identification of risk factors for carbamazepine-induced serious mucocutaneous adverse reactions:...
The reaction proceeds through a formal [4+2] cycloaddition between an intermediate formed in situ between 1, Zn(II) chloride and alkyne (2) followed by a retro Diels-Alder step. Developed method provides the desired heterocyclic compounds in high yields under mild reaction conditions. ...
2.Not all catenanes with oriented rings are topologically chiral. 并非所有具有定向环的索烯都是拓扑手性的。 3.Arenes participate in 1,3-dipolar cycloaddition with in situ-generated diazoalkenes. 芳烃参与与原位生成的重氮烯烃的 1,3-偶极环加成反应。
One-flask synthesis of 1,3,5-trisubstituted 1,2,4-triazoles from nitriles and hydrazonoyl chlorides via 1,3-dipolar cycloaddition A one-flask strategy for the synthesis of 1,3,5-trisubstituted 1,2,4-triazoles 4a–s and 8a and b from nitriles 5a–i with N-arylhydrazonoyl h...
Rh-catalyzed regio-, diastereo-, and enantioselective [2+2+2] cycloaddition of 1,6-enynes with acrylamides.相关化合物 208248-66-2 (R)-5,5',6,6',7,7',8,8'-八氢-[1,1'-联萘]-2,2'-二胺 139139-93-8 (S)-(-)-2,2'-双(二苯磷基)-5,5',6,6',7,7',8,8'-八氢-1,...
A novel reaction of 7,7,8,8-tetracyanoquinodimethane (TCNQ): charge-transfer chromophores by [2 + 2] cycloaddition with alkynes Kivala M, Boudon C, Gisselbrecht JP, Seiler P, Gross M, Diederich F (2007) A novel reaction of 7,7,8,8-tetracyanoquinodimethane (TCNQ): charge... M ...
A solid noncovalent organic double-helix framework catalyzes asymmetric [6 + 4] cycloaddition 固体非共价有机双螺旋框架催化不对称 [6 + 4] 环加成 (导读 菜菜)不对称环加成反应是化学合成中的一种强有力的转化,其中 [4 + 2] 环加成是化学家合成武器库中最强大的工具之一。本研究报告了高酸性和受限的亚...