Ninhydrin reaction with phenylethylamine: unavoidable by-products
作者:Andrés Gonzalez-Oñate、Rodolfo Quevedo
DOI:10.1007/s12039-020-1751-1
日期:2020.12
Abstract Ninhydrin and phenylethylamine reacted to form a complex mixture from which four products were isolated: a benzo-fused spiroheterocyclic and a pyrrole product resulting from tricomponent condensation between ninhydrin, phenylethylamine and phenylacetaldehyde produced in situ, a 2-amino-1,3-indandione dimerisation-dehydrogenation product and a Schiff base. This article analyses these compounds’
Using Molecular Architecture to Control the Reactivity of a Triplet Vinylnitrene
作者:Sujan K. Sarkar、Onyinye Osisioma、William L. Karney、Manabu Abe、Anna D. Gudmundsdottir
DOI:10.1021/jacs.6b05746
日期:2016.11.16
Photolysis of 3-azido-1-indenone (1) with a light-emitting diode (LED, λ = 405 nm) or mercury arc lamp (Pyrex) resulted in the formation of heterodimer 3 in excellent yield, through dimerization of triplet vinylnitrene 32. At ambient temperature, vinylnitrene 32 (λmax at 340 and 480 nm) was detected directly with laser flash photolysis of vinyl azide 1. The vinylnitrene intermediate was also characterized
synthesis and isolation of a stable triplet conjugated diradical, 10,12‐diaryldiindeno[1,2‐b:2′,1′‐e]pyrazine (m‐DIP). With the m‐xylylene analogue skeleton containing electron‐deficient sp2‐nitrogen atoms, m‐DIP displays significant aromatic character within its pyrazine ring and its spin density mainly delocalizes on the meta‐pyrazine unit, making it a tripletgroundstate conjugated diradical. Our work
高旋转共轭自由基在磁性材料和有机自旋电子学中具有巨大潜力。然而,由于它们的稳定性差,获得高自旋共轭基团仍然非常具有挑战性。我们报告了成功的合成和分离的稳定的三重态共轭双自由基10,12-diaryldiindeno [1,2- b:2',1'- e ]吡嗪(m- DIP)。与米-xylylene含有缺电子类似物骨架SP 2 -氮原子,米-dip显示其吡嗪环内显著芳香性和其自旋密度主要离域上的元-吡嗪单元,使其成为三重态基态共轭双自由基。我们的工作为稳定的高旋转共轭自由基提供了有效的“旋转密度调节”策略。