Oxymetallation. Part 24. Preparation of cyclic peroxides by cycloperoxymercuriation of unsaturated hydroperoxides.
作者:A.J. Bloodworth、Richard J. Curtis、Michael D. Spencer、Neil A. Tallant
DOI:10.1016/s0040-4020(01)86350-x
日期:1993.3
Seventeen unsaturated hydroperoxides have been converted by treatment with mercury(II) acetate and/or mercury(II) nitrate into nineteen new mercuriated cyclic peroxides and by subsequent demercuriation with alkaline sodium borohydride, six new mercury-free peroxides have been isolated. The results greatly extend the range of such reactions and provide information about the stereoselectivities and relative
An electron spin resonance study of the regioselectivity of the cyclization of protonated and unprotonated pent-4-en-1-oxyl and pent-4-en-1-peroxyl radicals
作者:A. J. Bloodworth、Alwyn G. Davies、Robyn S. Hay-Motherwell
DOI:10.1039/p29880000575
日期:——
The regioselectivity of the ring closure of protonated and unprotonatedpent-4-en-1-oxylradicals has been determined by monitoring by e.s.r. spectroscopy the radicals which are formed when the corresponding pent-4-enyl peroxides (2; R = H or Me) are photolysed in solution. [graphic omitted]
质子化和未质子化的戊-4-烯-1-氧基的闭环的区域选择性已通过电子能谱法监测了相应的戊-4-烯基过氧化物形成的自由基(2; R = H或Me )在溶液中被光解。[图形省略]
Viability of 4,5-Dihydro-1,2,3,4-oxatriazoles Reinvestigated
作者:Samia Firdous、Klaus Banert、Alexander A. Auer
DOI:10.1002/chem.201100231
日期:2011.5.9
The first procedures to prepare 4‐bromo‐4‐methylpentanal and 4‐azido‐4‐methylpentanal are reported. The latter compound and also the parent 4‐azidobutanal do not lead to 4,5‐dihydro‐1,2,3,4‐oxatriazoles by intramolecular 1,3‐dipolar cycloaddition, although it was claimed to be so in the literature. The NMR spectroscopic data of such heterocycles reported previously do not agree with those of similar
报道了制备4-溴-4-甲基戊醛和4-叠氮基-4-甲基戊醛的第一步骤。后者的化合物以及母体的4-叠氮基丁醛通过分子内的1,3-偶极环加成反应不会产生4,5-二氢-1,2,3,4-氧杂三唑,尽管在文献中据称是这样。先前报道的此类杂环的NMR光谱数据与类似物质的数据不一致,并且与通过量子化学方法在本工作中计算出的13 C NMR光谱化学位移不兼容。这些计算进一步表明,分子内环加成4-叠氮基丁醛以生成标题化合物是强吸热的,因此很可能是不可能的。
AlCl<sub>3</sub>‐Promoted Conia‐Ene‐Related Cyclization of α,ω‐Diethylenic Ketones and 1,2‐ or 1,3‐Hydroalkenylation of Unactivated Cyclopropanes
作者:Julien Coulomb
DOI:10.1002/adsc.202300317
日期:2023.9.5
α,β-Unsaturated enones possessing an unactivated olefin at the ϵ-, ζ- or η-position underwent an aluminum chloride-promoted Conia-ene-related cyclization, affording unsaturated decalones or hexahydroindenones in generally good yields. Cyclopropanes could be used as olefin surrogates in this process, leading to the same bicyclic products in slightly improved efficiency as the result of 1,2- or 1,3-hydroalkenylation