Chemoselective and stereospecific iodination of alkynes using sulfonium iodate(<scp>i</scp>) salt
作者:Dodla S. Rao、Thurpu R. Reddy、Sudhir Kashyap
DOI:10.1039/c7ob03076b
日期:——
An efficient and highly chemoselective iodination of alkynes using a sulfoniumiodate(I) electrophilc reagent under metal-free conditions has been realized. The reactivity of sulfoniumiodate(I) salt could be significantly diverse in the presence of water as the solvent, enabling the (E)-1,2-diiodoalkenes stereospecifically. This stereodivergent approach is amenable to a wide range of alkyne substrates
An aqueous medium-controlled stereospecific oxidative iodination of alkynes: efficient access to (<i>E</i>)-diiodoalkene derivatives
作者:Rammurthy Banothu、Swamy Peraka、Srujana Kodumuri、Durgaiah Chevella、Krishna Sai Gajula、Vasu Amrutham、Divya Rohini Yennamaneni、Narender Nama
DOI:10.1039/c8nj03929a
日期:——
A new and versatile approach for the stereospecific iodination of alkynes has been developed in aqueous media. Scale-up reactions (up to 5 g) established the proficiency of this protocol and highlight the feasibility of large scale reactions.
(NH4)2S2O8-Mediated Diiodination of Alkynes with Iodide in Water: Stereospecific Synthesis of (E)-Diiodoalkenes
作者:Can-Cheng Guo、Qing Jiang、Jing-Yu Wang
DOI:10.1055/s-0034-1379910
日期:——
A new approach to the stereospecific diiodination of alkynes under mild conditions has been developed. This protocol employs ammonium persulfate as an oxidant and iodide as an iodine source, and provides a highly efficient and general method for the preparation of a broad range of (E)-diiodoalkenes in water.
The torsional stability of a cylinder subject to finite perturbations
作者:A. N. Sporykhin、V. A. Sumin
DOI:10.1007/bf02681925
日期:2000.3
The problem of torsional stability of a circular cylinder made from a compressible nonlinearly elastic material is solved for finite perturbations. In contrast to the classical theory of bifurcation, an infinite sequence of steady states that bounds the domain of allowed initial perturbations is constructed. The applicability of the classical three-dimensional linear theory of stability is evaluated.