Regiochemistry and solvent effect on the reaction of 1-selenoallyl cations with N-methylpyrrole
作者:Michel Renard、L�szl� Hevesi
DOI:10.1039/c39860000688
日期:——
Unsubstituted 1-methylseleno- and/or 1-phenylseleno-allyl cations undergo Friedel–Crafts reaction with N-methylpyrrole at their position 3 to give the adduct (4) while 1-seleno-3-dialkylallyl cations lead to (7) or (9) in a highly solvent dependent manner, presumably via(5) which cannot be isolated.
Preparation of 3-hydroxyl-vinyl selenides and 1,3-bis(seleeno)-propenes
作者:M. Renard、L. Hevesi
DOI:10.1016/s0040-4020(01)91434-6
日期:1985.1
Hydroselenation of alkynes using NaBH4/BMIMBF4: easy access to vinyl selenides
作者:Eder J. Lenardão、Luiz G. Dutra、Maiara T. Saraiva、Raquel G. Jacob、Gelson Perin
DOI:10.1016/j.tetlet.2007.09.042
日期:2007.11
A general and easy method for the synthesis of several vinyl selenides using NaBH4 and BMIMBF4 as a recyclable solvent is described. This efficient and improved method furnishes the corresponding vinyl chalcogenides preferentially with Z configuration. We also observed that when the same protocol was applied to phenyl acetylene, (E)-bis-phenylseleno styrene was obtained in good yield and with high selectivity. (c) 2007 Elsevier Ltd. All rights reserved.
Addition of chalcogenolate anions to terminal alkynes using microwave and solvent-free conditions: easy access to bis-organochalcogen alkenes
作者:Gelson Perin、Raquel G. Jacob、Luiz G. Dutra、Francisco de Azambuja、Greice F.F. dos Santos、Eder J. Lenardão
DOI:10.1016/j.tetlet.2005.11.158
日期:2006.2
We present here the reaction of diphenyl dichalcogenides (Se and Te) with propargyl alcohols using alumina supported sodium borohydride under solvent-free conditions. This efficient and improved method is general and furnishes the corresponding vinyl chalcogenide preferentially with a Z configuration. We also observed that when the same protocol was applied to phenyl acetylene, the (E)-bis-organochalcogen alkenes were obtained in good yields and high selectivity. The use of MW irradiation facilitates the procedure and accelerates the reaction. (c) 2005 Elsevier Ltd. All rights reserved.
RENARD, M.;HEVESI, L., TETRAHEDRON LETT., 1985, 26, N 15, 1885-1888