Synthesis and Structures of <i>cis</i>- and <i>trans</i>-Bis(alkyneselenolato)platinum(II) Complexes
作者:Sven Schäfer、Carmen Moser、Jürgen J. Tirrée、Martin Nieger、Rudolf Pietschnig
DOI:10.1021/ic048454a
日期:2005.4.1
CH(2)Cl(2) to the preferred trans form trans-3. The closely related cis-[Pt(dppf)(2)(SeCC-n-C(5)H(11))(2)] (4) (dppf = bis(diphenylphosphino)ferrocene) was prepared by a similar metathetical reaction using the platinum chloride complex of the chelating dppf to impose the cis geometry. The structures of the cis and trans complexes have been investigated in solution by heteronuclear NMR ((31)P, (77)Se
The reaction of lithium trialkylalkynylborate with methanesulphinyl chloride
作者:M. Naruse、K. Utimoto、H. Nozaki
DOI:10.1016/s0040-4020(01)97353-3
日期:1974.1
Treatment of lithium trialkylalkynylborates (1) with methanesulphinyl chloride gives internal acetylenes (2) in good yields. The reaction proceeds via β-methanesulphinylvinylboranes 3, followed by cis elimination of methanesulphinyl group and dialkylboron groups. The reaction mixture of B-alkyl-9-BBN and 1-lithio-1-heptyne has been treated with methanesulphinyl chloride to provide mainly a cyclooctane
A new, highly stereoselective approach to pyrrolidines via overall 5-endo-trig cyclisations of homoallylic tosylamides
作者:Andrew D. Jones、David W. Knight
DOI:10.1039/cc9960000915
日期:——
Iodocyclisations of E-homoallylic tosylamides 7 lead to excellent yields of either 2,5-trans-or 2,5-cis-3-iodopyrrolidines (10 or 11), depending upon the reaction conditions.
Optimised total syntheses of the F-furan fatty acids F 5 and F 6 and some deuterated derivatives
作者:David W. Knight、Andrew W.T. Smith
DOI:10.1016/j.tet.2015.05.061
日期:2015.9
with methyl lithium, which gave trideuterated derivatives 16 of the F6 acid by using CD3Li. The two acids 2 and 3 proved very unstable; thus, if samples are to be stored for extended periods, this should be as an ester and not as the free acids. This instability does raise questions regarding previously determined levels of these free acids (and perhaps some of their structurally close relatives) in various