Conversions of phenylalkynylcyclopentanols to α-iodoenones
摘要:
N-Iodosuccinimide and catalytic amounts of Koser's reagent react with phenylalkynylcyclopentanols to afford alpha-iodoenones. No ring expansions occur.
Hypoiodous acid initiated rearrangement of tertiary propargylic alcohols to α-iodoenones
作者:Wesley J. Moran、Arantxa Rodríguez
DOI:10.1039/c2ob26360b
日期:——
In the presence of an oxidant, sodium iodide is converted into hypoiodous acid which effects the rearrangement of tertiary propargylic alcohols to α-iodoenones in good yields.
在氧化剂存在下,碘化钠转化为 次碘酸 从而以高收率将叔炔丙醇重排为α-碘烯。
Structure of 2-Methyl-1-(phenylethynyl)cyclopentanol and of Its Co2(CO)6 and (C5H5)2Mo2(CO)4 Cluster Complexes Co2(CO)6 as a Conformational Switch
作者:Krisztina L. Malisza、Luc Girard、Donald W. Hughes、James F. Britten、Michael J. McGlinchey
DOI:10.1021/om00010a035
日期:1995.10
Treatment of 2-methylcyclopentanone with PhC=CMgBr yields 2-methyl-1-(phenylethynyl)cyclopentanol (6'), in which the alkynyl group is axial and cis to the methyl substituent. Reaction with Co-2(CO)(8) gives the cluster complex 9, in which the (alkynyl)Co-2(CO)(6), group adopts an equatorial position and the hydroxyl and methyl groups are now axial. in contrast, (C5H5)(2)Mo-2(CO)(4) reacts with 6' to produce (2-methyl-1-(phenylethynyl)cyclopentene)Mo-2(CO)(4)-(C5H5)(2), (19). The alkyne, 6' and also the cobalt and molybdenum complexes, 9 and 19 have all been characterized by X-ray crystallography. The observed preference for the bulky (RC=C)Co-2(CO)(6) substituent to occupy an equatorial site in cycloalkanes may be used to rationalize the stereospecificity of the Friedel-Crafts cyclization of cobalt-stabilized propargyl cations onto suitably activated aromatic rings.
SYNTHESIS OF HALOENONES AND ARYL OR ALKYL SUBSTITUTED ENONES OR ALKENES