5912-93-6Relevant academic research and scientific papers
Iodine(III)-Mediated Oxidative Hydrolysis of Haloalkenes: Access to α-Halo Ketones by a Release-and-Catch Mechanism
Jobin-Des Lauriers, Antoine,Legault, Claude Y.
supporting information, p. 108 - 111 (2016/01/15)
An unprecedented iodine(III)-mediated oxidative transposition of vinyl halides has been accomplished. The products obtained, α-halo ketones, are useful and polyvalent synthetic precursors. There are only a handful of reported examples of the direct conversion of vinyl halides to their corresponding α-halo carbonyl compounds. Insights into the mechanism and demonstration that this synthetic transformation can be done under enantioselective conditions are reported.
Synthesis of novel thermally reversible photochromic spiro[adamantane-2,7′(6′H)-benzothiophene]
Yokoyama, Yasushi,Nagashima, Hitoshi,Man, Sujen,Yokoyama, Shrestha Yayoi,Takada, Kensaku
, p. 355 - 361 (2007/10/03)
A new thermally reversible photochromic compound, 4′,5′-hexafluoropropano-6′-phenylspiro[adamantane-2, 7′(6′H)-benzothiophene], derived from UV-irradiation of 2-(1-adamantylidene-1-phenylmethyl)-3,3,4,4,5,5-hexafluoro-1- (3-thienyl)cyclopentene via the ph
Competition of Mechanisms in Nucleophilic Substitution of Vinyl Halides. An Unequivocal Example of the Vinylic SRN1 Route
Galli, Carlo,Gentili, Patrizia,Rappoport, Zvi
, p. 6786 - 6795 (2007/10/02)
In a search for an unambiguous example of the vinylic SRN1 route, several vinyl bromides and iodides were reacted mostly with (-)CH2COCMe3, and sometimes with (-)CH2COPh, (-)CH(Me)COEt, and (EtO)2PO(-) ions, under Fe(2+)- or photostimulation in Me2SO.Vinyl halides having vinylic hydrogens, such as β-bromostyrene, gave acetylenic products, e.g., phenylacetylene or a tertiary PhCC-substituted alcohol, whereas vinyl halides with allylic hydrogens, such as Me2C=C(I)CHMe2, gave a substituted allene.Reduction products of the halogen, as well as substitution and rearranged substitution products, were also formed.The operation of ionic elimination-addition routes accounts for formation of most of the products, while the reduction products arise from an intermediate vinyl radical.Ph2C=C(Br)Ph (20) and Me2C=C(Br)Ph (25) gave both substitution and reduction products, but Me2C=C(Br)-t-Bu (23) gave only a reduction product.Formation of substitution products from the conjugated 20 and 25 was ascribed to a reaction via a vinylic SRN1 route, while lack of substitution in 23 is related to its nonconjugated system and to the consequent higher energy that the radical anion of the substitution product would have.The one here reported seems to be the first case of an exclusive genuine vinylic SRN1 process.
Alkenyl bromides by brominative deoxygenation of ketones in one or two steps
Von Roman,Ruhdorfer,Knorr
, p. 985 - 992 (2007/10/02)
The conversion of ketones into alkenyl bromides is accomplished in one or two steps by 2,2,2-tribromo-2,2-dihydro-1,3,2-benzodioxaphosphole or by the dibromomethyl methyl ether prepared therefrom. Investigations of the scope and limitations provide some hints for the preparative planning and improvement.
ANODIC FUNCTIONALIZATION OF OLEFINS IN ALCOHOLS IN THE PRESENCE OF HALIDE SALTS
Elinson, M. N.,Makhova, I. V.,Nikishin, G. I.
, p. 112 - 118 (2007/10/02)
Electrolysis of conjugated, unbranched arylolefins in the presence of alkali metal halides in alcohols affords 1-aryl-2-bromoketals in 60-90percent yields.Under these conditions, 2-methyl-1-phenylprop-1-ene is converted into 1-bromo-2-methyl-1-phenylprop-1-ene in 80percent yield, and arylolefins with no benzylidene hydrogens give 1-aryl-1-alkoxy-2-bromoalkanes.
The α-Vinylation of β-Dicarbonyl Compounds by Alk-1-enyl-lead Triacetates
Moloney, Mark G.,Pinhey, John T.
, p. 2847 - 2854 (2007/10/02)
Treatment of (E,E)-distyrylmercury (1) with lead tetra-acetate gave a mixture of (E)-styrylmercury acetate (3) and (E)-styryl-lead triacetate (2), which decomposed to (E)-styryl acetate (4) and lead(II) acetate.The vinyl-lead compound (2), generated in this way, reacted rapidly with β-keto ester (5) to give the α-(E)-styryl derivative (6) in synthetically useful yield.This procedure for the α-vinylation of (5) has been applied to the divinylmercury compounds (7)-(13), and to the synthesis of the α-(E)-styryl β-dicarbonyl compounds (28), (30), (32), and (34).Compounds (6), (28), (30), (32), and (34).Compounds (6), (28), (30), (32), and (34) have also been produced by reaction with lead compound (2) generated by reaction of tributyl-(E)-styrylstannane (36) and lead tetra-acetate.Isolation of the relatively stable cyclopent-1-enyl-lead triacetate (21b), and its reaction with keto ester (5) to give a quantitative yield of compound (18), provided evidence that vinyl-lead triacetates are the vinylating species.
2-Methyl-1-phenyl-1-propenyllithium. A Vinyllithium Derivative Showing Catalyzed Transmetalation
Knorr, Rudolf,Lattke, Ernst
, p. 2116 - 2131 (2007/10/02)
Full preparative and kinetic details are given for the apparent vinyl-to-allyl anion rearrangement of the title compound 1.The rapid and quantitative formation of the allyllithium derivative 7 is shown to be catalyzed by 2-methyl-1-phenyl-1-propene (2).An intermolecular transmetalation mechanism with de-aggregation and ionization steps is suggested to explain the orders of reaction, parameters of activation, and solvent dependency.
