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L-Phenyl-2-propene

The reduction of a dinitro ketone to an azo ketone is best achieved with glucose. 2,2 -Dinitrobenzophenone treated with glucose in methanolic sodium hydroxide at 60° afforded 82% of dibenzo[c,f [i 2]diazepin-l 1-one whereas lithium aluminum hydride yielded 24% of bis(o-nitrophenyl)methanol [575], Conversion of aromatic nitro ketones with a nitro group in the ring into amino ketones has been achieved by means of stannous chloride, which reduced 4-chloro-3-nitroacetophenone to 3-amino-4-chloroacetophenone in 91% yield [178]. A more dependable reagent for this purpose proved to be iron which, in acidic medium, reduced m-nitroacetophenone to m-aminoacetophenone in 80% yield and o-nitrobenzophenone to o-aminobenzophenone in 89% yield (stannous chloride was unsuccessful in the latter case) [903]. Iron has also been used for the reduction of o-nitrochalcone, 3-(o-nitrophenyl)-l-phenyl-2-propen-l-one, to 3-(o-aminophenyl)-l-phenyl-2-propen-l-one in 80% yield [555]. [Pg.124]

Problem 13.42 Why does dehydration of l-phenyl-2-propanol in acid form l-phenyl-l-propene rather than l-phenyl-2-propene ... [Pg.285]

Phenyl-l-propene, PhCH=CHCH, is a more highly substituted alkene and therefore more stable than l-phenyl-2-propene, PhCH2CH=CH,. Even more important, it is more stable because the double bond is conjugated with the ring. [Pg.285]

Table 5.25. Acidity Dependence of Cyclization of l-Phenyl-2-propen-l-ones316... Table 5.25. Acidity Dependence of Cyclization of l-Phenyl-2-propen-l-ones316...
Kinetic studies by Doering and his collaborators at Harvardbased on five sets of chiral 1,2-disubstituted cyclopropanes, with 1-cyano, 2-(phenyl or propen-2 -yl or -( )-propenyl or phenylethynyl) (3) and l-phenyl-2-(propen-2 -yl) (4) substitution, established the ralative rotational propensities of these substituents and tested the proposition that they might be related to substituent moments of inertia. In all of these cases, the balance between one-center and two-center epimerizations from a trans isomer, reflected in (ki + k2) k 2y was fairly constant, ranging from 1.4 1 to 2.1 1. The kinetic advantages for one-center epimerizations at cyano-substituted carbons for the four cases studied were modest and not especially system-dependent the k. k2 ratios were 2.5,2.2,2.4 and 1.8, thus establishing that rotational propensities are not dictated by some simple function of the moments of inertia of substituents. [Pg.473]

SYNS CHALCONE, 4-METHYL-(6CI,7CI,8CI) (4-METHYLBENZYLIDENE)ACETOPHENONE p-METHYLCHALCONE 3-(4-METHYLPHENYL)-l-PHENYL-2-PROPEN-1-ONE PHENYL p-METHYLSTYRYL KETONE 2-PROPEN-l-ONE,3-(4-METHYLPHENYL)-1-PHENYI ... [Pg.910]

The asymmetric [2,3]sigmatropic rearrangement of several other allyl aryl selenides has been reported, but only moderate selectivities are observed [27] (Scheme 18). The oxidation of cinnamyl and geranyl selenides derived from L-prolinol with MCPBA at -90°C afforded the chiral l-phenyl-2-propen-l-ol and linalool with moderate enantiomeric excess, respectively. [Pg.218]

Fig, 4, Concentration dependences of l-phenyl-2-propene (A) and 1-propenyl phenyl ether (B) in the competitive hydrogenation with 2-propene-l-ol. [Pg.366]

A mixture of 3-(4-methylphenyl)-l-phenyl-2-propen-l-one (0.444 g, 2 mmol) and cyclohexyl isocyanide (0.218 g, 2 mmol) was stirred at 150 °C for 30 min. The reaction mixture was then cooled to room temperature and the residue was purified by column chromatography using 1 2 n-hexane-EtOAc as eluent. The solvent was removed and the solid residue was recrystallized from 1 1 n-hexane-EtOAc to afford 3a as colorless crystals, mp 160-162°C, yield 0.64 g, 92%. [Pg.123]

Kinetic Resolution of 2-Phenylsulfonyl-l-phenyl-2-propen-l-ol (Entry 4) ... [Pg.1028]

Carboxonium ions are highly stabilized by strong oxygen participation and therefore are much less reactive compared to alkyl cations. However, under the superelectrophilic solvation by triflic acid, the Friedel-Crafts-type reactions stiU can occur via a protosolvated reactive intermediate. For example, l-phenyl-2-propen-l-ones can be readily transformed into 1-indanones in good yields through triflic acid-catalyzed reaction (eq 30). ... [Pg.576]


See other pages where L-Phenyl-2-propene is mentioned: [Pg.83]    [Pg.86]    [Pg.604]    [Pg.25]    [Pg.25]    [Pg.48]    [Pg.83]    [Pg.86]    [Pg.445]    [Pg.808]    [Pg.215]    [Pg.218]    [Pg.310]    [Pg.819]    [Pg.351]    [Pg.363]    [Pg.819]    [Pg.83]    [Pg.86]    [Pg.302]    [Pg.1028]    [Pg.132]    [Pg.215]    [Pg.218]    [Pg.445]    [Pg.223]    [Pg.451]    [Pg.451]    [Pg.298]    [Pg.314]   
See also in sourсe #XX -- [ Pg.257 ]

See also in sourсe #XX -- [ Pg.257 ]




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2-Propen-l-ol, 2-bromo-3-phenyl-, acetate

2-Propen-l-ol, 3-phenyl

3-Phenyl-2-propen

3-Phenyl-2-propenal

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