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Frans-2-Butenoic acid

Exercise 9-5 The microwave spectrum of pure frans-2-butenoic acid (CH3CH= CHC02H) shows patterns exactly like those of Figure 9-8, which indicate the presence of two different conformations. What are these conformations, and why are there only two of them (You may be helped by reviewing Section 6-5.)... [Pg.271]

The highest diastereoselectivity of asynunetric methoxyselenenylation of alkenes was achieved using the ferrocenylselenium triflates in excellent chemical yields [5 g]. For example, the stoichiometric reaction of the chiral ferrocenylselenium triflate 41, prepared from the chiral diferrocenyl diselenide 2, with frans- -methylstyrene afforded the corresponding methoxyselenenylated product in high chemical yield with excellent diastereoselectivity (up to 98% de). Fukuzawa and co-workers employed the diferrocenyl diselenide 2 for the catalytic asymmetric oxidation of, y-unsaturated esters and frans- -methylstyrene to the corresponding optically active allylic methyl ethers with moderate enantio-selectivity (Scheme 24) [27]. The allylic ethers were produced from 4-phenyl-3-butenoic acid esters in 70-78% yield with 17-22% ee. [Pg.251]

A soln. of bromine in methylene chloride added dropwise to a vigorously stirred soln. of 2-methyl-3-butenoic acid in the same solvent, which is removed in vacuo at room temp, when the bromine color has almost completely disappeared, the crude intermediate dissolved in chloroform, and added slowly to a soln. of triethylamine in the same solvent a-methylbutenolide. Y 75%. F. e. s. M. Fran de-Neumann and C. Berger, Bl. 1968, 4067. [Pg.73]

BUTENOIC AOD, L-frans-2-AMINO-4-(2-AMINOETHOXY).3-[See L-(rans-2-ainino-4-(2-aiiiinoethoxy)-3-butenoic acid]... [Pg.72]

C HeOi) Cjs-crotonic, frans-crotonic 3-butenoic, methacrylic and cyclopropane carboxylic acids 210 g, n 425... [Pg.191]


See other pages where Frans-2-Butenoic acid is mentioned: [Pg.416]    [Pg.222]    [Pg.903]    [Pg.852]    [Pg.900]    [Pg.1243]    [Pg.1542]    [Pg.416]    [Pg.222]    [Pg.903]    [Pg.205]    [Pg.852]    [Pg.900]    [Pg.35]   
See also in sourсe #XX -- [ Pg.670 ]




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