Cinnamic acid, a-

It is instructive for the student to construct a rough melting point diagram (compare Section 1,13 and Fig. 1,12, 1) for mixtures of cinnamic acid and urea. Weigh out 1 00 g. each of the two finely powdered components, and divide each into ten approximately equal portions on a sheet of clean, smooth paper. Mix 4 portions of cinnamic acid (A) with 1 portion of urea B) intimately with the aid of a spatula on a glass slide, and determine the melting point (the temperature at which the mixture just becomes completely fluid is noted). Repeat the procedure for 3 parts of A and 2 parts oiB 2 parts of A and 3 parts of B and 1 part of A and 4 parts of B. Tabulate your results as follows —... [Pg.230]

It contains 30 per cent, of d-camphoi, 17 per eonc. of rf-cainphene. cineol, an eater of cinnamic acid, a Htsumterpene, a high hniling phetiol, and probably limonene. [Pg.101]

Figure 6 and 7. Surface grafting of polyethylene (PE) and polypropylene (PP) films with acrylic acid (AA), methacrylic acid (MAA), crotonic acid (CA), tiglic acid (TA), 3-methylcrotonic acid (3-MCA) and a-methyl cinnamic acid (a-MCA), measured by absorption of visible light after grafting for 2 min. with vapor phase method and dipping in aqueous solution of crystal violet. [Pg.178]

Cinnamic acid, a-cyano-/3-methyl-, ethyl ester)... [Pg.25]

Use of the Knoevenagel reaction (67OR(l5)204), in which a benzaldehyde reacts with an activated methylene compound in the presence of an amine, goes some way to overcoming the inherent difficulties of the Perkin synthesis of coumarins (see later). In order to obtain the coumarin rather than the usual cinnamic acid, a 2-hydroxy substituent must be present... [Pg.803]

Figure 11.3.11 Sample UV spectra from various polyphenolics classes (A) cinnamic acid (a phenolic acid), (B) cyanidin (an anthocyanidin), (C) catechin (a flavan-3-ol), and (D) quercetin (a flavonol). AU, absorbance units.

Cinnamic acid (a) Cinnamic acid (P) Cinnamic acid (P)... [Pg.222]

Cinnamic acid, a-(/9-HYDROXYSTYRYL)-, y-LACTONE, 43, 3 Cinnamyl bromide, 44, 32 Condensation, of aldehydes and ketones with esters to give (S-hydroxy-esters, 44, 58... [Pg.111]

Bulletin of the Chemical Society of Japan Figure 8c. Polarized absorption spectrum of trans-cinnamic acid a-form through the (010) plane. —the... [Pg.461]

General Considerations. Cinnamic acid solid state photodimerizations are the prototype for the topochemical postulate and reasoning [7], The a-modification of frans-cinnamic acid a-4 gives a-truxillic acid 5 (head-to-tail), while the /i-modification (/J-4) gives /i-truxinic acid 6 predominantly... [Pg.127]

Cinnamic acid, a metabolite of phenylalanine, has been linked with tropic acid biosynthesis via its epoxide (38) on chemical grounds, but neither of these compounds was found to act as a tropic acid precursor. That rearrangement was not taking place after linking cinnamic acid to a tropine residue was demonstrated when it was found that cinnamoyltropine (40 labels as shown) was incorporated into (33) with retention only of the tropine label, which is consistent with hydrolysis of (40) to tropine (39) and cinnamic acid in the plant, the latter not being incorporated. Moreover, whilst littorine (35 and labels as shown) was incorporated... [Pg.10]

Big Chemical Encyclopedia

Chemical substances, components, reactions, process design ...