Cinnamoyl group

The initial anhydride concentration was about 3 x 10 M, and the amine concentration was much larger than this. The reaction was followed spectrophoto-metrically, and good first-order kinetics were observed hence, the reaction is first-order with respect to cinnamic anhydride. It was not convenient analytically to use the isolation technique to determine the order with respect to allylamine, because it is easier to observe the cinnamoyl group spectrophotometrically than to follow the loss of amine. Therefore, the preceding experiment was repeated at several amine concentrations, and from the first-order plots the pseudo-first-order rate constants were determined. These data are shown in Table 2-1. Letting A represent... 

Sml2, THE or DMPU, it, 76-94% yield. Deprotection of the pyridinesul-fonamide in the presence of a cinnamoyl group was possible when done without a proton source. BOC, A-benzyl, A-allyl, and trifluoroacetamido groups were all stable to these conditions. ... 

If they are viewed as Pprodine analogues (see HI and LIll), an aromatic function at position 8 would be expected to enhance activity an 8-cinnamoyl group is detrimental in (LIll, R = Me) [146] but data on smaller aryl groups such as benzoyl has not been reported. 

Fig. 24. Photodimerization of cinnamoyl group bearing polymer pendant crown-ethers...

A series of similar polymers (V) has been prepared directly from monomers by cationic polymerization of the vinyl ether group of the monomer, the cinnamoyl group being unreactive under these conditions ( ). 

Photocross I inking of poly(vinyl-p-azidocinnamate) (XIII) is reported to involve competitive photodimerization of cinnamoyl groups to cyclobutenes along with the dominant nitrene reactions of insertion and radical abstraction. The reaction can be triplet-sensitized (19). 

The photodimerization reaetion concept was thus adapted hy Mink and co-workers in the design of a poly(vinyl cinnamate) resist system. Cross-links are formed hy photoaddition between an excited ( ) cinnamoyl group of one chain with a ground state cinnamoyl group belonging to another chain (Scheme 6.3). ... 

The imaging performance of poly(vinyl cinnamate) when exposed by a medium-pressure mercury arc lamp is poor. This is due to the mismatch between the absorption spectrum of the cinnamoyl group (with absorbance maximum at 280 nm) and the spectral emission of the mercury arc. The absorption spectrum of poly(vinyl cinnamate) does not overlap with most of the strong emission lines of a mercury arc lamp. This problem can be overcome by spectral sensitization, for example, with the addition of 5% of Michler s ketone, or by the replacement of the cinnamoyl group with a chromophore such as in poly(vinyl cinnamylidene acetate) (IV) that absorbs at longer wavelengths. ... 

C25H29O2N3 both possess cinnamoyl and another aromatic nucleus, a secondary amine function, two amide functions one of which is linked to the cinnamoyl group, and a double bond they may be isomeric with respect to the position of the double bond Root extract 101... 

---