Anilino groups

A wide range of 2,4,6-trisubstituted pyrimidines were quatemized by Curd et al. during the Antricyde project, and the results are given in Table III, Apart from the possible steric effect of the anilino group,... 

Matsui et al. and Goi have extensively studied substituent effects in the aromatic ring of anilino groups attached to nuclear... 

In fluoran 50, the methyl group at 3 -position causes steric hindrance to the adjacent anilino group resulting in torsion of the anilino group from the xanthene plane. Consequently, electron transfer from the anilino group to the xanthene moiety is hindered more or less, resulting in hypsochromic shift of the absorption at 610 nm to 570 nm (violet in color). On the other... 

Introduction of a methyl group on the anilino group at 2 -position has more than a little influence on color tone. For example, 6 -diethylamino-2 -(2,4-dimethylanilino)-3 -methylfluoran (55)54 and 6 -diethylamino-2 -(2,6-dimethylanilino)-3 -methylfluoran (56)ss develop greenish black and reddish black colors, respectively. 

Alkylamino groups are also employed in place of anilino groups at 2 -position to give black color, though the color tone is a little greenish. These include 6 -diethylamino-3 -methyl-2 -n-octylaminofluoran (60),61 and 3 -chloro-6 -diethylamino-2 -(2-ethoxyethylamino)fluoran (61).62... 

The disulphonated DAST derivative 11.25 containing four anilino groups per molecule is effective in liquid detergent formulations and much cheaper to manufacture than the monosulphonated DAST brightener 11.67, which was withdrawn from the market in the late 1980s. It has been necessary to purify compound 11.25 specially for use in detergents, in order to eliminate traces of residual unreacted aniline as far as possible, owing to the toxic properties of this impurity. 

Hector s bases571 thus leaves a choice between 35 and 36 for the structure of the latter. The decision in favor of 35 is based on the assumption that a free amino group rather than the anilino group is likely to be involved in the ring closure (28->35) it is supported by the fact that the chemical properties of Hector s bases are accounted for better in terms of structure 35 than 36 (see below). 

As already discussed in Section II, larger systems like the diphenylsul-fones also exhibit a charge-transfer fluorescence, and the donor can be shown not to be the amino but the entire anilino group. In the case of the anilino-substituted anthracene ADMA this has directly been demonstrated by the bridged model compound ADMAB. 

For 9-phenylamino-6,7,8,9-tetrahydro-4//-pyrido[l,2-a]pyrimidin-4-ones 32 (R = NHPh R1 = H R2 = H, COOH) the half-chair conformation with a pseudoaxial 9-phenylamino group was the predominant one. But with the 6-methyl-9-phenylamino derivatives 32 (R = NHPh, R1 = Me) the cis-trans ratio was near 1 1 in the imine form. The presence of a methyl group on the nitrogen atom of the 9-anilino group 32 (R = NMePh) increased the amount of the cis form which contained the 9-substituent in a pseudoequatorial position [85JCS(P1)1015]. The 6-methyl group was in a pseudoaxial position in all tautomers. 

Condensation of (441) [306, 307] with 1,2-di-O-stearoyl-DL-glycerol 3-phosphate in the presence of 2,4,6-triisopropylbenzene sulfonyl chloride in pyridine gave a mixture of the required products (442) (52%) and the isomer (443) (26%) which were separated by chromatography. The anilino groups were removed from (442) by the... 

The amine function in Pcs was also found to be versatile as it allows for the facile incorporation of other photoactive or electroactive species. In particular such amino-functionalized Pcs can be easily reacted with perylene dianhydride to undergo formation of the corresponding diimides such as 18 (Fig. 13) [90-92], The Pc building blocks, carrying either a spacered amino or an anilino group, respectively, were thus implemented into the perylene structure by melting of the two components in imidazole to result in the construction of the corresponding multicomponent assemblies. The pathway toward such structures can also be performed by first introduction of the phthalonitrile to the perylene followed by the formation of the macrocycle [93],... 

Replacement, chlorine, in an imido-chloride group by an anilino group,... 

Nickel complexes of type d have been studied by Sacconi (82-84,91) and similar compounds by Holm (16). If NR2 is an or /io-substituted anilino group, the complexes are planar and diamagnetic. If NR2 is anilino or para-substituted anilino, the substances are octahedral or planar, depending on X. In inert solvents, compounds with a substituted anilino group exist as an equilibrium mixture of octahedral and planar forms, with the planar form predominating at higher temperatures (83). If the NR2... 

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