Groups 9-anthryl

In conjunction with their Friedel-Crafts alkylation, Terada et al. found phosphoric acid (R)-3m (2 mol%, R = 9-anthryl) bearing a bulky 9-anthryl group to mediate the asymmetric Friedel-Crafts-type reaction of a-diazoester 22a with iV-acylated aldimines 26 (Scheme 10). a-Diazo-P-amino esters 27 were obtained in moderate yields (62-89%) and very good enantioselectivities (91-97% ee) [20],... 

The chemically induced asymmetric photocyclization of the l-(—)-menthyl ester shows a striking temperature dependence 76), a completely reversed ratio is obtained at low temperature. When the chiral group is placed at C(ll) of the benzo[c]phen-anthryl group (77) the effect is of the same order (about 5 % diastereomeric excess) as when the same group is placed at the paraposition of the phenyl group, or when... 

Photoirradiation of a tetrahydrofuran (THF) solution of calix[4]arene 386 having two anthryl groups produces 387 (Scheme 101). Encapsulation of alkali metal ions into the ionophoric cavities of 386-387 was investigated by Shinkai and co-workers [358], Compound 386 itself showed the poor ion affinity and the poor ion selectivity, whereas 387 showed the much improved ion affinity and the sharp Na+ selectivity. 

Table 14 Products of the Irradiation of Fullerene Derivatives 165-167 Substituted by an Anthryl Group...

Scheme 5. A zinc(II) receptor with an anthryl group...

In using the halogenated organic group, an alternative is to form the lithiated compound, followed by silylation with chlorotrialkoxysilane. This was used in particular for the 1,1" terphenyl precursor 42, or the precursor with 9,10-anthryl group 43. The expected compounds are obtained in good yields (equation 6)92. 

Table 5. Diacetylene monomers forming mixed crystals A anthryl group, Cz carbazolyl group...

Secondly, it has been proposed that the anthryl groups act as traps for the excited states which are formed in the first stage of photopolymerization so that most of the energy is emitted as fluorescence before it is transferred to the triple bond system. 

If these mixed crystals are irradiated, however, at 400 nm where only the anthryl groups absorb a small photosensitation can be observed. Neither of the two models have been fully established experimentally to date. 

Methods based on reactions involvit macromolecules and reagents containing anthryl groups. 

This method can be successfully used for polymers of the methacrylic series (the macroradicals of which do not react Iwmolytically with the anthryl group). It can also be applied to introduce LM into the chains of such polymers as polystyrene. However, in this case the copolymerization can be complicated by homolytic reactions between the growing macroradicals and the anthracene groups (see Scheme 1). Presumably, it is possible to avoid side reactions by low-temperature cationic poly-merization ... 

Dithienothiophenes give cation polymeric radicals capable of further copolymer addition" while polystryene with a narrow polydispersity has been prepared through the use of an end-capped photoactive anthryl group. ° Large differences in radical termination rates have been found to be responsible for the marked variations in molecular weights of polymer from the UV flash polymerisation of 1,3-butadiene. tra 5-l,2-bis(5-Phenyl-2-oxazolyl)ethene has been found to exhibit low laser conversion efficiency due to preferential dimerisation while thermally activated patterns can be formed on the surface of poly(methyl methacrylate) by coating with photodimerisable 9-anthraldehyde. " ... 

C. Energy Transfer to Solubilized and Covalently Bound Anthryl Groups Steady State Results... 

We have previously reported energy trapping by anthryl groups covalently bound to P(2VN-alt-MA) in THF solutions. The quantum efficiency of energy trapping Is given by x X Is obtained from the expression... 

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