Naphtyl group

Chromophores With a Flexible Link. Bichromophores containing at one side a naphtyl group and at the other side a series of chromophores, linked by a polymethylene chain [10] have been studied by means of emission spectroscopy. 

The substitution of alkyle or naphtyle groups, either on the benzene ring or on the nitrogen atom, allows for another colour succession [32,33] for instance, poly N-naphthylaniline leads, with increasing potential, to the succession of yellow, red, purple and dark blue colours. 

In a modified version of the Suzuki reaction arylboronates or boranes are utilized instead of arylboronic acid. Under the action of phosphine-free palladium catalysts NaBPh4 and tra(l-naphtyl)borane were found suitable phenyl-sources for arylation of haloaromatics in fully or partially aqueous solutions at 20-80 °C with good to excellent yields (Scheme 6.12) [32-34]. Aryl halides can be replaced by water-soluble diaryliodonium salts, At2IX (X = HSO4, BF4, CF3COO) in the presence of a base both Ar groups take part in the coupling [35]. 

In the catalytic system shown in Scheme 3.9, a hydrogen bond between one hydroxy function of the diol catalyst and the carbonyl group of the substrate is regarded as the driving force of catalysis. Here, the spahal orientahon of the bulky a-l-naphtyl substituents of the TADDOL (a,a,a, a -tetraaryl-l,3-dioxolan-4,5-dimethanol) scaffold generates the chiral environment controlling the enanti-oselectivity of the reaction. 

Le Barbu et al. [114] have studied the chiral discrimination between 2-naphtyl-1-ethanol and propanol, 2-methyl-1-butanol, 2-butanol, and 2-pentanol by gas-phase fluorescence experiments in helium supersonic expansion, using laser controlled excitation. As the model compound chosen, 2-naphthyl-1-ethanol, has both a hydroxyl and a naphthyl group, a balance between HB and dispersive-repulsive forces with the solvent molecule can be attained. As a support, ab initio calculations at the MP2/6-31G have been carried out. After studying the complex... 

The [4 + 2] photooxygenation of dienes and benzene rings leads to endo oxides. With chiral naphtyl alcohols 191,192, and 193 were formed with a dias reomeric excess up to 90%, when the reaction was carried out at — 30°C in CD (Scheme 50). In order to explain the selectivity in aprotic solvents, it was propo that an intramolecular hydrogen bond can be developed between the hydrox group and 102 during the approach of the dienophile from one or the other si of the naphthalene ring, favoring one of the two diastereoisomeric transit states. 

Phenyl-naphtylamine (PAN) is contained in some rubbers and oils as an antioxidant of the amine group. It is closely related to the phenyl-beta-naphtylamine (PBN) and the di-beta-naphtyl-p-phenylenediamine (DBNPD) but without cross reactivity. Present in aircraft grease or in fire-resistant greases, PAN caused contact dermatitis in workers at a manufacturers of rollers for conveyor belts. 

R = aryl, naphtyl, alkyl, tienyl or alkenyl group R = alkyl or aryl group R = alkyl or carbonyl group (79-93% yield 45 examples)... 

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