Alkylated naphthalenes

CuHu naphthalene Alkyl benzene naphthalene Benzene 208.5 99 0.03 h... 

Effect of the number of acid sites, external surface and the variation of the reaction condition for naphthalene alkylation with methanol... 

The physical properties of the two samples of H-ZSM-11 (1) and (2) and the catalytic activity for naphthalene alkylation with methanol are listed in Table 2. The surface area of the zeolites were measured by the BET method using nitrogen as the adsorbate. Calcined zeolites were used in order to obtain the total surface and uncalcined zeolite template n-Bu4N" for the external surface area, according to Sato [18]. From the data presented in the Table 2 it follows that the reaction takes place on the external surface because the naphthalene conversion was higher over H-ZSM-11(2) than over H-ZSM-ll(l). 

Selective dkylation of benzene and alkylbenzenes over various zeolites has been studied extensively since the 1960 s, as summarized in many reports [Venuto and Landis, 1968 Yashima et al., 1970 Kaeding et al., 1981 Haag, 1984 Chen and Garwood, 1986 Yashima, 1988 Dwyer, 1991 Bhat et al., 1992 Chen et al., 1996 Xu et al., 1996]. However, until recently, little attention has been paid to selective alkylation of two-ring aromatics such as naphthalene and biphenyl. Naphthalene and its derivatives are rich in liquids derived from coals via carbonization, pyrolysis and liquefaction. Due to the need for monomers for making the advanced polymer materials shown in Scheme I, (3-selective naphthalene alkylation has become an important subject. In particular, 2,6-dialkyl substituted naphthalene (2,6-DAN) is needed now for making the monomers for PEN, PBN and LCPs shown in Scheme 1. 

Figure 1. Influence of added water on naphthalene alkylation with propylene over HM38 catalyst at 200°C [Schmitz and Song, 1996].

P-13 - Naphthalene alkylation with methanol employing solid catalysts... 

Nanocrystals, anatase Nanocrystals, offretite Nanoemulsion template Nanoparticles agglomerates, MFI Nanoparticles, Au Nanoparticles, Fe203 in MCM-41 Nanoparticles, Sn02 Nanoparticles, surfactant stabilized Nanoparticles, Zr02 in SBA-15 Nanoscopic precursor particles Nanoslabs, silicalite-1 Nanowires in FSM-16 Nanowires, Se in MFI Naphtha isomerisation Naphthalene isopropylation Naphthalene alkylation 25-0-03 25-P-Naphthene ring opening S-Naproxen synthesis... 

P-l 3 - Naphthalene alkylation with methanol employing solid catalysts J. Aguilar-P, A. Corma, J.A. de los Reyes, L. Norena, G. Munoz, J.M. Sanchez,... 

Electrophilic substitution and other reactions of naphthalenes (alkylation, acylation, condensation and migration in acidic ionic liquids have been reported. Anthracene undergoes photochemical [4+4] cycloaddition reactions - in acidic chloroaluminate(III) ionic liquids. One interesting study ineluded a one-pot synthesis of anthraquinone from benzene giving a 94% yield. In general a much wider range of redox products are formed than occur in conventional solvents the strong Bronsted acidity of die ionic liquid induces protonation of anthracene, by residual traces of HCl, to form an anthracenium species which couples readily via photochemically driven electron transfer mechanisms. 

Moles of Naphthalene Alkylating Agent (moles) Catalyst (moles) Solvent Tem- perature, °C. Time, hours Products (% Yield) Reference ... 

Electrophilic substitution " and other reactions of naphthalenes (alkylation, acylation, condensation and migration in acidic ionic liquids have been reported. Anthra-... 

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