Research Progress on the Synthesis of 2,6-Dimethynaphthalene by Alkylation of Methylnaphthalene
Poly(ethylene naphthalate)(PEN)shows excellent application potentials as an emerging high-performance polyester material.However,the development of PEN is hindered due to the high cost of 2,6-dimethynaphthalene(2,6-DMN)precursor.Therefore,it is of great significance to develop a low-cost synthesis route of 2,6-DMN.In comparison of various 2,6-DMN synthesis methods,alkylation of methylnaphthalene is founded to be more desirable due to its short and economical synthesis route.The paper reviews recent advances in 2,6-DMN synthesis via alkylation of methylnaphthalene,and introduces the alkylation mechanism and characteristics.Alkylation of methylnaphthalene is a shape-selective reaction catalyzed by Brønsted acid,which is also controlled by diffusion of methylnaphthalene and products such as 2,6-DMN.Therefore,reaction activity,selectivity and stability are enhanced using molecular sieves with weaker acid sites and pore sizes within 0.6 nm.Based on this,the methods of tuning the acidity and pore structures are evaluated,which provide strategies for designing high catalytic-performance molecular sieves for the alkylation of methylnaphthalene.
NETL
NSTL
万方数据
