1 3 dibromopropane

For the synthesis of surfactant and mesoporous molecular sieves, the following standard compounds were used: imidazole (Shanghai Macklin Biochemical Co., Shanghai, China, ≥99.0%), 1,3-dibromopropane (Shanghai Macklin Biochemical Co., Shanghai, China, ≥99.0%), hexadecyltrimethylammonium bromide (Shanghai Aladdin Biochemical Technology Co., Ltd., Shanghai, China ≥98.0%), bromohexadecane (Shanghai Macklin Biochemical Co., Shanghai, China, 98.0%), acrylonitrile (Shanghai Aladdin Biochemical Technology Co., Ltd., Shanghai, China, ≥99.5%), ethyl acetate (Shanghai Macklin Biochemical Co., Shanghai, China, ≥99.5%), tetraethylorthosilicate (Shanghai Aladdin Biochemical Technology Co., Ltd., Shanghai, China, 98.0%) and crystal (Shanghai Aladdin Biochemical Technology Co., Ltd., Shanghai, China, ≥90.0%), ammonia (Shanghai Macklin Biochemical Co., Shanghai, China, 25%), anhydrous ethanol (Shanghai Aladdin Biochemical Technology Co., Ltd., Shanghai, China, ≥99.5%), isopropanol (Shanghai Aladdin Biochemical Technology Co., Ltd., Shanghai, China, ≥99.5%) and methanol (Shanghai Aladdin Biochemical Technology Co., Ltd., Shanghai, China, ≥99.5%). All experimental reagents were used directly without further purification.

Chitooligosaccharide lactate (deacetylation degree of 94%, molecular weight ≤ 3000 Da) was obtained from Weikang Biomedical Technology Co., Ltd. (Linyi, China). Dimethyl sulfoxide (DMSO), acetonitrile, acetone, absolute ethanol, ethyl acetate, trimethylamine (33% ethanol solution) and triethylamine were purchased from Sinopharm Chemical Reagent Co., Ltd. (Shanghai, China). Nicotinic acid, N,N′-carbonyl diimidazole (CDI) and 1,3-dibromopropane were obtained from Macklin Biochemical Co., Ltd. (Shanghai, China). Tripropylamine and tributylamine were purchased from Aladdin Reagent Co., Ltd. (Shanghai, China). All drugs and reagents were obtained from commercial sources and used without further processing.