Methanol, acetonitrile, acetone, isopropanol, and dimethyl sulfoxide (DMSO), toluene, diethyl ether, and potassium hydroxide were of analytical grade and purchased from Energy Chemical Co., Ltd. (Shanghai, China). The above agents were used without further distillation. Dichloroacetic acid (CAS no. 79-43-6), 1-bromododecane (CAS no. 143-15-7), 1-bromotetradecane (CAS no. 112-71-0), 1-bromohexadecane (CAS no. 112-82-3) and hydroxylalkylamines were purchased from Energy Chemicals (Shanghai, China). Glyphosate isopropylamine salt (purity 62%, aqueous solution) was obtained from Lier Chemical Co., Ltd (Sichuan, China). N-Alkyl-N,N-2-dihydroxyethyl-N-methylammonium bromide (CnDHAB, n = 12, 14 and 16) were synthesized according to reported procedures described in the literature.45 Methyl sulfoxide-d6 with a deuteration degree of 99.8% for NMR spectra was obtained from J & K Scientific Co., Ltd. (Beijing, China).
The 1H, 13C NMR spectra were recorded with a Bruker 400 spectrometer (Bruker, Germany) at 400 and 100 MHz, respectively. Chemical shifts (δ) are reported relative to the residual solvent resonances of methyl sulfoxide-d6.
The 1H, 13C NMR spectra were recorded with a Bruker 400 spectrometer (Bruker, Germany) at 400 and 100 MHz, respectively. Chemical shifts (δ) are reported relative to the residual solvent resonances of methyl sulfoxide-d6.