Two-step regioselective synthesis of 1,2-difluorobenzenes from chlorotrifluoroethylene and buta-l,3-dienes
作者:N. V. Volchkov、M. B. Lipkind、O. M. Nefedov
DOI:10.1007/s11172-020-2724-8
日期:2020.1
The gas-phase copyrolysis of chlorotrifluoroethylene with buta-1,3-diene, penta-1,3-diene, or isoprene in a flow reactor at 440–480°C gave 4-chloro-4,5,5-trifluorocyclohex-1-enes. The latter treated with aqueous KOH under condition of phase-transfer catalysis were selectively converted into 1,2-difluorobenzene, 2,3-difluorotoluene, or 3,4-difluorotoluene.
三氟氯乙烯与丁-1,3-二烯、戊-1,3-二烯或异戊二烯在流动反应器中于 440–480°C 的气相共解得到 4-氯-4,5,5-三氟环己-1 -enes。后者在相转移催化条件下用 KOH 水溶液选择性地转化为 1,2-二氟苯、2,3-二氟甲苯或 3,4-二氟甲苯。