A highly efficient and green protocol for the synthesis of 3,3′-(arylmethylene)-bis(2-hydroxynaphthoquinone) {3,3′-(arylmethylene)-bis(2-hydroxynaphthalene-1,4-dione)} derivatives has been developed. The reaction of 2-hydroxynaphthoquinone (2-hydroxynaphthalene-1,4-dione) (2 eq.) and arylaldehydes (1 eq.) in the presence of the dicationic molten salt N , N , N ′, N ′-tetramethylethylenediaminium bis-hydrogensulfate ([TMEDAH 2 ][HSO 4 ] 2 ) under solvent-free conditions afforded the mentioned compounds in high yields and relatively short reaction times.

中文翻译：

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高效和绿色的协议，用于合成3,3'-（芳基亚甲基）-双（2-羟基萘醌）衍生物，通过特殊的熔融盐催化

合成3,3'-（芳基亚甲基）-双（2-羟基萘醌）{3,3'-（芳基亚甲基）-双（2-羟基萘-1,4-二酮）}衍生物的高效且绿色协议具有已开发。2-羟基萘醌（2-羟基萘-1,4-二酮）（2当量）与芳醛（1当量）在熔融金属盐N，N，N'，N'-四甲基乙烯二铵双-存在下的反应在无溶剂条件下，硫酸氢盐（[TMEDAH 2] [HSO 4] 2）以高收率和相对短的反应时间提供了所述化合物。