Unusual Stabilities and Reactivities of Tris- and Bis(2,4,6-trimethoxyphenyl)carbenium Salts
作者:Masanori Wada、Hideki Konishi、Katsuhiko Kirishima、Hiroshi Takeuchi、Satoko Natsume、Tatsuo Erabi
DOI:10.1246/bcsj.70.2737
日期:1997.11
2,4,6-Trimethoxyphenyllithium, Φ′Li[Φ′ = 2,4,6-(MeO)3C6H2], reacted with diphenyl carbonate and with ethyl formate to give tris(2,4,6-trimethoxyphenyl)methanol, Φ′3COH (1), and bis(2,4,6-trimethoxyphenyl)methanol, Φ′2CHOH (2), respectively. Compound 1 reacted with a slight excess of perchloric acid in 2-propanol to give very dark-purple crystals of the triarylcarbenium salt, [Φ′3C]X (3, X = ClO4),
2,4,6-三甲氧基苯基锂,Φ'Li[Φ' = 2,4,6-(MeO)3C6H2],与碳酸二苯酯和甲酸乙酯反应生成三(2,4,6-三甲氧基苯基)甲醇,Φ '3COH (1) 和双 (2,4,6-三甲氧基苯基) 甲醇,分别为 Φ'2CHOH (2)。化合物 1 与略过量的高氯酸在 2-丙醇中反应,得到非常深紫色的三芳基碳鎓盐晶体,[Φ'3C]X (3, X = ClO4),即使在热乙醇中也是惰性的。然而,在 1 M (1 M = 1 mol dm-3) 盐酸中原位制备的 3 (X = Cl) 用 1 M 氢氧化钠处理得到 4-双(2,4,6-三甲氧基苯基) )亚甲基-3,5-二甲氧基-2,5-环己二烯酮。化合物 2 还在甲醇中与稍过量的高氯酸反应,得到二芳基碳鎓盐的深红色晶体,[Φ'2CH]X (5, X = ClO4)。即使在热甲醇中,化合物 5 也相当惰性,但在伯醇和仲醇中很容易被还原,得到双(2