bromide 16b coalesced in pyridine-d5, 1,2-dichlorobenzene-d4, chlorobenzene-d5, and toluene-d8. The coalescence temperature (Tc) depended on the nucleophilicity of the counteranions as well as on the polarity of the solvents; Tc decreased as the nucleophilicity of the counteranions increased or as the polarity of the solvent decreased. Thus, the configuration at bismuth in tetrafluoroborates 14 and tosylate
研究了不对称四芳基双mut盐的合成和立体
化学行为。开发了两种合成不对称取代的四芳基双mut盐的方法(
锡和
硼法)。在
锡的方法,三芳基二
氟乙烯的连续处理(1 ;的Ar 1 3 BIF 2)与
氰化三甲基
硅烷和aryltri- Ñ -butylstannanes(2 ;卜3 SNAR 2)在
路易斯酸(BF的存在3 ·OET 2或在沸腾的
二氯甲烷中的Me 3 SiOTf)得到四芳基双bis盐(3,[Ar 1 3的Ar 2的Bi + ] [BF 4 - ],或5,[AR 1 3的Ar 2的Bi + ] [光学传递函数- ])在44-85%的产率。相反,在
硼法中,在BF 3 ·OEt 2存在下用芳基
硼酸(4; Ar 2 B(OH)2)进行类似的1处理,在室温下得到的四
氟硼酸酯3的收率为55-99%。两种方法均用于合成不对称的四芳基双mut盐(9 ; [Ar 1 Ar 2 Ar3的Ar 4的Bi + ] [BF