Bis- and tris(amidine)fluoroboron cations and mixed tetrahaloborate anions: NMR studies of mixed boron trihalide adduct redistribution reactions involving amidines as strong nitrogen bases
作者:J. Stephen Hartman、Zheng Yuan、Arnold Fox、Anh Nguyen
DOI:10.1139/v96-242
日期:1996.11.1
amidine–mixed boron trihalide adduct systems D•BFnCl3−n (n = 0–3) in the presence of excess boron trihalide to give complex mixtures of products including the mixed tetrahaloborate anions BFnCl4−n− and the fluoroboron cations D2BF2+ and D3BF2+, which coexist with the neutral adducts D•BFnCl3−n. Excess amidine rapidly displaces chloride ion from the chlorofluoroborate anions and neutral mixed boron trihalide
在过量三卤化硼存在下,脒作为强路易斯碱与脒混合三卤化硼加合物系统 D•BFnCl3−n (n = 0–3) 反应,得到复杂的产物混合物,包括混合四卤硼酸阴离子 BFnCl4−n− 和氟硼阳离子 D2BF2+ 和 D3BF2+,它们与中性加合物 D•BFnCl3−n 共存。过量的脒会迅速从氯氟硼酸盐阴离子和中性混合三卤化硼加合物中置换氯离子,从而获得高产率的氟硼阳离子。脒 1,8-二氮杂双环 [5,4,0]undec-7-ene (DBU) 和 1,5-二氮杂双环 [4,3,0]non-5-ene (DBN) 的 D3BF2+ 阳离子是惰性的且已被分离为它们的六氟磷酸盐。(DBN)2BF2+ 是惰性的,并以其六氟磷酸盐的形式被分离出来,但 (DBU)2BF2+ 具有高反应性。关键词: 脒, 氟硼阳离子,