作者:Bo Liu、Henry J. Shine
DOI:10.1002/1099-1395(200102)14:2<81::aid-poc338>3.0.co;2-z
日期:2001.2
and PhS− ions. Whereas 4a gave only SN2 products, 4b gave SN2 and E2C products typical of SN2/E2C competition. Among the salts 5a–c displacement of the benzyl group was dominant (5a) or exclusive (5b, c), thus exhibiting the preferential displacement of a benzyl group that has been fully documented in earlier studies of SN2 reactions. Qualitative comparison showed that 3a (methyl) reacted much faster
一系列具有烷基 (R) 基团 Me (a)、Et (b)、isoPr (c)、2-Bu (d)、环戊基 (g) 的 5-(烷基)三氟甲磺酸噻吩 (3a-d, g-i) )、环己基 (h) 和环庚基 (i) 通过用甲酸烷基酯和三氟甲磺酸 (三氟甲磺酸) 烷基化噻蒽 (Th) 来制备。用苄基溴和三氟甲磺酸银实现苄基化 (3f)。5-(新戊基)高氯酸噻蒽 (3e) 由噻蒽阳离子自由基高氯酸盐与二新戊基汞反应制备。甲基-(4a)和三氟甲磺酸环己基二苯基锍(4b)通过二苯硫醚的烷基化制备。苄基二甲基-(5a)、二苄基甲基-(5b)和苄基甲基苯基锍高氯酸盐(5c)以标准方式制备。研究了这些锍盐与碘离子和噻吩氧离子的反应,以便与我们之前报道的可比较的 5-(烷氧基)硫蒽和甲氧基二苯基锍盐的反应进行比较。据推断,3-5 与亲核试剂 (Nu-) I- 和 PhS- 的反应遵循传统的 SN2 和 E2C 路径。因此,盐