Investigations of Steric and Electronic Factors Influencing the Cyclopalladation ofmeta-Toluidine Analogues
作者:Waldo Mossi、Alfred J. Klaus、Paul Rys
DOI:10.1002/hlca.19920750807
日期:1992.12.16
The cyclopalladation of two different types of aniline derivatives is described: the acetylated anilines N-(3-methylphenyl)acetamide (2a), 3-(acetylamino)-4-chlorobenzoic acid (2c), and N-(2-chlorophenyl)acetamide (2d) are cyclometalated easily with palladium(II) acetate and trifluoroacetic acid to yield the corresponding complexes 4a, 4c, and 4d, respectively, whereas the acetylated meta-toluidine
描述了两种不同类型的苯胺衍生物的环钯:乙酰化的苯胺N-(3-甲基苯基)乙酰胺(2a),3-(乙酰氨基)-4-氯苯甲酸(2c)和N-(2-氯苯基)乙酰胺(2d)易于用乙酸钯(II)和三氟乙酸环化,分别得到相应的配合物4a,4c和4d,而乙酰化间甲苯胺N-(2-氯-5-甲基苯基)乙酰胺(2b))不能在乙酰氨基和甲基之间的唯一可及位置被金属化。但是,该芳香族CH键可以被第二种间甲苯胺衍生物激活:2-氯-5,N-二甲基-N-亚硝基苯胺(3b)容易经历环钯反应生成相应的Pd II复合物di-μ -三氟乙酰基-双[3-氯-6-甲基-2-(N-甲基-N-亚硝基氨基)苯基-C,N O]二钯(II)(5b),含有五元的Palladacycle与Pd配位II在亚硝基N原子上,该原子通过15 N-NMR光谱确定。