名称:
Mercuriation of 3,4,5-trimethoxybenzoic acid. Synthesis of derivatives of the mercuriation product and crystal and molecular structure of PPh3(CH2Ph)][HgCl{C6H(CO2)-6-(OMe)3-2,3,4}]
摘要:
The mercuriation of 3,4,5-trimethoxybenzoic acid has been re-investigated and the product [HgCl{C6H(CO2H)-6-(OMe)3-2,3,4)] (1) characterized. It is deprotonated by Na2CO3 to give [Hg(C6H(CO2)-6-(OMe)3-2,3,4)]n (2) which, in turn, reacts with benzyltriphenylphosphonium chloride or triphenylphosphine to give [PPh3(CH2Ph)][HgCl{C6H(CO2)-6-(OMe)3-2,3,4)] (3) or [Hg{C6H(CO2)-6-(OMe)3-2,3,4)(PPh3)] (4), respectively. The reaction of 2 with Mel in the presence of [NMe4]Cl affords [Hg(C6H(CO2Me)-6-(OMe)3-2,3,4}2] (5), which reacts with HgCl2 or HgI2 to give [HgX{C6H(CO2Me)-6-(OMe)3-2,3,4}] [X = Cl (6), I (7)]. The crystal structure of 3 shows a linear geometry at the mercury atom [Cl-Hg-C 178.0(2)-degrees, Hg-Cl 2.315(2), Hg-C 2.060(5) angstrom], with an additional long Hg ... O contact [2.573(4) angstrom].