Syntheses of “Phosphine-Free” Molybdenum Oxo Alkylidene Complexes through Addition of Water to Alkylidyne Complexes
作者:Feng Zhai、Richard R. Schrock、Amir H. Hoveyda、Peter Müller
DOI:10.1021/acs.organomet.0c00275
日期:2020.7.13
5 equiv), Mo(CR)(ORF9)3 (R = Arp, mesityl, or t-Bu) reacts with 1 equiv of water to yield Mo(O)(CHR)(ORF9)2(TMEDA) complexes, from which (when R = t-Bu) TMEDA is readily displaced by 2,2′-bipyridyl to give Mo(O)(CH-t-Bu)(ORF9)2(bipy). Mo(O)(CH-t-Bu)(ORF9)2(bipy) was converted into Mo(O)(CH-t-Bu)Cl2(bipy) readily, from which Mo(O)(CH-t-Bu)Cl(OHMT)(3-Brpy) (3-Brpy = 3-bromopyridine) and Mo(O)(CH-t-Bu)Cl(OHIPT)(3-Brpy)
在THF中在5%NEt 3(vs Mo)存在下,向Mo(CAr p)(OR F9)3(Ar p =对甲氧基苯基; OR F9 = OC(CF 3)3)中添加1当量水以良好的产率形成Mo(O)(CHAr p)(OR F9)2(THF)2。Mo(O)(CHAr p)(OR F9)2(THF)2与2当量的LiOHMT反应(OHMT = O -2,6-甲磺酸2 C 6 H 3)在室温下生成Mo(O)(CHAr p)(OHMT)2和2当量的NaOTPP(OTPP = 2,3,5,6-四苯酚)生成Mo(O)(CHAr p)(OTPP)2。在TMEDA(2.5当量)存在的情况下,Mo(CR)(OR F9)3(R = Ar p,1,3,4-叔丁基)与1当量的水反应生成Mo(O)(CHR)(OR F9)2(TMEDA)配合物,从中(当R = t -Bu时)TMEDA容易被2,2'-联吡啶取代,得到Mo(O)(CH-