Synthesis and Reactivity of [(silox)<sub>2</sub>MoNR]<sub>2</sub>Hg (R = <sup>t</sup>Bu, <sup>t</sup>Amyl; silox = OSi<sup>t</sup>Bu<sub>3</sub>): Unusual Thermal Stability and Ready Nucleophilic Cleavage Rationalized by Electronic Factors
作者:Devon C. Rosenfeld、Peter T. Wolczanski、Khaldoon A. Barakat、Corneliu Buda、Thomas R. Cundari、Frank C. Schroeder、Emil B. Lobkovsky
DOI:10.1021/ic7010953
日期:2007.11.1
strong (L=PMe, pyridine, S8) or weak (L=2-butyne, ethylene, N2O, 1,4,7,10-tetrathiacyclododecane, 1,4,7,10,13,16-hexathiacyclooctadecane) nucleophiles, an enhanced rate of Mo-Hg bond cleavage was noted, with some of the former group generating adducts in <5 min; the products were 6-tBu, 7-py, (silox)2(S)Mo=NtBu (10-tBu), (silox)2Mo=NtBu(C2Me2) (8-tBu), (silox)2(C2H4)Mo=NtBu (11-tBu), (silox)2(O)Mo=NtBu
(DME)Cl2Mo(= NR)2(R = tBu,(1-tBu),tAmyl(1-tAmyl))用2当量的tBu3SiOH(siloxH)和1当量的HCl处理产生的(silox)2Cl2Mo = NR( R = tBu,(3-tBu),t-戊基(3-tAmyl));随后用Na / Hg还原得到Mo(V)氯化物(silox)2ClMo = NtBu(4-tBu)和Mo(IV)汞衍生物[[silox)2Mo = NR] 2Hg(R = tBu(( 5-tBu)2 Hg),tAmyl((5-tAmyl)2 Hg))。在L(L = PMe3,吡啶,4-甲基吡啶)存在下还原3-tBu和3-tAmyyl导致分离出加合物(silox)2(Me3P)Mo = NR(R = tBu(6-tBu) ,tAmyl(6-tAmyl))和(silox)2L2Mo = NtBu(L = py(7-py),4-pic