OsHCl(CO)L2 (L=PBu2tMe) is transformed to OsCl(NO)(CO)L2 by p-MeC6H4SO2N(NO)Me. Chloride removal with NaBAr4′ [Ar′=3,5-(CF3)2C6H3] yields the nonplanar, unsaturated Os(0) compound [Os(NO)(CO)L2]BAr4′, which is shown to be more reactive towards oxidative addition than its Ru analog. It adds H2, and the resulting Os(H)2(NO)(CO)L2+ shows broad coalesced hydride NMR signals at 25°C but inequivalent sites (1H NMR spectra) at -32°C. This cation is deprotonated by NEt3 to give trigonal bipyramidal OsH(NO)(CO)L2. The cation Os(NO)(CO)L2+ adds CO. Reaction of Os(NO)(CO)L2+ with PhC2H gives first a 1:1 adduct, then the oxidative addition product OsH(C2Ph)(NO)(CO)L2+, then the vinylidene complex Os(CCHPh)(NO)(CO)L2+; a mixture of these cations can be deprotonated by NEt3 to give Os(CCPh)(CO)(NO)L2. Reaction of Os(NO)(CO)L2+ with Me3SiC3CSiMe3 gives Os[CC(SiMe3)2](NO)(CO)L2+, which can be doubly hydrolyzed to give Os(CCH2)(NO)(CO)L2+. HCCH forms an η2-HCCH adduct, which does not isomerize to Os(CCH2)(CO)(NO)L2+ even at 60°C.
OsHCl(CO)
L2 (L=PBu2tMe) 通过 p-MeC6H4SO2N(NO)Me 转化为 OsCl(NO)(CO)
L2。用 NaBAr4' [Ar'=3,5-(
CF3)2C6H3] 去除
氯化物,产生非平面、不饱和 Os(0) 化合物 [Os(NO)(CO)
L2]BAr4',它对氧化反应更具反应性另外比其Ru类似物。添加 H2,生成的 Os(H)2(NO)(CO)
L2+ 在 25°C 下显示出广泛的聚结
氢化物 NMR 信号,但在 -32°C 下显示出不等价位点(1H NMR 谱)。该阳离子被 NEt3 去质子化,得到三角双锥体 OsH(NO)(CO)
L2。阳离子 Os(NO)(CO)
L2+ 加成 CO。Os(NO)(CO)
L2+ 与 PhC2H 反应首先生成 1:1 加合物,然后生成氧化加成产物 OsH(C2Ph)(NO)(CO)
L2+,然后是亚
乙烯基络合物Os(CCHPh)(NO)(CO)
L2+;这些阳离子的混合物可以被 NEt3 去质子化,得到 Os(CCPh)(CO)(NO)
L2。 Os(NO)(CO)
L2+ 与 Me3SiC3CSiMe3 反应得到 Os[CC(SiMe3)2](NO)(CO)
L2+,它可以双
重水解得到 Os(CCH2)(NO)(CO)
L2+。 HCCH 形成 η2-HCCH 加合物,即使在 60°C 下也不会异构化为 Os(CCH2)(CO)(NO)
L2+。