作者:Paul McQuade、Rudolph E.K Winter、Lawrence Barton
DOI:10.1016/j.jorganchem.2003.08.035
日期:2003.12
B(3) position and the distal end of the pendent bidentate phosphine donor is uncoordinated. In the other (5a), [2,2-(PPh3)2(CO)-nido-2-OsB4H7-η2-3,2-(BH2·dppe)] (or 5b –BH2·dppp) the uncoordinated phosphine present in 4a (or 4b) has replaced a PPh3 group on the osmium center. In an effort to avoid intramolecular substitution, bidentate phosphines of the type PPh2XPPh2 X=1,4-C6H4, (arphos), 1,4-CH2C6H4CH2
在六硼烷-(PPh 3)2(CO)OsB 5 H 9(1)与二齿膦的反应中,[1,2-(PPh 2)2(CH 2)2 ]和[1,3- (PPh 2)2(CH 2)3 ](分别缩写为dppe和dppp),在每种情况下均观察到两种产物。主要产物(4a),[2,2,2-(PPh 3)2(CO)-氨基-2-OsB 4 H 7 -3-(BH 2·(dppe)](或4b –BH 2 ·dppp)是一个osmapentaborane簇,其BH 2 ·dppp基团在基团B(3)位置连接到笼子,而侧链双齿膦供体的末端未配位。在另一个(图5a),[2,2-(PPH 3)2(CO) -巢-2- OSB 4 ħ 7 -η 2 -3,2-(BH 2 ·DPPE)](或5B -BH 2 ·dppp)4a(或4b)中存在的未配位膦已替代PPh 3组在os中心。为了避免分子内取代,PPh 2 XPPh 2 X = 1,4-C