(R3Ge)(CH3)2B3N3(CH3)3, (R3Ge)2(CH3)B3N3(CH3)3 and (R3Ge)3B3N3(CH3)3 (with R = H and C6H5). The infrared spectra show that the (C6H5)3Ge and GeH3 groups at the boron atoms diminish the dπ-pπ bonding between the boron and nitrogen atoms in the borazine ring compared with H or CH3. The dπpπ bonding decreases in the following series of B-substituents: H ~ CH3 > GeH3 > Cl ⪢ (C6H5)3Ge ⪢ (C6H5)3Si.
B-
氯-B,N-甲基
硼嗪Cl n(CH 3)3- n B 3 N 3(CH 3)3与三苯基
锗烷基
钾(C 6 H 5)3 GeK或胚芽
钾GeH 3 K反应,得到相应的(三苯基
锗烷基)-和胚芽
硼嗪(R 3 Ge)(CH 3)2 B 3 N 3(CH 3)3,(R 3 Ge)2(CH 3)B 3N 3(CH 3)3和(R 3 Ge)3 B 3 N 3(CH 3)3(R = H和C 6 H 5)。红外光谱表明,(C 6 H ^ 5)3 Ge和GeH的3组在
硼原子削弱d π - p π在环
硼氮烷环中的
硼和氮原子之间的键合与H或CH相比3。所述d π p π在以下一系列的B-取代基中,键合作用降低:H〜CH 3 > GeH 3 > Cl⪢(C 6 H 5)3 Ge⪢(C 6 H 5)3 Si。