Hydroboration of Ï-donor substituted alkynes DâCCâH [D = Ph2P, 4-XâC6H4-(X = H, MeS, MeO, H2N), and (η5-C5H5)Fe(η5-C5H4-)] with dimesitylborane [(mes)2BH]2, mes = 2,4,6-Me3C6H2} yields air-stable âpushâpullâE-alkenes of the form E-DâCHCHâB(mes)2, which possess large molecular hyperpolarizabilities, β, as shown by electric-field induced second-harmonic generation (EFISH) experiments at 1.91 µm; single crystal X-ray diffraction studies indicate that E-PhâCHCHâB(mes)2 and E-4-MeOâC6H4âCHCHâB(mes)2 crystallise in centrosymmetric space groups, whereas E-Ph2PâCHCHâB(mes)2 crystallises in the acentric space group P212121 and exhibits powder SHG of 1.064 µm laser light.
D = Ph2P、4-Xâ
C6H4-(X = H、MeS、MeO、
H2N)和 (Î-5-
C5H5)Fe(Î-5-
C5H4-)] 与二甲基
硼烷 [(mes)2BH]2, mes = 2,4、6-Me3C6H2}产生 E-DâCHCHâB(mes)2形式的空气稳定的âpushâpullâE-烯,这种烯具有很大的分子超极化能力δ²,正如电场诱导二次谐波发生(EFISH)实验在 1.91 µm;单晶 X 射线衍射研究表明,E-PhâCHCHâB(mes)2 和 E-4-MeOâ âCHCHâB(mes)2 在中心对称空间群中结晶,而 E-Ph2PâCHCHâB(mes)2 则在中心空间群 P212121 中结晶,并在 1.064 µm 激光下显示粉末 S
HG。