Chirale tripodliganden: Die eintopfreaktion MeC(CH2PPh2)3 → MeC(CH2P(Ph)(R))3; Zwischenstufen, diastereoselektive kontrolle und komplexchemie
作者:Olaf Walter、Thomas Klein、Gottfried Huttner、Laszlo Zsolnai
DOI:10.1016/0022-328x(93)80458-n
日期:1993.10
The tripod ligand H3CC(CH2PPh2)3, 1, reacts with lithium metal to produce H3CC(CH2PPhLi)3, 2, in good yields. Compound 2 crystallizes in the form of 2·4THF·MeN(CH2CH2NMe2)2. The crystal structure of this adduct shows bridging as well as terminal phosphorous-coordination of lithium. Compound 2 reacts with electrophiles RX to give H3CC(CH2 P(Ph)(R))3, 3 (R = H, Me, Et, iPr, CH2Ph, 3a–3e). The transformation
三脚架配位体H 3 CC(CH 2 PPH 2)3,1,与锂金属反应生成H 3 CC(CH 2 PPhLi)3,2,以良好产率。化合物2个结晶形式的2 · 4 THF·男性(CH 2 CH 2 NME 2)2。该加合物的晶体结构显示出桥连以及锂的末端磷配位。化合物2与亲电试剂RX反应生成H 3 CC(CH 2 P(Ph)(R))3,3(R = H,ME等,我PR,CH 2 PH,3A-3E)。转化1 → 2 → 3可以在一锅反应中进行。尽管手性化合物3可以如此表征,但它们与(CH 3 CN)3 Mo(CO)3的反应产生易于表征的配位化合物H 3 CC(CH 2 P(Ph)(R))3 Mo (CO)3,5。的NMR分析3只5示出了从两个非对映体形式3(对映体对SSR / RRS和对SSS / RRR)仅以R = CH 2 Ph(3e,5e)形成SSR / RRS-非对映异构体。在其他情况下(R