Stereo and regioselectivity in the phenylation of cationic allylpalladium(II) α-diimine complexes by tetraphenylborate anion
作者:Bruno Crociani、Simonetta Antonaroli、Francesca Di Bianca、Alberta Fontana
DOI:10.1016/0022-328x(93)80131-t
日期:1993.5
The reaction of the cationic complex [Pd(4-methoxy-1,3-η3-cyclohexenyl)(py-2-CHNC6H4OMe-4)]+ (1) with BPh4− in the presence of fumaronitrile yields trans-3-methoxy-6-phenylcyclohexene (2a) and trans-4-methoxy-3-phenylcyclohexene (2b), in ca. 1 : 1 molar ratio. The trans stereochemistry of these products implies that the phenylation of the allyl ligand involves prior transfer of a phenyl group from
的反应的阳离子络合物[钯(4-甲氧基-1,3-η 3环己烯基)(吡啶-2-CHNC6H4OMe-4)] +(1)与BPH 4 -在富马腈产率的存在下反式- 3-甲氧基-6-苯基环己烯(2a)和反式-4-甲氧基-3-苯基环己烯(2b),约。摩尔比为1:1。所述反式这些产品的立体化学意味着烯丙基配体的苯基化涉及从BPH苯基之前转移4 -到金属,随后有机部分的还原偶合。在[钯的反应(η 3-1,1-R 1,R 2 -C 3 H ^ 3)(NN')] +(3)[NN'4 -甲醇4 Ç 6 NCHCHNC 6 ħ 4 OME -4; py-2-CH = NR(R = C6H4OMe-4,Me或CMe 3),2,2'-联吡啶(bipy); [R 1 H,R 2 PH,我; [R 1 - [R 2 我; 与BPH 4 -在活化的烯烃,区域异构体两者的PhCH存在2 CHCR 1