Anionic Phospho-Fries Rearrangement at Ferrocene: One-Pot Approach to P,O-Substituted Ferrocenes
作者:Marcus Korb、Dieter Schaarschmidt、Heinrich Lang
DOI:10.1021/om5002827
日期:2014.4.28
For the first time the anionic phospho-Fries rearrangement has been successfully applied in ferrocene chemistry, giving access to 1,2-P,O-substituted ferrocenes. The 1,3 (O → C)-migration occurs at ferrocenyl phosphates, thiophosphates, phosphite–borane adducts, and phosphinates by treatment with a base such as lithium diisopropylamide at low temperature, whereas the highest yields were obtained starting
阴离子磷酸-弗里斯重排首次成功地应用于二茂铁化学中,从而获得了1,2-P,O-取代的二茂铁。1,3(O→C)迁移发生于二茂铁基磷酸酯,硫代磷酸酯,亚磷酸酯-硼烷加合物和次膦酸酯,是通过在低温下用碱(如二异丙基氨基化锂)处理来实现的,而从二乙基二茂铁基磷酸酯开始获得最高的收率。膦酸酯的伯膦和随后施特尔策P的完全还原,C交叉耦合允许Fe的合成(η 5 -C 5 H ^ 3 -2-OME-PPH 2)(η 5 -C 5 H ^ 5)(1) 。资质1在钯催化的Suzuki-Miyaura C,C偶合中作为支撑配体已通过在温和的反应条件下以良好或优异的收率合成空间拥挤的三邻位取代的联芳基来证明。
Organometallic ligands
作者:John C. Kotz、Cynthia L. Nivert
DOI:10.1016/s0022-328x(00)95159-3
日期:1973.5
phosphines of the series. The contactshiftedNMR spectra of FcPl2P and Fc2PhP show that spin may not be delocalized from the substituted π-C5H4 ring through the iron atom into the π-C5H5 ring and that more spin density may be delocalized into the phenyl groups than into the ferrocenyl groups; this latter result may be a manifestation of the fact that the phenyl group is less electron releasing than the ferrocenyl
制备了二茂铁基二苯基膦,二二茂铁基苯基膦和三茂铁基膦的配位络合物。对8种可能的化合物(Fc x Ph 3 -x P)M(CO)5(M = Mo,W)的CO拉伸频率的检查表明,A 1 1和E模式的频率降低随着高铁人群的增加。这被解释为是由于二茂铁二茂铁的σ供体能力的同时提高所致。1个的(FC 1 H NMR研究X博士3 -x P)我+我-与甲基双(二甲基乙二酰肟基)(二茂铁基膦)钴(III)表现出相同的趋势,即PMe或CoMe基团被二茂铁基取代度增加而越来越受到保护。尽管膦的σ供体能力随着二茂铁基取代的增加而增加,但配体的空间需求也大大增加。作为证据,在Fc 3 P和甲基双(二甲基乙二肟基)(吡啶)钴(III)的溶液中未观察到配体交换,在相同的膦和双(乙酰丙酮基)镍(II)之间也未观察到络合。然而,对于该系列的其他膦,观察到配体交换或络合。FcPl 2 P和Fc 2的接触位移NMR光谱比索表明自旋可以不从取代的π-C离域5
Synthesis of Hemilabile Phosphine−Phosphine Oxide Ligands via the Highly Selective Pd-Catalyzed Mono-oxidation of Bidentate Phosphines: Scope, Limitations, and Mechanism
作者:Vladimir V. Grushin
DOI:10.1021/om010454k
日期:2001.9.1
The first simple and efficient, one-step catalytic method has been developed for the preparation of bis-phosphine monoxides, valuable hemilabile ligands that have proven usefulness in homogeneous catalysis, synthesis, analytical chemistry, cancer and AIDS research, chemistry of materials, etc. Readily available bidentate phosphines (dppm, dppe, dppp, dppb, dppbz, dppfc, and BINAP) are selectively oxidized
make up an important class of organometallic derivatives with a wide range of useful applications in organic synthesis and coordination chemistry. Here, an approach to ferrocenephosphonates based on a copper-promoted Hirao coupling is reported. Further functionalizations based on regioselective deprotolithiation and both Negishi and Suzuki–Miyaura cross-coupling reactions are also described to reach
Synthesis of 2,2″-bis(diphenylphosphino)-1,1″-biferrocene, a planar chiral bisphosphine, and its palladium(<scp>II</scp>) complex
作者:Masaya Sawamura、Akira Yamauchi、Toshiaki Takegawa、Yoshihiko Ito
DOI:10.1039/c39910000874
日期:——
A new planar chiral bisphosphine, 2,2″-bis(diphenylphosphino)-1,1″-biferrocene (BIFEP), was synthesized via regioselective magnesiation of (diphenylphosphinyl)ferrocene, and converted to its palladium(II) complex.