Journal of the Chemical Society, Dalton Transactions p. 1077 - 1085 (1996)
Update date:2022-08-03
Topics:
Hogarth, Graeme
Norman, Tim
The rigid diphosphine 1,4-bis(diphenylphosphino)-2,5-difluorobenzene (dpfb) has been prepared via addition of 2 equivalents of lithium diphenylphosphide to 1,2,4,5-tetrafluorobenzene and characterised by multinuclear NMR spectroscopy. Reaction with cis-[Mo(CO)4(pip)2] (pip = piperidine) afforded doubly bridged [{Mo(CO)4(μ-dpfb)}2] 1, while with equimolar amounts of dpfb and bis(diphenylphosphino)acetylene (dppa) the mixed-ligand complex [{Mo(CO)4}2(μ-dpfb)(μ-dppa)] 2 was isolated. Both 1 and 2 have been characterised crystallographically. The dfpb ligand always adopts a syn-type configuration. Complex 1 shows a weak π-stacking interaction between the bridging aryl rings, while in 2 the dppa ligand adopts an anti conformation. Variable-temperature multinuclear NMR experiments revealed that 1 undergoes two fluxional processes in solution; twisting of the central core of the molecule and a low-energy process involving the flipping up and down of molybdenum tetracarbonyl units which interconverts the anti and syn conformations of the diphosphines.
View MoreAnhui Jiatiansen Agrochemical Co.,Ltd
Contact:15366811918
Address:chemical industrial park,xiangyu town,dongzhi county,anhui,china
Contact:021
Address:Pudong
Shijiazhuang Haitian Amino Acid Co., Ltd.
Contact:+86-311-88908111
Address:Shijiazhuang Hebei province,China
Henan Techway Chemical Co.,Ltd.
website:http://www.techwaychem.com
Contact:+86-371-66380080
Address:No.27 Shunhe Road,
Shijiazhuang City Xiehe Pharmaceutical Co., Ltd
Contact:+86-311-80817929
Address:Shangzhuang,Shijiazhuang,China
Doi:10.1002/anie.202012299
(2021)Doi:10.1002/jhet.5570340440
(1997)Doi:10.1021/om960061z
(1996)Doi:10.3987/com-95-7327
(1996)Doi:10.1071/CH9860069
(1986)Doi:10.1135/cccc19960276
(1996)
