Enantiomerically pure 1,2-bis(isopropylmethylphosphino)benzene and its use in highly enantioselective Rh-catalyzed asymmetric hydrogenation
摘要:
A new P-chiral phosphine ligand with a 1,2-phenylene unit, (S,S)-1,2-bis(isopropylmethylphosphino)benzene, has been synthesized from 1,2-bis(methylphosphino)benzene. Its rhodium complex is highly effective in asymmetric hydrogenation of dehydroamino acid methyl esters to provide enantioselectivities of up to 98%. (C) 1999 Elsevier Science Ltd. All rights reserved.
Optically active asymmetric di(tertiary phosphines). Crystal and molecular structure of [SP-4-3-(SP,S )]-{1-[(2-chlorophenyl)methylphosphino]-2-(dimethylphosphino)benzene-P,P ′ }{1-[1-(dimethylamino)ethyl]naphthyl-C 2,N }palladium(II) hexafluorophosphate
作者:Swarup Chatterjee、Mark D. George、Geoffrey Salem、Anthony C. Willis
DOI:10.1039/b101182k
日期:——
sodium in THF followed by the addition of 1,2-dichlorobenzene to give (±)-(2-chlorophenyl)(2-dimethylphosphinophenyl)methylphosphine and unchanged 1,2-phenylenebis(dimethylphosphine). The two di(tertiaryphosphines) are readily separated by fractional distillation. Asymmetric di(tertiaryphosphine) (±)-(2-chlorophenyl)(2-dimethylphosphinophenyl)methylphosphine has been resolved by separation via fractional
双(仲膦)(R P *,R P *)-和(R P *,S P *)-1,2-亚苯基双(甲基膦)的单去质子化反应是使用钾在液氨中得到的钙。在相同溶剂中加入甲基碘溶液后,(±)-1-(二甲基膦基)-2-(甲基膦基)苯与1,2-亚苯基双(二甲基膦基)的4∶1混合物。将该混合物在THF中用钠进一步处理,然后加入1,2-二氯苯,得到(±)-(2-氯苯基)(2-二甲基膦基苯基)甲基膦和未改变的1,2-亚苯基双(二甲基膦)。两种二叔膦很容易通过分馏分离。不对称二(叔膦)(±)-(2-氯苯基)(2-二甲基膦基苯基)甲基膦已通过分步结晶分离了内部非对映体钯(II)配合物,该配合物含有外消旋配体并经正金属化(S)-二甲基[1-(1-萘基)乙基]胺。配体的R对映异构体的绝对构型已通过晶体结构测定最难溶的非对映异构钯(II)配合物[ SP -4-3-(S P,S)] 1-[(2-氯苯基) )甲基膦基] -2-(二甲基膦基)苯-P,P
Mononuclear gold(I) complex of a chiral tetra(tertiary phosphine). Crystal and molecular structure of [T-4-(RP*,RP*)]-(±)-1,2-bis[(2-diphenylphosphinophenyl)methylphosphino]benzene-P,P′,P″,P‴gold(I) hexafluorophosphate
作者:Swarup Chatterjee、Felicity K. E. Moore、Geoffrey Salem、Paul Waring、Anthony C. Willis
DOI:10.1039/b007363f
日期:——
A mononuclear tetra(tertiary phosphine)gold(I) complex has been isolated via the reaction of (RP*,RP*)-1,2-bis[(2-dimethylphosphinophenyl)methylphosphino]benzene, (RP*,RP*)-TPP4, with NBun4[AuI2] in ethanol followed by metathesis with aqueous NH4PF6; as confirmed by a crystalstructure determination of [Au(RP*,RP*)-TPP4}]PF6.
的单核四(叔膦)金(我)络合物已经分离通过(的反应- [R P *,- [R P 1,2-双[(2- dimethylphosphinophenyl)甲基膦]苯,( - *)- [R P *,- [R P *)-TPP 4,其中NBu n 4 [AuI 2 ]在乙醇 其次是 复分解用NH 4 PF 6水溶液; 如通过[Au (R P *,R P *)-TPP 4 }] PF 6的晶体结构确定所确认的。
Use of Chelating Diphosphines To Prepare New Phosphido Clusters of Aluminum and Gallium
作者:David A. Atwood、Alan H. Cowley、Richard A. Jones、Ronald J. Powell、Christine M. Nunn
DOI:10.1021/om960122t
日期:1996.5.28
Novel phosphido cluster complexes of formula (Me(2)M)(4)(mu-(1,2-PR)(2)C6H4)(2) (M = Al, R = Me (1); M = Ga, R = t-Bu (2)) result when the chelating diphosphine ligand 1,2-bis(alkylphosphino)benzene is mixed with trialkylaluminum and -gallium reagents. When the potentially chelating ligand 1,2-bis(tert-butylphosphino)ethane is mixed with 2 equiv of AlMe(3) under the same conditions, the secondary phosphine bis-adduct complex Me(3)Al . PH(t-Bu)CH2CH2(t-Bu)HP . AlMe(3) (3) is formed.
Issleib, K.; Leissring, E.; Riemer, M., Zeitschrift fur Anorganische und Allgemeine Chemie
作者:Issleib, K.、Leissring, E.、Riemer, M.
DOI:——
日期:——
KYBA, E. P.;LIU, SHIUH-TZUNG;HARRIS, R. L., ORGANOMETALLICS, 1983, 2, N 12, 1877-1879