12083-92-0Relevant articles and documents
(Dicyclopentadiene) platinum(II) dichloride: An efficient catalyst for the hydrosilylation reaction between alkenes and triethoxysilane
Wu, Huarui,Zheng, Chaoyue,Chen, Naiwu,Zhu, Jie,Gao, Deqing
supporting information, p. 1576 - 1578 (2017/04/03)
(Dicyclopentadiene) platinum(II) dichloride was found to be an efficient hydrosilylation catalyst (homogeneous) upon a wide variety of functionalized alkenes and alkenes terminated with chemical moieties (diphenyl amino-, N-carbazol- and N-isoindoline-1,3-dione-). It is noteworthy that the hydrosilylation of aminated alkenes with triethoxysilane exhibited the yield of over 70% and the selectivity (γ-isomer/β-isomer) of more than 3/1. Due to steric hindrance lowering Markovnikov probability, the alkenes with big terminal moieties (diphenyl amino-, N-carbazol- and N-isoindoline-1,3-dione-) presented the high ratio of anti-Markovnikov isomers. The strategy of the hydrosilylation of the protected diamino chelating alkene was developed.
Convenient preparation of (η4-alkadiene)dichloroplatinum(II) complexes from [PtCl6]2- anions and their reduction to platinum(0) alkene complexes under phase-transfer catalysis conditions
Dell'Amico, Daniela Belli,Labella, Luca,Marchetti, Fabio,Samaritani, Simona
, p. 1349 - 1354 (2011/05/09)
Convenient one-pot reduction-complexation reactions of hexachloroplatinato(IV) anions to (η4-alkadiene) dichloroplatinum(II) complexes (η4-alkadiene = COD, DAE, DCPD, NBD) under suitable phase-transfer catalysis conditions are reported. Reduction to zerovalent platinum alkene complexes has been obtained in the presence of an excess of alkene, potassium formate and 18-crown-6 as phase-transfer catalyst (alkene = COD, NB, dba). The crystal and molecular structure of [Pt 1.03(dba)3]·CH2Cl2 has been studied by X-ray diffraction methods: it can be described as a solid solution of Pt(dba)3 and Pt2(dba)3, the mononuclear complex being largely prevailing.
In-plane coordinated double bonds. Molecular structures, spectroscopy, and stability of 5-methylenecyclooctene and 5-methylenecycloheptene complexes of platinum(II)
Rakowsky, Margaret H.,Woolcock, John C.,Wright, Laura L.,Green, David B.,Rettig, Michael F.,Wing, Richard M.
, p. 1211 - 1218 (2008/10/08)
A series of platinum(II) complexes having coordinated olefin constrained to lie in the square plane of coordination has been synthesized and characterized. The diolefin chelates used in this work are 5-methylenecycloheptene (MCH) and 5-methylenecyclooctene (MCOT). Since this class of compounds is of marginal stability, the diolefins, synthesis conditions, and metal substrates must be carefully chosen [e.g., all attempts to prepare Pd(II) analogues result in facile chloropalladation]. Analysis of X-ray and NMR data leads to the conclusion that the in-plane olefin is more weakly bound to platinum than is the out-of-plane olefin, and the principal source of instability is the close contact of terminal exocyclic carbon and gem-cis atom [2.82 (1) ? for C9 and C12 in (MCOT)PtCl2 (4a), for example]. Several lines of evidence indicate that MCH forms more stable complexes than does MCOT [e.g., MCH displaces MCOT from (MCOT)PtCl2 to yield (MCH)PtCl2]. Reaction of (MCH)PtCl2 with (C6H5)Sn(CH3)3 leads to either (MCH)PtClPh (6) or (MCH)PtPh2 (7). The phenyl ligand in the former complex has large cis and trans influences (seen in X-ray and NMR results) of opposite sign. Virtually any diene displaces MCOT from (MCOT)PtCl2. Even bridging bromide is a better ligand than the exocyclic olefin in MCOT. Thus (η4-MCOT)PtBr2 (4b) readily dimerizes to [(η2-MCOT)PtBr(η-Br)]2. The kinetics and thermodynamics of this dimerization/dedimerization are reported. In the course of the present work, the molecular structures of the following five compounds were determined by X-ray diffraction: 4a, 4b, 6, 7, and dichloro[(1,2,5,6-η4)-2,5-dimethyl-1,5-hexadiene]platinum(II) (9). Crystal data for 4a: C9H14Cl2Pt, space group C2/c with a = 14.954 (2) ?, b = 7.233 (2) ?, c = 18.726 (5) ?, β = 94.01 (2)°, V = 2021 (1) ?3, Z = 8. Crystal data for 4b: C9H14Br2Pt, space group C2/c with a = 15.317 (3) ?, b = 7.427 (2) ?, c = 18.920 (3) ?, β = 93.68 (1)°, V = 2148 (1) ?3, Z = 8. Crystal data for 6: C14H17ClPt, space group Pbca with a = 12.380 (2) ?, b = 12.757 (4) ?, c = 16.559 (3) ?, V = 2615 (2) ?3, Z = 8. Crystal data for 7: C20H22Pt, space group P212121 with a = 6.250 (3) ?, b = 14.694 (4) ?, c = 17.796 (5) ?, V = 1634 (2) ?3, Z = 4. Crystal data for 9: C8H14Cl2Pt, space group P21/n with a = 7.633 (3) ?, b = 12.147 (1) ?, c = 11.048 (1) ?, β = 97.84 (2)°, V = 1014.8 (6) ?3, Z = 8.
