18127-01-0Relevant articles and documents
Coordination of bis(azol-1-yl)methane-based bisphosphines towards RuII, RhI, PdII and PtII: synthesis, structural and catalytic studies
Bhat, Sajad A.,Pandey, Madhusudan K.,Mague, Joel T.,Balakrishna, Maravanji S.
, p. 227 - 241 (2017)
The coordination chemistry of bisphosphine ligands assembled on the five-membered heterocyclic platform of bis(azol-1-yl)methane viz.: bis(2-diphenylphosphinoimidazol-1-yl)methane (1), bis(5-diphenylphosphinopyrazol-1-yl)methane (2) and bis(5-diphenylphosphino-1,2,4-triazol-1-yl)methane (3) with RuII, RhI, PdII and PtII is described. The bisphosphines 1-3 react with elemental selenium to give the corresponding bis-selenoyl derivatives 4-6. The reactions of 1-3 with transition metal derivatives produce complexes with different coordination modes. Bisphosphine 1 showed a preference for the κ2-P,P mode of coordination, whereas bisphosphines 2 and 3, besides the κ2-P,P mode also showed a head-to-tail κ2-P,N coordination mode resulting in the formation of binuclear complexes [Rh2(COD)2{(CH2(1,2-C3H2N2PPh2)2)-κ2P,N}][BF4]2 (14), [Rh2(COD)2{(CH2(1,2,4-C2HN3PPh2)2)-κ2P,N}][BF4]2 (15), [Pd2(η3-C3H5)2{(CH2(1,2-C3H2N2PPh2)2)-κ2P,N}][BF4]2 (21) and [Pd2(η3-C3H5)2{(CH2(1,2,4-C2HN3PPh2)2)-κ2P,N}][BF4]2 (22). Several of these complexes have also been structurally characterized. The in situ generated RhI complex of bisphosphine 1 showed moderate to good selectivity in the hydroformylation of various styrene derivatives.
Preparation method of 4-tert-butyl phenylpropionaldehyde
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Paragraph 0026-0063, (2021/03/13)
The invention discloses a preparation method of 4-tert-butyl phenylpropionaldehyde, which comprises the following steps: carrying out hydroformylation reaction by using 4-tert-butyl styrene as a raw material to obtain 4-tert-butyl phenylpropionaldehyde, wherein the solvent is dimethylformamide, the catalyst is a rhodium catalyst, the rhodium catalyst is Rh(CO)2C5H7O2, RhHCO(PPh3)3 or Rh(C5H7O2)(CO)(PPh3), the auxiliary agent is a phosphine ligand and an organic alkali compound, the phosphine ligand is diphenyl phosphite, tris (o-methylphenylphosphine) or bis (2,4-dicumylphenyl)pentaerythritoldiphosphite, the organic alkali compound is triethylamine, triphenylphosphine oxide or N,N-diisopropylethylamine. According to the method, the 4-tert-butyl styrene is used as the raw material to prepare 4-tert-butyl phenylpropionaldehyde through one-step hydroformylation reaction, wherein the raw material conversion rate is higher than 98%, and the product yield is higher than 80%. The compound issimple in preparation method, low in production cost and small in environmental harm.
Preparation method of P-tert-butylphenylpropionaldehyde
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, (2020/02/14)
The invention relates to a preparation method of p-tert-butyl phenylpropionaldehyde. The preparation method comprises the following steps: subjecting p-tert-butylbenzaldehyde, alkyl orthoformate and afirst catalyst to mixing and a reaction, then adding vinyl ether, carrying out mixing and a reaction, then adding a second catalyst and a second solvent, performing a hydrolysis reaction, and finallysubjecting obtained supernatant containing a reaction product to catalytic hydrogenation to obtain p-tert-butylphenylpropionaldehyde. Through selection of a specific catalyst, the multi-step reactions of the method provided by the invention can be continuously carried out; separation and extraction of an intermediate product are not needed; the multi-step reactions can be realized in one reactionsystem; according to a technical scheme provided by the invention, the product is prepared from the raw materials through one-pot reactions, and reaction conditions are mild; and the obtained p-tert-butylphenylpropionaldehyde has a content of 70% or above, is colorless transparent oily liquid, and can be directly used for essence preparation, and the highest yield can reach 93.1%.
