1200-73-3Relevant articles and documents
Scandium(III) triflate catalyzed synthesis of primary homoallylic alcohols via carbonyl-ene reaction
Sultana, Sabera,Bondalapati, Somasekhar,Indukuri, Kiran,Gogoi, Paramartha,Saha, Pipas,Saikia, Anil K.
, p. 1576 - 1578 (2013)
Scandium trifluoromethanesulfonate can efficiently catalyze the formation of homoallylic alcohols from olefins and paraformaldehyde in good yields.
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Emerson et al.
, p. 5314 (1950)
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Facile and recyclable method for the Prins reaction using hafnium(IV) bis(perfluorooctanesulfonyl)amides in fluorous biphase system
Hao, Xiuhua,Hoshi, Nobuto
, p. 1102 - 1103 (2006)
In fluorous biphase system, Hf[N(SO2C8F 17)2]4 has been found to be an efficient catalyst for the Prins reaction of α-methyl styrene with aldehydes at low catalytic loading. The reaction proceeds smoothly and affords the corresponding 1,3-dioxanes in good yields. The catalyst is selectively soluble in lower fluorous phase and can be recovered simply by phase separation. Furthermore, the recovered fluorous phase containing catalyst can be recycled 17 times with yields consistently above 80%. Copyright
Assembly line synthesis of isoprene from formaldehyde and isobutene over SiO2-supported MoP catalysts with active deposited carbon
Qi, Yanlong,Cui, Long,Dai, Quanquan,Li, Yunqi,Bai, Chenxi
, p. 37392 - 37401 (2017)
Isoprene is a very important monomer for synthetic rubber. Its synthesis in the presence of MoP catalysts via the vapour phase reaction of isobutene with formaldehyde has been studied. The catalysis by various catalysts was characterized by TG analysis, the low-temperature adsorption of nitrogen, XRD, element analysis, TPD, the FT-IR of adsorbed pyridine, XPS and MAS NMR. A chemical process was proposed and confirmed. Isoprene was synthesized in an "assembly line" process through different active sites at the surface of the MoP catalysts, where the active sites were derived from P and Mo species and deposited carbonaceous species. In the induction period, carbon species are preferentially deposited on P species, leading to a decrease in the active Mo and P species (active sites 1), accompanied with a burst in active carbonaceous species (active sites 2). This soundly describes the burst in catalyst capacity in the induction period, which then decreases over time on stream at the expense of the active carbonaceous species. Accordingly, through the prior formulation of sites 1 with sites 2 in a catalyst, the time-consuming induction period can be nearly eliminated. We also observed that a good ratio of these two active sites can efficiently retard the catalyst deactivation. This study clarifies the roles of acid sites and active species in MoP catalysts in the synthesis of isoprene and shows that their optimal ratio can help reduce the length of the induction period and extend the lifetime of the catalysts.
Synthesis of ethers and cyclic acetals in the presence of CBV-720 zeolite
Baiburtli,Raskil’dina,Zlotskii
, p. 1098 - 1101 (2017/11/22)
СBV-720 zeolite was compared to H-Beta zeolite and KU-2 cation-exchange resin in the catalytic performance in addition of alcohols to norbornene, in condensation of aldehyde and ketone with di- and triols, and in the Prins reaction of olefins with formaldehyde. These reactions, when performed on СBV-720 zeolite, occur 1.5–2 times faster than on the other catalysts. The corresponding ethers and cyclic acetals were synthesized.
