Alternating copolymerization of CO2 and propylene oxide catalyzed by C2v-porphyrin cobalt: Selectivity control and a kinetic study

Quaternary onium modified SalenCoXY catalysts for alternating copolymerization of CO2 and propylene oxide: A kinetic study

“…5, path b) of PO and CO 2 , some preliminary kinetic studies were carried out by using 4Cc (see Supplementary material, Tables S2-S5, Figs. S3-S6), in which, the pseudo first order reactions to the PO concentration for copolymerization and cycloaddition reaction were applied in this event, which was consistent with our previous report using the catalyst system of metalloporphyrin/cocatalyst [31,33]. These pseudo first order reactions revealed a competitive relationship between the formation of PPC (path a) and CPC (path b), which implied the PPC depolymerization (path c) might not undergo during the progress of reactions.…”

“…The reaction mixture was heated at reflux for 2 h. The solvent was evaporated to yield the cobalt(II) complex, which was then dissolved in dichloromethane. The relevant phenol was proportionally added to the solution and stirred in air for 3 h. After removal of the solvent, the desired catalyst was acquired [33]. …”

“…Recently, we reported a competition mechanism between the polymerization and cycloaddition using C 2v cobaltoporphyrin catalysts [33]. Bimetallic copolymerization is the most efficient way to produce polycarbonates with few papers showing mechanistic and computational support for this.…”

Metalated porous porphyrin polymers as efficient heterogeneous catalysts for cycloaddition of epoxides with CO2 under ambient conditions

“…Notably, the POP-TPP gives the conversion at 52.1% (entry 1 in Table 1), but the Co/ POP-TPP exhibits the conversion at 95.6% (entry 2 in Table 1), which is completely comparable with that of the homogeneous Co/TPP catalyst (97.4%, entry 3 in Table 1). These results indicate that the Co/POP-TPP is very active and cobalt species play an important role for this reaction [12,59,60]. As control tests, the reactions are performed with Co/POP-TPP and Co/TPP in the absence of n-Bu 4 NBr or without Co/POP-TPP and Co/TPP in the presence of n-Bu 4 NBr, as presented in Table 1 (entry 4-6).…”

Near‐Infrared‐Absorbing Metal‐Free Organic, Porphyrin, and Phthalocyanine Sensitizers for Panchromatic Dye‐Sensitized Solar Cells

“…Typically, these building blocks exhibit a very strong high energy transition in the absorbance spectrum (Soret band) near 400–500 nm and a low energy transition around 600 nm (Q band) owing to π–π* transitions. Synthesis of dissymmetric porphyrin dyes often begins by condensing paraformaldehyde with solvent quantities of pyrrole to form a methylenedipyrrole intermediate . Subsequently, a macrocyclization is performed under dilute conditions using formylated aryl groups as electrophiles followed by oxidation to form the aromatic porphyrin periphery .…”