4 research outputs found
Rhodium Thiavinyl Carbenes from 1,2,3-Thiadiazoles Enable Modular Synthesis of Multisubstituted Thiophenes
The
rhodium-catalyzed transannulation reaction between 1,2,3-thiadiazoles
and alkynes, proceeding via intermediacy of the previously unknown
Rh thiavinyl carbene, toward a highly efficient and regioselective
synthesis of up to fully substituted thiophenes is described
Heck Reaction of Electronically Diverse Tertiary Alkyl Halides
The efficient Pd-catalyzed Heck reaction
of diverse tertiary alkyl
halides with alkenes has been developed. Unactivated tertiary alkyl
halides efficiently react at room temperature under visible light
irradiation with no exogenous photosensitizers required. For activated
tertiary alkyl halides, the same catalytic system works well without
light. These methods offer a general access to electronically diverse
alkenes possessing quaternary and functionalized tertiary allylic
carbon centers. The substituents at these centers include alkyl-,
carbalkoxy-, tosyl-, phosphonyl-, and boronate groups. It was also
shown that the end-game mechanism of this transformation may vary
depending on the type of the substrates used
Harvesting Water from Air with High-Capacity, Stable Furan-Based MetalāOrganic Frameworks
We synthesized two isoreticular furan-based metalāorganic frameworks (MOFs), MOF-LA2-1(furan) and MOF-LA2-2(furan) with rod-like secondary building units (SBUs) featuring 1D channels, as sorbents for atmospheric water harvesting (LA = long arm). These aluminum-based MOFs demonstrated a combination of high water uptake and stability, exhibiting working capacities of 0.41 and 0.48 g of water per g of MOF (under isobaric conditions of 1.70 kPa), respectively. Remarkably, both MOFs showed negligible loss in water uptake after 165 adsorption-desorption cycles. These working capacities rival those of MOF-LA2-1(pyrazole), which has a working capacity of 0.55 g of water per g of MOF. The current MOFs stand out for their high water stability as evidenced by 165 cycles of water uptake and release. MOF-LA2-2(furan) is the first aluminum MOF to employ a double \u27long arm\u27 extension strategy, confirmed through single-crystal X-ray diffraction (SCXRD). The MOFs were synthesized using a straightforward synthesis route. This study offers valuable insights into designing durable, water-stable MOFs and underscores their potential for efficient water harvesting
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MOF Linker Extension Strategy for Enhanced Atmospheric Water Harvesting
A linker extension strategy for generating metalāorganic frameworks (MOFs) with superior moisture-capturing properties is presented. Applying this design approach involving experiment and computation results in MOF-LA2-1 {[Al(OH)(PZVDC)], where PZVDC2ā is (E)-5-(2-carboxylatovinyl)-1H-pyrazole-3-carboxylate}, which exhibits an approximately 50% water capacity increase compared to the state-of-the-art water-harvesting material MOF-303. The power of this approach is the increase in pore volume while retaining the ability of the MOF to harvest water in arid environments under long-term uptake and release cycling, as well as affording a reduction in regeneration heat and temperature. Density functional theory calculations and Monte Carlo simulations give detailed insight pertaining to framework structure, water interactions within its pores, and the resulting water sorption isotherm