Panchromatic Ru(II) sensitizers TF-30-TF-33 bearing a new class of 6-quinolin-8-yl-2,2'-bipyridine anchor were synthesized and tested under AM1.5 G simulated solar irradiation. Their increased π conjugation relative to that of the traditional 2,2':6',2''-terpyridine-based anchor led to a remarkable improvement in absorptivity across the whole UV-Vis-NIR spectral regime. Furthermore, the introduction of a bulky tert-butyl substituent on the quinolinyl fragment not only led to an increase in the JSC value owing to the suppression of dye aggregation, but remarkably also resulted in no loss in VOC in comparison with the reference sensitizer containing a tricarboxyterpyridine anchor. The champion sensitizer in DSC devices was found to be TF-32 with a performance of JSC =19.2 mA cm(-2) , VOC =740 mV, FF=0.72, and η=10.19 %. This 6-quinolin-8-yl-2,2'-bipyridine anchor thus serves as a prototype for the next generation of Ru(II) sensitizers with any tridentate ancillary.
The absolute stereochemical assignment of SCH 71450, a selective dopamine D4 receptor antagonist, has been successfully confirmed through enantioselective epimer synthesis. An allyl substituent on the p‐hydroxybenzyl group was demonstrated to be an appropriate protecting group for Noyori Ru‐catalyzed asymmetric transfer hydrogenation of the imine derivative. The construction of the sugar moiety involved a β‐glycosylation reaction assisted by neighboring group participation. By comparison with literature data, the absolute stereochemistry at the C‐1 carbon on the tetrahydroisoquinoline core has been assigned the S configuration.
Panchromatic Ru II sensitizers TF-30-TF-33 bearing a new class of 6-quinolin-8-yl-2,2'-bipyridine anchor were synthesized and tested under AM1.5 G simulated solar irradiation. Their increased p conjugation relative to that of the traditional 2,2':6',2''-terpyridine-based anchor led to a remarkable improvement in absorptivity across the whole UV-Vis-NIR spectral regime. Furthermore, the introduction of a bulky tert-butyl substituent on the quinolinyl fragment not only led to an increase in the J SC value owing to the suppression of dye aggregation, but remarkably also resulted in no loss in V OC in comparison with the reference sensitizer containing a tricarboxyterpyridine anchor. The champion sensitizer in DSC devices was found to be TF-32 with a performance of J SC = 19.2 mA cm À2 , V OC = 740 mV, FF = 0.72, and h = 10.19 %. This 6-quinolin-8-yl-2,2'-bipyridine anchor thus serves as a prototype for the next generation of Ru II sensitizers with any tridentate ancillary.
Two rare sugars – 1‐deoxy‐L‐fructose and L‐sorbose – were synthesized from inexpensive starting materials by a carbonyl translocation method developed in our laboratory. Reduction of a known starting compound gave a 1,5‐diol derivative. Selective protection of the corresponding primary alcohol and oxidation of the secondary alcohol provided the desired product in acyclic, protected form. Subsequent deprotection resulted in the production of 1‐deoxy‐L‐fructose from the known starting material in five steps and in a total yield of 42 %. This approach represents the first report of a chemical synthesis of 1‐deoxy‐L‐fructose. A similar strategy was applied to convert inexpensive D‐glucose into L‐sorbose, which was prepared in five steps from a known starting material in a total yield of 55 %. The synthetic methods represent a complementary method to biological approaches for the synthesis of vitamin C.
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