20-( N -Methylpyridiniumyl)ethynylated chlorophyll- a derivative with an intense Qx absorption band at a green to orange region
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DOI: 10.1016/j.tetlet.2018.01.052
Abstract: Abstract Methyl 20-substituted mesopyropheophorbides-a were prepared by the chemical modification of natural chlorophyll-a via palladium-catalyzed cross-coupling reactions. The 20-ethynylation and further 2-pyridylation showed bathochromic shifts in their visible absorption bands as well as hyperchromic effects… read more here.
Keywords: absorption; methylpyridiniumyl ethynylated; intense absorption; ethynylated chlorophyll ... See more keywords
Covalently linked dimer of chlorophyll-a derivative with an amide bond and its folded conformer
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DOI: 10.1016/j.tetlet.2018.07.004
Abstract: Abstract A chlorophyll-a derivative homo-dimer covalently linked with a flexible methylene-amino-methylene group at the 3-position was benzoylated to give the dyad bearing a CH2N(COPh)CH2 linker. The synthetic dyad with the relatively rigid spacer showed red-shifted… read more here.
Keywords: dimer chlorophyll; chlorophyll derivative; linked dimer; covalently linked ... See more keywords
Synthesis of 18-formylated B-ring reduced chlorophyll derivative as a heme A analog and effect of the 18-substituent on optical properties
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DOI: 10.1016/j.tetlet.2021.152921
Abstract: Abstract Methyl 17,18-didehydro-pyrobacteriopheophorbides-a possessing the 18-formyl and hydroxymethyl groups as chlorophyllous analogs of hemes A and I, respectively, were prepared by chemically modifying the corresponding 18-methyl counterpart via 17,18-cis-dihydroxylation and successive acidic mono-dehydration. As an… read more here.
Keywords: synthesis formylated; derivative heme; ring reduced; reduced chlorophyll ... See more keywords