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Chlorophyll-a was chemically modified to methyl pyropheophorbides-a possessing 3,8-diethyl, 3-vinyl-8-ethyl, 3-ethyl-8-vinyl, and 3,8-divinyl groups. Analogous 3-ethyl-7-vinyl- and 3,7-divinyl-chlorins were prepared by derivatization of chlorophyll-b. The synthetic free bases as well as zinc 3-vinyl-chlorins were dissolved in THF and the monomeric diluted solutions were characterized by optical spectroscopy...
Regioisomeric 3- and 8-vinylchlorins as well as 7- and 12-vinylchlorins were prepared by modifying naturally occurring chlorophylls-a and/or b. The corresponding formylchlorins were synthesized by oxidation of the 3/8-vinyl, 7-hydroxymethyl or 12-methyl groups and readily transformed to the vinylchlorins by Wittig reactions. Their visible absorption, circular dichroism, fluorescence emission spectra...
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