Synthesis of Sedimentary Porphyrin-like Chlorophyll-<i>a</i> Derivatives Lacking the 3-Substituent
作者:Marie Doi、Hitoshi Tamiaki
DOI:10.1246/cl.190911
日期:2020.3.5
Nickel methyl 3-devinyl-pyropheophorbide-a was unexpectedly synthesized by chemical modification of naturally occurring chlorophyll-a. The removal of the 3-substituents proceeded by heating in an a...
Acidic Devinylation of Nickel Chlorophyll Derivatives
作者:Takumi Hisayasu、Nobuyuki Hara、Hitoshi Tamiaki
DOI:10.1246/bcsj.20220224
日期:2022.11.15
The nickel(II) complex of methylpyropheophorbide-a bearing a vinyl group at the 3-position was treated with methanesulfonic acid in refluxing benzene to give smoothly the corresponding 3-devinylated product. The 7- and 8-vinyl groups in the relatedchlorophyll-a/b derivatives were readily removed under the same conditions, while the 12-vinyl group neighboring the electron-withdrawing 13-keto carbonyl
在回流苯中用甲磺酸处理甲基焦脱镁叶绿酸-a的镍 (II) 络合物,在回流苯中顺利地得到相应的 3-脱乙烯基产物。相关叶绿素a / b中的 7-和 8-乙烯基衍生物在相同条件下很容易去除,而与吸电子 13-酮羰基部分相邻的 12-乙烯基几乎没有去功能化。脱乙烯基使二氯甲烷中的所有可见吸收带蓝移。3 位去乙基化移动了最红的 Qy 最大值,而 7、8 和 12 位的去烷基化移动了 Qy(0,0) 最大值,这通过时间依赖性密度泛函理论再现计算。由于在温和条件下没有去除游离碱对应物中的乙烯基外围,地质样品中的镍 3-未取代的脱氧叶红卟啉将通过叶绿素的镍金属化产生 - a / b / c来自古代光养生物或其衍生物,然后是酸性 3-脱乙烯基。
The meso substitution of chlorophyll derivatives: direct route for transformation of bacteriopheophorbides d into bacteriopheophorbides c.
作者:Kevin M. Smith、Dane A. Goff、Daniel J. Simpson
DOI:10.1021/ja00303a021
日期:1985.8
VICENTE, M. GRACA H.;SMITH, KEVIN M., J. ORG. CHEM., 56,(1991) N4, C. 4407-4418
作者:VICENTE, M. GRACA H.、SMITH, KEVIN M.
DOI:——
日期:——
Planar Bischlorophyll Derivatives with a Completely Conjugatedπ-System: Model Compounds for the Special Pair in Photosynthesis
作者:Laurent Jaquinod、Timothy P. Forsyth、Kevin M. Smith、Mathias O. Senge、Ravindra K. Pandey