water-soluble polymer has been explored for its use as a host for lipophilic substrates in aqueous medium. Unimolecular reactions, namely, photo-Fries rearrangement of naphthyl esters, alpha-cleavage reaction of 1-phenyl-3-p-tolyl-propan-2-one, and Norrishtype I and typeII reactions of benzoin alkyl ethers were examined. We find that the hydrophobic domains generated by the polymer not only restrict the mobility
苯乙烯基水溶性聚合物已被探索用作水性介质中亲脂性底物的主体。检查了单分子反应,即萘酯的 photo-Fries 重排、1-苯基-3-p-tolyl-propan-2-one 的 α-裂解反应和安息香烷基醚的 Norrish I 型和 II 型反应。我们发现聚合物产生的疏水域不仅限制了自由基的移动性,而且在反应的时间尺度内适度限制了底物、中间体和产物。由小分子表面活性剂和两亲性二嵌段共聚物形成的胶束中相同光反应的比较研究表明,水性介质中的苯乙烯基水溶性聚合物聚集体提供更好的选择性。
Photo-Fries reaction in water made selective with a capsule
作者:Lakshmi S. Kaanumalle、Corinne L. D. Gibb、Bruce C. Gibb、V. Ramamurthy
DOI:10.1039/b617022f
日期:——
The water soluble capsule formed by a deep cavity cavitand with eight carboxylic acid groups controls product distribution during photo-Fries rearrangement of naphthyl esters in water by restricting the mobility of primary singletradical pair.
Photo-Fries Reactions of 1-Naphthyl Esters in Cation-Exchanged Zeolite Y and Polyethylene Media
作者:Weiqiang Gu、Manoj Warrier、V. Ramamurthy、Richard G. Weiss
DOI:10.1021/ja990818o
日期:1999.10.1
Cyclodextrin-mediated regioselective photo-Fries reaction of 1-naphthyl phenyl acylates
作者:Smriti Koodanjeri、Ajit R Pradhan、Lakshmi S Kaanumalle、V Ramamurthy
DOI:10.1016/s0040-4039(03)00422-2
日期:2003.4
1-Naphthyl phenyl acylates upon irradiation in solution yield eight products via beta-cleavage process. However, excitation of these molecules as included in gamma-cyclodextrin results in a single product (>95%). This medium dependent product selectivity is attributed to conformational and translational restrictions enforced on the reactant as well as intermediates by the cyclodextrin cavity. (C) 2003 Elsevier Science Ltd. All rights reserved.
Alkali Ion Exchanged Nafion as a Confining Medium for Photochemical Reactions†
作者:Selvanathan Arumugam、Lakshmi S. Kaanumalle、V. Ramamurthy
DOI:10.1562/2005-05-05-ra-515
日期:——
beads were used as microreactors to control the photochemical reaction pathways. Product selectivity in three unimolecular reactions, namely, the photo-Fries rearrangement of naphthyl esters, NorrishType I reaction of 1-phenyl-3-p-tolyl-propan-2-one and NorrishType I and TypeIIreactions of benzoin alkyl ethers were examined. The influence of cations over the photodimerization of acenaphthylene and