芳醚树枝形聚合物的合成及分子内光敏异构化反应研究

Synthesis of Poly(aryl ether) Dendrimers and Studies on the Intramolecuar Photosensitization

利用收敛法合成了一代到四代外围带有二苯酮、核心带有降冰片二烯的芳醚树枝形聚合物,初步研究了这些化合物的分子内光敏异构化反应.以波长大于350nm的光选择激发外围的二苯酮官能团引起核心处降冰片二烯基团异构化为四环烷,随着代数的增长,光敏异构化反应的速率逐渐加快.

A series of benzophenone （BP） and norbomadiene （NBD） labeled poly（aryl ether） dendrimers （G：NBD）, generations 1-4, were synthesized. The intramolecular photosensitization was studied. Irradiation with 2〉350 nm of a solution of Gn-NBD in degassed CH2Cl2 at room temperature resulted in a valence isomerization of the norbomadiene group to the quadricyclane group （Gn-QC）. The observed rates of the isomerization became higher with the generation increase.