Photochemistry of Cumulenes and Asymmetric Photochemistry

这项有机和大分子化学基金为新罕布什尔大学理查德·约翰逊博士的研究提供了支持。重点研究了有机化合物的光化学反应机制。这种反应在视觉过程中很重要，并构成了许多工业应用的基础。将研究几个基本问题。第一个问题涉及一类被称为积云的分子，它包含多个π键。具体目标包括对已知反应的详细机理研究，对合成新复杂结构的潜力的调查，以及对新型积云的探索性实验。第二个重点是不对称光反应，即在有机化合物中产生或改变手性的光反应。实验将研究能量传递中的手性，手性双芳的反应，以及圆偏振光的应用。此外，从头算量子力学方法将应用于光化学反应中瞬态中间体的研究。一项具体的研究涉及到反式苯，这是一种新的C6H6异构体，它可能是了解苯光化学的关键。

This grant in Organic and Macromolecular Chemistry provides support for the research of Dr. Richard Johnson, University of New Hampshire. The work is focused on the mechanisms of selected photochemical (light-induced) reactions of organic compounds. Such reactions are important in the visual process and form the basis of numerous industrial applications. Several fundamental problems will be studied. The first concerns a class of molecules known as cumulenes, which contain multiple pi bonds. Specific goals include detailed mechanistic studies of known reactions, investigation of the potential for synthesis of new and complex structures, and exploratory experiments with new types of cumulenes. A second emphasis is on asymmetric photoreactions, that is those which generate or modify chirality in organic compounds. Experiments to study chirality in energy transfer, reactions of chiral biaryls, and applications of circularly polarized light will be carried out. In addition, ab initio quantum mechanical methods will be applied to the study of transient intermediates in photchemical reactions. One specific investigation concerns trans-benzene, a new C6H6 isomer, which may be the key to much of the poorly understood photochemistry of benzene.