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- W2953173839 startingPage "514" @default.
- W2953173839 abstract "The (2 + 2)cycloaddition and its reversion continues to claim attention due to the facility of forward and reverse processes and the stability associated with novel polycyclic (caged) structures. These systems show an extreme sensitivity to donor–acceptor interaction and have already served admirably as mechanistic probes. The cycloaddition of two π bonds to yield a cyclobutane ring holds an important place in the annals of photochemistry. This potentially reversible transformation has become a celebrated example of a reaction that is kinetically inhibited as a thermally induced process due to orbital symmetry or topology constraints. The kinetic stability of photogenerated small rings is an important feature insuring the synthetic viability of many strained ring systems and the potential for photochemical energy storage. This chapter focuses on the theme of mechanisms of photoreactions of the (2 + 2) type (and the photoreversion), which have some potential for photochromic activity. The impressive variety of conditions in which photoisomerization will take place and the array of intermediates encountered (excited triplets, exciplexes, radical-ions, donor–acceptor complexes) have made these reversible systems a rich field for investigation." @default.
- W2953173839 created "2019-06-27" @default.
- W2953173839 creator A5002528693 @default.
- W2953173839 date "2003-01-01" @default.
- W2953173839 modified "2023-10-12" @default.
- W2953173839 title "Cycloaddition Reactions Involving 4n Electrons: (2+2) Cycloaddition; Photochemical Energy Storage Systems Based on Reversible Valence Photoisomerization" @default.
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