1985 年 105 巻 5 号 p. 415-429
A new concept of cyclic conjugation as a modification of the Huckel rule has proven to be useful as a general method of predicting thermal stabilities and electonic peoperties of unsaturated cyclic organic molecules. We have been applying this concept to the design of reagents such as p-benzoquinone and 1, 4-dithins. Pericyclic syntheses are very valuable method for the high stereo-, regio-, and periselective controls, and they could provide a logical assembling of molecules, especially highly strained cage compounds which are available or not available for natural sources. These pericyclic reactions are discussed in terms of frontier molecular orbital theory.