A four-member ring hypervalent iodine radical has been detected in the laser flash photolysis of 1,3-diiodo-1,3-diphenylpropane. This species absorbs at 320 nn, has a lifetime of similar to 9.5 mu s in cyclohexane, and is not quenchable by oxygen. Excitation of this radical by means of laser-drop photolysis results the formation of trans-1,2-diphenylcyclopropane through concerted iodine extrusion.
Lewis Acid Mediated Reactions of Aldehydes with Styrene Derivatives: Synthesis of 1,3-Dihalo-1,3-diarylpropanes and 3-Chloro-1,3-diarylpropanols
作者:George W. Kabalka、Zhongzhi Wu、Yuhong Ju、Min-Liang Yao
DOI:10.1021/jo051298k
日期:2005.12.1
The reactions of aryl aldehydes with styrene derivatives, mediated by various boron Lewis acids, were investigated. 1,3-Dihalo-1,3-diarylpropanes were obtained in high yields with boron trihalides, while 3-chloro-1,3-diarylpropanols were obtained in good to excellent yields with phenylboron dichloride. Reactions involving nonenolizable aliphatic aldehydes, trans-cinnamaldehyde, and β-substituted styrenes