and BRF derived from dehydrocholic acid (3by), have all been explored under the standard conditions, leading to the desired products in moderate yields. Internal alkynes derived from triclosan or estrone were also effective substrates to furnish the desired alkenes (3cb and 3cc) in 71% and 66% yields. However, in most cases, a nearly 1:1 mixture of the two stereoisomers were obtained. Attempts to enhance the stereoselectivity of this reaction by introducing bulky substitutions on the substrates were unsuccessful, although some of the relatively bulky substrates (3bu and 3ca) give Z/E ratios of 2:1 or 2.8:1. Given the propensity of olefins to undergo photosensitization , we assumed that the diminished stereoselectivity of the products might be attributed to the photoisomerization process under the standard conditions.