Tetraphenylbismuth V reagents react with enolic sytems under acidic or basic conditions to give predictably different intermediates; these fragment with variable, but anticipated, regioselectivity.
                                    四苯基
铋V试剂在酸性或碱性条件下与烯醇体系反应生成可预测的不同中间体。这些片段具有可变的但预期的区域选择性。