“…One class comprises the transformations unstrained alkenes undergo, such as reactions with acids, [3][4][5] dihydroxylations, 5,6 and epoxidations. 7 The second class includes pericyclic reactions, [8][9][10] particularly cycloadditions with 1,3-dipoles or dienes, 1,3,[11][12][13][14][15][16][17][18][19][20][21] that often require strain to make them possible. Although strain-promoted cycloadditions have emerged as important transformations in synthesis 22 and chemical biology, 23 the scope of the reactivity of trans-cycloalkenes beyond these two classes remains limited.…”