“…Of these, 1, 5 2, 8,9,11 3, 2,12,15 4, 12 6, 9 7, 17,19 8, 9 9, 12 10, 9 and 11 9 have been described in the refereed literature, and only 2, 6-11 3, 2,12-14 4, 12,13 5, 13 6, 9,10 7, 17,19,20 10, 9,10 and 11 9,10 were isolated in the pure state. Alkynes 12-15 have been made by Zhang and Eaton and are as yet unpublished.…”