... Tetrahedron. Volume 57, Issue 5, 28 January 2001, Pages 827–833. ... 2). Reaction of silylethyne 3 and disilyl-1,3,5,7-octatetrayne 4 takes place at the p-position predominantly, 2. and 5. while disilylated 1,3-butadiyne 2 reacts at the o-position selectively. ...