“…Most typically, a C−C bond is formed, although other bond types can also be obtained (e.g., C−B, Scheme 17; C−N, 43.7; N−N, 43.4; C−O, 90.2, 98.7, Schemes 96, 97; C−S, 99.2). The new ring, which may be carbo-or heterocyclic, is usually six-membered, although five- (196.4, 197.3; Charts 59, 60; Schemes 263,264,273,275,276), seven-(Schemes 13,156,157,186), and eight-membered rings (Scheme 162; 158.8, 164.3, 206.8, 268.3) have also been prepared. Nevertheless, when rings other than 6-membered are targeted, rearrangements may occur (cf., 33.3).…”