Let
(
M
,
g
)
(M,g)
be a compact Riemannian manifold of dimension
n
≥
3
n \geq 3
. A well-known conjecture states that the set of constant scalar curvature metrics in the conformal class of
g
g
is compact unless
(
M
,
g
)
(M,g)
is conformally equivalent to the round sphere. In this paper, we construct counterexamples to this conjecture in dimensions
n
≥
52
n \geq 52
.