The Sobolev spaces
W
2
n
[
0
;
1
]
W^n_2[0;1]
are treated with five different boundary conditions (periodic, antiperiodic, of even and odd orders, and of even-odd order). Sharp estimates for the derivatives of order
k
=
0
,
1
,
…
,
n
−
1
k=0,1,\dots , n-1
are obtained, sharp constants for the embedding of
W
2
n
[
0
;
1
]
W^n_2[0;1]
into
W
∞
k
[
0
;
1
]
W^k_\infty [0;1]
are found, it is shown that they are rationally expressed in terms of Bernoulli numbers and, therefore, are rational. The exact embedding constants can also be expressed in terms of the Riemann
ζ
\zeta
-function. The reproducing kernels of these spaces are calculated.