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We work with differential expressions of the form \begin{align} \tau_{2n+1} y&=(-1)^ni \{(q_{0}y^{(n+1)})^{(n)}+(q_{0}y^{(n)})^{(n+1)}\}+\sum\limits_{k=0}^{n}(-1)^{n+k}(p^{(k)}_ky^{(n-k)})^{(n-k)} \\&\qquad+i\sum\limits_{k=1}^{n}(-1)^{n+k+1}\{(q^{(k)}_{k}y^{(n+1-k)})^{(n-k)}+(q^{(k)}_{k}y^{(n-k)})^{(n+1-k)}\}, \end{align} where the complex valuedcoefficients $p_j$ and $q_j$ are subject the following conditions: $ q_0(x) \inAC_{loc}(a,b)$, $Re \,q_0>0$, while all the other functions$$q_1(x),q_2(x),\ldots,q_{n}(x), p_0(x),p_1(x),\ldots,p_n(x)$$ belong to thespace $L^1_{loc}(a,b)$. This implies that the coefficients $p^{(k)}_{k}$ and$q^{(k)}_{k}$ in the expression $\tau_{2n+1}$ are distributions of singularityorder $k$. The main objective of the paper is to represent the differentialexpression $\tau_{2n+1}$ in the other (regularized) form which allows to definethe minimal and maximal operators associated with this differential expression.

Odinary differential operators of odd order with distribution coefficients