Section 1917. Effect of conveyance of decedent's interest under contract 1

A  conveyance  of the decedent's interest in all the real property
  held by him under a contract for the purchase  thereof  operates  as  an
  assignment  of  the  contract  to  the  purchaser  and vests in him, his
  distributees and assigns, all the right, title and interest of  all  the
  persons  entitled  at  the  time  of  the  sale in and to the decedent's
  interest in the real property.
    2. A conveyance of the decedent's interest in a part only of the  real
  property  held  under  such  a  contract transfers to the purchaser, his
  distributees and assigns all the decedent's right, title and interest in
  and to the part so sold.
    3.  Upon  fully  complying  with  the  contract  the  purchaser,   his
  distributees  or  assigns  has  the  same  right  to enforce performance
  thereof with respect to the part conveyed to him and  the  fiduciary  or
  his  assignee  has the same right to enforce performance with respect to
  the residue as the decedent would have had if he were living.
    4. Any title acquired by the fiduciary, or his assignee, with  respect
  to  the  part  not sold must be held in trust for the use of the persons
  entitled to the decedent's interest, subject to the dower or curtesy, if
  any, of the spouse.