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                                                                    Exhibit 31.1


                            CERTIFICATION PURSUANT TO
                                 SECTION 302 OF
                         THE SARBANES-OXLEY ACT OF 2002

I, Jeffrey H. Buchalter, certify that:

         1.   I have reviewed this quarterly report on Form 10-Q/A of Enzon
              Pharmaceuticals, Inc. ("Enzon");

         2.   Based on my knowledge, this quarterly report does not contain any
              untrue statement of a material fact or omit to state a material
              fact necessary to make the statements made, in light of the
              circumstances under which such statements were made, not
              misleading with respect to the period covered by this report;

         3.   Based on my knowledge, the financial statements, and other
              financial information included in this quarterly report, fairly
              present in all material respects the financial condition, results
              of operations and cash flows of the registrant as of, and for, the
              periods presented in this report;

         4.   The registrant's other certifying officer and I are responsible
              for establishing and maintaining disclosure controls and
              procedures (as defined in Exchange Act Rules 13a-15(e) and
              15d-15(e)) for the registrant and we have:

              a)  Designed such disclosure controls and procedures, or caused
                  such disclosure controls and procedures to be designed under
                  our supervision, to ensure that material information relating
                  to the registrant, including its consolidated subsidiaries, is
                  made known to us by others within those entities, particularly
                  during the period in which this quarterly report is being
                  prepared;

              b)  Evaluated the effectiveness of the registrant's disclosure
                  controls and procedures and presented in this quarterly report
                  our conclusions about the effectiveness of the disclosure and
                  procedures, as of the end of the period covered by this report
                  based on such evaluation;

              c)  Disclosed in this report any change in the registrant's
                  internal control over financial reporting that occurred during
                  the registrant's most recent fiscal quarter (the registrant's
                  fourth fiscal quarter in the case of an annual report) that
                  has materially affected, or is reasonably likely to materially
                  affect, the registrant's internal control over financial
                  reporting; and

         5.   The registrant's other certifying officer and I have disclosed,
              based on our most recent evaluation of internal control over
              financial reporting, to the registrant's auditors and to the audit
              committee of registrant's board of directors (or persons
              performing the equivalent functions):

              a)  All significant deficiencies and material weaknesses in the
                  design or operation of internal control over financial
                  reporting which are reasonable likely to adversely affect the
                  registrant's ability to record, process, summarize and report
                  financial information; and

              b)  Any fraud, whether or not material, that involves management
                  or other employees who have a significant role in the
                  registrant's internal control over financial reporting.



September 27, 2005                            By: /s/Jeffrey H.Buchalter
                                                 -----------------------------
                                                 Jeffrey H. Buchalter
                                                 Chairman, President and
                                                 Chief Executive Officer
                                                 (Principal Executive Officer)