SECURITIES AND EXCHANGE COMMISSION
                              Washington, DC 20549



                                    FORM 8-K



                             Current Report Pursuant
                          to Section 13 or 15(d) of the
                         Securities Exchange Act of 1934



    Date of report (Date of earliest event reported)        September 18, 2002
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                               UNOCAL CORPORATION
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             (Exact name of registrant as specified in its charter)



                                    Delaware
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                 (State or Other Jurisdiction of Incorporation)



    1-8483                                   95-3825062
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(Commission File Number)                (I.R.S. Employer Identification No.)



2141 Rosecrans Avenue, Suite 4000, El Segundo, California         90245
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(Address of Principal Executive Offices)                       (Zip Code)



                                 (310) 726-7600
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              (Registrant's Telephone Number, Including Area Code)



Item 5.      Other Events.


Pending Exchange Offer for Minority Interest in Pure Resources, Inc.

On September 5, 2002,  Union Oil Company of California  ("Union  Oil"), a wholly
owned subsidiary of Unocal  Corporation  ("Unocal" and, together with Union Oil,
the  "Company"),  commenced an exchange offer to acquire all of the  outstanding
shares of the common stock of Pure Resources,  Inc.  ("Pure"),  that it does not
already own.  Union Oil currently owns  32,709,067  shares of Pure common stock,
representing approximately 65 percent of the outstanding shares. Pursuant to the
exchange  offer,  Union Oil is offering to exchange  0.6527 of a share of Unocal
common stock for each outstanding share of Pure common stock, upon the terms and
conditions set forth in the prospectus  related to the exchange offer, which was
filed with the  Securities and Exchange  Commission  (the "SEC") on September 4,
2002, as part of Unocal's  Registration  Statement on Form S-4 (Registration No.
333-99147),  and the  related  letter  of  transmittal.  Union  Oil  will not be
obligated  to acquire any shares of Pure in the offer  unless Pure  stockholders
(other than the Company and its  subsidiaries)  have  validly  tendered  and not
properly  withdrawn  prior to the  expiration of the offer a number of shares of
Pure common  stock such that,  giving  effect to the offer,  the Company owns at
least 90 percent of the total number of  outstanding  shares of Pure.  There are
also other conditions to the offer that are described in the prospectus.

If the Company  successfully  completes the offer and then owns at least 90
percent of the  outstanding  shares of Pure common  stock, it would be permitted
under  Delaware  law to effect a "short  form" merger of one of its wholly owned
subsidiaries  with Pure without the approval of Pure's board of directors or its
remaining  stockholders.  The Company intends to effect a "short form" merger of
one of its wholly owned  subsidiaries  with Pure as soon as practicable after it
completes the offer. In such event,  each outstanding share of Pure common stock
the  Company  does not own or acquire  in the offer  would be  converted  in the
merger into the right to receive  0.6527 of a share of Unocal  common  stock and
cash instead of  fractional  shares--the  same  consideration  per share of Pure
common stock which such  unexchanged  minority  stockholders  of Pure would have
received if they had tendered their shares into the offer-- unless they properly
perfect  their  appraisal  rights under  Delaware law.  After  completion of the
merger, Pure would be a wholly owned subsidiary of the Company.

Following  Unocal's  announcement  of the offer,  on or about  August 21,  2002,
individual  stockholders  of Pure  filed  complaints  in the  Delaware  Court of
Chancery purporting to commence class action lawsuits against Unocal, Union Oil,
Pure and each of the individual directors of Pure. The complaints were styled as
Crescente v. Pure  Resources,  Inc.,  et al.  (C.A.  No.  19854),  Brown v. Pure
Resources,  Inc.,  et  al.  (C.A.  No.  19855),  Summit  Trading  Group,  LLC v.
Hightower, et al. (C.A. No. 19856), Metera v. Pure Resources, Inc., et al. (C.A.
No. 19857) and Bistritzky v.  Hightower,  et al.(C.  A. No. 19859).  On or about
August 30, 2002, a separate  action was filed in California  Superior  Court for
the County of Los Angeles, styled as Holland v. Pure Resources, Inc., et al. (BC
280478). In general,  the complaints allege, among other things: (1) breaches of
fiduciary duty by the Company, Pure and the members of Pure's board of directors
in  connection  with  the  offer  and  the  subsequent   merger;  (2)  that  the
consideration the Company is offering is inadequate; and (3) that the Company is
acting to further its own  interests at the expense of the  minority  holders of
Pure's common stock.  Among other  remedies,  the complaints  seek to enjoin the
offer and subsequent  merger or,  alternatively,  seek damages in an unspecified
amount and rescission in the event the merger occurs.

On  September  3,  2002,  a  separate  purported  class  action was filed in the
Delaware  Court of  Chancery  styled  as  Cardinal  Capital  Management,  LLC v.
Amerman,  et al. (C.A.  No. 19876)  against the same  defendants as in the other
actions,  as well as the directors of Unocal.  This  complaint  alleges that the
offer is  inadequate,  coercive and  otherwise  contrary to law. On September 5,
2002,  the  plaintiff in the Cardinal  Capital case  requested and was granted a
hearing  on its  motion  for a  preliminary  injunction  against  the  offer and
expedited  discovery in connection  with the hearing.  The Court has scheduled a
hearing on the Cardinal Capital motion for September 27, 2002.

                                      -1-


The Company is defending  these actions and does not expect their resolution  to
have a material adverse effect on the Company's financial condition or liquidity
or, based on management's current assessment of the cases, the Company's results
of operations.

On September 18, 2002,  Pure announced that a special  committee of its board of
directors  had  determined  that the  offer was  inadequate  and not in the best
interests of Pure's stockholders,  other than Union Oil and its affiliates,  and
that,  accordingly,  the special  committee  recommends  that Pure  stockholders
reject the offer and not tender their shares in the offer. Pure also stated that
Jack  Hightower,  Pure's  Chairman  of the Board,  Chief  Executive  Officer and
President, and Pure's other executive officers have told Pure that they will not
tender their shares in the offer.  More  detailed  information  regarding  these
matters appear in the Schedule 14D-9 filed by Pure with the SEC on September 18,
2002.

Myanmar Litigation

In 1996,  two  related  actions  were  filed  against  the  Company in the U. S.
District  Court for the  Central  District  of  California  (the "Doe" and "Roe"
cases) by various  former  residents of the  Tenasserim  region of Myanmar.  The
plaintiffs  in those  actions  claimed that they were injured by soldiers of the
Myanmar military in connection with the Yadana natural gas pipeline,  which runs
through the region.  In 2000,  the District  Court granted  summary  judgment in
favor of the Company on all of the plaintiffs' federal claims and dismissed them
with prejudice.  The Court also dismissed the  plaintiffs'  related claims under
California law without  prejudice.  Subsequently,  the  plaintiffs  appealed the
dismissal  of their  federal  claims to the U. S. Court of Appeals for the Ninth
Circuit and refiled their state law claims in the Superior Court of the State of
California for the County of Los Angeles. (See Paragraph 3 of Item 3 of Unocal's
amended  Annual  Report on Form  10-K/A for the fiscal year ended  December  31,
2001, and Paragraph 1 of Item 1 of Part II of its Quarterly  Report on Form 10-Q
for the quarterly period ended June 30, 2002.)

On  September  18,  2002,  a  three-judge  panel of the Circuit  Court issued an
opinion that reversed in part and affirmed in part the District  Court's  ruling
and remanded the case for further proceedings in the District Court. The Circuit
Court  held  that,  if proved at  trial,  the  alleged  conduct  of the  Myanmar
military,  consisting  of  alleged  forced  labor and  certain  alleged  related
violence,  would constitute violations of international law actionable under the
Alien Tort Claims Act (28 U.S.C.  section 1350).  The Circuit Court further held
that  international  law  concerning  the  standard  for "aiding  and  abetting"
liability  applies to the  plaintiffs'  claims  against  the  Company  and found
sufficient  disputed facts to warrant a trial. With respect to other claims, the
Circuit Court affirmed the District Court's dismissal of the plaintiffs'  claims
under the Racketeer  Influenced and Corrupt  Organizations Act and also affirmed
the District Court's ruling that there was  insufficient  evidence to permit the
plaintiffs' claims for torture to proceed.

The  Company is  considering  whether  to pursue  additional  appellate  options
concerning  the  Circuit   Court's   decision,   including  the  possibility  of
petitioning for a rehearing and/or requesting a hearing by an "en banc" panel of
the Circuit  Court and the  possibility  of seeking  review by the U. S. Supreme
Court.  Barring  further action by the Circuit Court or the Supreme  Court,  the
cases will be remanded to the District Court for further  proceedings  under the
standard  adopted in the  Circuit  Court's  opinion.  Under that  standard,  the
plaintiffs  will be required to prove that the Company  "aided and  abetted" the
Myanmar  military's  alleged  wrongful  acts  by  providing  "knowing  practical
assistance or  encouragement"  for such acts that had "a substantial  effect" on
them. The Company strongly disputes that it engaged in such conduct, and intends
to defend  vigorously  against  the  plaintiffs'  claims in the  District  Court
through trial.

In August 2002, the California  Superior Court denied the Doe plaintiffs' motion
for class  certification  of their action in that court and set a February  2003
trial date for both of the Doe and Roe state court actions. The California court
has not yet considered what effect, if any, the Circuit Court's opinion may have
on the state court proceedings.

The Company  believes that the outcomes of both the federal and California cases
are not  likely to have a material  adverse  effect on the  Company's  financial
condition or liquidity or, based on  management's  current  assessment of the
cases, the Company's results of operations.

                                      -2-




Pursuant to the requirements of the Securities Exchange Act of 1934, the
registrant has duly caused this report to be signed on its behalf by the
undersigned, thereunto duly authorized.



                                           UNOCAL CORPORATION
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                                           (Registrant)




Date:  September 20, 2002                  By: /s/ JOHN A. BRIFFETT
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                                           John A. Briffett
                                           Assistant Comptroller


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