<SUBMISSION>
<ACCESSION-NUMBER>0001140361-09-018745
<TYPE>8-K
<PUBLIC-DOCUMENT-COUNT>1
<PERIOD>20090807
<ITEMS>5.02
<FILING-DATE>20090812
<DATE-OF-FILING-DATE-CHANGE>20090812
<FILER>
<COMPANY-DATA>
<CONFORMED-NAME>CLEAN DIESEL TECHNOLOGIES INC
<CIK>0000949428
<ASSIGNED-SIC>2810
<IRS-NUMBER>061393453
<STATE-OF-INCORPORATION>DE
<FISCAL-YEAR-END>1231
</COMPANY-DATA>
<FILING-VALUES>
<FORM-TYPE>8-K
<ACT>34
<FILE-NUMBER>001-33710
<FILM-NUMBER>091006661
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<BUSINESS-ADDRESS>
<STREET1>10 MIDDLE STREET
<STREET2>SUITE 1100
<CITY>BRIDGEPORT
<STATE>CT
<ZIP>06604
<PHONE>2034165290
</BUSINESS-ADDRESS>
<MAIL-ADDRESS>
<STREET1>10 MIDDLE STREET
<STREET2>SUITE 1100
<CITY>BRIDGEPORT
<STATE>CT
<ZIP>06604
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<DOCUMENT>
<TYPE>8-K
<SEQUENCE>1
<FILENAME>form8k.htm
<DESCRIPTION>CLEAN DIESEL TECHNOLOGIES 8-K 8-7-2009
<TEXT>
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<div style="TEXT-ALIGN: center"><font style="DISPLAY: inline; FONT-SIZE: 14pt; FONT-FAMILY: Times New Roman">UNITED STATES</font></div>
<div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 14pt; FONT-FAMILY: Times New Roman">SECURITIES AND EXCHANGE COMMISSION</font></div>
<div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 12pt; FONT-FAMILY: Times New Roman">Washington, D.C.&#160;&#160;20549</font></div>
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<div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-WEIGHT: bold; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">CURRENT REPORT</font></div>
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<div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-WEIGHT: bold; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Pursuant to Section 13 or 15(d) of the</font></div>
<div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-WEIGHT: bold; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Securities Exchange Act of 1934</font></div>
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<div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Date of Report (Date of earliest event reported):&#160;&#160;August 7, 2009</font></div>
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<div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-WEIGHT: bold; FONT-SIZE: 24pt; FONT-FAMILY: times new roman">CLEAN DIESEL TECHNOLOGIES, INC.</font></div></td></tr><tr>
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<div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-WEIGHT: bold; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">Suite 1100, 10 Middle Street, Bridgeport, CT</font></div></td>
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<div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">Registrant's telephone number including area code:</font></div></td>
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<div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:</font></div>
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<div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><font style="DISPLAY: inline; FONT-WEIGHT: bold">Item 5.02&#160;&#160;Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensation Arrangements of Certain Officers</font>.</font></div>
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<div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Effective August 7, 2009, pursuant to a general restructuring and reduction in force of the Registrant, the Board of Directors of the Registrant eliminated the position of Chief Technology Officer and, with regret, terminated the employment of Dr. Walter G. Copan, formerly Executive Vice President and Chief Technology Officer.</font></div>
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<div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Pursuant to the terms of Dr. Copan&#8217;s Employment Agreement as of June 14, 2005 (Exhibit 99.1 to this Report on Form 8-K), Dr. Copan is entitled to salary continuation at the rate of $18,750 monthly and benefits for up to one year. Also, pursuant to the terms of outstanding stock option agreements, Dr. Copan may acquire for up to two years
61,333 shares of the Registrant&#8217;s common stock at exercise prices ranging from $2.705 to $19.125.</font></div>
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<div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 54pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">99.1&#160;&#160;Employment Agreement of Walter G. Copan dated as of June 14, 2005 filed as Exhibit 99.1 to Registrant&#8217;s Form 8-K of August 3, 2005 and incorporated by reference herein.</font></div>
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<div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="center"><font style="DISPLAY: inline; FONT-WEIGHT: bold; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman"><font style="DISPLAY: inline; TEXT-DECORATION: underline">SIGNATURES</font></font></div>
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<div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 36pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">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 hereunto duly authorized.</font></div>
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<div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">Charles W. Grinnell</font></div></td>
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<div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: times new roman">Its:&#160;&#160;Secretary</font></div></td>
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<div style="DISPLAY: block; MARGIN-LEFT: 0pt; TEXT-INDENT: 0pt; MARGIN-RIGHT: 0pt" align="left"><font style="DISPLAY: inline; FONT-SIZE: 10pt; FONT-FAMILY: Times New Roman">Dated:&#160;&#160;August 12, 2009</font></div>
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