<div>Yes,</div> <div> </div> <div>It is highly possible because tetrasubstituted double bond is much more difficult to be reduced. The pressure of hydrogen and the load of Pd catalyst could play the trick.</div> <div> </div> <div>Good luck!</div> <div><A href="http://www.ecompound.com">www.ecompound.com</A><BR><BR><B><I>Jeff Li <arnombas@yahoo.com.cn></I></B> wrote:</div> <BLOCKQUOTE class=replbq style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #1010ff 2px solid"> <DIV>hi folks:</DIV> <DIV> </DIV> <DIV>Is it possible to selectively hydrogenate a di-substituted alkenyl part over a tetrasubstituted alkenyl part in a same molecule (or a same macrolide ring), using palladium catalyst, like Pd-C?</DIV> <DIV> </DIV> <DIV>Thanks!!</DIV> <DIV> </DIV> <DIV> </DIV> <div> <HR SIZE=1> <A href="http://cn.mail.yahoo.com/" target=blank>ÇÀ×¢ÑÅ»¢Ãâ·ÑÓÊÏä-3.5GÈÝÁ¿£¬20M¸½¼þ£¡</A>
_______________________________________________<BR>ORGLIST - Organic Chemistry Mailing List<BR>Website / Archive / FAQ: http://www.orglist.net<BR>To post a message (TO EVERYBODY) send to everybody@orglist.net<BR>To unsubscribe, send to everybody-request@orglist.net the message: unsubscribe your_orglist_password your_address</BLOCKQUOTE><BR><p> 
<hr size=1>Get your email and more, right on the <a href="http://us.rd.yahoo.com/evt=42973/*http://www.yahoo.com/preview"> new Yahoo.com</a>