<P>
&nbsp; <BR>
please try p-toluene sulphonic acid in amount of 1:0.2 mol<BR>
<BR>
Sincerely,<BR>
Hardik<BR>
<BR>
On Thu, 13 Oct 2005 William Chien wrote :<BR>
&gt;Several years ago, I was trying to make a diol (of<BR>
&gt;Trimethylolpropane)protecting group by using dimethyl<BR>
&gt;ketone and found the resulting material wasn't very<BR>
&gt;stable.<BR>
&gt;<BR>
&gt;Recently I found an article regarding a similar<BR>
&gt;reaction (Glycerol with Ketone and acidic catalyst).<BR>
&gt;<BR>
&gt;I am looking for the type of catalyst suitable for<BR>
&gt;this reaction and the reaction condition to stabilise<BR>
&gt;the resulting compound.<BR>
&gt;<BR>
&gt;Thanks and best regards<BR>
&gt;<BR>
&gt;William<BR>
&gt;<BR>
&gt;<BR>
&gt;<BR>
&gt;__________________________________<BR>
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