This was a bug in the UFF calculation setup. It was just assigning the wrong set of parameters to carbocations and carbanions.

It's fixed and uploaded to

There should be no need for a boron work-around.


On Tue, Apr 27, 2010 at 7:31 AM, Christopher Masi <> wrote:
2-propyl cation gives me a planar carbocation.
Safari 4.0.5, Mac OS X 10.6.3
I forgot to do this last night at home. I have some older Macs I can test it on tonight.

On Apr 26, 2010, at 9:24 PM, Philip Bays wrote:

> I see the flat structure with the  t-butyl cation.
> On Apr 25, 2010, at 10:06 PM, Otis Rothenberger wrote:
>> This is a request for a Mac user test of a page. I'm trying to create
>> the appearance of a JME to Jmol loading of a planar carbocation.
>> Admittedly, this is a work around, but it's a work around of UFF not
>> Jmol. The following works on Windows (MSIE, Firefox, and Chrome), but
>> apparently there are Mac issues:
>> On
>> 1) Click Display Molecular Editor.
>> 2) On the subsequent control screen click Draw.
>> 3) Draw a simple carbocation - e.g. 2-propyl cation.
>> 4) Click Load Model.
>> On Windows, I consistently see a planar carbocation. On Mac, I have a
>> problem report.

Robert M. Hanson
Professor of Chemistry
St. Olaf College
1520 St. Olaf Ave.
Northfield, MN 55057
phone: 507-786-3107

If nature does not answer first what we want,
it is better to take what answer we get.

-- Josiah Willard Gibbs, Lecture XXX, Monday, February 5, 1900