Bob,
Well, the third dimension enters into this. This is one of those events
that hits randomly, and you have to work to set it up to analyze it.
If you take 2-butanone and line it up so the carbonyl is vertical, the
event becomes likely. When the event hits under these conditions,
tilting the model forward or backward slightly so that the carbonyl
stays in the YZ plane does not fix the problem. If you break out of the
YZ plane, the bond will form.
Tom ran into this problem while he was building Re and Si face model
exercises. At first, I though it was related to the 5 bond carbon that
he was disposing with a single bond click to the carbonyl, but in trying
to recreate the problem, I realized I could create it with a 4 bond
carbon.
Otis
Otis Rothenberger
chemagic.com
On 12/6/2010 9:54 AM, Robert Hanson wrote:
Hmm. Probably a coding error. You mean when the bond is directly
vertical on the screen, right?
On Mon, Dec 6, 2010 at 12:44 AM, Otis Rothenberger
<osrot...@chemagic.com <mailto:osrot...@chemagic.com>> wrote:
Bob,
This is random modelkit event, but there is a pattern of sorts: When a
bond is parallel to the screen Y axis, it can sometimes be
impossible to
change bond order by clicking. With hover selection circles
active, you
can see that the selection is not being made. Rotating the model
slightly to destroy the parallel alignment solves the problem. A
carbonyl group seems more susceptible to this than other bonds.
This is obviously not a huge problem, but if anything comes to
mind, let
me know.
Otis
--
Otis Rothenberger
chemagic.com <http://chemagic.com>
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Robert M. Hanson
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St. Olaf College
1520 St. Olaf Ave.
Northfield, MN 55057
http://www.stolaf.edu/people/hansonr
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
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