From chemistry-request _-at-_)www.ccl.net  Thu Aug 20 13:10:34 1998
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To: chemistry%!at!%www.ccl.net
From: Inge Muszynski <inge.muszynski |-at-| uni-tuebingen.de>
Subject: lone-pair-orientation in Furan




Dear CCL'lers,

I have got a question concerning the lone-pair-orientation of the oxygen in
Furan or in other 5-cycled heteroaromatic systems like 1,3,4-Thiadiazol etc.

Due to the planar character of Furan I would suppose a sp2-hybridisation for
the oxygen and an in-plane-orientation for its lone-pair. Surprisingly I
have found  an 0sp3 for Furan in the fragmental library of my molecular
modelling software SYBYL.

How to think about this?

Many thanks in advance.

Bye Inge Muszynski