lone-pair-orientation in Furan
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