"whereas not" is correct and can be used in written English.
You can use it to express a contrast between two ideas or to emphasize that something is not the case. For example, "She usually likes to go to the beach, whereas not her brother."
Whereas not re-purified LPS strongly increased EC numbers (Fig. S1), ultra pure LPS exerted significant but relatively weak effect on EC proliferation (Fig. 3A).
Hence, not having music actually closes that option, whereas not having geography does not.
Today I can carry on living for very many years, whereas not long ago the very diagnosis would have indicated a short survival time.
Overeem started off looking great but slowed himself down whereas not to empty the proverbial "gas tank".
Every polytope is a polyhedron, whereas not every polyhedron is a polytope.
Forest fragmentation increased in the wetland landscape, whereas not much change was observed in the forest landscape.
The resulting ΔδF value was large in the case of 2-butyl ester of FICA (5a), whereas not detectable in the case of the corresponding MTPA ester (6a).
Indeed, it has lost more than 100 soldiers since 1990, whereas not one single Japanese soldier has been killed (in combat operations overseas) during the same time-frame.
The results show the GNPs are taken into the living cell and enveloped into some vesicles named 'lick up vesicles' in the cytoplasm whereas not into the nucleus.
Using the charging station, 40%% of the women stated a very positive handling experience, whereas not even 20%% of the men stated the same.
However, our results show that in some cases, the tri-dimensional transmission is null, whereas not all bilateral transmissions are null.
