different between stereoselectivity vs stereoselectively

English

stereo- +? selectivity

stereoselectivity (countable and uncountable, plural stereoselectivities)

(chemistry) The condition of being stereoselective or a measure of the extent to which a reaction is stereoselective
Aldrichimica Acta Volume 30 No 4 (pdf) from Sigma-Aldrich
The stereoselectivity that occurs in these vinylcarbenoid cyclopropanations results in a strong preference for the formation of cis-divinylcyclopropanes.

stereoselective +? -ly

stereoselectively (not comparable)

In a stereoselective manner; through the use of stereoselectivity.
Aldrichimica Acta Volume 30 No 4 (pdf) from Sigma-Aldrich
Reaction of DAPC 54 with 4 again occurred stereoselectively at the cyclobutene-1,2-diester moiety to produce 56

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