The highest single-move Scrabble scores have utilized the word BENZOXYCAMPHORS, and it seems unlikely much improvement will be made without a new base-word. In the February 1974 Word Ways there appears a 2037-point solution devised by Josefa Heifetz, which uses the term SESQUIOXIDIZING. Unfortunately this word does not appear in any dictionary, and no one has been able to find a substantive citation in another reference. However, the Oxford English Dictionary lists 'sesquioxidized' as a past participle, which surely implies the existence of a verb 'sesquioxidize'.
Word Ways: Vol. 12
, Article 10.
Available at: http://digitalcommons.butler.edu/wordways/vol12/iss4/10