This paper describes procedures using enzyme-catalyzed and conventional chemical steps for the preparation of unusual sugars. We have described previously the use of aldol condensations catalyzed by aldolase (EC 4.1. 2.13, from rabbit muscle) as a route to isotopically labeled glucose 6-phosphate and fructose 6-phosphak3 The work reported here uses aldolase in analogous preparations of 6-deoxyhexoses and 6, 7-dideoxyheptoses ...