Soc., 1940, 62, 2405 and Preparation of Intermediates Section), 7,8,9,10-tetrahydro-6-oxo-6H-dibenzo[b,d]pyran intermediates of formula 2 ##STR3## (where R is as described above for 1) are reacted with various commercially available alcohols or phenols in an inert solvent in the presence of a base such as sodium hydroxide.