u2550 c cooh and a hydroxy ester or acid of the formula r chc coor 3 the mixture is then contacted with an esterifying agent to convert the acids to esters the ester mixture is contacted with a dehydrating agent to convert the hydroxy ester to unsaturated ester of the formula r ch u2550 c coor 3 the unsaturated ester is contacted with a basic catalyst to cyclize it to the cyclic dione ester of the formula str2 and this ester is then hydrolyzed and decarboxylated to give the product str3 wherein r is selected e g from alkylthio alkythioalkyl cycloalkyl alkyl substituted cycloalkyl alkoxy alkanoyloxy alkoxycarbonyl aryl substituted aryl heterocyclic or substituted heterocyclic wherein each group or moiety has up to 20 carbons and r 1 r 2 and r 3 are each selected e g from alkyl or cycloalkyl of up to 20 carbons and r 2 and r 3 can also be hydrogen application_number US 39979089 A description in accordance with the present invention there are provided novel compositions of matter comprising polyester material having the repeating unit of the formula r is selected from alkylthio alkylthioalkyl cycloalkyl alkyl substituted cycloalkyl alkoxy alkanoyloxy alkoxycarbonyl aryl substituted aryl heterocyclic or substituted heterocyclic wherein the alkyl groups or moieties have 1 to 20 carbons and r 1 and r 2 are each selected from hydrogen alkyl of 1 to 20 carbons or cycloalkyl in accordance with a particular embodiment of the present invention there is provided a process for preparing the above described polyester material comprising reacting an aldehyde of the formula r cho with a.