1Gresham W F. Preparation of poly functional compounds: US, 03055016 [P]. 1948-10-16.
2Zehner L R, Lenton W R. Process for the preparation of ethylene glycol: US, 05/715747[P]. 1976-08-18.
3Tawara S, Fujii K, Nishihira K, et al. Continuous process for continuously preparing ethylene glycol: EP, 81106636. 4[P]. 1981-08-26.
4Yamazaki T, Eguchi M, Uchiumi S, et al. Process for preparing dialkyl oxalates: US, 05/560829[P]. 1975-03-21.
5Zehner L R. Preparation of oxalate esters from carbon monoxide and an alkoxycycloalkene: US, 05/734799 [P]. 1976-10-22.
6Miyazaki H,Shiomi Y, Fujitus S, et al. Process for preparation of oxalic acid diesters: JP, 19810007910[P]. 1981-01-23.
7Gaffney A M, Sofranko J A. Preparation of dialkyl oxalates using a heterogeneous Pd-V-P catalyst for the oxidative carbonylation of alcohols: US, 06/397752[P]. 1982-07-13.
8Ream B C, Henry. J P, Kapieak L A. Process for preparing a diester of oxalic acid: US, 06/428816[P]. 1982-09-30.