1Makin S M ; Kruglikova,R I Popova, T P; et al.Chemistry of enol ethers LI Reaction of vinylsilyl ethers with formic acid orthoesters. Zh Org Khim.1981,17(4):723-727(Russ).
2Jasjit Singh Watia and Amris Singh Watia. New syntheses of β, β-dimethoxy esters and setones by comjugate addition of methanol to some activated of methanol to some activated alkynes. J Org Chem, Vol.41,No.23, 1976:3765-6.
3Lennon H Mckendry, Midland,Mich. Preparation of substituted 1,2,4-Tfiazolo [1,5-a]pyfimidine-2-sulfonanilides[P]. US4910306,1990.
4Little Jack C,Thibos Patricia A, Kidisti Mariam G et al. Preparation of 5-amino-l,2,4-triazole-3-sulfonamides and intermediates[P]. EP 375061,1990-06-27.
5Kay K Kim;Richard C Krauss. Aqueaus process for the preparation of 5-methyl-N-(aryl)-1,2,4-triazolo(1,5-a)pyrimidine-2-sulfonamides[P]. US4988812,1991.
6Nishihira; Keigo; Tanaka; Shuji;etal. Method of preparing sodium formyl acetone and 4,4-dimethoxy 2-butanone[P]. US5276200,1994.
7William T M, Concord C. Novel sulfonamides andmethod of making[P]. US:4 734 123,1988.
8Kleschik W A,Ehr R J, Costales M J, et al. Substituted 1, 2, 4-triazole [ 1, 5-a ] pyrimidine-2-sulfonamides, compositions containing them, and their utility as herbicides [P]. US: 4 954 163,1990.
9Lennon H M,Midland M. Preparation of substituted1, 2, 4-Triazole [ 1, 5-a ] pyrimidine-2-sulfonanilides[P]. US:4 910 306,1990.
10Kleschik W A,Ehr R J,Costales M J,et al .Substituted 1,2,4-triazolo [1,5-a]pyrimidine-2-sulfonamides,compositions containing them ,and their utility as herbicides [P].US4954163,1990.
