It was used in the preparation of:3-carbomethoxy-4- oxotetrahydrothiopyran, 2- and 4-carbomethoxy-3-oxotetrahydrothiophene，methyl thioglycolate and aminoethanethiol conjμgated gold nanorods. It was used in the preparation of:3-carbomethoxy-4- oxotetrahydrothiopyran, 2- and 4-carbomethoxy-3-oxotetrahydrothiophene，methyl thioglycolate and aminoethanethiol conjugated gold nanorods.