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- W4252872015 abstract "This chapter provides information on five-membered ring systems with O & S (Se, Te) atoms. The chapter presents a discussion on (1) 1,3-dioxoles and dioxolanes; (2) 1,3-dithioles and dithiolanes; (3) 1,3-oxathioles and oxathiolanes; (4) 1,2-dithioles and dithiolanes; and (5) three or four heteroatoms. New methods for hydrolysis of 2,2-dimethyl-l,3-dioxolanes include ceric ammonium nitrate and oxalic acid in acetonitrile and a polymer-supported dicyanoketene acetal. Asymmetric Lewis acid mediated enantioselective ring opening of meso 1,3-dioxolanes has been examined as a method for desymmetrisation of meso 1,2-diols and MeLi and MezCuLi are reported to give opposite stereoselectivity. New catalysts for the reaction of aldehydes and ketones with ethane-l,2-dithiol to form dithiolanes include iodine in tetrahydrofuran (THF) and iodine supported on neutral alumina. Selective reaction of aldehydes in the presence of ketones is possible using either indium trichloride or “trichloroisocyanuric acid” (1,3,5-trichlorohexahydro-1,3,5-triazine-2,4,6-trione). The competition between dehydrogenation and formation of 1,2,4-trioxolanes upon ozonolysis of 1,4-cyclohexadienes and their mono epoxides has been examined." @default.
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- W4252872015 date "2002-01-01" @default.
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- W4252872015 title "Chapter 5.6 Five-membered ring systems: With O & S (Se, Te) atoms" @default.
- W4252872015 doi "https://doi.org/10.1016/s0959-6380(02)80012-5" @default.
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