Bridged orthoesters

Yokoyama, Y. and Hall, H. K. Ring-Opening Polymerization of Atom-Bridged and Bond-Bridged Bicyclic Ethers, Acetals and Orthoesters. Vol. 42, pp. 107—138. [Pg.163]

Another example of displacement at C2 with fission of the anhydro bridge has been observed263 in the hydrolysis of the 3,5-diacetate ester of LXXXVII with dilute mineral acid. Aside from the expected spongouridine (XXXIII, R = H), uridine was obtained in appreciable yield. The production of uridine finds a ready explanation in the formation, in part, of an intermediate orthoester ion during the reaction, as a result of a nucleophilic... [Pg.352]

The review will be limited to atom- and bond-bridged bicyclic monomers. The important work of Bailey on the polymerization of spiro bicyclo orthoesters and spiro bicyclic orthocarbonates has been adequately described elsewhere 0 1 60 3. The outstanding and systematic body of work by Schu-erch2 3> and others on the ring opening polymerization of bicyclic acetals derived from carbohydrate precursors will also not be covered here. [Pg.107]

Ring-Opening Polymerization of Atom-Bridged and Bond-Bridged Bicyelie Ethers, Acetals and Orthoesters... [Pg.179]

The ring-opening polymerization of atom-bridged and bond-bridged bicyclic ethers, acetals, and orthoesters was reviewed by Yokoyama and Hall (104). [Pg.111]

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