Lactones ethylenecarboxylic

Lactones from ethylenecarboxylic acids Isolation of a fast-forming unstable lactone Rearrangement of lactones... [Pg.59]

Cyclic p,Y-ethylenecarboxylic acids from p-spiro-p-lactones Cyclobex-l-enylacetic acids... [Pg.16]

E)-y,5-Ethylenecarboxylic acid esters from 0x0 compds. via Y-sulfonyl-6-lactones G Synthesis with addition of four C-atoms... [Pg.57]

A soln. of diphenyl disulfide in 0.1 M tetra- -butylammonium bromide (as both mediator and electrolyte) in dichloromethane electrolysed under argon in a divided cell with platinum electrodes at a constant current of 0.02-0.03 A (current density 3 mA/cmO until 10 As of charge consumed, 0.5 eqs. 4-pentenol added, and electrolysis continued until reaction complete by g.c. or t.l.c. 2-(phenylthiomethyl)tetr hydro-furan. Y 72%. The method is inexpensive, less toxic than Se-based methodologies, and generally applicable to 5- and 6-membered O-heterocyclics reaction may also be achieved (preferably) by direct electrolysis with bis(4-methoxyphenyl) disulfide (having a much lower oxidation potential than diphenyl disulfide). F.e. and stereoselectivity, also 2-(aryIthio)lactones from ethylenecarboxylic adds, s. S. Toteberg-Kaulen, E. Steckhan, Tetrahedron 44, 4389-97 (1988). [Pg.111]

Hydroxy>j >lactones from, 7 -ethylenecarboxylic acids via j, -oxidocarboxylic acids... [Pg.71]

Syntheses with carbon monoxide Lactones from ethylenecarboxylic acid esters... [Pg.643]

Mercuric acetate sodium tetrahydridoborate Lactones from ethylenecarboxylic acids by oxymercuration-demercuration... [Pg.48]

Lactones and ethylenecarboxylic acid esters from ethylenecarboxylic acids... [Pg.80]

Hydroxycarboxylic from ethylenecarboxylic acids Hydroxyaldehydes from lactones... [Pg.58]

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