sodium hydride in dimethyl sulfoxide T=55°C;

nickel in ethylene glycol dimethyl ether T=85°C; 0.25 h;

in acetonitrile T=20°C; 5 h; Inert atmospherePhotolysis;

in acetonitrile Ambient temperatureIrradiation; Yield given. Yields of byproduct given;

sodium hydroxide in methanol; water T=55°C; competitive inter- and intramolecular rearrangements; high reaction intramolecularity; various conditions (solvents, temperatures); a series of acyl stabilised ammonium ylides are investigated in similar manner; Product distributionMechanism;