n-butyllithium in tetrahydrofuran; hexane to a stirred soln. of phosphonium-compd. in THF at 0°C is added a soln. of BuLi in hexane under N2, the mixt. is stirred at room temp. for 1 h and recooled to 0°C, addn. of Sn-compd. and the mixt. is stirred for 12 h, addn. of aq. NH4Cl; extraction with light petroleum, the extract is dried (MgSO4) and evaporated under reduced pressure, purifn. by column chromy. on silica gel (elution with pentane);

ammonium chloride in tetrahydrofuran; hexane; water (Ar); stirring (2 h, 0°C), quenching with aq. NH4Cl, treatment with H2SO4; Et2O addn., stirring (3 h), organic layer concn. (vac.), flash chromy. (silica, Et2O-hexane gradient);

in diethyl ether aldehyde soln. adding dropwise to a soln. of Bu3SnMgCl, refluxing for 2 h, hydrolyzing with satd. NH4Cl, org. phase sepg. under inert atm., drying, solvent evapg.; purified by distn. in vacuo; identified by IR, UV and NMR spectra;

in not given