in dichloromethane 40 h; Ambient temperature;

in dichloromethane mixt. of organotin compd. and LTA in dry CH2Cl2 stirred at room temp. under N2 for 40 h; quenching with saturated ammonium chloride soln., aq. phase is removed, extd. with chloroform, combd. organic phases are dried, concg., silica gel column chromy. (hexane-chloroform), IR, NMR, MS;

in dichloromethane mixt. of organotin compd. and LTA in dry CH2Cl2 stirred at room temp. under N2 for 40 h; quenching with saturated ammonium chloride soln., aq. phase is removed, extd. with chloroform, combd. organic phases are dried, concg., silica gel column chromy. (hexane-chloroform), IR, NMR, MS;

in dichloromethane mixt. of organotin compd. and LTA in dry CH2Cl2 stirred at room temp. under N2 for 40 h; quenching with saturated ammonium chloride soln., aq. phase is removed, extd. with chloroform, combd. organic phases are dried, concg., silica gel column chromy. (hexane-chloroform), IR, NMR, MS;

boron trifluoride diethyl etherate in dichloromethane; water