1: 49 percent / molecular sieve / diethyl ether / 3 h / Ambient temperature 2: 36 percent / CH2Cl2; diethyl ether / 1.) 8 d, room temp.; 2.) 1 d, reflux View Scheme

1: 49 percent / molecular sieve / diethyl ether / 3 h / Ambient temperature 2: 36 percent / CH2Cl2; diethyl ether / 1.) 8 d, room temp.; 2.) 1 d, reflux View Scheme

in diethyl ether; dichloromethane 1.) 8 d, room temp.; 2.) 1 d, reflux;