in hexane under Ar, Ti complex (0.706 mmol) dissolved in hexane (10 ml), N,N-bis(trimethylsilyl)sulfurdiimide added, mixt. stirred at 50°C for 5 d; amount of solvent reduced at 0°C, distilled at 70°C and 0.1 mbar to reveal 1,2,3,4-tetramethylfulvene, n-hexane, bis(trimethylsilyl)acetylene, and N,N'-bis(trimethylsilyl)sulfurdiimide, solid dissolved in n-hexane, stored at -78°C;

in dichloromethane 48 h; Ambient temperature;

in pentane under N2, borane layered with diimide, stirred for 15 h; removal of volatiles in vac., taken up in pentane, filtered, evapd., cooled to -30°C,; elem. anal.;

in pentane under N2, dropwise addn. within 2 h of borane in pentane at 0°C to a stirred soln. of diimide in pentane, stirred overnight; removal of volatiles in vac., taken up in pentane, filtered, removal of solvent in vac.; elem. anal.;

in dichloromethane -30°C;