in perdeuterocyclohexane byproducts: thiophene; Irradiation (UV/VIS); degassing of soln. of (η5-C4H4Se)Cr(CO)3 in C6D12; mixing with 1 atmof CO; monitoring by NMR; irradn. (λ > 340 nm for 50 min at room temp.; monitoring by NMR; removal of solvent under reduced pressure, dissolvingin pentane; monitoring by IR;

in cyclohexane Irradiation (UV/VIS); irradn. (λ = 355 nm) of CO-satd. soln. of (η5-C4H4Se)Cr(CO)3 in cyclohexane at room temp.; monitoring by IR;

LDA; n-BuLi in tetrahydrofuran N2-atmosphere; stirring (-50°C, 10 min), n-BuLi addn. (-90°C), stirring (-50°C, 10 min), Mn-complex soln. addn. (-90°C); evapn. (vac., -20°C), chromy. (SiO2);