NiCl2[(-)-DIOP], 41677-72-9; NiCl2, 7718-54-9; (Z)-/3-bromostyrene, 588-73-8; (1 -chloroethy 1)trichlorosilane, 7787-82-8; cro-tonaldehyde, 4170-30-3; (S)-l-phenyl-l-(trifluorosilyl)propane, 103980-93-4; (S)-1 -phenyl-1 -(trifluorosilyl)butane, 103980-94-5; 1 -(trimethylsilyl)ethyl chloride, 7787-87-3; l-(dimethylphenylsilyl)ethyl chloride, 17877-00-8; 1-(triethylsilyl)ethyl chloride, 18279-74-8; l-(triphenylsilyl)ethyl chloride, 103981-16-4; l-(trichlorosilyl)ethyl chloride, 7787-82-8; 1 -(phenyldichlorosilyl)ethyl chloride, 18236-52-7; trimethylacetaldehyde, 630-19-3. Supplementary Material Available: Preparation of 1-(trimethylsilyl)ethyl chloride, l-(dimethylphenylsilyl)ethyl chloride, 1 -(triethylsily 1)ethyl chloride, and 1 -(triphenylsilyl)ethyl chloride (2 pages). Ordering information is given on any current masthead page.

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NotesFrom a synthetic point of view methanolysis of 1 (and likely similar unimolecular solvolyses) appears to be of limited usefulness. Solvolysis of 1 and 2 in aprotic solvents in the presence of strong nucleophiles should conversely represent a good alternative to the displacement of analogous 21-chloro derivatives lg2 and 2c5 for the introduction of substituents at C-21. Experimental Section617a-Pregna-5,20-dien-3/S,17-diol 3-Acetate 17-Trifluoroacetate (1). A solution of 17a-pregna-5,20-dien-3/3,17-diol 3-acetate (la)2 (0.36 g, 1 mmol) in pyridine (1.7 mL) was treated with trifluoroacetic anhydride (0.7 mL) at 0 °C for 15 min. Then cold 1 N HC1 (11.7 mL) was added and the mixture was extracted with ether. The ether layers were washed to neutrality with cold water, dried (Na2S04), and evaporated. The residue (0.45 g) was crystallized from n-hexane (0.33

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Trimethylbi?ret (I) und Iß‐Dimethylharnstoff(VI) reagieren in Gegenwart von Chloroform zu Triazinderivaten (II)‐(IV) sowie zu Dichlormethan (V).