Disilazane, hexamethyl compound with

Disilazane, hexamethyl-, 6 56 compound with boron trifluoride, 5 58... 

FaB Boron fluoride, 1 21, 23 compound with hexamethyl-disilazane, 6 58... 

Si(CH3)sH Silane, trimethyl-, halo derivatives, 6 61 SilCHalaNHCeHs Silane, trimethyl (anilino)-, 6 59 [Si(CH3)3]2NCH3 Disilazane, N-methylhexamethyl-, 6 58 [Si(CH3)3]2NH Disilazane, hexamethyl-, 6 56 compound with BF, 6 58... 

After considerable research, which examined a wide variety of different derivatives, trimethylsilylation has emerged as the procedure of popular choice for steroid and steroidlike compounds. Pure compounds or biological extracts containing 3 (3-hydroxyl groups can be readily silylated by treatment with A,G-bis-trimethylsilyltrifluoro-acetamide containing 1 % trimethylchlorosilane at 60°C for 30 min, with or without added pyridine. A,G-bis-tri-methylsilyltrifluoroacetamide, under some circumstances, can also be used alone or with a mixture of hexamethyl-disilazane and trimethylchlorosilane (10 10 5 v/v/v) at 60°C for 30-60 min. The trimethylsilyl derivatives separate well on capillary columns carrying apolar stationary phases. The derivatives also provide excellent electron-impact mass spectra. 

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